CN1003817B - Pulse encoding modulation type record regeneration device - Google Patents
Pulse encoding modulation type record regeneration device Download PDFInfo
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- CN1003817B CN1003817B CN85104394.1A CN85104394A CN1003817B CN 1003817 B CN1003817 B CN 1003817B CN 85104394 A CN85104394 A CN 85104394A CN 1003817 B CN1003817 B CN 1003817B
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Abstract
The present invention relates to a pulse encoding modulation type recording regeneration device. Main signals on a tape, which are composed of analog signals, are sampled and quantified to be converted to digital signals, which are recorded. Meanwhile, the main signals and auxiliary signals used for representing the position of the tape are recorded. The present invention has the advantages that the main signals and the auxiliary signals used for representing the absolute position of the tape are recorded on the same magnetic track according to the time division, and accordingly, only few magnetic heads are necessary to record, and the magnetic tracks on the tape can be effectively used.
Description
The present invention relates to pulse code modulation (pcm) formula record regenerator, this device can carry out simulating signals such as audio signal or vision signal digital conversion and in enterprising line item of tape and regeneration.
In general, this record regenerator digital signal (main signal) that analog signal conversion such as audio signal or vision signal can be become and the auxiliary signal representing the absolute position of tape and be used for high speed recall signal etc. are noted simultaneously.As shown in Figure 1, in the past then with this main signal D
1With auxiliary signal D
2Be recorded on the different magnetic tracks.
Therefore, this device in the past has more following shortcomings, and promptly the quantity of magnetic head increases, and it is complicated that circuit becomes, and because the track number on the tape increases, the position relation of tape and magnetic head is necessary more accurate etc.
The present invention is in view of in the past above-mentioned shortcoming, the device that is provided can with main signal and auxiliary signal at regular intervals cutting recording on same magnetic track, thereby can increase track number, and when recorded information, can not reduce record efficiency yet.
Other purpose of the present invention and range of application can fully be understood from following elaboration.Yet should know, owing to be well understood to during from then on many changes and improvements that do not break away from essence of the present invention and scope all can describe in detail one of ordinary skill in the art, so its detailed description and special example provide preferred embodiment of the present invention simultaneously only by graphic extension.
To achieve the above object, pulse encoding modulation type record regeneration device as one embodiment of the invention, the main signal that is made of simulating signal is taken a sample, quantize, thereby be converted to digital signal and note, meanwhile, the auxiliary signal of this main signal and expression tape location is noted simultaneously, this device is made of following column circuits, above-mentioned main signal is carried out digitized numerical coding circuit, to set hiding from view during hiding from view by the resulting above-mentioned digital main signal of this numerical coding circuit during, produce circuit, produce the oscillatory circuit of reference clock, having of producing during above-mentioned the hiding from view that circuit sends here carried out the time-division after main signal during hiding from view and the input of above-mentioned auxiliary signal to be driven, and insert the signal synthesis circuit device of the above-mentioned auxiliary signal of output in during the hiding from view of above-mentioned main signal, and, it is characterized in that: the moment data generating circuit that produces the above-mentioned auxiliary signal of representing that above-mentioned tape location is used according to the said reference clock the writing circuit of signal record on the same magnetic track of above-mentioned tape that obtains in this signal synthesis circuit device.
From following elaborate with accompanying drawing can fully understand the present invention, therefore accompanying drawing only plays the diagram effect does not have restricted to the present invention.
Fig. 1 represents the tape formats sketch with in the past record regenerator record, and Fig. 2 and Fig. 3 represent the register system in the record regenerator of the present invention and the circuit block diagram of regenerative system, and Fig. 4 represents the record format figure with apparatus of the present invention record.
Below with reference to the accompanying drawings one embodiment of the present of invention are described in detail.
Fig. 2 represents the register system circuit in the record regenerator of the present invention, and 1 is input terminal among the figure, it accept main signals such as audio signal or vision signal still without the simulating signal of pulse code modulation (pcm); 2 is the numerical coding circuit, it is taken a sample this main signal according to definite sampling frequency, after quantizing simultaneously to become definite figure place, carry out staggered again, processing such as error-correcting code and appended synchronization signal: the 3rd, as the time shaft compressor circuit that produces circuit during hiding from view, it carries out the time shaft compression with numerical coding circuit 2 above-mentioned main signals handled and digitizing (pulse code modulation (PCM) PCM), and during setting is hidden from view in main signal; 4 is modulation circuit, and it becomes the waveform that is easy to be recorded on the tape with time shaft compression and the main signal modulation that is provided with during hiding from view, and the output of this modulation circuit should be presented the terminal 51 to the switch in the time division circuit 5 50.
