CN1991992A - Optical record device reading channel frequency by using dither signal detection and playing method thereof - Google Patents

Abstract

The invention relates to optical record device and method which uses shake signal to detect signal frequency, said device includes: optical pick-up which detects shake signal and radio frequency (RF) signal recorded in the optical record medium; frequency detect device which generates the shake signal and sync signal; frequency information conversion device which calculates the radio frequency analogy wave frequency information using the shake signal and sync signal; phase control device which controls the radio frequency signal phase using the calculated radio frequency analogy wave frequency information. The invention confirms the input frequency bit data input frequency using the shake signal in recording disc such as CD-R,DVD+-R/RW,BD-R/W, the synchronism of channel can be achieved quickly and precisely.

Description

Utilize dither signal to detect the optical recorder and the player method thereof of reading channel frequency

Technical field

The present invention relates to utilize dither signal, detect the optical recorder and the player method thereof of reading channel frequency, in particular for play CD-R, DVD+-R/RW, record such as BD-R/RW is with storing in the CD along Bit data, for necessary process is radio frequency (RF) simulating signal corresponding synchronous process, utilizes record whole already present dither signals in the CD, the method that inputs to the data frequency composition that reads channel that gets.

Background technology

Record in the optical disc surface and divide into 0 and 1 bit information, this information reads the difference of laser reflectivity because of existing in light picker, so read and 0 and 1 form corresponding radio frequency analog waveform.In the dvd playback receiving trap, read the radio frequency analog waveform of such generation, play the Bit data that writes down on the CD.In this course, according to the speed of CD rotation, different to the speed (this is called data transfer rate (data rate) or channel rate (channel rate)) of receiving trap input bit data.In receiving trap, utilize common phase-locked loop (Phase locked loop ' PLL '), conform to phase place with the input data frequency, sample (this is called synchronization (synchronization)), generate the process of Bit data.

But, the initial stage of frequency simulating signal input is because can't get the primary data incoming frequency, so the sampling frequency that generates in data incoming frequency and the common phase-locked loop there are differences, for reducing this species diversity, (this is called pull-in time) in the common phase-locked loop through for a long time.Frequency difference is big more, its time is long more, in addition, according to the feature of common phase-locked loop, common phase-locked loop is because there is frequency range (pull-in range), so the data frequency of initial stage input and the difference of sampling frequency are when leaving this scope, can not be synchronously, the broadcast of Bit data is also impossible, and institute thinks the common phase-locked loop of help collection, auxiliary ligand has the frequency detecting device (frequency detector, ' FD ') that is used to reduce sampling frequency and input data frequency difference.Under the normal optical disk situation, have the distinctive signal (being called ' synchronous mode ') of the binding of distinguishing signal, the frequency detecting device of conventional situation utilizes the length and the interval of this synchronous mode, detects frequency.

On the other hand, during recordable CD situation, be the position of performance optical disc information and Bit data record, definition comprises the signal of information on the magnetic track, according to the kind of CD, though have mutually different form, it is referred to as shake (wobble) signal.Dither signal is that the form as definition optical disc information and Data Position occurs when disc making.The user utilizes wobble information when being recorded in Bit data on the CD, obtain the necessary optical disc information of record, and decision disk rotation speed and recording frequency are recorded in assigned address on the CD with data.

This dither signal has certain form according to the length of a certain amount of data storage, so when CD used in the rotation record, utilize this dither signal, also can control spindle motor (Spindle Motor).In addition, record is during Bit data, and is synchronous with dither signal on this CD, conforms to come record data with position on the CD, thus record with the Bit data of light disc recording also with CD on dither signal synchronous.

The channel that reads that is used for played data is for still only utilizing the method for the frequency simulating signal that generates in the CD Bit data with the existing method that the incoming frequency of data conforms to phase place.In this case, be to use input, detect frequency and make phase locked method after the effective frequency signal of Bit data.When making in this way in the CD-R, realize spindle motor is stably controlled by dither signal, in the CD rotation, only utilize the frequency simulating signal of importing to detect the phase place of frequency, promptly handle dither signal, learn in the state of disk rotation speed, only utilize the frequency simulating signal once more.

