CN1161618A - Video signal recording apparatus and video signal recording and reproducing apparatus - Google Patents

Video signal recording apparatus and video signal recording and reproducing apparatus Download PDF

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Publication number
CN1161618A
CN1161618A CN 95121672 CN95121672A CN1161618A CN 1161618 A CN1161618 A CN 1161618A CN 95121672 CN95121672 CN 95121672 CN 95121672 A CN95121672 A CN 95121672A CN 1161618 A CN1161618 A CN 1161618A
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signal
digital information
information signal
tape
record
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尼田信孝
尾鹫仁朗
野口敬治
熊坂登行
座间秀夫
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Hitachi Ltd
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Hitachi Ltd
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Abstract

An apparatus for recording and reproducing a digital video signal on and from a common recording medium by using the head configuration common to the conventional one while maintaining exchangeability with the current analog VTR. An analog video and audio signals are recorded and reproduced on and from an video track and an underlying deep-layer track, respectively, by means of magnetic heads and magnetic heads. On the other hand, a digital video and audio signal is recorded and reproduced on and from two adjacent tracks by means of the magnetic heads for analog audio recording. During reproduction, an identification signal generating circuit generates an identification signal for discriminating a recorded signal, and a control signal is PWM modulated with the identification signal and recorded on a control track by means of a magnetic head.

