JPS6123589B2 - - Google Patents
Info
- Publication number
- JPS6123589B2 JPS6123589B2 JP10354080A JP10354080A JPS6123589B2 JP S6123589 B2 JPS6123589 B2 JP S6123589B2 JP 10354080 A JP10354080 A JP 10354080A JP 10354080 A JP10354080 A JP 10354080A JP S6123589 B2 JPS6123589 B2 JP S6123589B2
- Authority
- JP
- Japan
- Prior art keywords
- signal
- magnetic tape
- track
- input
- outputs
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000005236 sound signal Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/22—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing distortions
- G11B20/225—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing distortions for reducing wow or flutter
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
Description
【発明の詳細な説明】
本発明は、磁気テープにおける雑音除去装置に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a noise removal device for magnetic tape.
従来、入力信号を角度変調して磁気テープに記
録して再生し、復調して出力する装置において
は、磁気テープ録音再生器において生じるワウ・
フラツタが再生出力に雑音として現われてしまつ
た。 Conventionally, in devices that angle-modulate an input signal, record it on a magnetic tape, play it back, demodulate it, and output it, the wah noise that occurs in the magnetic tape recording/playback device has been affected.
The flutter appeared as noise in the playback output.
本発明の目的は、磁気テープの第１トラツクに
被変調信号を記録し、第２トラツクに無変調信号
を記録して、これらの復調信号の差をとることに
より、ワウ・フラツタにより生じる雑音を除去す
る装置を提供することにある。 An object of the present invention is to record a modulated signal on the first track of a magnetic tape, record an unmodulated signal on the second track, and take the difference between these demodulated signals to eliminate noise caused by wow and flutter. The object of the present invention is to provide a device for removing such substances.
本発明の要旨は、第１の角度変調器の入力端子
に入力信号を受け、第２の角度変調器の入力端子
に搬送波である無変調信号を受けて、前記角変調
器の出力である被変調信号を磁気テープの第１ト
ラツクに記録し、前記無変調信号を前記磁気テー
プの第２トラツクに記録して、前記磁気テープの
第１トラツクおよび第２トラツクに記録された信
号を再生して得られる第１および第２の再生出力
信号を位相比較器を介して取り出す装置にある。 The gist of the present invention is to receive an input signal at an input terminal of a first angle modulator, receive an unmodulated signal which is a carrier wave at an input terminal of a second angle modulator, and receive a signal which is an output of the angle modulator. Recording a modulated signal on a first track of the magnetic tape, recording the unmodulated signal on a second track of the magnetic tape, and reproducing the signals recorded on the first track and the second track of the magnetic tape. The present invention is a device for extracting the obtained first and second reproduced output signals via a phase comparator.
以下、本発明に係る実施例を第１図に示す。 An embodiment according to the present invention is shown in FIG. 1 below.
図において、１０は発振器であり、一定周波数
かつ一定振幅の搬送波である無変調信号S0を出力
する。２０は変調器であり、第１の入力端子に入
力信号S1たとえば音声信号が入力され、第２の入
力端子に前記無変調信号S0である搬送波が入力さ
れて、前記搬送波が前記入力信号S1により周波数
変調されて被変調信号S2を出力する。３０は磁気
テープ録音再生器であり、磁気テープの第１トラ
ツク３１に前記被変調信号S2を記録し、再生時に
第１の再生出力信号S3を出力し、磁気テープの第
２トラツク３２には前記無変調信号S0を記録し、
再生時に第２再生出力信号S4を出力する。前記磁
気テープ録音再生器３０の第１トラツク３１およ
び第２トラツク３２から出力される再生出力信号
S3およびS4は位相比較器４０の第１の入力端子お
よび第２の入力端子にそれぞれ入力され、位相比
較されることにより出力には前記音声信号S1と同
一の出力信号S7が得られる。 In the figure, 10 is an oscillator, which outputs an unmodulated signal S 0 which is a carrier wave of a constant frequency and a constant amplitude. 20 is a modulator, in which an input signal S1 , for example, an audio signal, is inputted to a first input terminal, a carrier wave, which is the unmodulated signal S0 , is inputted to a second input terminal, and the carrier wave is converted into the input signal S1; It is frequency modulated by S 1 and outputs a modulated signal S 2 . 30 is a magnetic tape recording/reproducing device which records the modulated signal S2 on the first track 31 of the magnetic tape, outputs the first playback output signal S3 during playback, and outputs the first playback output signal S3 on the second track 32 of the magnetic tape. records the unmodulated signal S 0 ,
A second reproduction output signal S4 is output during reproduction. Reproduction output signals output from the first track 31 and second track 32 of the magnetic tape recording/reproducing device 30
S 3 and S 4 are input to the first input terminal and second input terminal of the phase comparator 40, respectively, and the output signal S 7 , which is the same as the audio signal S 1 , is obtained by comparing the phases. It will be done.
ここで、本発明の実施例の動作説明を第２図に
基づいて説明する。 Here, the operation of the embodiment of the present invention will be explained based on FIG.