Fig. 1 is the dither signal structural drawing of recording type optical disc, kind according to each CD, the shake pattern is also different, the example that is dithered as with DVD-R/RW, when CD used in record, do not comprise Bit data when making for the first time, so stored CD information, the dither signal state is made in position during afterwards for the stored record Bit data when making CD.This dither signal has the deformation form of signal specific on the CD magnetic track or frequency, promptly, it is common that to read special-purpose cd situation magnetic track pattern be linear pattern, record during with CD the pattern of this magnetic track be sinusoidal wave form or make specific signal, the information of stored CD record necessity.Fig. 1 is to be the synoptic diagram that example is illustrated with this jitter mode.Optical disk distinguishing is the flat region that records the land pre-pit district of Bit data and distinguish the pit district between the pit district.Reading when this pit district and smooth form enlarge under the special-purpose cd situation is the form of straight line, but record is with under the CD situation, the position that record is necessary is necessary to be presented on the CD, and be necessary to control or the information of rotary CD, so it is same as shown in Figure 1, the magnetic track apperance has sinusoidal wave form, and has a certain frequency characteristic, on this magnetic track, comprise and have different frequency characteristics, the data message (this information formation according to disc types and difference) that perhaps between magnetic track, has the pit district form of signal specific, when so CD used in record, utilize this dither signal control CD, obtain the very necessary information of record, the position that storage is used to store user's Bit data.

Fig. 2 only utilizes frequency simulation form in reading channel, the expression bit is play necessary synchronization conspectus.For playing Bit data, should make the frequency consistent with phase place (this is called synchronization (synchronization)) of input data frequency and phase place and sampling clock in the frequency analog waveform.This forms by phase-locked loop (PLL).Exist the difference of common input data frequency and sampling frequency.The big more synchronization of this species diversity is impossible more, perhaps for taking long to synchronously.Before making synchronization, because data can not play, institute is so that synchronization when taking a long time, and the data in its time also can't be play, and descend so read the performance of channel.Be that the circuit that detects the input data frequency is added in the phase-locked loop.First-selection by detecting frequency, reduces the laggard line phase control of input data frequency and sampling frequency difference.

Fig. 2 is the piece figure of typical frequencies detection line and phase place permanent haulage line, and the first-selected frequency simulating signal that reads CD 207 in light picker 200 is converted to numerical data through analogue-to-digital converters (ADC) 201.It is first interim that the frequency analog waveform is imported, because can't correctly learn the composition of input data frequency, so pass through the loop filter 203 of frequency detecting device 202 and frequency detecting device, reduces sampling frequency and the difference of importing data frequency.This radio-frequency component after frequency detecting is finished, by the phase-locked loop, reduces phase number by frequency shift (FS) input voltage control generator (VCO) 206.The phase-locked loop is by the loop filter 205 of phase detection device 204 and phase detection device, and the voltage-controlled oscillator 206 of sampling clock or generation clock composition constitutes.

This, for the frequency detecting of conventional radio frequency signal, need the suitable time of cost.

Summary of the invention

The present invention proposes for addressing the above problem just, a kind of optical recorder that utilizes dither signal to detect reading channel frequency is provided, purpose is to utilize and CD-R/RW, DVD+-R/RW, BD-R/W similarly writes down with the dither signal that exists in the CD, infer the Bit data incoming frequency of input channel, accelerate to read the synchronization in the channel, and improve accuracy.

In addition, the player method that utilizes dither signal to detect the optical recorder of reading channel frequency provided by the invention, purpose is to utilize dither signal, infers the Bit data incoming frequency of input channel, accelerates to read the synchronization in the channel, and improves accuracy.

To achieve these goals, the present invention utilizes the optical recorder formation of dither signal detection reading channel frequency to comprise: the dither signal that writes down in the detection optical recording media and the light picker of radio frequency (RF) signal; The dither signal that detects in the generation light picker and the frequency detecting device of synchronizing signal; Utilize dither signal and synchronizing signal, calculate the frequency information conversion equipment of the radio frequency analog waveform frequency information in the channel that reads; And utilize the radio frequency analog waveform frequency information of calculating, control the phase control device of radiofrequency signal phase place.