Description

Video signal recording apparatus and video signal recording and replay device
The present invention relates to a kind of magnetic recording and replay device of digital video signal, relate in particular to a kind of can with the video signal recording and the replay device of existing simulation VIR function of exchange.
At present, a kind ofly use 1/2 foot wide analogue type VTR to use as home-use video signal recording and replay device with an oxide layer tape.
On the other hand, the practice that hope becomes the digital broadcasting of TV broadcasting of future generation has had raising, in the U.S., existing a kind of ATV (Advanced Television) standard, under this standard, its wide-band video signal is than having higher resolution through the high-efficiency digital compressed encoding and vision signal (SD (standard definition) signal hereinafter referred to as) that propagate with the 6HZ bandwidth identical with existing TV broadcast system band bandwidth in existing TSC-system or the Phase Alternation Line system.In addition, also have a known system, under this system, the SD vision signal with a MPEG (mobile motion picture expert group version) system carry out the high-efficiency digital compressed encoding and via satellite or coaxial cable broadcast.
Above-mentioned digit broadcasting system is at Nippon Television technical research magazine the 47th volume, and 1993 the 4th phases, the 486th～503 page has argumentation in detail.
Can imagine that digital TV broadcasting will come into operation in the near future, and will exist simultaneously with analog TV broadcasting.A digital video signal also keeps the complete of digital signal simultaneously but general analog vtr can not write down and reset.
One object of the present invention, provide a kind of video signal recording apparatus and a kind of can with the video signal recording and the replay device of existing analog vtr function of exchange, and this device can write down and reset as being used for digital TV broadcasting and keeping the complete of digital signal simultaneously through the video and audio signal of digital compression coding.
For achieving the above object, according to the present invention, comprise in a video signal recording and replay device: the first magnetic head group is used on video track record and from the video track analog video signal of resetting; Also comprise the second magnetic head group, be used at the bottom of video track record with from the bottom playback simulated audio signal of video track; And a servo circuit is used to control the rotation of magnetic drum and the transmission of tape; And the digital record signal processing apparatus is provided, be used to carry out the form and the channel coding (modulation) of a digital video signal; With the analog/digital choice device, be used to select an analog video signal or a digital video signal as tracer signal; The analog/digital identification device is used to determine that the signal that is recorded is analog video signal or digital video signal; Also have digital signal processing device, be used for demodulation playback digital video signal and execution and go format to handle as error correction, thus, the metal head in narrow gap is come the record and the playback of combine digital vision signal as the second magnetic head group by the second magnetic head group.
In video signal recording of the present invention and replay device, also provide: the 3rd magnetic head group, special-purpose with digital signal transmission bit rate record and playback digital video signal; Be used to write down and the device of the identification signal of resetting, identification signal is used for analog-and digital-discriminating.
Under the analog record situation, audio signal is by the second magnetic head group record, during record, because what the second magnetic head group was used is metal head, even so under narrow gap, record also can reach the bottom of magnetosphere, and even when analog video signal of the top layer of magnetosphere regenerative recording, effectively replay operations still can guarantee.
On the other hand, for example, the additional self-correcting code of digital video signal becomes block and channel coding (modulation) by digital record signal processing apparatus format analysis processing, and by the second magnetic head group or the second and the 3rd magnetic head group record on the scroll track that forms on the incline direction of tape.In said process, input digital video signal after time domain is handled, can not considered the transmission bit rate of input digital video signal with constant in fact record bit rate record in the digital record signal processing apparatus.Servo circuit make rotary head drum with the corresponding substantially invariable velocity of rotation rotation of record bit rate, and control the tape running speed of tape according to the transmission bit rate of supplied with digital signal.The signal that expression is recorded be digital video signal identification signal by along the tape longitudinal recording on the so-called linear track of tape.
In playback procedure, analog/digital recognition device detection record on linear track identification signal and determine that the signal that is recorded is an analog video signal or a digital video signal.Then, the digital video signal of playback carries out such as separating the mediation correction processing through the digital replaying signal processing unit, makes original digital video signal restore.In this course,, short wavelength's record can be allowed, like this, the record and the playback of high quality image and vision signal can be realized according to gap length because the second magnetic head group is used narrow gap magnetic head.
Fig. 1 is an embodiment block diagram according to video signal recording of the present invention and replay device.
Shown in Figure 2 is the example of the record frequency spectrum of an analog video signal and a simulated audio signal.
Shown in Figure 3 is during an analog video signal and simulated audio signal record, the trace graphics on the tape.
Shown in Figure 4 is during a digital video and audio signal record, the trace graphics on the tape.
Shown in Figure 5 is the trace graphics of working as with tape playback time on common unit of digital form record.
Shown in Figure 6 is the example of a servo circuit structure.
Shown in Figure 7 is block diagram according to another embodiment of video signal recording of the present invention and replay device.
Shown in Figure 8 is the example of setting height(from bottom) that is used for the magnetic head of digital record.
Shown in Figure 9 is the timing example of magnetic drum rotation and digital record signal.
Shown in Figure 10 is another example of setting height(from bottom) that is used for the magnetic head of digital record.
Shown in Figure 11 is another timing example of magnetic drum rotation and digital record signal.
Shown in Figure 12 is magnetic head configuration figure according to another embodiment of video signal recording of the present invention and replay device.
Shown in Figure 13 is another example that is used for the magnetic head setting height(from bottom) of digital record.
Shown in Figure 14 is another timing example of magnetic drum rotation and digital record signal.
Shown in Figure 15 is another example of trace graphics during the digital signal record.
Shown in Figure 16 is magnetic head configuration figure according to another embodiment of video signal recording of the present invention and replay device.
Shown in Figure 17 is another example that is used for the magnetic head of digital record.
Shown in Figure 180 is magnetic head configuration figure according to another example of video signal recording of the present invention and replay device.
Shown in Figure 19 is another example again of setting height(from bottom) that is used for the magnetic head of digital record.
Shown in Figure 20 is another example again of the timing of magnetic drum rotation and digital record signal.
Shown in Figure 21 is another example of trace graphics during the digital signal record.
Case description the present invention with reference to the accompanying drawings.
Shown in Figure 1 is block diagram according to the embodiment of video signal recording of the present invention and replay device.In the drawings, parameter 1a, 1b, 2a, 2b and 4 represents magnetic head, and 5 represent magnetic drum, 6 represent tape, and 11,21 and 31 represent input, 12 represent an analog video tracer signal treatment circuit, and 22 represent an analogue audio frequency tracer signal treatment circuit, and 32 represent a digital tracer signal treatment circuit, 13,15,17,23,25,27 and 45 represent change over switch, 14,24 and 44 represent record amplifier, 16,26 and 46 represent playback amplifier, and 18 represent an analog video replay signal treatment circuit, 28 represent an analogue audio frequency replay signal treatment circuit, 38 represent a digital replaying signal treatment circuit, and 19,29 and 39 represent output, 41 represent a record servo circuit, on behalf of identification signal, 42 produce circuit, and 48 represent identification signal detection circuit, and 49 represent the playback system servo circuit, 51 representative simulations/numeral is selected circuit, 53 representative simulations/digital discriminator circuit.
The logging mode of analog video signal at first, is described.During writing down, change over switch 15,25 and 45 places the R end respectively
In the drawings, luminance signal part and carrier chrominance signal part by the analog video signal of input 11 input are modulated and down-conversion through FM respectively at analog video tracer signal treatment circuit 12, and the signal that obtains is superimposed converts analog video tracer signal SR1 to.On the other hand, all passing through FM at analogue audio frequency tracer signal treatment circuit 22 by the audio signal parts of a left side/right side of the simulated audio signal of input 21 input or two sound channels of master/pair modulates and will stack up through the signal that modulation obtains and become analogue audio frequency tracer signal SR2.(A) among Fig. 2 and (B) two parts provided the frequency band example of analog video tracer signal SR1 and analogue audio frequency tracer signal SR2 respectively.
When analog/digital selects circuit 51 to select analog video signal as tracer signal, select a control signal CR1 of circuit output to make change over switch 13 and 23 all switch to the A end by this, like this, analog video tracer signal SR1 and analogue audio frequency tracer signal SR2 offer magnetic head 1a through record amplifier 14 and 24 respectively, 1b and magnetic head 2a, 2b.Register system servo circuit 41 is adjusted to the first rotary speed R1 to the velocity of rotation R of rotary head drum 5, and the tape running speed V of tape 6 is adjusted to the first transmission speed V1.It should be noted that magnetic drum velocity of rotation R1 will be set to the frame frequency value of the analog video signal that is write down and equate.
