JPS6020064U - Carrier detection circuit for frequency modulated audio signals - Google Patents
Carrier detection circuit for frequency modulated audio signalsInfo
- Publication number
- JPS6020064U JPS6020064U JP11095483U JP11095483U JPS6020064U JP S6020064 U JPS6020064 U JP S6020064U JP 11095483 U JP11095483 U JP 11095483U JP 11095483 U JP11095483 U JP 11095483U JP S6020064 U JPS6020064 U JP S6020064U
- Authority
- JP
- Japan
- Prior art keywords
- detection circuit
- modulated audio
- frequency
- audio signal
- carrier detection
- 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
Landscapes
- Television Signal Processing For Recording (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来のＡＦキャリア検出回路の一例を示した構
成図、第２図はＡＦ記録テープのエンベロープのスペク
トル図、第３図はＡＦ記録の行なわれていないテープの
エンベａ−プのスペクトル図、第４図は本考案のＡＦキ
ャリア検出回路の一実施例を示した構成図、第４図は第
３図のゲート回路５の動作状態を示した図である。
１・・・・・・バンドパスフィルタ、３・・・・・・検
波回路、４・・・・・・コンパレータ、５・・・・・・
ゲート回路。
−補正 昭５８．１２．１３
図面の簡単な説明を次のように補正する。
明細書第８頁第８〜９行の［第４図は第３図のゲート回
路５の動作状態を示した図である。」を「第５図は第３
図のゲート回路５の動作状態を示した図である。」と補
正する。Fig. 1 is a block diagram showing an example of a conventional AF carrier detection circuit, Fig. 2 is a spectrum diagram of an envelope of an AF recording tape, and Fig. 3 is a spectrum of an envelope of a tape without AF recording. 4 is a block diagram showing an embodiment of the AF carrier detection circuit of the present invention, and FIG. 4 is a diagram showing the operating state of the gate circuit 5 of FIG. 3. 1... Bandpass filter, 3... Detection circuit, 4... Comparator, 5...
gate circuit. -Amendment December 13, 1982 The brief description of the drawing is amended as follows. [FIG. 4 is a diagram showing the operating state of the gate circuit 5 of FIG. 3 on page 8, lines 8 to 9 of the specification. ” to “Figure 5 is the third
FIG. 3 is a diagram showing the operating state of the gate circuit 5 shown in the figure. ” he corrected.
Claims (1)
声信号の帯域信号のみを通過させるバンドパスフィルタ
と、このバンドパスフィルタの出力信号を検波する検波
回路と、検波出力電圧と設定電圧とを比較して周波数変
調された音声信号のキャリアの有無を出力するコンパレ
ータとから成る周波数変調音声信号のキャリア検出回路
におい− で、検波回路の前段にゲート回路を挿
介し、このゲート回路を水平同期信号に同期して開閉さ
せることにより周波数変調された音声信号の映像信号相
当部分を阻止して水平同期相当部分のみを次段の検波回
路に送出するようにしたことを特徴とする周波数変調音
声信号のキャリア検出回路。A bandpass filter that passes only the frequency-modulated audio signal from the envelope of the reproduced video signal, a detection circuit that detects the output signal of this bandpass filter, and a detection circuit that detects the frequency by comparing the detection output voltage and a set voltage. In a carrier detection circuit for a frequency modulated audio signal, which is composed of a comparator that outputs the presence or absence of a carrier in a modulated audio signal, a gate circuit is inserted before the detection circuit, and this gate circuit is synchronized with a horizontal synchronizing signal. A carrier detection circuit for a frequency-modulated audio signal, characterized in that the frequency-modulated audio signal is opened and closed to block a portion of the frequency-modulated audio signal that corresponds to a video signal and sends only a portion that corresponds to horizontal synchronization to a next-stage detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11095483U JPS6020064U (en) | 1983-07-19 | 1983-07-19 | Carrier detection circuit for frequency modulated audio signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11095483U JPS6020064U (en) | 1983-07-19 | 1983-07-19 | Carrier detection circuit for frequency modulated audio signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6020064U true JPS6020064U (en) | 1985-02-12 |
Family
ID=30257834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11095483U Pending JPS6020064U (en) | 1983-07-19 | 1983-07-19 | Carrier detection circuit for frequency modulated audio signals |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6020064U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0260901U (en) * | 1988-10-18 | 1990-05-07 |
-
1983
- 1983-07-19 JP JP11095483U patent/JPS6020064U/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0260901U (en) * | 1988-10-18 | 1990-05-07 |
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