JPS5990483A - Sound recording system - Google Patents

Abstract

PURPOSE:To simplify the constitution of a reproducer and to obtain a magnetic recorder and reproducer with low cost and high quality by frequency-dividing an SIF signal received from a television broadcast in the intercarrier system by a suitable ratio to obtain a sound FM signal at recording. CONSTITUTION:The signal is received from an antenna 7 at recording, the SIF signal is extracted by a BPF17, and the sound FM signal 3 having the center frequency f3 is obtained by frequency-dividing the signal in a prescribed ratio at a frequency divider 40, the level is adjusted by an amplifier 41 and the result is inputted to a recording amplifier 13. The sound FM signal extracted by a BPF42 at reproduction is multiplied by the same ratio as the frequency dividing ratio at the recording by using a multiplier 43 and the sound reproducing FM signal equivalent to the SIF signal at the receiving and recording is obtained. As to the moitor of sound, the received SIF signal itself at the recording and the sound reproducing FM signal reproduced at the reproduction to be equivalent at the receiving and recording are applied respectively to an amplitude modulator 31 via a switch 37 to obtain the sound carrier of an optional TV channel.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、磁気記録再生装置によるテレビジョン放送の
記録再生における音声記録方式に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an audio recording method for recording and reproducing television broadcasting using a magnetic recording and reproducing device.

従来例の構成とその問題点 回転２ヘツドヘリ力ルスキヤンニング方式磁気記録再生
装誼１こおいて、輝度ＦＭ信号と低域変換色信号とのス
ペクトルの間に、音声ＦＭ信号を配して同一ビデオトラ
ック上に記録する方式はすでに知られている。その周波
数スペクトルは第１図に示す通りであり、（１）はｆｌ
を中心周波とする輝度ＦＭ信号、（２）は中心周波数ｆ
２に変換された色信号、（３〕は中心周波数ｆ３である
音声ＦＭ信号である。Conventional configuration and its problems Rotating two-head helical force scanning magnetic recording and reproducing system 1 In this case, an audio FM signal is placed between the spectra of the luminance FM signal and the low-frequency conversion color signal. Methods of recording on video tracks are already known. The frequency spectrum is as shown in Figure 1, and (1) is fl
Luminance FM signal with center frequency f, (2) is center frequency f
The color signal converted into 2 and (3) is an audio FM signal whose center frequency is f3.

第２図は磁気記録再生装置からテレビジョンモニターに
送出される変調信号を示し、（４）は映仰搬送波ｆｖで
振幅変調された映像搬送波スペクトル、（５）は色搬送
波スペクトル、（６）は音声ＦＭ搬送波スペクトルであ
る。但し、図中の下側波帯は、別途設けた残留側波帯フ
ィルターを通した特性として現わしである。Figure 2 shows the modulated signal sent from the magnetic recording/reproducing device to the television monitor, where (4) is the video carrier spectrum amplitude-modulated with the video carrier wave fv, (5) is the color carrier spectrum, and (6) is the This is an audio FM carrier spectrum. However, the lower sideband in the figure appears as a characteristic passed through a separately provided residual sideband filter.

テレビジョン放送の記録再生を行なうために用いられる
従来の磁気記録再生装置１こついて第３図により説明す
る。記録時は、アンテナ（７）から受信し、チューナ（
３）、ＶＩＰ回路（９）で同調増幅する。映像信号は、
検波・増幅回路ＱＯを経て、Ｉ、ＰＦ　（Ｉυ、ＦＭ変
調器・ｆ（ＰＦ□を通って記録アンプ（至）に入力され
、回転ヘッドα４（ハ）によりテープ上に記録される。A conventional magnetic recording and reproducing apparatus 1 used for recording and reproducing television broadcasting will be explained with reference to FIG. When recording, it is received from the antenna (7) and the tuner (
3) Tuned amplification is performed by the VIP circuit (9). The video signal is
After passing through the detection/amplification circuit QO, the signals are inputted to the recording amplifier (to) through I, PF (Iυ, FM modulator/f (PF□), and recorded on the tape by the rotary head α4 (c).

カラー信号は、記録カラー処理回路ＯＱにより、低域変
換色信号（２）を得て記録アンプ（至）に人力される。From the color signal, a low-frequency conversion color signal (2) is obtained by the recording color processing circuit OQ, and is inputted to the recording amplifier (to).