Fig. 3 shows an example of recording geometry when the record analog video signal.At first, by magnetic head 2a and 2b analogue audio frequency tracer signal SR2 is recorded in and forms analogue audio frequency track 62a and 62b on the tape 6, its track width is TW2.Subsequently, by magnetic head 1a and 1b analog video signal is overlapped record on analogue audio frequency track 62a and the 62b, and form analog video track 61a and 61b, its track width is TW1.TP1 represents orbit interval.For example, when the cylinder diameter degree of rotary head drum 5 was 62mm, its rotary speed R1 was made as 30rps, equate with the frame frequency of analog video signal, and the tape running speed of tape 6 was 33.35mm/s that orbit interval TP1 is 58 μ m.In this case, the track width TW1 of analog video track 61a and 61b is 40～58 μ m, and the track width TW2 of analogue audio frequency track 62a and 62b is more than or equal to 20 μ m.When the frame frequency of analog video signal was 25HZ, magnetic drum velocity of rotation R1 was 25rps, and tape running speed V1 is 23.39mm/s, and orbit interval TP1 is 49 μ m.
Next, the digital video signal recording pattern is described.
Get back to Fig. 1 now, for example, when the signal that offers input 31 is according to the MPEC mode during through the digital video of efficient compressed encoding and audio signal, such digital video and audio signal are in digital record signal processing circuit 32 process format analysis processing, it comprises interlacing, the stack of error correction and synchronizing signal and format analysis processing are passed through channel coding (modulation) again and are converted into digital record signal SR3.
Here, if with the oxide tape the same with analog record as tape 6, then increase and manifest when high-effect when the coercivity of oxide tape, the record bit rate of digital record signal SR3 rises to about 20Mbps.In this case, both made owing to produce redundant code when carrying out format analysis processing in digital record signal processing circuit 32, the input signals bit rate reaches about 15Mbps, still can be maintained.On the other hand, be about 10Mbps according to the MPEG-2 mode through the transfer rate maximum of a SD video and audio signal of efficient compressed encoding, correspondingly, this digital SDTV signal is in the time of being recorded in analog record on the identical oxide tape.Like this, according to the following fact, promptly rely on advanced efficient video compress technique, digital video signal can be realized the present invention with a bandwidth record near analog video signal.
In addition, from above-mentioned example as can be seen, approximately the maximum input bit rate of 15Mbps is compared the surplus that 5Mbps is arranged with the actual input bit rate that is about 10Mbps, and this data surplus can be used to recording of trick play signal.
Now, when analog/digital selected circuit 51 to select digital video signal as tracer signal, this selected control signal CR1 of circuit output to make change over switch 23 receive the D end, and the digital record signal offers magnetic head 2a and 2b through record amplifier 25 like this.Simultaneously, control signal CR1 also receives change over switch 13 the D end, makes magnetic head 1a and 1b not receive any signal.Register system servo circuit 41 selects circuit 51 to receive control signal CR1 from analog/digital, the rotary speed R of rotary head drum 5 is adjusted to the second rotary speed R2, and the tape running speed V of tape 6 is adjusted to the second tape running speed V2.It should be noted that magnetic drum velocity of rotation R2 is the frame frequency of the digital video signal that write down of a constant rotation speed and not considering.
Further again, the record bit rate of digital record signal SR3 and the digital video of input and transmission of audio signals relation to bit rate, and the digital record signal comes record with a constant in fact record bit rate, this in fact the constant bit rate determine by the packing density on the tape 6.So maximum input bit rate is decided by the record bit rate, and under the situation of input bit rate less than above-mentioned maximum input bit rate, need to add the aforesaid data that are used for special play-back of emulated data formula and finish record, guarantee the substantial constant of record bit rate simultaneously.For example, when tape 6 was the high quality oxide tape, the record bit rate was approximately 20Mbps, and maximum input bit rate is approximately 15Mbps as mentioned above, and like this, it just can write down the digital video and the audio signal that are 15Mbps to the maximum.
(by the way) in addition, during above-mentioned digital signal record, the gap of magnetic head 2a and 2b and its material are problems.In the common device that is exclusively used in analog record, the recording frequency of audio signal the same low with shown in Fig. 2 (B).The gap length of magnetic head 2a and 2b is obviously greater than magnetic head 1a that is used as videograph and the gap of 1b, reach 1 μ m or more than the 1 μ m, write down the bottom that reaches magnetosphere to satisfy, the magnetic head material therefor is common ferrite, yet by the magnetic recording theory of being learned as can be known, signal can not be recorded or reset under some frequencies.Promptly when the time in this frequency, the gap length of magnetic head is consistent with recording wavelength, correspondingly, the traditional magnetic head that is exclusively used in the analogue audio frequency record can not write down or reset, the digital signal of foregoing high bit rate according to the present invention, is located at gap length half of the recording wavelength that is less than or equal to digital signal in this case, specifically, be equal to or less than 6.3 μ m.
Because narrow head gap length just get magnetic resistance and reduce, and just the waveform of leakage field becomes sharply, can allow high density recording like this, still, on the other hand, reducing of leakage field field intensity reduced record efficiency again.So when the gap of common ferrite head was done very for a short time, the bottom record that simulates sound signal just can not be realized.Therefore, according to the present invention, adopt by metal to replace the feasible bottom record that under above-mentioned closely spaced situation, also allows analog audio that both made of for example ferritic magnetic head of common material.Metal head can be made of various forms, forms a metal magnetic film as the gap portion at common ferrite head and constitutes a kind of metal head.Or on the substrate of no magnetic or photosensitive layer, generate the layer of metal magnetic material and constitute another kind of metal head.Be Sendust, iron tantalum carbon alloy, iron tantalum nitrogen alloy, or to bore be noncrystal as the metal magnetic film.Saturation flux density with the magnetic head of Ferrite Material generally is 0.5T to the maximum, but when use metal magnetic film, saturation flux density rises to 1 to 2T.Therefore, both make head gap length narrow, also allowed the deep layer of a highfield arrival magnetosphere, can guarantee the bottom record of simulated audio signal.In addition, by narrow head gap, can realize short wavelength's record of digital signal with shared magnetic head.
Because the recording frequency of digital signal and simulated audio signal is different, and the record of simulated audio signal must reach the bottom of magnetosphere, and like this, to two types signal, its optimum recording current that can obtain the highest S/N is just different.Therefore, though do not illustrate, it is that digital signal or analog signal change record current according to signal promptly that tracer signal amplifier 24 also has a function.
Shown in Figure 4 is the example of the recording geometry of digital signal. Magnetic head 2a and 2b are recorded in digital record signal SR3 on the tape 6, and forming track width is digital signal track 63a and the 63b of TP2.
Table 1
Project Example 1 Example 2 Example 3 Example 4
Orbit interval ??29μm ??19μm ??24μm ??23μm
The magnetic drum rotating speed ??30rps ??30rps ??30rps ??37.5rps
Tape travelling speed ??16.7mm/s ??11.1mm/s ??13.9mm/s ??16.7mm/s
The magnetic head width ??32μm ??28μm ??28μm ??28μm
Writing time 4 hours 6 hours 4.8 hour 4 hours
Shown in the table 1 be track width be TP2 with respect to magnetic drum velocity of rotation R2, the example of the relation of the magnetic head width TW2 of tape transmission speed V2 and magnetic head 2a and 2b.In all examples, cylinder diameter the same during with analog record is 62mm.
In example 1, track width is that TP2 is made as 29 μ m, and equating during the analog video record of magnetic drum velocity of rotation R2 and 30 frames is 30rps, and tape transmission speed V2 is the analog video of 30 frames half of transmission speed when writing down.(by the way), the existing magnetic head width that is exclusively used in the analogue audio frequency record is about 28 μ m usually.Determining of this value in order to realize the normal play mode of 58 μ m orbit intervals and the slow play mode of 19 μ m orbit intervals with a public magnetic head.But the used magnetic head width of 29 μ m orbit intervals is made as 28 μ m, will produce the gap between track.In addition, consider the magnetic head 2b of relative installation and the mismatch error between 2a, the magnetic head width must be finished no-guard band recording than the wide about at least 3 μ m of orbit interval.So in example 1, orbit interval is made as 29 μ m, and be magnetic head width TW2 about 32 μ m, just allow no-guard band recording, thereby also guaranteed regenerative recording.If the magnetic head width is increased to value as previously discussed, then also can realize the general record and the playback of simulated audio signal.The used time of the analog video signal of one 30 frame of hypothetical record is 2 hours, and then be 2 times of analog record time writing time in this case, reaches 4 hours.Be appreciated that during analog video record, the pattern of example 1 be known as the LP pattern to put logging mode slowly consistent.Therefore, servo circuit comprises a time constant circuit, and this circuit is identical substantially with the structure of time constant circuit in being used in general analogue signal record, and the circuit index also is expected to reduce.
In example 2, tape running speed V2 is made as 1/3 of normal play mode tape running speed during analog video record, and promptly the speed with the slow play mode that is called as LP pattern (is SLP in the U.S.) is consistent, and orbit interval is about 19 μ m.In this case, the magnetic head width equates with common magnetic head width, is about 28 μ m.Be that three times of normal play reach 6 hours writing time.And its servo circuit also comprises time constant circuit, and it is realized by the circuit identical substantially with general analogue signal writing circuit structure, and the circuit index also is expected to reduce.
In addition, when the playback digital signal, because the magnetic head width is wideer than orbit interval, the friendship between track is held together like this will increase, and therefore, the magnetic head width is narrow more, and signal to noise ratio is higher.If but also use identical head records simulated audio signal, then simulated audio signal record format requires the width of magnetic head more than or equal to 20 μ m.Simultaneously, when digital signal was carried out regenerative recording, the magnetic head width must lack 3 μ m than above-mentioned track width, or more.Therefore, for the magnetic head that makes the record digital signal also can write down simulated audio signal, orbit interval must and be less than or equal to 29 μ m more than or equal to 17 μ m, and the magnetic head width must and be less than or equal to 32 μ m more than or equal to 20 μ m.
