JPH0352801U - - Google Patents
Info
- Publication number
- JPH0352801U JPH0352801U JP11330989U JP11330989U JPH0352801U JP H0352801 U JPH0352801 U JP H0352801U JP 11330989 U JP11330989 U JP 11330989U JP 11330989 U JP11330989 U JP 11330989U JP H0352801 U JPH0352801 U JP H0352801U
- Authority
- JP
- Japan
- Prior art keywords
- recording
- signal
- audio 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.)
- Granted
Links
- 230000005236 sound signal Effects 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 11
- 239000002131 composite material Substances 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
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
はこの考案の一実施例による磁気テープ記録再生
装置の再生時における動作を説明するための回路
図、第３図は従来の磁気テープ記録再生装置の構
成図、第４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１
０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１１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１２図は磁気ヘツドの諸元と配置の一例を示す
説明図、第１３図と第１４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１５
図は従来の記録・再生回路を示す回路図、第１６
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……電流回路、５５……回転
形接触子、５６……電源フイルタである。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/reproducing apparatus according to an embodiment of this invention, and FIG. 2 is for explaining the operation during reproduction of a magnetic tape recording/reproducing apparatus according to an embodiment of this invention. 3 is a configuration diagram of a conventional magnetic tape recording/reproducing device, and FIG. 4 is a circuit diagram of a video signal, FM audio signal, PCM
A graph showing the spectrum of an audio signal, FIG. 5 is an explanatory diagram for explaining an example of a recording trace (recording layer) by three-layer recording, FIG. 6 is a configuration diagram showing an example of a composite video head and a composite audio head, Figure 7 is an explanatory diagram showing a model of the magnetic head, Figures 8, 9, and 1.
Figure 0 shows an example of the influence of the thickness of the second layer on the RF video signal recording current of the third layer, the playback spectrum of the QDPSK signal, and the block error rate of the PCM audio signal. A configuration diagram of a recording current control system of a recording/reproducing device,
FIG. 12 is an explanatory diagram showing an example of the specifications and arrangement of the magnetic head, FIGS. 13 and 14 are explanatory diagrams for explaining the operation of the PCM recording state detection head, and FIG.
The figure is a circuit diagram showing a conventional recording/reproducing circuit, No. 16.
The figure is a circuit diagram for explaining the operation of a conventional recording current control system. 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... Current circuit, 55... Rotary contact, 56... Power filter. In addition,
In the drawings, 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
記録レベル検出手段による検出結果に基づいて上
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; and controlling the recording current of the video signal based on the detection result by the recording level detection means. What is claimed is: 1. A magnetic tape recording and reproducing apparatus comprising: a video signal recording current control means for controlling a video signal;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11330989U JPH0728561Y2 (en) | 1989-09-27 | 1989-09-27 | Magnetic tape recording / playback device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11330989U JPH0728561Y2 (en) | 1989-09-27 | 1989-09-27 | Magnetic tape recording / playback device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0352801U true JPH0352801U (en) | 1991-05-22 |
| JPH0728561Y2 JPH0728561Y2 (en) | 1995-06-28 |
Family
ID=31661726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11330989U Expired - Lifetime JPH0728561Y2 (en) | 1989-09-27 | 1989-09-27 | Magnetic tape recording / playback device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0728561Y2 (en) |
-
1989
- 1989-09-27 JP JP11330989U patent/JPH0728561Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0728561Y2 (en) | 1995-06-28 |
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