In the present invention, its formation of frequency detecting device comprises: the analog dither signal that light picker is detected is carried out digitized dither signal analogue-to-digital converters; Remove the noise of above-mentioned digitizing dither signal, only pass through signal effectively, extract the signal processing apparatus of shake data; Generate the shake data of above-mentioned extraction and the phase-locked loop of synchronizing signal.

In addition, in the present invention, the player method that utilizes dither signal to detect the optical recorder of reading channel frequency comprises the steps: that (a) detects dither signal, utilize dither signal, the control disk rotation speed makes the shake frequency of phase-locked loop and the dither signal synchronised of phase place and above-mentioned detection; (b) signal frequency that generates in above-mentioned disk rotation speed and the phase-locked loop is fixed as certain numerical value; (c) output signal frequency of above-mentioned definite phase-locked loop is converted to reading channel frequency, provides to phase control device; (d) utilize reading channel frequency information, make input data and phase-lockingization, carry out bit and play.

In the present invention, when the signal frequency that step (b) generates in disk rotation speed and phase-locked loop is not fixed as a given data, step (b) repeatedly.

Effect of the present invention:

Identical with the above, have following effect according to optical recorder and the player method thereof that utilizes dither signal to detect reading channel frequency of the present invention:

Utilize and CD-R, DVD+-R/RW, the similar record of BD-R/W is inferred incoming frequency Bit data incoming frequency with the dither signal that exists in the CD, can reach the synchronization of reading in the channel fast and accurately.

In addition, this algorithm is because use the influence of disc types very few to record, so can relatively easily realize.

For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.

Description of drawings

Fig. 1 is a recording type optical disc dither signal organigram;

Fig. 2 only utilizes the frequency detecting method of frequency waveform and the piece figure of phase-locked loop (loop);

Fig. 3 is that the embodiment of the invention utilizes dither signal to detect the optical recorder piece figure of reading channel frequency;

Fig. 4 is that the light picker of the embodiment of the invention constitutes synoptic diagram;

Fig. 5 is the shake phase-locked loop piece figure of the embodiment of the invention;

Fig. 6 is the formation synoptic diagram of the pulse-voltage generation circuit of the embodiment of the invention;

Fig. 7 is that one embodiment of the invention is utilized dither signal, and the synchronizable optical pen recorder reads the method flow diagram of channel.

The symbol description of major part in the accompanying drawing

301: the dither signal analogue-to-digital converters

302: signal processing apparatus 303: the phase-locked loop is used in shake

304: the frequency information conversion equipment

305: the radiofrequency signal analogue-to-digital converters

306: radio frequency phase detection device 307: loop filter

308: radio frequency is with voltage-controlled oscillator 501: the shake phase detectors

502: charge pump 503: loop filter

504: voltage-controlled oscillator

Embodiment

Below with reference to accompanying drawings the optical recorder of dither signal detection reading channel frequency and the embodiment of player method thereof of utilizing of the present invention is elaborated.Below each figure constitute to require additional reference marks to be arranged, even on different figure, label, also can use same identical symbol, for well-known function be formed in here and do not elaborate for same inscape.

Fig. 3 is a dither signal of utilizing the embodiment of the invention, detects the optical recorder piece figure of channel frequency.

In an embodiment, the optical recorder formation comprises: light picker 300, frequency detecting device 30, frequency information conversion equipment 304 and phase control device 31.

Said frequencies pick-up unit 30 comprises: dither signal analogue-to-digital converters (ADC) 301; Signal processing apparatus 302; Dither signal is used phase-locked loop (PLL) 303.Above-mentioned phase control device 31 comprises: radiofrequency signal analog-digital conversion equipment (ADC) 305, phase detection device 306, loop filter 307 and voltage-controlled oscillator (VCO) 308.