But not only write down simulated audio signal with a magnetic head and write down digital signal not only but also drawn a new problem.Be exactly that when the tape of the digital form record of resetting with common analog vtr, simulated audio signal can be used as digital signal mistakenly and reset, and produces abnormal sound specifically.This abnormal sound level is very high, and the people is astonished, and sometimes even the loud speaker that can shake brokenly.Avoid the generation of this undesired sound the orbit interval of digital signal can be removed from the orbit interval of general analogue signal.More particularly, each the servo pattern of common register system that is used for analog vtr, typical case's connection scope of capstan servo of its control tape running speed is about ± and 10%, therefore, capstan servo is not suitable for orbit interval and this scope tape devious, and correct sweep record track.As a result, make playback output level instability come sound-inhibiting so just to avoid the generation of undesired sound.As mentioned above, the orbit interval of digital signal be arranged on 21 μ m or than 19 μ m ± 10% bigger, and 26 μ m or than 29 μ m-10% littler between, i.e. the generation of the undesired sound of may command, wherein 19 μ m are orbit intervals of EP pattern, and 29 μ m are the orbit interval of LP pattern.
Shown in Figure 5 is the trace graphics that is used to explain the playback duration of above-mentioned theory.1. 63a shown in the solid line and 63b represent that orbit interval is the digital record track of TP2 among the figure, and for example TP2 is 24 μ m.64a among the figure shown in the dotted line and 64b are audio head 2a and 2b, (for example magnetic head width TW2 is 28 μ m).In this case, as previously mentioned, because capstan servo is no longer suitable, then tape is with the transmission of Sp pattern.And orbit interval is TP under this pattern 358 μ m.When having a displacement between recording track and the track while scan, in fact carry out the shadow region in the drawings, wherein the azimuth of recording track is consistent with the azimuth of track while scan in the shadow region in playback, and make playback levels change.Therefore, playback levels add the above do not move regularly, in most of VTR, carry out the obstruction restituted signal that sound suppresses and offer loud speaker, so also just avoided the generation of undesired sound.
In example 3 and 4, according to above-mentioned condition, the magnetic head width is similar substantially to common magnetic head width, is 28 μ m, orbit interval TP 2Setting to satisfy the requirement of no-guard band recording.Low in example 3 in the tape running speed ratio 1 is about 13.9mm/s, orbit interval TP 2The same with example among the Fig. 5 that describes before this is 24 μ m.Be about 4.8 hours writing time.In example 3, orbit interval TP 2With tape running speed V 2Variation and change, but on the contrary, as tape running speed V 2When remaining unchanged, it is again with the rotating speed R of magnetic drum 2Variation and change.In example 4, magnetic drum velocity of rotation R 2Than the high 37.5rps in the example 1, orbit interval TP 2Be about 23 μ m, be 4 hours writing time.Obviously, tape running speed V 2All can change with the magnetic drum velocity of rotation.
As mentioned above, according to the present invention, approximate or can be with 2 times or the longer time record of common writing time than its better digital video signal with the image quality of common simulation video.Table 1 illustrates four examples, but the present invention has more than and be confined to these examples, and it also comprises the situation that satisfies following condition in fact: orbit interval TP 2More than or equal to 17 μ m and be less than or equal to 29 μ m more preferably greater than or equal 21 μ m and be less than or equal to 26 μ m; to guarantee that be the twice of time of SP pattern simulation record or longer writing time; and make magnetic head width TW2 at least than the wide 3 μ m of orbit interval TP2, to guarantee no-guard band recording and regenerative recording.
Now, id signal generation circuit 42 selects circuit 51 to receive control signal CR1 from analog/digital, and produces the kind that an id signal makes the end discriminating tracer signal of resetting.Identification signal offers magnetic head 4 through record amplifier 44, and is recorded in along the longitudinal direction on the so-called linear track of tape 6.
Audio track or control track can be used as linear track, when using audio track, during the analog video signal record, write down simulated audio signal in due form, during digital video signal recording, and the record identification signal.When using the control track, during the analog video signal record, record controls signal in due form, but during digital video signal recording, for example, control signal is identified signal and carries out pulse-width modulation and be recorded.So just guaranteed that record amplifier 44 and magnetic head 4 can be common to the record of the record of analog video signal and digital video signal and do not need the record amplifier and the magnetic head that provide new in addition.Device is simplified and reduce cost.
Below, replay mode is described.Under this pattern, change over switch 15,25 and 45 is all received " P " end.Identification signal detection circuit 48 receives one by magnetic head 4 playbacks and through record amplifier 46 amplified output signal, and the pulsewidth time of detection output signal, to find an identification signal, it is analog video signal or digital video signal that this identification signal has been represented the signal that is recorded on the tape 6.Then, identification signal that has detected of circuit 48 outputs is given analog/digital discriminator circuit 53.
Analog/digital discriminator circuit 53 receives identification signal from identification signal detection circuit 48, and the signal of determining to be recorded on the tape 6 is analog video signal or digital video signal.Then, analog/digital discriminator circuit 53 produces a control signal CP1, this control signal change over switch 17 and 27 with the connection of replay signal treatment system.The servo circuit 49 same control signal CP1 that receive control to the first rotating speed R1 or the second rotating speed R2 to the rotating speed R of rotary head drum 5, simultaneously the transmission speed V of tape 6 are controlled at the first transmission speed V1 or the second transmission speed V2.
The replay mode of analog video signal at first, is described.
As mentioned above, when analog/digital discriminator circuit 53 is confirmed to be recorded in signal on the tape 6 and is analog video signal, the signal SP1 that is reset by magnetic head 1a and 1b offers analog video replay signal treatment circuit 18 through playback amplifier 16 amplifications and by change over switch 17, and in circuit 18 through the processing opposite with analog video tracer signal treatment circuit 12, the result produces the analog video signal of an original base band at output 19.On the other hand, after the signal SP2 that is reset by magnetic head 2a and 2b is amplified by playback amplifier 26, offer analogue audio frequency replay signal treatment circuit 28, in circuit 28, be converted into the original analog audio signal and through output 29 outputs by change over switch 27.
Then, the digital video signal replay mode is described.
When analog/digital discriminator circuit 53 is confirmed to be recorded in signal on the tape 6 and is digital signal, circuit 53 produces a control signal CP1, CP1 makes change over switch 17 and 27 all switch to the D end, and after playback amplifier 26 amplifies, be input to digital replaying signal treatment circuit 38 by change over switch 27 through signal SP3 that magnetic head 2a and 2b reset.Digital replaying signal treatment circuit 38 is opposite with the operation of digital record signal processing circuit 32, and carry out to separate to be in harmonious proportion and go format, the result, original digital video and audio signal are recovered, and by output 19 outputs.
Shown in Figure 6 is the example block diagram of register system servo circuit 41 and playback system servo circuit 49.As shown in Figure 6, it comprises identification signal generation circuit 42, change over switch 45, magnetic head 4 and identification signal detection circuit 48.In Fig. 6, the input of used field sync signal during parameter 400 representative record analog video signals, 401 is the input of reference signal, 410 is a frequency dividing circuit, 411 and 450 is commutation circuit, and 412 is 1/2 frequency dividing circuit, and 420 and 430 is the speed servo circuit, 421 and 431 is the phase servo circuit, 422 and 432 is add circuit, and 423 and 433 is motor driver, and 424 and 434 is motor, 451 is the 1/N frequency dividing circuit, 452 is pulse shaping circuit, 461 inputs for the identification signal that is recorded, and 462 is the PWM modulation circuit, 463 is the PWM demodulator circuit, and 464 for by the output of the identification signal of being reset.
Below, the logging mode of analog signal is at first described.
When the record analog signal, by field sync signal of port 400 inputs.This field sync signal is to be separated by analog video tracer signal treatment circuit mouth shown in Figure 1.Field sync signal by port 400 inputs offers conversion switch circuit 411.Under this pattern, change-over circuit 411 will be by the field sync signal output of 400 ends input.Signal by change-over circuit 411 outputs offers PWM modulation circuit 462 again after 1/2 frequency dividing circuit 412 carries out 1/2 frequency division.In PWM modulation circuit 462, field sync signal through 1/2 frequency division is carried out pulse-width modulation by the identification signal of importing through port 461, and modulated signal offers the phase servo circuit 421 of Magnetic Drum System and the phase servo circuit 431 of leading system again, also close 45 simultaneously and offer magnetic head 4, be recorded on the tape as control signal through turn-off.
Motor driver circuit 423 drives magnetic drum motor 424 and rotates.At this moment, detect the rotational frequency of magnetic drum motor and it is input to speed servo circuit 420.Speed servo circuit 420 detects the input rotational frequency of magnetic drum motors, and exports a signal with the predetermined frequency different frequency.This difference signal offers addition electrical method 422.On the other hand, magnetic drum motor 424 detects its rotatable phase, and this phase place is provided for phase servo 421.Phase servo 421 is being provided the signal that comes and the phase place of magnetic drum motor to compare by PWM modulation circuit 462, and the signal of exporting a difference of representing them is to adder circuit 422.In add circuit 422, by the difference signal of speed servo circuit 420 inputs and the difference signal addition of being imported by phase servo circuit 421, the signal feedback that obtains after the addition is to motor driver 423.In this manner, the rotation of magnetic drum motor 424 is so control, and the signal that makes its phase place and modulation circuit 462 provide is phase-locked.
