CN1003816B - Magnetic recording/reproduction apparatus - Google Patents
Magnetic recording/reproduction apparatus Download PDFInfo
- Publication number
- CN1003816B CN1003816B CN85104162.0A CN85104162A CN1003816B CN 1003816 B CN1003816 B CN 1003816B CN 85104162 A CN85104162 A CN 85104162A CN 1003816 B CN1003816 B CN 1003816B
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- level
- signal
- reproduction apparatus
- magnetic recording
- recording
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- Signal Processing For Digital Recording And Reproducing (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
Abstract
The present invention relates to a magnetic recording/reproduction apparatus. The present invention comprises a recording part, a replaying part and a memory part, wherein the is used for recording an input signal to a tape and changing the input signal level gradually and orderly; the replaying part is used for replaying the signal from the tape and detecting the signal level at a presetting time to detect a maximal replaying level; the memory part is used for storing the recording level of the recording part when the maximal replaying level is achieved. The recording level can be automatically adjusted to the optimal recording level by the magnetic recording/reproduction apparatus.
Description
The present invention relates to a kind of magnetic recording/reproduction apparatus, particularly relate to the magnetic recording/reproduction apparatus that can be adjusted to recording level automatically the best titime level.
When magnetic recording/reproduction apparatus need obtain tape and wants the best titime level of tracer signal, existing market practice is, the characteristic of measurement standard tape in advance, so that obtain a setting value of recording level, add a reference signal then, and adjust a semi-fixed resistor, so as to adjusting the input of record amplifier, make the record current of magnetic head reach above-mentioned setting value.
Classic method needs a large amount of complicated manual operationss, and net result makes the production cost of equipment increase.Because classic method relies on mechanical adjustment, the result is easily along with the time changes again.In addition, classic method can not make full use of the performance of different qualities tape.
The present invention solves the problems referred to above with a kind of like this structure, it be contain on one side with signal frequency modulation be recorded on the tape.Little by little change the pen recorder of incoming signal level on one side successively,, it is characterized in that providing the device of test signal from tape to pen recorder with the replay device that signal is reset and; Be given in the circuit of predetermined running gain variables control signal constantly from a control circuit; Detect the replay signal level in the moment of allocating in advance, so that detect the detecting device of a maximum playback levels, be stored in the memory storage of the respective record level of the moment pen recorder that obtains maximum playback levels, take this to set a same level of recording level and carry out new record as the best titime level with storage.Introduce a kind of embodiment of the present invention below in conjunction with accompanying drawing.
Recently, with the television receiver of digital signal processing TV signal develop (such as with reference to " Nikkei Electronic ", 1981*ov23, P:233-247).Device of the present invention can be used on the magnetic recording/reproducing apparatus that carries out digital signal processing above.During record, as Fig. 1 〈 ﹠﹠ 〉, be added in the signal of 1 end, add 〈 ﹠﹠ with amplifier 2〉become digital signal with a-d converter 3 then and be added to again on the digital processing circuit 4, there, every kind of operation for example resembles separating of luminance signal and carrier frequency color signal, the FM modulation, the frequency transformation of carrier frequency colour signal, APC, ACC, how predistortion and some other similar operations carry out with digital signal, this is that everybody knows in the prior art, with D-A transducer 5 digital signal is become simulating signal then, amplified, be recorded on the tape 8 with magnetic head 7 again with amplifier 6.
On the other hand, the situation of playback time is then as shown in Fig. 1 (B), magnetic head 7 is carried out preposition amplification from tape 8 duplicated picture intelligences with prime amplifier 9, become with a-d converter 10 and to be added to signal processing circuit 11 after the digital signal and to get on, there, every kind of operation, as if brightness FM signal separates with the carrier frequency colour signal, FM modulation, the frequency transformation of carrier frequency colour signal, APC, ACC corrects and removes, and how noise limit and some other similar operations carry out with digital signal, this is that everybody knows in the prior art, is simulating signal 13 taking-ups from the termination again with D-A transducer 12 again with digital signal then.
Fig. 2 (A) and Fig. 2 (B) are respectively register system and the playback system calcspars in the magnetic record/replay device that makes according to the present invention.The circuit of numbering 14 is a kind of control circuits, its ratio of components is as being a CPU or other similar circuit, the operation that it carries out can be deleted programming ROM according to being stored in the EEPROM(electricity) program in 22 such storeies, carry out in proper order according to block diagram shown in Figure 3.Even the data content among the EEPROM can not lost when dump yet.
By Fig. 2 (A) when mode writes down, by interface 18 from taking out the control signal a shown in Fig. 4 (A) the control circuit 14, cut off 50th step of on-off circuit 15(at Fig. 3) disconnecting signal from a-d converter 3, and replace the 51st step at Fig. 3 by interface 19() CF signal (test signal) of taking out a 5MHz.Test signal is added to by totalizer 16 carries out the FM modulation on the middle FM modulator 4a of signal processing circuit 4, be transformed to simulating signal with D-A transducer 5 then and be added to voltage-adjusting amplifier 17 again.
At this moment according to the control section 14 working time in the control circuit 14
2The working time of distributing is from gain variables part 14
1Take out the gain variables control signal, it is become simulating signal, be re-used as and control voltage and be added on the voltage-adjusting amplifier 17 by interface 20 usefulness D-A transducers 21.So the gain of voltage-adjusting amplifier 17 is just by progressively change (in the 52nd step); Like this, it is can be stepping that the recording level of test signal just is made to, and is recorded on the tape 8, such shown in Fig. 4 (B).
