JPH04114364A - Sound complementing device - Google Patents

Abstract

PURPOSE:To output an audio FM signal without a break by complementing a drop-out part of the audio FM signal with the demodulated audio signal obtained from the output of a delay circuit. CONSTITUTION:When a tape is reproduced at a low/high speed by a reproducing head, a drop-out part B occurs in a reproduced pattern P of the tape as shown by (a) because the tape is reproduced across tracks of the audio recording pattern R, and the output from a demodulating circuit is dropped out at intervals of a certain period as shown by (b). In this case, an output (c) of a delay circuit has a waveform obtained by delaying the output of the demodulating circuit by a certain time, and a switch circuit is turned on only in the period of an output (e) of a detecting circuit which discriminates the presence or the absence of the demodulated signal, and thereby, an audio signal waveform (d) free from drop-out is obtained in a demodulated audio signal output part.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、低高速再生機能を有するビデオテープレコー
ダ（以下、ＶＴＲという）などの磁気記録再生装置に搭
載されて、低高速再生時に生じる音声ＦＭ信号の欠落部
分を補完する音声補完装置に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention is installed in a magnetic recording and reproducing device such as a video tape recorder (hereinafter referred to as VTR) having a low-speed playback function, and is used to record sound generated during low-speed playback. The present invention relates to a voice complementation device that complements missing parts of an FM signal.

〔従来の技術〕[Conventional technology]

近年、ＶＴＲにおいてはａ声ＦＭ回路を備えたものが要
請され、言及するに至っている。In recent years, VTRs equipped with an a-voice FM circuit have been requested and mentioned.

従来、このようなＶＴＲでは低高速再生時において、音
声ＦＭ信号はノイズなどが発生するため、ミューティン
グされるか、あるいは音声の踏切れない固定ヘッドによ
って再生されたノーマル音声信号に切換えられていた。Conventionally, in such VTRs, the audio FM signal generated noise during low-speed playback, so it was muted or switched to a normal audio signal played by a fixed head that could not reproduce the audio. .

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

しかしながら、上記のような従来装置の場合、低高速再
生時において、ミューティングすると映像のみの再生し
かできず、音声を聞くことができない。また、ノーマル
音声信号では音質低下や音声信号成分の全てを再生でき
ないといった不都合が生じ、また例え、低高速再生時に
おいて音声ＦＭ信号を聞けるようにしても、音声記録パ
ターンのトラックを横切る形で再生することになるため
、同信号を欠落部分なしに聞くことが不可能であるとい
う問題点を有していた。However, in the case of the conventional device as described above, when muting is performed during low-speed playback, only the video can be played back, and the audio cannot be heard. In addition, normal audio signals have problems such as poor sound quality and inability to reproduce all of the audio signal components, and even if it is possible to listen to the audio FM signal during low-speed playback, it is played back across the tracks of the audio recording pattern. Therefore, there was a problem in that it was impossible to listen to the same signal without missing parts.

本発明はかかる点に鑑み、低高速再生時に生じる音声Ｆ
Ｍ信号の欠落部分に欠落直前の信号を補完し、低高速再
生時にも音ＦＩＦ　ＭＬ号を踏切れなく出力できるよう
にした音声補完装置を提供することを目的とするもので
ある。In view of this point, the present invention provides an audio F generated during low-speed playback.
It is an object of the present invention to provide a voice complementing device capable of complementing a missing part of an M signal with a signal immediately before the missing part and outputting a sound FIF ML signal without interruption even during low-speed reproduction.

〔課題を解決するための手段〕[Means to solve the problem]

上記目的を達成するために本発明の＆声補完装置は、音
声ＦＭ信号復調回路と、音声ＦＭ信号の有無を検出する
検出回路と、前記復調回路から得られた復調音声信号を
一定期間遅延して出力する？ｉ延開回路、この遅延回路
の出力信号を前記検出回路からの音声ＦＭ信号無しの信
号により復調音声信号に戻すスイッチ回路と、遅延回路
の出力信号を同遅延回路の入力側に戻す帰還回路とによ
り構成したことに特徴を有するものである。In order to achieve the above object, the voice interpolation device of the present invention includes an audio FM signal demodulation circuit, a detection circuit that detects the presence or absence of an audio FM signal, and a demodulated audio signal obtained from the demodulation circuit that is delayed for a certain period of time. output? an i extension circuit, a switch circuit that returns the output signal of the delay circuit to a demodulated audio signal using a signal without the audio FM signal from the detection circuit, and a feedback circuit that returns the output signal of the delay circuit to the input side of the delay circuit. This system is characterized by the following structure.