Leading system works substantially in the same manner as described above.Driven motor 434 is driven by motor driver 433.The speed of driven motor 434 is detected and offer speed servo circuit 430.Speed servo circuit 430 compares speed and a predetermined frequency of driven motor 434, and exports a difference signal, and it is offered adder circuit 432 successively.On the other hand, the speed of driven motor offers 1/N frequency dividing circuit 451.Signal through frequency division is input to switching circuit 450.Under this pattern, switching circuit switches so that from 1/N frequency dividing circuit 451 output signals.The output signal of switching circuit 450 offers phase servo circuit 431.Phase servo circuit 431 compares the phase place of the phase place of the signal of being imported by PWM modulation circuit 462 with the signal of being imported by switching circuit 450, and exports a difference signal to adder circuit 432.Adder circuit is difference signal that is provided by speed servo circuit 430 and the difference signal addition that is provided by phase servo 431 circuit, and produces one and signal and offer motor driver 433.Motor driver 433 usefulness from the signal of PWM modulation circuit 462 with the driven motor 434 phase-locked controls that realize driven motor.
At playback duration, reference signal is imported through 401 ends, and offers frequency dividing circuit 410.Divider circuit 410 with the input the reference signal frequency division to export a signal that frequency is identical with the frequency of the field sync signal of playback duration.The output signal of divider circuit 410 offers switching circuit 411.Under this pattern, switching circuit 411 is selected the also output signal of output frequency divider circuit 410.The output signal of switching circuit 411 offers 1/2 divider circuit 412, and offers phase servo circuit 421 and 431 by PWM modulation circuit 462 again through the signal of 1/2 frequency division.In this course, PWM modulation circuit 462 does not carry out actual modulation operations and exports the signal of an isopulse width.
The method of operation of Magnetic Drum System and its same in when record, magnetic drum is by phase-locked from the input signal of PWM modulation circuit 462.
Leading system is described below.At playback duration, by magnetic head 4 from the reset control signal during writing down, write and it is offered change over switch 45 of tape 6.Playback time, change over switch 45 outputs to pulse former 452 to the replay signal from magnetic head 4.In pulse former 452, the shaping of the waveform of input signal can be passed through, and for example finishes through a phase comparator.Signal through shaping is input to switching circuit 450, and under replay mode, switching circuit is connected signal and phase servo circuit 431 from pulse former 452.Phase servo circuit 431 is finished control operation by using from the signal of PWM modulation circuit 462 with the control signal on the tape is phase-locked.Like this, in record and replay operations, the magnetic head that is driven by magnetic drum all scans tape with identical phase place, makes that the signal on the tape is reset.
The front has been described when analog signal of input, finishes to be used to control the operating process of watching drum and leading system.Below the operating process that servo circuit shown in Figure 6 is carried out will be described under the digital signal record pattern.
During writing down, the reference signal of being imported by 401 ends offers divider circuit 410.Divider circuit is divided into a suitable value with the frequency of input signal, and offers switching circuit 411 through the output signal of frequency division.When the recording/reproducing digital signal, switching circuit 411 selections and output are from the signal of divider circuit 410.The output signal of switching circuit 411 through 1/2 divider circuit, 412 1/2 frequency divisions after, carry out pulse-width modulation at PWM modulation circuit 462 by identification signal again from input 461.By changing the pulse duration of output signal, in other words, the duty ratio of the duty ratio during by digital signal record during to analog signal record makes the discriminating simplified control of playback duration in modulated process.Subsequently, during as analog signal record, magnetic drum and leading system are synchronous by the output signal of PWM modulation circuit 462.
By the frequency of the reference signal of being imported by port 401 and the frequency dividing ratio of divider circuit 410 are chosen a suitable value, the output signal frequency of 1/2 divider circuit 412 just can be adjusted to desirable magnetic drum rotational frequency.By speed servo circuit 430 the tape transmission speed is adjusted to a desired value, and the frequency dividing ratio of regulating 1/n divider circuit 451 according to the output signal frequency of 1/2 divider circuit 421, the speed transmission that tape just can needs.In addition, make the output signal frequency of divider circuit 410 equate basically that with the field synchronization frequency device of vision signal the revolution in the time of then can making the revolution of the magnetic drum that drives tape and write down analog signal equates.Like this, just make the better of magnetic head and contact with tape, to guarantee recording characteristic well.Frequency dividing ratio is turned down, and the output signal frequency of divider circuit 410 is left under order, the revolution that just can increase magnetic drum at an easy rate to be to improve the relative velocity between magnetic head and tape, therefore, even also can be reset with the signal of fast recording.
At playback duration,, then can be adjusted to equating when writing down to the signal frequency of divider circuit 410 choosing a desired value by the frequency and divider circuit 410 frequency dividing ratios of the reference signal of 401 ends inputs.Therefore, Magnetic Drum System with leading system during with the playback analog signal the same identical mode work.And magnetic drum is phase-locked by the output signal of PWM modulation circuit 462.Also phase-locked from the control signal that tape is reset by the output signal of PWM modulation circuit 462, in this manner, can heavily manage tracer signal.
The output signal of pulse shaper 452 also offers PWM demodulator circuit 463, and for example, the duty ratio of output signal is used to confirm that the signal that is write down is analog signal or digital signal.Then, identification result is as 464 outputs of identification signal output.
Shown in Figure 7 is block diagram according to another embodiment of video signal recording of the present invention and replay device.Among the figure, parameter 1c, on behalf of magnetic head, 52,1d and 2c represent a digital recording mode selection circuit, and 54 is digital record mode identificating circuit, (other parts are identical with its parameter used in Fig. 1), use with Fig. 1 in other parts of identical parametric representation are corresponding components of Fig. 1.Present embodiment is characterised in that to provide to analog record and digital record puts logging mode slowly.
The same with the operation of putting logging mode record analog signal slowly with the recording operation of the common unit that is exclusively used in analog record.More particularly, select circuit 51 at analog/digital, when selecting an analog video signal as tracer signal, and when analog record mode selection circuit (not shown) is selected slow mode playback, register system servo circuit 41 controls to the first rotary speed R1 to the rotating speed R of rotary head drum, and R1 equates with the speed of normal play SP pattern.And the tape running speed V of tape 6 controlled to the first tape running speed V under the SP pattern 11/2 (CP pattern) or 1/3 (EP pattern).Orbit interval TP like this 1Be 1/2 or 1/3 of the orbit interval under the SP pattern.Then, with Fig. 2 in (A) shown in class signal like analog video tracer signal SR 1Be provided for the magnetic head 1c and the 1d that are used for putting slowly record, and be recorded in the top layer of tape track.One with Fig. 2 in like the class signal shown in (B) analogue audio frequency tracer signal SR2 be recorded in the deep layer of tape track by magnetic head 2a and 2b.
Below, the digital video signal recording pattern is described.
Digital record mode selection circuit 52 is selected a kind of pattern according to the transmission bit rate of input digital video signal and digital audio and video signals from various modes, and produce an output control signal CR2, with regard to normal play mode, its operation is with reference to embodiment illustrated in fig. 1 being described.
On the other hand, under slow mode playback, its digital video and transmission of audio signals bit rate are the 1/N of standard transmission bit rate, record servo circuit 41 receives the control signal CR2 of digital record mode selection circuit 52 outputs, the rotating speed of rotary head drum 5 is controlled to the second rotary speed R2, and wherein R2 equates with rotating speed under normal play mode.And the tape running speed V of tape 6 controlled to speed (V 2/ N), it is the second tape running speed V under normal play mode 21/N.On the other hand, the output of digital record signal processing circuit 32 is one and is compressed to 1/N through time domain, with the tracer signal of the rotational synchronization of rotary head drum 5.
The magnetic head 2a that is mounted on the rotary head drum 5 shown in Figure 8, the example of the proper height of 2b and 2c, for example, on magnetic drum, magnetic head 2c has identical azimuth with magnetic head 2b, and installs very closely with magnetic head 2c.The value of the difference Ha of the proper height of magnetic head 2a and 2c is set according to its spacing .
Shown in Figure 9 is the example of sequential rotation and digital record SR3 of rotary head drum 5.(A) among Fig. 9, (B) and (C) represent the sequential of rotary head drum 5 respectively and under normal play mode digital record signal SR3 and under slow play mode the sequential chart of digital record signal SR3.In A, between low period, come record by magnetic head 2a and 2c.As shown in the figure, under normal play mode, write down continuous (constant) tracer signal SR3, under slow mode playback, record be to be compressed to 1/N's and the tracer signal SR3 synchronous with the rotation of rotary head drum 5 through time domain.Under above situation, because the tape running speed V of tape 6 1/N when being controlled to normal play mode, identical among record format and Fig. 4, thereby form track 63a and the 63b that has with the orbit interval TP2 that cardinal principle is identical under normal play mode.
By as can be seen above, during the audio signal of the digital video that has a low transmission bit rate with respect to reference number video and audio signal when one of record with standard transmission bit rate, the time domain compression ratio is not considered the feasible record of transmission bit rate bit rate constant according to the ratio N variation of transmission bit rate, and because the invariablenes turning speed of rotary head drum 5, then packing density just can be constant.Thereby when holding the record density constant, N times put slowly also just can realize.In Fig. 9 (C) example illustrated, time domain compression ratio N is 2, but it can also be any integer.Especially, when N is even number, can use magnetic head 2a and 2c shown in the figure example, write down a signal, when N is odd number, then come record by magnetic head 2a and 2b through the time domain compression.Thus, the various patterns that can realize comprising the normal play mode of N=1 are used the public record of track form on tape 6.