Except that above-mentioned embodiment, Fig. 5 (A) can be used for also that with the circuit shown in Fig. 5 (B) test signal level is become can be stepping.Such structure division is arranged in the circuit of Fig. 5 (A), D-A transducer 24 is connected across between the amplifier input-output end in this structure, it is that the gain variables control signal that available memory 22 takes out makes it to change that its resistance (it is actually a negative feedback resistor) value is made to, it is variable so just can making the gain of amplifier 23, again the output of taking out amplifier 23 by record amplifier 25.Such structure division is arranged in the circuit of Fig. 5 (B), to be made to be that the gain variables control that available memory 22 takes out makes it to change to the resistance value of D-A transducer 26 in this structure, it is variable so just can making incoming signal level, again the output of taking out D-A transducer 26 by record amplifier 25.
Press the mode playback time of Fig. 2 (B), be used for making record have the tape 8 of test signal to reverse, and this signal replication got off (in the 53rd step) from the tape reversing control signal of controlling circuit 14.The waveform that output level shows is such as shown in Fig. 4 (C) that.
Enclosing a field except the recording level that makes when record with the signal a shown in Fig. 4 (A) as drum pulse becomes in time phase the variable this method, in order to carry out record, with several as a unit, recording level is enclosed in these several fields becomes variable this point in time phase, also be possible.
The above, the magnetic recording/reproduction apparatus that makes according to the present invention comprises several like this parts: pen recorder is used for making the recording level of input signal to become can changing successively step by step, and it is recorded on the tape; Replay device is used for signal is reset from tape, and in detection signal level of the ready-portioned moment in advance, so that detect a maximum playback levels; Memory storage is used for being stored in the respective record level of the moment pen recorder that obtains maximum playback levels as the best titime level.So this device of the present invention can be provided with the best titime level automatically; Compare with the existing apparatus that the semi-fixed resistance of resonance-amplifier input usefulness need be adjusted, can reduce trouble and manual operations; Cost also can reduce; The influence that the time that is not subjected to changes, submode is regulated because apparatus of the present invention are electricity consumption; And the best titime level can be set, be complementary with characteristic with used tape.
Fig. 1 (A) and Fig. 1 (B) are respectively the common magnetic recording/reproduction apparatus calcspars that can carry out digital signal processing;
Fig. 2 (A) and Fig. 2 (B) are respectively the register system of apparatus of the present invention and the calcspar of playback system;
Fig. 3 is a flow chart, and it is very useful for the operational process of explaining apparatus of the present invention;
Fig. 4 (A) and Fig. 4 (C) are timing curves, and they are very useful for the operational process of explaining apparatus of the present invention;
Fig. 5 (A) and Fig. 5 (B) are respectively the calcspars of the partial devices of making by another embodiment of the present invention.
1 ... the input termination,
3 10. ... a-d converter,
5 12.21.24.26. ... the D-A transducer,
7 ... magnetic head,
8 ... tape,
14 ... control circuit,
14
2The gain-variable part
14
1The running time control section,
17. ... voltage-adjusting amplifier,
18.19.20.28. ... interface,
22. ... storer,
23.25. ... amplifier,
27. ... the sampled level detecting device.
Claims (4)
1, a kind of magnetic recording/reproduction apparatus comprises a-d converter, on-off circuit, adding circuit, be used for input signal frequency modulation be recorded on the tape, little by little change simultaneously the pen recorder of said incoming signal level successively; And be used for replay device that signal is reset and from said tape; It is characterized in that providing the device of test signal to pen recorder; Be given in the circuit of predetermined running gain variables control signal constantly from a control circuit; Detect the replay signal level in the predetermined moment, so that detect the detecting device of the playback levels of a maximum; And memory storage, be used for storing the respective record level of said pen recorder in the moment that obtains said maximum playback levels, take this to set one and carry out new record as the best titime level with the same level of recording level that stores.
2, with the magnetic recording/reproduction apparatus defined in the claim 1, wherein said control device is connected on the voltage-adjusting amplifier of pen recorder its gain is become thereupon, so that carry out record.
3, with the magnetic recording/reproduction apparatus that claim 1 was limited, wherein said control device is to connect the feedback resistance that resistance changes with gain control signal in the storer on the amplifier, so that carry out record.
4, with the magnetic recording/reproduction apparatus that claim 1 was limited, wherein said control device is connected an amplifier input terminal, and changes its incoming level with the gain variables control signal in the storer, so that carry out record.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85104162.0A CN1003816B (en) | 1985-05-31 | 1985-05-31 | Magnetic recording/reproduction apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85104162.0A CN1003816B (en) | 1985-05-31 | 1985-05-31 | Magnetic recording/reproduction apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85104162A CN85104162A (en) | 1986-11-26 |
| CN1003816B true CN1003816B (en) | 1989-04-05 |
Family
ID=4793670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85104162.0A Expired CN1003816B (en) | 1985-05-31 | 1985-05-31 | Magnetic recording/reproduction apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1003816B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0128818B1 (en) * | 1992-06-26 | 1998-04-10 | 강진구 | Camcorder which can dub character information selectively |
-
1985
- 1985-05-31 CN CN85104162.0A patent/CN1003816B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85104162A (en) | 1986-11-26 |
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