一方、音声は、ＶＩＰ回路（９）の出力からＢＰＦαη
によりＳＩＦ信号を取出し、ＳＩＦ検波回路（至）によ
り検波及びデエンファシスされ、音声出力を得る。次に
プリエンファシス回路（１’Ｊ、ＦＭ変調回路（ホ）、
増幅器個）により中心周波数ｆ３なる音声ＦＭ信号（３
）を得て、前記記録アンプ（至）に入力される。On the other hand, the audio is transmitted from the output of the VIP circuit (9) to BPFαη
The SIF signal is extracted by the SIF detection circuit (to) and is detected and de-emphasized to obtain an audio output. Next, the pre-emphasis circuit (1'J), the FM modulation circuit (E),
Amplifiers) generate an audio FM signal (3
) is input to the recording amplifier (to).

次に再生時は、ベッドアンプ翰の出力としておおよそ第
１図に示す様なスペクトラムを得るので、これを分岐し
、ＨＰＦｃ／：ｌ、　　ＦＭ復調器・ＬＰＦ　Ｍ　Ｉｎ
より再生輝度信号を得ると共に、再生カラー信号処理回
路（ホ）により再生カラー副搬送波を得、各々混合器（
ト）に加えて映像出力を得る。一方、ＢＰＦ＠により取
出されｔコ音声再生ＦＭ信号から、ＦＭ復調器（ハ）、
ディエンファシス回路（ホ）により音声再生出力を得る
。音声再生出力は、ＦＭ変調器働によりプリエンファシ
ス及びＦＭ変調されて、前記映像出力と共に振幅変調器
ｃ１１）に加えられ、映像搬送波発振鼎（２）からのキ
ャリアにより変調されて出力端子（至）に送出される。Next, during playback, a spectrum roughly shown in Figure 1 is obtained as the output of the bed amplifier, so this is branched and sent to HPFc/:l, FM demodulator/LPF M In
A reproduced luminance signal is obtained from the reproduced luminance signal, and a reproduced color subcarrier is obtained by the reproduced color signal processing circuit (e), and each mixer (
) and video output. On the other hand, from the t audio reproduction FM signal extracted by BPF@, an FM demodulator (c),
Audio reproduction output is obtained by the de-emphasis circuit (e). The audio playback output is pre-emphasized and FM modulated by the FM modulator, and is applied together with the video output to the amplitude modulator c11), where it is modulated by the carrier from the video carrier wave oscillator (2) and sent to the output terminal (to). will be sent to.

なお、ＳｌＦｍ波回路（至）のディエンファシス特性と
、ＦＭ変調器曽のプリエンファシス特性とは、テレビジ
ョン放送方式に定められる特性を有し、プリエンファシ
ス回路０９及びディンファシス回路四の特性は、この装
置に特有に定められた特性である。スイッチ（ロ）（７
）は記録時にオン、スイッチ（至）は再生時にオンとな
り、スイッチ■（至）は記録・再生時のモニター切換用
で、いずれのスイッチ＠（至）も第３図においては記録
状態Ｉこある。■はヘッドアンプのチャンネル切換用信
号である。また、例えばＮＴＳＣ方式においては、第２
内に示すｆｓｃ≠８．５８Ｍ［（ｚ、　ｆａ　＝　４．
５ＭＨｚである。さらに、受信した音声ＳＩＦ信号の周
波数は４．５ＭＨｚである。Note that the de-emphasis characteristics of the SlFm wave circuit (to) and the pre-emphasis characteristics of the FM modulator have characteristics defined in the television broadcasting system, and the characteristics of the pre-emphasis circuit 09 and the de-emphasis circuit 4 are as follows. This is a characteristic unique to this device. Switch (b) (7
) is on during recording, the switch (to) is on during playback, the switch (to) is for switching the monitor during recording and playback, and both switches @ (to) are in the recording state I in Figure 3. . ■ is a head amplifier channel switching signal. For example, in the NTSC system, the second
fsc≠8.58M [(z, fa = 4.
It is 5MHz. Furthermore, the frequency of the received audio SIF signal is 4.5 MHz.

しかしながらこのような従来方式では、磁気記録再生装
置の構成が複雑で、高価なものになるという問題があっ
た。However, such a conventional method has a problem in that the structure of the magnetic recording/reproducing apparatus is complicated and expensive.

発明の目的 本発明は上記従来の欠点を解消するもので、テレビジョ
ン放送方式の音声ＳＩＦ信号を積極的に利用し、磁気記
録再生装置の構成を簡略化できる音声記録方式を提供す
ることを目的とする。Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks, and aims to provide an audio recording method that actively utilizes the audio SIF signal of the television broadcasting method and can simplify the configuration of a magnetic recording and reproducing device. shall be.

