JPH0352803U - - Google Patents
Info
- Publication number
- JPH0352803U JPH0352803U JP11331289U JP11331289U JPH0352803U JP H0352803 U JPH0352803 U JP H0352803U JP 11331289 U JP11331289 U JP 11331289U JP 11331289 U JP11331289 U JP 11331289U JP H0352803 U JPH0352803 U JP H0352803U
- Authority
- JP
- Japan
- Prior art keywords
- recording
- signal
- audio signal
- video signal
- reproducing
- 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.)
- Granted
Links
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ス、第４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５図は複合映像へツドと複合音声ヘツドの
一例を示す構成図、第６図は磁気ヘツドのモデル
を示す説明図、第７図、第８図、第９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、第１０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１１図は磁
気ヘツドの諸元と配置の一例を示す説明図、第１
２図と第１３図はＰＣＭ記録状態検出ヘツドの動
作を説明するための説明図、第１４図は従来の記
録・再生回路を示す回路図、第１５図は従来の記
録電流制御系の動作を説明するための回路図であ
る。
図中、２……映像信号記録増幅器、１８……Ｐ
ＣＭ音声信号記録増幅器、１９……ＰＣＭヘツド
、２４……複合映像ヘツド、４０……ＰＭヘツド
、４１……ＰＣＭ音声信号再生増幅器、４２……
ＢＰＦ−Ｍ、４３……検出回路、４４……映像信
号記録電流制御回路、４５……利得可変回路、５
０……ＰＣＭ音声信号再生増幅器、５１……コン
デンサ、５２，５３……抵抗、５４……検出回路
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 the invention, FIG. 2 is a block diagram of a conventional magnetic tape recording and reproducing apparatus, and FIG.
The figure shows the spectrum of the video signal, FM audio signal, and PCM audio signal. Figure 4 is an explanatory diagram to explain an example of the recording trace (recording layer) by three-layer recording. Figure 5 is the link to the composite video. FIG. 6 is an explanatory diagram showing a model of a magnetic head, and FIGS. 7, 8, and 9 show the relationship between the second layer's RF video signal recording current and the third layer's RF video signal recording current. thickness,
A diagram showing an example of the influence on the reproduction spectrum of a QDPSK signal and the block error rate of a PCM audio signal. Figure 10 is a block diagram of a recording current control system of a conventional magnetic tape recording/reproducing device. Figure 11 shows various aspects of a magnetic head. Explanatory diagram showing an example of origin and arrangement, 1st
2 and 13 are explanatory diagrams for explaining the operation of the PCM recording state detection head, FIG. 14 is a circuit diagram showing a conventional recording/reproducing circuit, and FIG. 15 is a circuit diagram showing the operation of a conventional recording current control system. FIG. 2 is a circuit diagram for explanation. In the figure, 2...video signal recording amplifier, 18...P
CM audio signal recording amplifier, 19... PCM head, 24... Composite video head, 40... PM head, 41... PCM audio signal reproducing amplifier, 42...
BPF-M, 43...detection circuit, 44...video signal recording current control circuit, 45...variable gain circuit, 5
0... PCM audio signal regeneration amplifier, 51... Capacitor, 52, 53... Resistor, 54... Detection 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、上記位相変調
された音声信号の記録レベルを検出するための検
出用ヘツドと、上記検出用ヘツドで得られる信号
を増幅するために回転トランスの回転側に搭載さ
れ記録時のみ動作する信号増幅手段と、上記信号
増幅手段の出力から上記位相変調された音声信号
のレベルを検出する記録レベル検出手段と、上記
映像信号の記録電流を検出する記録電流検出手段
と、上記記録レベル検出手段による検出結果と記
録電流検出手段による検出結果とに基づいて上記
映像信号の記録電流を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 a video signal, which is a combination of a frequency-modulated luminance signal and a low frequency-converted color signal, on a magnetic tape, 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 a recording/reproducing device, a detection head is provided to detect the recording level of the phase-modulated audio signal, and a detection head is mounted on the rotating side of a rotary transformer to amplify the signal obtained by the detection head, and operates only during recording. recording level detection means for detecting the level of the phase modulated audio signal from the output of the signal amplification means, recording current detection means for detecting the recording current of the video signal, and recording level detection means for detecting the recording current of the video signal; 1. A magnetic tape recording/reproducing apparatus comprising video signal recording current control means for controlling the recording current of the video signal based on the detection result by the recording current detection means and the detection result by the recording current detection means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11331289U JPH0728562Y2 (en) | 1989-09-27 | 1989-09-27 | Magnetic tape recording / playback device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11331289U JPH0728562Y2 (en) | 1989-09-27 | 1989-09-27 | Magnetic tape recording / playback device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0352803U true JPH0352803U (en) | 1991-05-22 |
| JPH0728562Y2 JPH0728562Y2 (en) | 1995-06-28 |
Family
ID=31661729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11331289U Expired - Lifetime JPH0728562Y2 (en) | 1989-09-27 | 1989-09-27 | Magnetic tape recording / playback device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0728562Y2 (en) |
-
1989
- 1989-09-27 JP JP11331289U patent/JPH0728562Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0728562Y2 (en) | 1995-06-28 |
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