The magnetic head 2a that is mounted on the rotary head drum 5 shown in Figure 10, another example of the proper height of 2b and 2c, on magnetic drum, the azimuth angle alpha of magnetic head 2c 1Different with magnetic head 2a and 2b, and magnetic head 2c installs with an adjacent poor magnetic head 2a of proper height Hb.The azimuth angle alpha of magnetic head 2c 1A suitable value is arranged, and is 0 ° or opposite with azimuthal tendency that nigh magnetic head 2a+30 ° is installed.For example be made as-6 °.Azimuth angle alpha 1Can be the same with the situation of embodiment among Fig. 8 be-30 °, but consider the extendability of the HD pattern that will describe subsequently, α 1Can satisfy the extendability of HD pattern when being 0 ° better.The value of the poor Hb of the proper height of magnetic head 2a and 2c as shown in FIG., for from orbit interval TP2, deducting the difference behind the height H a that determines by the spacing between magnetic head 2a and the 2c.
Figure 11 is the oscillogram of another example of the sequential of rotary head drum 5 and digital record signal SR3, and magnetic head puts in order among the corresponding Figure 10 of sequential.As among Fig. 9, be illustrated as the sequential chart of rotary head drum 5 in (A), (B) be the sequential chart of digital record signal SR3 under the normal play mode, (C), (D) be the sequential chart of digital record signal SR3 under slow mode playback.In (A), between low period, finish record by magnetic head 2a or 2c, between high period, 2b finishes record by magnetic head.As shown in the figure, under normal play mode, record be continuous (constant) tracer signal SR3, under slow mode playback, being and being compressed to 1/N and the tracer signal SR3 synchronous of record with the rotation of rotary head drum 5 through time domain.Close among recording geometry in this case and Fig. 4.
Below, the operation of playback duration is described.
Identification signal detection circuit 48 receives that a magnetic head 4 is reset and through playback amplifier 46 amplifying signals, and to detect the signal that representative is recorded on the tape 6 be the analog video signal or the identification signal of digital video signal.Then, circuit 48 outputs to analog/digital discriminator circuit 53 and digital record pattern discriminator circuit 54 to detected identification signal.
Analog/digital discriminator circuit 53 receives identification signal from identification signal detection circuit 48, and determine to be recorded in signal on the tape 6 and be analog video signal or digital video signal, produce a control signal CP1 thus, CP1 make change over switch 17 and 27 and the treatment system that is used for replay signal connect.
Under the pattern of playback analog signal, the operation of this device is similar with the common unit that is exclusively used in analog record.More particularly, when analog/digital discriminator circuit 53 confirms that the signal that is recorded on the tape 6 is an analog video signal, and when analog record pattern discriminator circuit (not shown) confirmed that also this signal is slow mode playback, playback system servo circuit 49 controlled to the tape running speed V of the rotating speed R of rotary head drum 5 and tape 6 and its velocity amplitude identical during writing down.Then, the analog video signal that is recorded in the top layer is reset by magnetic head 1c and 1d, and the simulated audio signal that is recorded in deep layer is reset by magnetic head 2a and 2b.
The pattern of playback digital video signal is described now.
When analog/digital discriminator circuit 53 confirms that the signal that is recorded on the tape 6 is a digital video signal, and when digital record pattern discriminator circuit 54 confirms that this signal is slow mode playback, playback system servo circuit 49 receives output control signal CP1 and CP2, and the tape running speed V of the rotating speed R of rotary head drum 5 and tape 6 is controlled to and its velocity amplitude identical during writing down.Especially, the rotating speed R of rotary head drum 5 is controlled to and its second identical under normal play mode rotating speed R2, and the tape running speed of tape 6 is controlled to the 1/N of its second tape running speed V2 under normal play mode, like this could be consistent with logging mode.Then, the digital signal that has write down by when record used magnetic head 2a and 2b or 2a and 2c reset.
As mentioned above,, only increase a magnetic head, just can realize the multiple slow mode playback consistent with the value of transmission bit rate according to present embodiment.
Figure 12 and 13 represents the figure according to magnetic head configuration among another embodiment of video signal recording of the present invention and replay device and magnetic head setting height(from bottom) respectively.In the drawings, parameter 3a and 3b represent magnetic head respectively, and they and magnetic head 2a and 2b differ 60 °, and are installed in and highly are the position of Hc, to meet their inside spacing.By with Fig. 7 and Fig. 8 in other parts of representing of identical parameters, and Fig. 7, the parts in Fig. 8 circuit diagram are corresponding.Present embodiment is characterised in that: except that putting logging mode slowly, it is that (for example digital video signal and the digital audio and video signals logging mode (HD pattern hereinafter referred to as) of 15Mbps～30Mbps), its method of operation is identical with method in Fig. 1 and the described related embodiment of Fig. 7 for standard transmission bit rate twice that a kind of transmission bit rate also is provided.The operation of HD pattern will be described below.
When digital record mode selection circuit 52 is selected the HD pattern, register system servo circuit 41 receives a control signal CR2 by circuit 41 outputs, the rotating speed R of rotary head drum 5 is controlled to and its second identical under normal play mode rotary speed R2, and the tape running speed V of tape 6 is controlled to the twice of its tape running speed V2 under normal play mode.On the other hand, the tracer signal SR3 of two passages of digital record signal processing circuit 32 outputs.
Figure 14 is an oscillogram, rotation of its expression rotary head drum 5 and the sequential of digital record signal SR3.In Figure 14, (A), (B) and (C) represent rotary head drum 5 and the sequential chart of digital record signal SR3 under the HD pattern respectively.For convenience of explanation, the sequential of digital record signal SR3 under normal play mode and the digital record signal SR3 under slow mode playback (E) illustrates also at (D).As shown in the figure, under the HD pattern, the tracer signal SR3 of two passages of output, the tracer signal of these two passages is because the difference of its setting angle has a phase difference, thus each other, tracer signal (B) is come record by magnetic head 2c and 2b, and tracer signal (C) is come record by magnetic head 3a and 3b.
Figure 15 is illustrated in the recording geometry of above-mentioned time.Because the tape running speed V of above-mentioned tape 6 is controlled to the twice of tape running speed under normal play mode, by the track 64b of separately head records, 64c, the orbit interval of 64d and 64e with consistent at the orbit interval of normal play mode be TP2.
As from the foregoing, according to present embodiment, the record of constant packing density and playback can be by not only under normal play mode and slow mode playbacks, and under digital video with the data volume that doubles the standard transmission bit rate and audio signal, HDTV as through high efficient coding adopts common track form to realize.
Shown in Figure 16 and 17 the magnetic head configuration and the magnetic head setting height(from bottom) figure of expression according to another embodiment of video signal recording of the present invention and replay device.Present embodiment is different from the embodiment of Figure 12 and 13, in 12 and 13 embodiment, magnetic head 3a and 3b are mounted respectively and are differing on 90 ° the position with magnetic head 2a and 2b, can produce such effect thus, promptly magnetic head 3a and 3b and magnetic head 2a and 2b can simplify at sustained height and their installation.
Figure 18 and Figure 19 represent according to the magnetic head configuration of another embodiment of video signal recording of the present invention and replay device and magnetic head setting height(from bottom).In the drawings, parameter 2d represents magnetic head, and its azimuth is α 2 and is installed near on the position of magnetic head 2b.Magnetic head 2b and 2d be in identical setting height(from bottom) in that the magnetic head 2a shown in Figure 10 is the same with 2c, and the value of setting height(from bottom) Hb equals to deduct poor behind the height H a that is determined by its spacing  from orbit interval TP2.
Present embodiment is such example, and wherein the magnetic head configuration of Figure 10 can expand to the HD pattern and adapt.In this case, the sequential of the rotating speed sequential of rotary head drum 5 and digital record signal SR3 is shown in Figure 20, and recording geometry is shown in Figure 21.As shown in the figure, the sequential of the tracer signal SR3 reality of two system's outputs is substantially the same.Thus, (B) tracer signal in is by magnetic head 2a and 2b record, and (C) tracer signal in is by magnetic head 2c and 2d record.
If consider azimuth angle alpha 1 and the α 2 of magnetic head 2c and 2d, can find out track 65a from the recording geometry of Figure 21,65c, the azimuth of 65b and 65d is with+30 °, and α 1, and the order of-30 ° and α 2 repeats.If selecting α 1 is-30 °, adjacent track 65c has identical azimuth and does not allow to carry out no-guard band recording with 65b.This is to contradict with the description of respective embodiments among Figure 10 because of establishing the fact of α 1 for-30 °.If α 1 selects-6 °, α 2 selects+6 °, and then azimuthal difference is 36 ° and 24 ° between adjacent track.In this case, it is uneven that azimuthal difference becomes, but more or less can allow no-guard band recording, and owing to the azimuth of using ± 6 °, make the general of analog video magnetic head to realize.When the azimuth all was made as 0 °, it is maximum that the azimuthal difference of adjacent track reaches on the position of balance but needless to say.This is that the embodiment of optimum efficiency, α 1 can be made as 0 ° because describe in the corresponding embodiment of Figure 10.
Like this, present embodiment only need increase by two magnetic heads and just can satisfy all patterns that comprise slow mode playback and HD pattern well.
As mentioned above, according to the present invention, the vision signal of encoding through digital compression can be recorded on the public recording medium, and can reset from the public records medium.Simultaneously and existing simulation VIR protection exchange.In addition, because the magnetic head configuration can remain unchanged, like this, magnetic head can be realized by common configuration, and realize that this digital record function can make the funds loss reduce to minimum.
In addition,, like this, the formula tape of digital record was reset in common analog vtr, also can have been avoided producing unusual sound because the orbit interval during the digital video record is made as between 21 μ m to the 26 μ m.
Have again, only, just can realize putting slowly record, increase by two or three magnetic heads and just can realize comprising putting slowly and write down and the record of all patterns of the high-speed record of double bit rate by increasing a signal magnetic head.