The foregoing description, expression summarily utilizes dither signal, behind the synchronized signal, utilizes it when bit is play in the broadcast frequency detecting device 30, makes the system of sampling frequency and phase-lockingization.

Above-mentioned optical recorder constitutes the synchronous part of input data and sampling frequency by learning the part of frequency information by shake and utilizing chattering frequency to learn input data frequency information in reading channel.This constructive method can be for analog-and digital-.

First-selection with in the CD 10, for obtaining CD 10 rotational speeies and a plurality of information, is utilized dither signal at record, with the shake synchronised on itself and the CD 10.In this synchronizing process, can obtain the rotational speed and the chattering frequency information of CD 10.After this for playing Bit data on the CD 10, in reading channel, during with this synchronization, utilize this frequency information, read the channel phase-locked loop with frequency shift (FS), can be synchronous fast.

Be illustrated operating particularly with reference to Fig. 3, Fig. 4.Fig. 4 is that the light picker of the embodiment of the invention constitutes synoptic diagram.

Above-mentioned optical take-up apparatus 300 includes various opticses, laser diode and optical diode (photodiode) etc., and stationary installation and the irradiates light drive unit that reads information of supporting him.In drive unit, object lens are installed, fixed part is connected by optical characteristics, laser is radiated on the information pits on the CD 10 by optical instrument, the light of contact is according to information pits on the CD 10 and have or not and receive the light reflect, this is converted into optical signalling, in addition, according to the signal of giving by the way by luminous on CD 10 recorded information.

Jitter simulation signal and the radio frequency analog signal of above-mentioned optical take-up apparatus reading and recording on CD 10, record at first obtains CD signal by shake with under CD 10 situations, because control CD 10, so the priority processing dither signal.

Above-mentioned light picker is divided into two parts substantially.Being mainly light picker part and regulator forms.The light picker part mainly is equipped with opticses such as laser diode 402, optical diode 401, collimating mirror 406, light distributor 405, catoptron 408; And regulator can make object lens 407 focuses correctly track information.Fig. 4 is a DVD-ROM light picker synoptic diagram, and DVD-ROM is with under the optical take-up apparatus situation, for keeping the interchangeability with existing C D-ROM, often uses two laser diodes 402.Optical path in Fig. 4 under the play CD situation is, the laser of the wavelength 780nm that penetrates from laser diode 402 is by behind the light distributor 405, through semi-permeable mirror 404, by collimating mirror 406, after being converted to parallel beam simultaneously, reflect by catoptron 408, incident object lens 407 keep focus at cd-rom recording surface.From the laser of CD reflection reverse path according to incident, deviation retriever 403 by the revisal deviation, make optical diode 401 that signal take place, during DVD playing back, optical diode 401 and laser diode 402 penetrate incorporate laser, the laser that penetrates passes through the route of light distributor 405 → semi-permeable mirror 404 → collimating mirror 406 → catoptron 408 → incident object lens 407 successively, reads optical disc information.In addition, another laser path of divider 405, signal is read in imaging in the optical diode 401 that comprises in HOE409.

The dither signal that detects in the above-mentioned light picker 300 at first through dither signal analogue-to-digital converters (ADC) 301,305, is carried out digitized processing.Digitized dither signal is removed noise by signal processing apparatus 301.302 of said signal processing device are by useful signal, perhaps extract digitized dither signal (hereinafter referred to as ' shake data ').That is, in the signal conversion process, under the situation of the signal of overlapping multiple components, only extract the data of dual dither signal.Shake afterwards utilizes the shake data with phase-locked loop 303, makes the signal synchronous with dither signal, is used in the control of data recording or CD afterwards.

Fig. 5 is the shake phase-locked loop piece figure of the synchronous signal of generation and dither signal of the present invention.

In the foregoing description, shake comprises shake phase detection device 501, charge pump 502, loop filter 503 and shake voltage-controlled oscillator (VCO) 504 with the phase-locked loop.

What the foregoing description was represented is the method for the synchronous signal of optical recorder generation and dither signal.