周波数変調器２０の第１の入力端子には入力信
号として音声信号S1が入力され、第２の入力端子
には発振器１０からの無変調信号S0が入力され
て、前記音声信号S1が周波数変調を受けた被変調
信号S2となつて磁気テープ録音再生器３０の第１
トラツク３１に入力される。また、前記磁気テー
プの録音再生器３０の第２トラツク３２には前記
無変調信号S0が入力される。ここで、前記磁気テ
ープ録音再生器３０においてワウ・フラツタが時
刻t1付近で生じたとすると、第１トラツク３１の
出力である再生出力信号S3は前記被変調信号S2に
対して時刻t1の付近で密あるいは粗となり、周波
数変調を受けることになる。同時に、第２トラツ
ク３２の出力である再生出力信号S4は前記無変調
信号S0に対して時刻t1の付近でワウ・フラツタに
より周波数変調を受けた形となり、同じく密ある
いは粗となる。位相比較器４０は、第２の入力端
子に入力される時刻t1付近においてワウ・フラツ
タ成分により変調を受けた搬送波である前記再生
出力信号S4を基準として、被変調信号である前記
再生出力信号S3が復調されることにより、前記出
力信号S5には前記ワウ・フラツタ成分が現われな
いことになる。 The audio signal S 1 is input as an input signal to the first input terminal of the frequency modulator 20, and the unmodulated signal S 0 from the oscillator 10 is input to the second input terminal, so that the audio signal S 1 is The frequency-modulated modulated signal S2 is output to the first magnetic tape recording/reproducing device 30.
It is input to track 31. Further, the unmodulated signal S 0 is input to the second track 32 of the magnetic tape recording/reproducing device 30. Here, if wow and flutter occur in the magnetic tape recording/reproducing device 30 near time t1 , the playback output signal S3 , which is the output of the first track 31, will be different from the modulated signal S2 at time t1. It becomes dense or coarse near , and is subject to frequency modulation. At the same time, the reproduced output signal S4 , which is the output of the second track 32, is frequency-modulated by the wow and flutter around time t1 with respect to the unmodulated signal S0 , and similarly becomes dense or coarse. The phase comparator 40 uses as a reference the reproduced output signal S4 , which is a carrier wave modulated by a wow and flutter component, near time t1 , which is input to a second input terminal, and outputs the reproduced output signal, which is a modulated signal. By demodulating the signal S3 , the wow and flutter components do not appear in the output signal S5 .
以上のように、入力信号を角度変調たとえば周
波数変調して磁気テープに記録して再生し、復調
して出力するような装置において、磁気テープ録
音再生器で発生するワウ・フラツタにより生じる
雑音を除去することができる。また、例えば、搬
送波である無変調信号S0の周波数ｆspを10KNz、
入力信号S1の周波数ｆs1を1KHzとし、磁気テー
プ録音再生器３０のヘツドの角度のズレにより生
じる再生誤差時間を１μsecとすると、で位相比
較上のズレを検知する周期が短かい為、精密かつ
正確な補正が可能である。また、入力信号として
画像信号またはデイシタルデータ信号を入力する
ことにより同様の効果を得ることができる。 As described above, in a device that angle-modulates an input signal, such as frequency-modulates it, records it on a magnetic tape, plays it back, demodulates it, and outputs it, noise caused by wow and flutter generated in a magnetic tape recording/player is removed. can do. Also, for example, if the frequency f sp of the unmodulated signal S 0 which is the carrier wave is 10 KNz,
Assuming that the frequency f s1 of the input signal S 1 is 1 KHz and the reproduction error time caused by the angle deviation of the head of the magnetic tape recording/reproducing device 30 is 1 μsec, the period for detecting the deviation in phase comparison is short. Moreover, accurate correction is possible. Further, similar effects can be obtained by inputting an image signal or a digital data signal as an input signal.
第１図は本発明の実施例のブロツク図、第２図
は本発明に係る実施例の動作波形図である。
１０：発振器、２０：周波数変調器、３０：磁
気テープ録音再生器、３１：磁気テープ録音再生
器３０の第１トラツク、３２：磁気テープ録音再
生器３０の第２トラツク、４０：位相比較器、
S0：無変調信号、S1：入力信号、S2：変調信号、
S3，S4：再生出力信号、S5：出力信号。
FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an operational waveform diagram of the embodiment of the present invention. 10: Oscillator, 20: Frequency modulator, 30: Magnetic tape recording and reproducing device, 31: First track of magnetic tape recording and reproducing device 30, 32: Second track of magnetic tape recording and reproducing device 30, 40: Phase comparator,
S 0 : Unmodulated signal, S 1 : Input signal, S 2 : Modulated signal,
S 3 , S 4 : Playback output signal, S 5 : Output signal.
Claims (1)
信号を出力する角度変調器と、 前記変調信号を第１トラツクに録音すると同時
に前記搬送波である無変調信号を第２トラツクに
録音し、前記第１および第２トラツクからそれぞ
れ第１および第２の再生出力信号を出力する磁気
テープ録音再生器と、 前記第２の再生出力信号を基準にして前記第１
の再生出力信号の位相を比較することにより復調
し、前記入力信号を出力する位相比較器とから構
成される録音テープにおける雑音除去装置。[Scope of Claims] 1. An oscillator that outputs a carrier wave, an angle modulator that angle-modulates the carrier wave with an input signal and outputs a modulated signal, and an oscillator that outputs a modulated signal as the carrier wave while recording the modulated signal on a first track. a magnetic tape recording/reproducing device for recording a modulated signal on a second track and outputting first and second reproduction output signals from the first and second tracks, respectively; 1st
and a phase comparator for demodulating by comparing the phases of reproduced output signals and outputting the input signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10354080A JPS5730107A (en) | 1980-07-30 | 1980-07-30 | Noise eliminator for recording tape |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10354080A JPS5730107A (en) | 1980-07-30 | 1980-07-30 | Noise eliminator for recording tape |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5730107A JPS5730107A (en) | 1982-02-18 |
| JPS6123589B2 true JPS6123589B2 (en) | 1986-06-06 |
Family
ID=14356669
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10354080A Granted JPS5730107A (en) | 1980-07-30 | 1980-07-30 | Noise eliminator for recording tape |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5730107A (en) |
-
1980
- 1980-07-30 JP JP10354080A patent/JPS5730107A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5730107A (en) | 1982-02-18 |
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