Claims (26)

  1. One kind be used to select analog video signal or as the digital information signal of digital vision signal, and, comprising the tape deck of described selecteed signal record on tape:
    One first magnetic head is installed in the primary importance of rotary head drum, and has the first party parallactic angle;
    One second magnetic head, be installed in relative with the described primary importance 180 ° second place of described magnetic drum, and have and the opposite polarity second party parallactic angle of described first party parallactic angle, described first and second magnetic heads write down an audio signal along first recording track in the deep layer of described tape before the described analog video signal of record;
    One the 3rd magnetic head is installed in the 3rd position of described rotary head drum, and has third party's parallactic angle;
    A quadruplex videotape recorder, be installed in four position relative 180 ° of described rotary head drum with described the 3rd position, and have and the opposite polarity cubic parallactic angle of described third party's parallactic angle, described third and fourth magnetic head along described first recording track at the described analog video signal of the skin record of described tape and be superimposed upon on the audio signal of described precedence record; And
    A servomechanism installation that is used for driving described rotary head drum with first rotary speed, and in described analog video signal of record and described audio signal, control described tape with the first tape running speed transmission,
    Wherein, described servomechanism installation rotate described rotary head drum with second rotary speed and with the speed control of described tape in second tape running speed, write down described digital information signal simultaneously; And
    Wherein, described first and second magnetic heads write down described digital information signal at described tape upper edge second recording track.
  2. 2. tape deck as claimed in claim 1, wherein said first and second magnetic heads are metal head, and the head gap is equal to or less than half of described digital information signal recording wavelength or be 0.3 μ m.
  3. 3. tape deck as claimed in claim 1, the orbit interval of wherein said second recording track are less than or equal to 29 μ m.
  4. 4. tape deck as claimed in claim 1, the orbit interval of wherein said second recording track is more than or equal to 21 μ m and be less than or equal to 26 μ m.
  5. 5. tape deck as claimed in claim 1, the magnetic head width of wherein said first and second magnetic heads is more than or equal to 20 μ m and be less than or equal to 32 μ m.
  6. 6. tape deck as claimed in claim 1, the magnetic head width of wherein said first and second magnetic heads is than the wide 3 μ m of the orbit interval of described second track.
  7. 7. tape deck as claimed in claim 1, wherein said first rotary speed equals the frame frequency of described analog video signal, and as 30/1.001rps or 25rps, and described second rotary speed is more than or equal to 30/1.001rps.
  8. 8. tape deck as claimed in claim 1, wherein said first rotary speed equals the frame frequency of described analog video signal, and as 30/1.001rps or 25rps, and described second rotary speed equals 30/1.001rps or 30rps.
  9. 9. tape deck as claimed in claim 1 also comprises:
    Be used to produce the device of identification signal, this identification signal indicate described quilt selectively tracer signal be described digital information signal; And
    One the 5th magnetic head is used for tracking control signal of record on the linear track of described tape,
    Wherein said the 5th magnetic head directly writes down described tracking control signal in the described analog video signal of record, or writes down the described tracking control signal after described identification signal modulation in the described digital information signal of record.
  10. 10. tape deck as claimed in claim 1 further comprises:
    To described digital information signal apparatus for encoding, described encoded digital information signal has one to preset bit rate according to initialize format; And
    One the 5th magnetic head is installed in the 5th position of described rotary head drum, and is approximate and in its vicinity with the height of described first magnetic head, and has described second party parallactic angle,
    Wherein said code device is encoded according to the digital information signal that described initialize format will have the scheduled transmission bit rate, or be that second digital information signal of the 1/N (N is the big integer of a ratio 1) of described scheduled transmission bit rate is encoded with transmission bit rate according to described initialize format, and temporarily be compressed to 1/N, each described first and second digital information signal of having encoded has described pre-put bit rate;
    Wherein said servomechanism installation controls to second tape running speed with described tape and writes down described first digital information signal simultaneously, or i.e. the 3rd tape running speed of the 1/N that the tape running speed of described tape is controlled to described second tape running speed, write down described second digital information signal simultaneously; And
    Wherein said first and second magnetic heads are described first digital information signal through coding of described second recording track record in described tape upper edge, or described first and second magnetic heads or the described first and the 5th magnetic head in described tape upper edge described second digital information signal of having encoded of described second recording track record.
  11. 11. tape deck as claimed in claim 1 also comprises:
    To described digital information signal apparatus for encoding, described digital information signal through coding has the predetermined recording bit rate according to predetermined format; And
    One the 5th magnetic head is installed in the 5th position of described rotary head drum, near described first magnetic head, and than the orbit interval of high about described second recording track of described first magnetic head, and have the 5th azimuth,
    Wherein said code device is encoded according to first digital information signal that described initialize format will have the scheduled transmission bit rate, or be that second digital information signal of the 1/N (N for than 1 big integer) of described scheduled transmission bit rate is encoded with transmission bit rate according to described initialize format, and temporarily being compressed to 1/N, each described first and second digital information signal of having encoded has described pre-put bit rate;
    Wherein said servomechanism installation controls to described second tape running speed to described tape and writes down described first digital information signal simultaneously, or the 3rd tape running speed that the tape running speed of described tape is controlled to the 1/N of described second tape running speed writes down described second digital information signal simultaneously; And
    Wherein said first and second magnetic heads write down the described first encoded digital information signal at described second recording track in described tape upper edge, or described first and second magnetic heads or the described first and the 5th magnetic head in described tape upper edge described second digital information signal of having encoded of described second recording track record.
  12. 12. tape deck as claimed in claim 10 further comprises:
    One the 6th magnetic head is installed on the 6th position of described rotary head drum, and has described first party parallactic angle; And
    One the 7th magnetic head is installed in the 7th relative 180 ° with described the 6th magnetic head on described rotary head drum position, and has described first party parallactic angle,
    Wherein said code device is that the 3rd digital information signal of described scheduled transmission bit rate twice is encoded according to described initialize format with transmission bit rate, and being assigned to two passages, the distributing signal of described two passages has described booking situation bit rate respectively;
    Wherein said servomechanism installation is controlled at the 4th tape running speed that doubles described second tape running speed to described tape, writes down described the 3rd digital information signal simultaneously; And
    Wherein said the second, the six, the 5th and the 7th magnetic head is described the 3rd digital information signal of having encoded of described second recording track record in described tape upper edge.
  13. 13. tape deck as claimed in claim 11 further comprises:
    One the 6th magnetic head is installed in the 6th position of described rotary head drum, near described second magnetic head, and than the high approximately orbit interval of described second recording track of described second magnetic head, and have the 6th azimuth,
    Wherein said code device is that the 3rd digital information signal of described scheduled transmission bit rate twice is encoded according to described initialize format with transmission bit rate, and distribute to two passages, the described signal that is assigned to two passages has described booking situation bit rate respectively;
    Wherein said servomechanism installation controls to the 4th tape running speed that is twice in described second tape running speed to described tape, writes down described the 3rd digital information signal simultaneously; And
    Wherein said the first, the five, the second, the six magnetic head is three digital information signal of described second recording track record through encoding in described tape upper edge.
  14. 14. one kind is used to select analog video signal or digital information signal such as digital vision signal, and with described selecteed signal record on tape and the record of the described tracer signal of resetting and replay device, comprising:
    One first magnetic head, it is contained in the primary importance of rotary head drum, and has a first party parallactic angle;
    One second magnetic head, be installed on relative with the described primary importance 180 ° second place of described rotary head drum, and have one with the opposite polarity second party parallactic angle of described first party parallactic angle, described first and second magnetic heads are before the described analog video signal of record, at the bottom of described tape along the first recording track recorde audio signal, and the described audio signal that has write down of resetting;
    One the 3rd magnetic head is installed in the 3rd position of described magnetic drum, has third party's parallactic angle;
    A quadruplex videotape recorder, be installed in the 4th relative 180 ° on described rotary head drum position with described the 3rd position, and have and the opposite polarity cubic parallactic angle of described third party's parallactic angle, described third and fourth magnetic head writes down described analog video signal and is superimposed upon on the audio signal of precedence record along described first recording track on the top layer of described tape, and the described analog video signal that has write down of resetting; And
    A servomechanism installation drives rotary head drum and described tape is controlled at first tape running speed with first rotary speed, write down simultaneously and reset described analog video signal and described audio signal,
    Wherein said servomechanism installation drives rotary head drum and the tape running speed of described tape is controlled to second tape running speed with second rotary speed, and described digital information signal simultaneously writes down and reset; And