With reference to Fig. 5, the shake data of carrying out digital conversion and signal Processing at first input to phase detection device 501.Above-mentioned shake data are as the data of pulse mode, input to charge pump 502, the adjusting output voltage with the values of disparity of the shake data of the shake data of input and input feedback before.

Charge pump 502 is according to the pulse signal of shake with phase detection device 501, and the electric charge of push-and-pull specified quantitative forms.Fig. 6 is as an embodiment of charge pump 502, according to the quantity of electric charge of pulse width of cloth output and difference, identically with the difference of such two kinds of signals comes the push-and-pull quantity of electric charge.In addition, in existing charge data,, also can improve voltage, also can descend, so carry out two kinds of operations by stages according to the difference of two signals.For improving voltage, push away as the needs electric charge, voltage be reduced and electric charge will be got rid of, draw electric charge, so be divided into two kinds of morphological operations according to the impulse code of pulse comparator.

That is,, with the identical propelling of pulse width of cloth corresponding charge amount size,, regulate output voltage thus in the charge pump by stored charge in the electric capacity of loop filter 503 or minimizing electric charge according to the symbol of number of pulses.

Above-mentioned loop filter 503 is seen the structure with low-pass filter basically, and two kinds of effects are arranged, and in the electric capacity of configuration, accumulates the electric charge of push-and-pull in charge pump, and emits at first side by side.Identical with the above, according to the output of phase detection device 501, charge pump 502 pushes away or discharges electric charge, so the quantity of electric charge of accumulation also changes.The variation of this quantity of electric charge that provides to electric capacity has been played in proportion transition jitter and has been regulated the voltage of wire connecting portion with voltage-controlled oscillator (VCO) 504.That is, loop filter 503 can change shake with voltage-controlled oscillator (VCO) 504 adjusting terminals input voltage, in addition, DC nearby other frequency signal beyond the signal because there is no need fully, so remove other frequency source.

Shake according to the voltage to the charging of loop filter 503 capacitors, changes the output signal frequency of output with voltage-controlled oscillator (VCO) 504, and frequency is according to the size of input voltage and proportional.

The output signal of this output is compared with the shake data, the loop that its difference explains over and over again once more, the shake signal of phase-locked loop 203 outputs and dither signal same frequency.

Though above make the process of synchronizing signal and be illustrated handling dither signal, but this is according to each optical recorder and also different, the shake of positional information decides disk rotation speed to important content on the CD by having, and can learn radio frequency input data frequency composition by shake.

Frequency information conversion equipment 304 utilizes from the chattering frequency composition of shake phase-locked loop output, calculates the frequency information that reads the radio frequency analog waveform in the channel.The shake of record usefulness CD and the Bit data of record are because synchronously, so it is corresponding with the chattering frequency composition to read the radio-frequency component of channel, the radio-frequency component of this calculating provides by the frequency shift (FS) of reading channel phase control device 31.

That is, the frequency information that reads channel can be obtained,, the phase-locked loop processor can be directly controlled so utilize frequency information by shake.The phase control device of Fig. 3 is same as shown in Figure 2 identical with, phase detection device 306, loop filter 307, voltage-controlled oscillator 308, and is roughly similar to the function of dither signal frequency detecting device.Just the frequency that detects by above-mentioned dither signal is offset by the initial stage and uses, and can reach synchronous so be used to detect the sampled signal of Bit data in the very fast time.

Fig. 7 utilizes dither signal of the present invention, makes the method flow diagram that reads channel synchronizationization of optical recorder.

Step 701 and step 702 are as utilizing dither signal, make shake with the synchronous process in phase-locked loop, optical take-up apparatus detects the dither signal that forms on the optical recording media inner looping, and the dither signal of above-mentioned detection generates spindle motor control signal and door (gate) signal.Utilize the dither signal of above-mentioned detection, at first, control spindle motor, the speed of decision CD rotation.In addition, the dither signal of above-mentioned input is carried out digital conversion, becomes pulse signal.The shake data that are converted to pulse signal are removed noise through certain signal Processing, export shake to and use the phase-locked loop.