発明の構成 上記目的を達するため、本発明の音声記録方式は、回転
２ヘツドヘリ力ルスキヤンニング方式の磁気記録再生装
置を用い、輝度信号をＦＭ変調し、カラーサブキャリア
を低域周波数変換し、かつ音声ＦＭ周波数を前記２周波
スペクトラムの間に配して同一ビデオトラック上（こ記
録する音声記録方式であって、記録時に、音声ＦＭ信号
を、テレビジョン放送をインターキャリア方式にて受信
したＳＩＦ信号を適当比率で分周して得、再生時に、再
生スペクトラム信号から音声ＦＭ信号を選択した後、前
記比率にでてい倍し、受信時のＳＩＦ信号と等価な音声
再生ＦＭ信号を得る構成である。Structure of the Invention In order to achieve the above object, the audio recording method of the present invention uses a rotating two-head helical force scanning type magnetic recording and reproducing device, performs FM modulation on the luminance signal, converts the color subcarrier into low frequency, and the audio FM frequency is arranged between the two frequency spectra and recorded on the same video track. The signal is obtained by dividing the frequency of the signal at an appropriate ratio, and at the time of reproduction, after selecting an audio FM signal from the reproduced spectrum signal, the ratio is multiplied by the above ratio to obtain an audio reproduction FM signal equivalent to the SIF signal at the time of reception. be.

実施例の説明 以下、本発明の一実施例について、図面に基づいて説明
する。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

第４図は本発明の一実施例における磁気記録再生装置の
回路ブロック図であり、第８図に示す構成要素と同一の
構成要素には同一の符号を付してその説明を省略する。FIG. 4 is a circuit block diagram of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, and the same components as those shown in FIG. 8 are given the same reference numerals and their explanations will be omitted.

なお本実施例によって得られる記録信号スペクトル及び
テレビジョンモニターに送出される信号は、各々第１図
及び第２図瞥こ示す通りであり、従来例と全く同等であ
る。また映像信号（輝度信号及びカラー信号）の記録再
生動作及び振幅変調器０υの動作は第８図に示す従来例
と全く同様なので省略する。Note that the recording signal spectrum obtained by this embodiment and the signal sent to the television monitor are as shown in FIGS. 1 and 2, respectively, and are completely equivalent to the conventional example. Further, the recording/reproducing operation of the video signal (luminance signal and color signal) and the operation of the amplitude modulator 0υ are completely the same as in the conventional example shown in FIG. 8, and therefore will not be described here.

第４図において、に）は分局器、Ｕは増幅器、θ匂はＢ
ＰＦ、Ｕはてい倍器である。記録時は、アンテナ（７）
カら受信し、チューナ（８）、ＶＩＦ　回路（９）で同
調増幅する。ＢＰＦ　（ＩりによりＳＩＦ信号を取出し
、分局器に）にて一定の比率で分周して中心周波数ｆ３
なる音声ＦＭ信号（３）を得、増幅器θ◇Ｉこよりレベ
ル調整して記録アンプ（至）に入力する。In Fig. 4, ni) is a branching unit, U is an amplifier, and θ is B.
PF and U are multipliers. When recording, antenna (7)
The tuner (8) and VIF circuit (9) tune and amplify the signal. BPF (takes out the SIF signal by I and sends it to the divider) divides the frequency at a constant ratio to obtain the center frequency f3
An audio FM signal (3) is obtained, the level is adjusted by the amplifier θ◇I, and the signal is input to the recording amplifier (to).

再生時は、ＢＰＦＱ９により取出された音声ＦＭ信号を
、てい倍器（財）により記録時の分局比率と同じ比率で
Ｃい倍して、受信記録時のＳＩＦ信号と等価な音声再生
ＦＭ信号を得る。At the time of playback, the audio FM signal extracted by BPFQ9 is multiplied by C by a multiplier at the same ratio as the division ratio at the time of recording, to produce an audio playback FM signal equivalent to the SIF signal at the time of reception and recording. obtain.