    Wherein said first and second magnetic heads write down described digital information signal and reset the described digital information signal that is recorded at described tape upper edge second recording track.
  15. 15. record as claimed in claim 14 and replay device, wherein said first and second magnetic heads are metal heads, and its gap length be less than or equal to described digital information signal recording wavelength half or be 0.3 μ m.
  16. 16. record as claimed in claim 14 and replay device, the orbit interval of wherein said second recording track are less than or equal to 29 μ m.
  17. 17. record as claimed in claim 14 and replay device, the orbit interval of wherein said second recording track is more than or equal to 21 μ m and be less than or equal to 26 μ m.
  18. 18. record as claimed in claim 14 and replay device, the magnetic head width of wherein said first and second magnetic heads is more than or equal to 20 μ m and be less than or equal to 32 μ m.
  19. 19. record as claimed in claim 14 and replay device, the magnetic head width of wherein said first and second magnetic heads is than the wide 3 μ m of the orbit interval of described second recording track.
  20. 20. record as claimed in claim 14 and replay device, wherein said first rotary speed equal frame frequency such as the 30/1.001rps or the 25rps of described analog video signal, and described second rotary speed is more than or equal to 30/1.001rps.
  21. 21. record as claimed in claim 14 and replay device, wherein said first rotary speed equal frame frequency such as the 30/1.001rps or the 25rps of described analog video signal, and described second rotary speed equals 30/1.001rps or 30rps.
  22. 22. record as claimed in claim 14 and replay device further comprise:
    Be used to produce the device of identification signal, this identification signal indicate described quilt selectively tracer signal be described digital information signal;
    One the 5th magnetic head is used for tracking control signal of record on the linear track of described tape, and the described tracking control signal that has write down of resetting; And
    Be used for detecting described identification signal, and differentiate that the signal that has write down is the device of described digital information signal from the signal of resetting by described the 5th magnetic head,
    Wherein said the 5th magnetic head directly described tracking control signal of record writes down described analog video signal simultaneously, perhaps writes down by the described tracking control signal after the described identification signal modulation and writes down described digital information signal simultaneously.
  23. 23. record as claimed in claim 14 and replay device further comprise:
    Be used for according to initialize format the digital information signal apparatus for encoding, described digital information signal of having encoded has a pre-put bit rate;
    Be used for according to the device of initialize format, and produce described original digital information signal described playback digital information signal decoding; And
    One the 5th magnetic head is installed on the described rotary head drum basic identical near described first magnetic head and height and described first magnetic head, and has described second party parallactic angle,
    Wherein said code device will have first digital information signal coding of scheduled transmission bit rate according to described initialize format, or with transmission bit rate second digital information signal coding of described scheduled transmission bit rate 1/N (N for greater than 1 integer) according to described initialize format, and temporarily being compressed to 1/N, each described first and second digital information signal of having encoded has described predetermined recording bit rate;
    Wherein said servomechanism installation is adjusted to described second tape running speed described first digital information signal that writes down simultaneously and reset with described tape, or i.e. the 3rd tape running speed described second digital information signal that writes down simultaneously and reset of the 1/N that described tape is controlled to described second tape running speed;
    Wherein said first and second magnetic heads are described second recording track described first digital information signal of having encoded of record and described first digital information signal that has write down of resetting in described tape upper edge, or described first and second magnetic heads or the described first and the 5th magnetic head in described tape upper edge described second recording track described second digital information signal of having encoded of record and described second digital information signal that has write down of resetting; And
    Wherein said decoding device is decoded first digital information signal of described playback according to described initialize format and is produced the described first original digital information signal, or according to of the second digital information signal decoding of described initialize format with described playback, and doubly, and produce the described second original digital information signal decoded described second digital information signal expansion N.
  24. 24. record as claimed in claim 14 and replay device further comprise:
    Be used for according to initialize format described digital information signal being decoded, described decoded digital information signal has a booking situation bit rate;
    Be used for according to described initialize format with the decoding of described playback digital information signal and produce described original digital information signal; And
    One the 5th magnetic head, the 5th position that is installed in described rotary head drum be near described first magnetic head and than the high approximately orbit interval of described second recording track of described first magnetic head, and have one the 5th azimuth,
    Wherein said code device will have first digital information signal coding of scheduled transmission bit rate according to described initialize format, or according to described predetermined format be with transmission bit rate described scheduled transmission bit rate 1/N (N for greater than 1 integer) the decoding of second digital information signal and temporarily be compressed to 1/N, each described first and second digital information signal of having encoded has described booking situation bit rate;
    Wherein said servomechanism installation controls to second tape running speed described first digital information signal that writes down simultaneously and reset with described tape, and the 1/N that perhaps described tape is controlled to be described second tape running speed i.e. the 3rd tape running speed described second digital information signal that writes down simultaneously and reset;
    Wherein said first and second magnetic heads are described second recording track described first digital information signal of having encoded of record and described first digital information signal that has write down of resetting in described tape upper edge, or described first and second magnetic heads or the described first and the 5th magnetic head in described tape upper edge described second recording track described second digital information signal of having encoded of record and described second digital information signal that has write down of resetting; And
    Wherein said decoding device is decoded first digital information signal of described playback according to described initialize format and is produced the described first original digital information signal, or according to of the second digital information signal decoding of described initialize format, and by the described second original digital information signal of coefficient N expansion back generation with described playback.
  25. 25. record as claimed in claim 23 and replay device further comprise:
    One the 6th magnetic head is installed in the 6th position of described rotary head drum, has described first party parallactic angle; And
    One the 7th magnetic head is installed in the 7th relative 180 ° with described the 6th magnetic head on described rotary head drum position, has described first party parallactic angle,
    Wherein said code device is two times the 3rd digital information signal coding of described scheduled transmission bit rate with transmission bit rate according to described initialize format, and being assigned to two passages, the described signal that is assigned to two passages has described booking situation bit rate respectively;
    Wherein said servomechanism installation controls to the 4th tape running speed for the described second tape running speed twice described the 3rd digital information signal that writes down simultaneously and reset with described tape;
    Wherein said the second, the six, the 5th and the 7th magnetic head is described second recording track described the 3rd digital information signal of having encoded of record and described the 3rd digital information signal that has write down of resetting in described tape upper edge; And
    Wherein said decoding device is decoded the 3rd digital information signal of described playback according to described initialize format, and with the data combination through decoding of described two passages, and produces described the 3rd original digital information signal.
  26. 26. record as claimed in claim 24 and replay device further comprise:
    One the 6th magnetic head is installed in the 6th position of described rotary head drum, near described second magnetic head and than the orbit interval of high about described second recording track of described second magnetic head, and has one the 6th azimuth,
    Wherein said code device according to described initialize format be with transmission bit rate described scheduled transmission bit rate twice the 3rd digital information signal coding and be assigned to two passages, the distributing signal of described two passages has described booking situation bit rate respectively;
    Wherein said servomechanism installation controls to the 4th tape running speed for the described second tape running speed twice described the 3rd digital information signal that writes down simultaneously and reset to described tape;
    Wherein said the first, the five, the second and the 6th magnetic head is described second recording track described the 3rd digital information signal of having encoded of record and described the 3rd digital information signal that has write down of resetting in described tape upper edge; And
    The 3rd digital information signal decoding that wherein said decoding device is reset described according to described initialize format, and with the data combination of described two passages, and produce described the 3rd original digital information signal.
CN 95121672 1994-12-19 1995-12-19 Video signal recording apparatus and video signal recording and reproducing apparatus Pending CN1161618A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 95121672 CN1161618A (en) 1994-12-19 1995-12-19 Video signal recording apparatus and video signal recording and reproducing apparatus

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP314450/94 1994-12-19
JP317947/94 1994-12-21
CN 95121672 CN1161618A (en) 1994-12-19 1995-12-19 Video signal recording apparatus and video signal recording and reproducing apparatus

Publications (1)

Publication Number Publication Date
CN1161618A true CN1161618A (en) 1997-10-08

Family

ID=5082482

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 95121672 Pending CN1161618A (en) 1994-12-19 1995-12-19 Video signal recording apparatus and video signal recording and reproducing apparatus

Country Status (1)

Country Link
CN (1) CN1161618A (en)

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