Shake generates the signal that has with input jiffer data same frequency with the phase-locked loop, and above-mentioned shake data are compared with the signal of input and output before, and the difference of signal inputs to charge pump with certain numerical value.Charge pump is according to the quantity of electric charge of electric charge in the number of pulses regulating loop wave filter, and the quantity of electric charge of above-mentioned electric capacity is the input value of shake with voltage-controlled oscillator, and output has the signal of certain frequency.Carry out repeatedly till when signal frequency that this stage exports in shaking with the phase-locked loop and dither signal Frequency Synchronization.Above-mentioned signal and phase-locked loop Frequency Synchronization, phase-locked loop output has the signal with above-mentioned dither signal same frequency source, and certainly, if the dither signal change, above-mentioned phase-locked loop changes to the frequency source identical with changing dither signal thus.

Step 703 as the process of dither signal frequency inverted is and the dither signal Frequency Synchronization of above-mentioned detection, will generates the process that signal frequency is converted to reading channel frequency.The composition of reading channel frequency is because corresponding with the chattering frequency composition, so conform to each optical recorder, the frequency of synchronizing signal is changed.This conversion method is utilized conversion table, carries out man-to-man corresponding conversion.

Step 704 is the channel information that utilizes above-mentioned detection as the phase-detection process, detects the stage of radiofrequency signal phase place.The frequency information of above-mentioned 403 conversions is input as the initial stage shift value of phase control device.

Whether synchronous step 705 read the process of phase place in the channel phase control device as detection, and the frequency numerical value that detects in dither signal detects the phase place of radiofrequency signal as shift value.

Step 706 is to read channel synchronization process (tracing mode), the phase place arrangement of said frequencies signal is certain numerical value, like this, phase control device makes the certain phase number of arrangement and the phase place synchronised of input value, reads synchronization signal and carries out the bit broadcast.

According to aforesaid way, in dither signal and spindle motor steady state (SS), obtain frequency information, in reading channel, utilize this, so only utilize the time of radio frequency analog wave test frequency just can shorten greatly, thus, record with in the CD not posting field be the next record zone when reading frequency shorten greatly detection time, thus, the efficient of bit ability to play is read in raising.

Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.

Claims (4)

1, a kind of optical recorder that utilizes dither signal to detect reading channel frequency is characterized in that comprising:

The dither signal that writes down in the detection optical recording media and the light picker of radiofrequency signal;

The dither signal that detects in the generation light picker and the frequency detecting device of synchronizing signal;

Utilize dither signal and synchronizing signal, calculate the frequency information conversion equipment of the radio frequency analog waveform frequency information in the channel that reads; And

Utilize the radio frequency analog waveform frequency information of calculating, the phase control device of control radiofrequency signal phase place.

2, the optical recorder that utilizes dither signal to detect reading channel frequency as claimed in claim 1 is characterized in that described frequency detecting device comprises:

The analog dither signal that light picker is detected is carried out digitized dither signal analogue-to-digital converters;

Remove the noise of the digitizing dither signal of above-mentioned analogue-to-digital converters, only pass through signal effectively, extract the signal processing apparatus of shake data;

Generate the loop, phase-locked loop of the shake data and the synchronizing signal of above-mentioned extraction.

3, a kind of player method that utilizes dither signal to detect the optical recorder of reading channel frequency is characterized in that comprising the steps:

(a) detect dither signal, utilize dither signal, the control disk rotation speed makes the shake frequency of phase-locked loop and the dither signal synchronised of phase place and above-mentioned detection;

(b) signal frequency that generates in above-mentioned disk rotation speed and the phase-locked loop is fixed as certain numerical value;

(c) output signal frequency of above-mentioned definite phase-locked loop is converted to reading channel frequency, provides to phase control device;

(d) utilize reading channel frequency information, make input data and phase-lockingization, carry out bit and play.

4, the player method that utilizes dither signal to detect the optical recorder of reading channel frequency as claimed in claim 3 is characterized in that:

When the signal frequency that described step (b) generates in disk rotation speed and phase-locked loop is not fixed as a given data, step described (b) repeatedly.

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