JPH0352802U - - Google Patents
Info
- Publication number
- JPH0352802U JPH0352802U JP11331189U JP11331189U JPH0352802U JP H0352802 U JPH0352802 U JP H0352802U JP 11331189 U JP11331189 U JP 11331189U JP 11331189 U JP11331189 U JP 11331189U JP H0352802 U JPH0352802 U JP H0352802U
- Authority
- JP
- Japan
- Prior art keywords
- recording
- signal
- video signal
- reproducing
- magnetic tape
- 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.)
- Pending
Links
- 230000005236 sound signal Effects 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 6
- 239000002131 composite material Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
Description
第１図はこの考案の一実施例による磁気テープ
記録再生装置の記録電流制御系の構成図、第２図
は従来の磁気テープ記録再生装置の構成図、第３
図は映像信号、ＦＭ音声信号、ＰＣＭ音声信号の
スペクトルを示すグラフ、第４図は従来の磁気テ
ープ記録再生装置の記録電流制御系の構成図、第
５図は三層記録による記録跡（記録層）の一例を
説明するための説明図、第６図は複合映像ヘツド
と複合音声ヘツドの一例を示す構成図、第７図は
磁気ヘツドのモデルを示す説明図、第８図、第９
図、第１０図は第三層のＲＦ映像信号記録電流に
対する第二層の厚さ、ＱＤＰＳＫ信号の再生スペ
クトルおよびＰＣＭ音声信号のブロツクエラーレ
ートに与える影響の一例を示す図である。
図中、１……映像信号記録処理回路、２……映
像信号記録増幅器、４……映像ヘツド、６……映
像信号再生増幅器、２６……回転トランス、２７
……切替回路、２８……電流検出抵抗器、４０…
…記録電流を検出するための検出回路、４１……
記録電流制御回路、４２……利得可変回路である
。なお、図中、同一符号は同一または相当部分を
示す。
FIG. 1 is a block diagram of a recording current control system of a magnetic tape recording and reproducing apparatus according to an embodiment of this invention, FIG. 2 is a block diagram of a conventional magnetic tape recording and reproducing apparatus, and FIG.
The figure is a graph showing the spectra of a video signal, FM audio signal, and PCM audio signal. Figure 4 is a configuration diagram of the recording current control system of a conventional magnetic tape recording and reproducing device. Figure 5 is a graph showing the recording traces (recorded FIG. 6 is a configuration diagram showing an example of a composite video head and a composite audio head. FIG. 7 is an explanatory diagram showing a model of a magnetic head. FIGS.
10 are diagrams showing an example of the influence of the thickness of the second layer on the RF video signal recording current of the third layer, the reproduction spectrum of the QDPSK signal, and the block error rate of the PCM audio signal. In the figure, 1...Video signal recording processing circuit, 2...Video signal recording amplifier, 4...Video head, 6...Video signal reproducing amplifier, 26...Rotating transformer, 27
...Switching circuit, 28...Current detection resistor, 40...
...Detection circuit for detecting recording current, 41...
Recording current control circuit, 42...variable gain circuit. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.
Claims (1)
とを合成した映像信号を磁気テープに記録し再生
する手段と、音声信号をデイジタルデータに変換
するとともに位相変調して上記磁気テープに記録
し再生する手段と、音声信号を周波数変調して上
記磁気テープに記録し再生する手段とを備え、周
波数変調された音声信号、位相変調された音声信
号、映像信号の順に重ね記録する回転ヘツド形の
磁気テープ記録再生装置において、上記映像信号
の同期信号部分に対応した記録電流を検出する電
流検出手段と、上記電流検出手段の検出結果に基
づき上記映像信号の記録電流を所定の値に制御す
る映像信号記録電流制御手段とを備えたことを特
徴とする磁気テープ記録再生装置。 Means for recording and reproducing on a magnetic tape a video signal that is a combination of a frequency-modulated luminance signal and a low-frequency-converted color signal, and converting an audio signal into digital data and phase modulating it, and recording and reproducing it on the magnetic tape. and a means for frequency modulating an audio signal, recording and reproducing it on the magnetic tape, and for recording a frequency modulated audio signal, a phase modulated audio signal, and a video signal overlappingly in this order. In the recording and reproducing apparatus, current detection means detects a recording current corresponding to a synchronization signal portion of the video signal, and video signal recording controls the recording current of the video signal to a predetermined value based on the detection result of the current detection means. 1. A magnetic tape recording and reproducing device comprising: current control means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11331189U JPH0352802U (en) | 1989-09-27 | 1989-09-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11331189U JPH0352802U (en) | 1989-09-27 | 1989-09-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0352802U true JPH0352802U (en) | 1991-05-22 |
Family
ID=31661728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11331189U Pending JPH0352802U (en) | 1989-09-27 | 1989-09-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0352802U (en) |
-
1989
- 1989-09-27 JP JP11331189U patent/JPH0352802U/ja active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS61289780A (en) | Video reproducing device | |
| JPH0352802U (en) | ||
| JPH0352801U (en) | ||
| JPH0352803U (en) | ||
| JPS619976U (en) | FM audio recording VTR | |
| JPS6121006U (en) | Dropout compensation device for magnetic recording and reproducing equipment | |
| JPH075555Y2 (en) | Digital signal reproducing device | |
| JPH01156672U (en) | ||
| JPS60216679A (en) | magnetic recording and reproducing device | |
| JPH0282183U (en) | ||
| JPH053195B2 (en) | ||
| JPS6415359U (en) | ||
| JPH0316001A (en) | Magnetic recording and reproducing device | |
| JPH0227501A (en) | Video tape recorder | |
| JPH03121501U (en) | ||
| JPH01181111U (en) | ||
| JPS61288672A (en) | Video signal recording and playback device | |
| JPH01152877A (en) | Fade-in fade-out device | |
| JPH0520605A (en) | Multiple magnetic recording / reproducing device | |
| JPS6415360U (en) | ||
| JPH0380560U (en) | ||
| JPS5942517U (en) | magnetic recording and reproducing device | |
| JPS62198559U (en) | ||
| JPH03269802A (en) | Magnetic recording and reproducing device | |
| JPH0235301U (en) |