By becoming to not carrying out the high speed transfer rate (recording density) of high rapid regeneration of these modulation circuit 4 outputs through the code modulated main signal of pulse.
6 for the oscillatory circuit that reference clock is used takes place, and the reference clock of its output is presented respectively to moment data generating circuit 7 and above-mentioned numerical coding circuit 2 and time shaft compressor circuit 3.
Above-mentioned moment data generating circuit 7 utilizes the counter of dress in it that said reference clock number is counted, and carries out locking as moment data output every the regular hour.
These moment data become with present moment represents position auxiliary signal that use and that have high speed retrieving information function on the tape T, for example, if write on tape every 100 milliseconds, then uses quantity of information seldom just passable.
In addition, above-mentioned commutation pulse produces circuit 8 and is controlled by above-mentioned time shaft compressor circuit 3, when the main signal data that the 3 output time axial compressions of time shaft compressor circuit are contracted, the switch 50 of time division circuit 5 is switched on the terminal 51, in addition, at time shaft compressor circuit 3 not in the blanking time of output signal data, above-mentioned switch 50 is switched on the switch 52 with the changeover control signal of generation time partitioning circuitry 5 respectively.
The changeover control signal that utilizes this commutation pulse generation circuit 8 to be exported carries out conversion and control to time division circuit 5, thereby in this time division circuit 5, by in during the hiding from view of above-mentioned modulation circuit 4 resulting each main signal, so that two signals are synthesized, writing circuit 9 and the magnetic head 10 by next stage is recorded on the tape T then by moment data generating circuit 7 resulting auxiliary signals in insertion.
Fig. 4 illustrates by above register system circuit and is recorded in the main signal on the tape T and the record format example of auxiliary signal, at each magnetic track 1
1To 1
nLast main signal D
1With auxiliary signal D
2The time of carrying out is cut apart interleaved recorded respectively to reach synchronizing signal S.
In addition, in order to carry out the above-mentioned auxiliary signal D of high rapid regeneration
2It writes down with low recording density, therefore, when common constant speed regeneration, main signal D
1With auxiliary signal D
2Can regenerate, and when high rapid regeneration, have only auxiliary signal to regenerate.
The following describes regenerative loop of the present invention shown in Figure 3.
11 is reproduce head, and 12 for amplifying the above-mentioned main signal D that this reproduce head 11 is picked up
1With auxiliary signal D
2Regenerative amplifier, 13 is waveform shaping circuit, it becomes the laggard line output of digital signal of the required waveform of demodulation, main signal anti-processing the when next stage writes down in these waveform shaping circuit 13 resulting signals with regenerative amplifier 12 resulting above-mentioned main signals and auxiliary signal shaping.
That is to say, utilize demodulator circuit 14 to carry out demodulation, utilize time shaft expanded circuit 15 to expand after, utilize digital decoder 16 to carry out error recovery again, carry out D/A switch simultaneously, make it to become original analog signal.
In addition, utilize the moment data decoder 17 of next stage to read, and utilize display circuit 18 that the moment (present moment) of the present position of tape is carried out moment demonstration by the auxiliary signal in the above-mentioned waveform shaping circuit 13 resulting signals.
19 is moment initialization circuit, can operate the keyboard shown in the figure, should stop maybe to enter the moment that the position is determined in constant speed regeneration if set corresponding to tape T, the then exportable setting corresponding with it moment data.
20 is judging circuit, it is only when being obtained setting constantly data by above-mentioned moment initialization circuit 19, the tape present moment data of these data and 17 outputs of above-mentioned moment data decoder are compared, data are also little constantly if the present moment data are than setting, and then will present the motor-drive circuit 21 that (FF) signal is sent into next stage at a high speed; Data are also big constantly if the present moment data are than setting, and then back-roll (REW) signal is sent into the motor-drive circuit 21 of next stage at a high speed, with drive motor 22, tape T is rewound or present forward.
And when two data consistents, 20 of judging circuits will stop or the constant speed regenerated signal is exported to motor-drive circuit 21, so that circuit machine 22 stops or the constant speed rotation.