〔作　　　用〕[For production]

本発明は−１−記した構成により、低高速ｉＩＴ生時に
復調回路で復調された音声ＦＭ信号中に生じるノイズ成
分の部分の信号、すなわち音声ＦＭ信号の欠落部を、８
雌回路出力より得られる復調音声信号によって補完する
ことにより、音声ＦＭ信号を踏切れることなく出力する
ことができる。According to the configuration described in -1-, the present invention eliminates the signal of the noise component portion generated in the audio FM signal demodulated by the demodulation circuit during low-speed iIT generation, that is, the missing part of the audio FM signal.
By supplementing with the demodulated audio signal obtained from the female circuit output, the audio FM signal can be output without being interrupted.

〔実　施　例〕〔Example〕

以上、本発明の一実施例について図面を参照しながら詳
細に説明する。第１図はこの実施例における音声補完装
置の構成を示すプロ、り図、第２図は同装置における信
号処理のパターン図である。Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic diagram showing the configuration of the speech complementation device in this embodiment, and FIG. 2 is a pattern diagram of signal processing in the same device.

第１図において、（１）は音声ＦＭ信号が記録されたＶ
ＴＲ用テープ、（２）はテープ（りの音声ＦＭ信号を再
生する再生ヘッド、（３）は再生ヘッド（２）で再生さ
れた音声ＦＭ信号を復調する回路、（４）は復調回路（
３）からの信号の有無を判別する検出回路、（５）は復
調回路（３）から得られた復調音声信号を一定期間遅延
させる回路、（６）は遅延回路（５）の出力信号を同遅
延回路（５）の入力側に戻す帰還回路、（７）は遅延回
路（５）の出力信号を検出回路（４）の信号無しの信号
により復調音−１信号に戻すスイッチ回路、（８）は復
調８声信号出力部である。In Figure 1, (1) is the V on which the audio FM signal is recorded.
TR tape, (2) is a playback head that plays back the audio FM signal from the tape, (3) is a circuit that demodulates the audio FM signal that is played back by the playback head (2), and (4) is a demodulation circuit (
(3) is a detection circuit that determines the presence or absence of a signal from the demodulation circuit (3), (5) is a circuit that delays the demodulated audio signal obtained from the demodulation circuit (3) for a certain period of time, and (6) is a circuit that delays the output signal of the delay circuit (5). (7) is a feedback circuit that returns the output signal of the delay circuit (5) to the input side of the delay circuit (5); (7) is a switch circuit that returns the output signal of the delay circuit (5) to the demodulated sound -1 signal using the signal without signal of the detection circuit (4); (8) is a demodulated 8-voice signal output section.

以上のように構成された音声補完装置の動作を説明する
と、再生ヘッド（２）により低高速でテープ（１）を再
生する場合、音声記録パターン（Ｒ）のトラックを横断
する形で再生するため、テープ（Ｎ）の再生パターン（
Ｐ）中には第２図（ａ）に示すように欠落部（Ｂ）が生
じ、このため復調回路（３）からの出力は第２図（ｂ）
のように一定周期毎に欠落した出力となる。この場合、
遅延回路（５）の出力は第２図（ｃ）のように復調回路
（３）からの出力から−・定期間遅延させた波形となり
、復調信号の有無を判別する検出回路（４）の出力（第
２図（ｅ））の期間のみスイッチ回路（７）がＯＮＬ、
これによって復調音声信号出力部（８）では第２図（ｄ
）のように欠落のない音声信号波形が得られる。To explain the operation of the audio complementation device configured as above, when the playback head (2) plays back the tape (1) at low speed, the audio recording pattern (R) is played back across the tracks. , playback pattern of tape (N) (
As shown in Fig. 2(a), there is a missing part (B) in P), so the output from the demodulation circuit (3) is as shown in Fig. 2(b).
The output will be missing at regular intervals like this. in this case,
The output of the delay circuit (5) is a waveform delayed by a period of time from the output from the demodulation circuit (3) as shown in Figure 2 (c), and is the output of the detection circuit (4) that determines the presence or absence of a demodulated signal. Only during the period (Fig. 2(e)), the switch circuit (7) is ON.
As a result, the demodulated audio signal output section (8)
), a sound signal waveform with no dropouts can be obtained.