In the regenerative system circuit that as above constitutes, when constant speed is regenerated,,, and make tape T carry out the constant speed tape transport so motor-drive circuit 21 just can make motor 22 carry out the constant speed rotation thereupon because initialization circuit 19 is not exported setting data constantly constantly.
Therefore, by the constant speed tape transport of tape T, reproduce head 11 is with main signal D
1With auxiliary signal D
2After the regeneration, send into waveform shaping circuit 13 by regenerative amplifier 12, pass through wave shaping therein after, present to demodulator circuit 14 and data decoder 17 constantly.
As mentioned above, after signal (main signal) the elapsed time axle expanded circuit 15 and digital decoder 16 in the input demodulator circuit 14, be converted into original audio signal (simulating signal), in addition, signal (auxiliary signal=present moment data) in the input time data decoder 17 is presented to display circuit 18, in order to show the moment of expression tape T present position.
In addition, on the other hand, in moment initialization circuit 19, set tape T and go up the moment data of wanting regenerating section to begin, when representing that by the output of this circuit 19 its setting constantly is constantly during data, record regenerator just enters high speed reproduced state (utilized originally the action of motor-drive circuit 21 rewind or present forward), judging circuit 20 be set constantly data and constantly the size of data compare.For example, when the former was big, the signal that will rewind was presented to motor-drive circuit 21 with driving motor 22, made tape T carry out the high speed tape transport that rewinds.
Walk under the carrier state in the high speed that this high speed back-roll tape transport produces, because the problems such as frequency characteristic of reproduce head 11, the main signal of high density recording can not be regenerated, even perhaps regeneration also has only small level.
In contrast to this, the auxiliary signal of low-density record can be regenerated effectively, through regenerative amplifier 12, waveform shaping circuit 13 and moment data decoder 17, and utilizes display circuit 18 can demonstrate the present position that present moment is tape T.
And when from the present moment data of moment data decoder 17 with when setting constantly data consistent, above-mentioned judging circuit 20 is just sent the constant speed regenerated signal into motor-drive circuit 21, so that motor 22 carries out the constant speed rotation and tape T carries out the constant speed tape transport.
As mentioned above, formation of the present invention has following advantage, promptly the auxiliary signal of the main signal of audio signal etc. and expression tape absolute position according to the time cutting recording on same magnetic track, therefore, available minority magnetic head carries out record, and can effectively utilize the magnetic track on the tape.
By above explanation, can find out significantly that the present invention can have many variations, the variation of these forms does not break away from essence of the present invention and scope.
Claims (1)
1, a kind of pulse code modulation (pcm) formula record regenerator, be used for and take a sample, to quantize by the main signal that simulating signal constitutes, and be converted in digital signal record gets off, the auxiliary signal of expression tape location is noted simultaneously, and this device comprises: the oscillatory circuit that produces reference clock; Above-mentioned main signal is carried out digitized numerical coding circuit; To set hiding from view during hiding from view by the resulting above-mentioned digital main signal of this numerical coding circuit during, produce circuit, carry out the time-division after main signal during hiding from view and the input of above-mentioned auxiliary signal and drive producing having of circuit during above-mentioned the hiding from view, and in during the hiding from view of above-mentioned main signal above-mentioned auxiliary signal is inserted the signal synthesis circuit device of output; And with the writing circuit of signal record on the same magnetic track of above-mentioned tape that obtains in this signal synthesis circuit device.It is characterized in that: the moment data generating circuit that produces the auxiliary signal of representing that above-mentioned tape location is used according to the said reference clock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85104394.1A CN1003817B (en) | 1985-06-10 | 1985-06-10 | Pulse encoding modulation type record regeneration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85104394.1A CN1003817B (en) | 1985-06-10 | 1985-06-10 | Pulse encoding modulation type record regeneration device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85104394A CN85104394A (en) | 1986-12-10 |
| CN1003817B true CN1003817B (en) | 1989-04-05 |
Family
ID=4793816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85104394.1A Expired CN1003817B (en) | 1985-06-10 | 1985-06-10 | Pulse encoding modulation type record regeneration device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1003817B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1035290C (en) * | 1993-12-14 | 1997-06-25 | 沈阳汇通电子研究所 | Multichannel optical disk time sound recording system |
-
1985
- 1985-06-10 CN CN85104394.1A patent/CN1003817B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85104394A (en) | 1986-12-10 |
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