また、上記動作よりも欠落時間が長くなった場合、欠落
直前の音声ＦＭ信号を遅延させても欠落部分の補完を行
うことが不可能なため、遅延回路（５）の出力信号を帰
還回路（６）に入力し、再度遅延回路（５）に同仏号を
戻して遅延を行うことにより、欠落直前の信号を復調音
声信号出力部（８）に出力することにより、欠落のない
音声信号波形が得られる。In addition, if the missing time becomes longer than the above operation, it is impossible to compensate for the missing part even if the audio FM signal immediately before the missing part is delayed, so the output signal of the delay circuit (5) is transferred to the feedback circuit (5). 6), the same French symbol is returned to the delay circuit (5) again and delayed, and the signal immediately before the loss is output to the demodulated audio signal output section (8), thereby creating an audio signal waveform without any loss. is obtained.

以上のようにこの実施例によれば、低高速でテープ（＋
）をＦＴ生した場合に起こるバ声ＦＭ信すの欠落を、欠
落直前の信号によって補完し　Ｎ、　ｉニア　ＦＭ信号
を踏切れることなく出力することができる。As described above, according to this embodiment, tape (+
) can be compensated for by the signal immediately before the loss of the FM signal that occurs when the FM signal is generated by FT, and output without cutting off the FM signal.

また、欠落時間の長短に関係なく欠落部に直前の４０号
を補完することができる。Further, it is possible to fill in the missing part with the immediately preceding No. 40 regardless of the length of the missing time.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明の？Ｎ声補完装置によれば、
音声ＦＭ信す復調回路と、音声ＦＭ信号の有無を検出す
る検出回路と、前記復調回路がら得られた復調音声信号
を一定期間遅延して出力する遅延回路と、この遅延回路
の出力信号を前記検出回路から出力された音声ＦＭ信号
無しの信号により復調音声信号に戻すスイッチ回路と、
前記遅延回路の出力信号を同遅延回路の入力側に戻す帰
還回路とにより構成してなるものとしたので、低高速再
生の行えるＶＴＲ等の磁気記録再生装置により音声ＦＭ
記録部を低高速再生した場合に、ｎノ８１ＦＭ信号を踏
切れることなく出力できる。また、編集作業等にも使用
することができるなど、その実用的効果は大きい。As explained above, what about the present invention? According to the N voice complementation device,
a demodulation circuit for transmitting audio FM; a detection circuit for detecting the presence or absence of an audio FM signal; a delay circuit for delaying and outputting the demodulated audio signal obtained from the demodulation circuit for a certain period of time; a switch circuit that returns the signal without the audio FM signal output from the detection circuit to the demodulated audio signal;
Since the feedback circuit is configured to return the output signal of the delay circuit to the input side of the delay circuit, audio FM can be recorded by a magnetic recording/reproducing device such as a VTR capable of low-speed reproduction.
When the recording section is played back at low speed, the n-81 FM signal can be output without being interrupted. It also has great practical effects, such as being able to be used for editing work, etc.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明の実施例に係る磁気記録再生装置の構成
を示すブロック図、第２図は同装置における信号処理を
図式化して示す説明図である。 （３）・・・復調回路、（４）・・・検出回路、（５）
・・・遅延回路、（６）・・・帰還回路、（７）・・・
スイッチ回路。 特許出願人　　松下電器産業株式会社FIG. 1 is a block diagram showing the configuration of a magnetic recording/reproducing device according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram schematically showing signal processing in the device. (3)...Demodulation circuit, (4)...Detection circuit, (5)
...Delay circuit, (6)...Feedback circuit, (7)...
switch circuit. Patent applicant Matsushita Electric Industrial Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] 音声ＦＭ信号復調回路と、音声ＦＭ信号の有無を検出す
る検出回路と、前記復調回路から得られた復調音声信号
を一定期間遅延して出力する遅延回路と、この遅延回路
の出力信号を前記検出回路から出力された音声ＦＭ信号
無しの信号により復調音声信号に戻すスイッチ回路と、
前記遅延回路の出力信号を同遅延回路の入力側に戻す帰
還回路とにより構成してなる音声補完装置。an audio FM signal demodulation circuit, a detection circuit for detecting the presence or absence of an audio FM signal, a delay circuit for delaying and outputting the demodulated audio signal obtained from the demodulation circuit for a certain period of time, and detecting the output signal of the delay circuit. a switch circuit that returns the signal without the audio FM signal output from the circuit to the demodulated audio signal;
and a feedback circuit that returns the output signal of the delay circuit to the input side of the delay circuit.