次ｔｒ　Ｈ声（７）モニタ１こついＣは、記録時は受信
したＳＩＦ信号そのもの、再生時は受信記録時と等価と
なるよう再生変換された音声再生ＦＭ信号を、スイッチ
助を介して振幅変調器０］）に加えて、任意のテレビジ
ョンチャンネルの音声搬送波を得ている。なお増幅器θ
η及びＢＰＦ（６）は、第８図に示す増幅器（財）及び
ＢＰＦ　＠とほぼ同様の働きであるが、信号の周波数の
み異なる。Next tr H Voice (7) Monitor 1 When recording, the received SIF signal itself, and during playback, the audio playback FM signal that has been reproduced and converted to be equivalent to the received and recorded signal is sent to the amplitude via a switch. In addition to the modulator 0]), the audio carrier of any television channel is obtained. Note that the amplifier θ
η and BPF (6) have almost the same functions as the amplifier and BPF shown in FIG. 8, but only the signal frequency is different.

このように本実施例によれば、第３図１こ示すＳＩＦ検
波回路０■、プリエンファシス回路０１．　　ＦＭ変調
回路（４）、ＦＭ復調器（ホ）、ディエンファシス回路
翰、ＦＭ変調器ζ１を省く串ができる。また分周器−及
びてい倍器−はきわめて簡単なディジタル回路により構
成できる。さらにこれらのことからテレビジョン放送に
より硫体されている高品位のＦＭ音声の特質を生かした
、ハイファイ録音・再生が可０しとなる。As described above, according to this embodiment, the SIF detection circuit 0■, the pre-emphasis circuit 01. It is possible to omit the FM modulation circuit (4), the FM demodulator (e), the de-emphasis circuit and the FM modulator ζ1. Furthermore, the frequency divider and multiplier can be constructed using extremely simple digital circuits. Furthermore, these facts make it possible to perform high-fidelity recording and playback that takes advantage of the characteristics of the high-quality FM audio broadcast by television broadcasts.

発明の詳細 な説明したように本発明によれば、磁気記録再生装置の
構成の簡略化を実現でき、安価かつ高品位な磁気記録再
生装置を得ることができる。DETAILED DESCRIPTION OF THE INVENTION As described in detail, according to the present invention, it is possible to simplify the configuration of a magnetic recording and reproducing device, and to obtain an inexpensive and high-quality magnetic recording and reproducing device.

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

第１図は記録信号スペクトラムの説明図、第２図はモニ
ター用テレビジョン信号スペクトラムの説明図、第３図
は従来方式を用いた磁気記録再生装置の回路ブロック図
、第４図は本発明の一実施例における音声記録方式を採
用した磁気記録再生装置の回路ブロック図である。 働・・・分周器、θη・・・増幅器、■・・・ＢＰＦ　
、（財）・・・てい倍器。 代理人　　　森　本　義　弘 第１図 周Ｈ１ｌＬ 第２図 ７１ｉ１波叡Fig. 1 is an explanatory diagram of a recording signal spectrum, Fig. 2 is an explanatory diagram of a monitor television signal spectrum, Fig. 3 is a circuit block diagram of a magnetic recording/reproducing apparatus using a conventional method, and Fig. 4 is an explanatory diagram of a magnetic recording/reproducing apparatus using the conventional method. FIG. 1 is a circuit block diagram of a magnetic recording and reproducing device that employs an audio recording method in one embodiment. Function...Frequency divider, θη...Amplifier, ■...BPF
, (goods) ... multiplier. Agent Yoshihiro Morimoto Figure 1 Shu H1lL Figure 2 71i1 Haei

Claims (1)

【特許請求の範囲】 １、　　回転２ヘツドヘリ力ルスキヤンニング方式の磁
気記録再生装置を用い、輝度信号をＦＭ変調し、カラー
サブキャリアを低域周波数変換し、かつ音声ＦＭ周波数
を前記２周波スペクトラムの間に配して同一ビデオトラ
ック上に記録する音声記録方式であつＣ，［ｉｉ：！Ｗ
ｊ時に、音声ＦＭ信号を、テレビジョン放送をインター
キャリア方式にて受信したＳＩＦ信号を適当比率で分局
して得、丙午時に、再生スペクトラム信号から音声ＦＭ
信号を選択した後、前記比率にててい倍し、受信時のＳ
ＩＦ信号と等価な音声再生ＦＭ信号を得る音声記録方式
。 ２、　記詠時には受信復調して得られた複合映蝕他号と
ＳＩＦ信号とを、また再生時には再生複合映骸信号と音
声再生ＦＭ信号とを、任意のテレビジョンチャンネルに
相当するｗ送波ｔこより振幅変調して所望のテレビジョ
ン信号を得る特許請求の範囲第１須記載の音声記録方式
。[Claims] 1. Using a rotating two-head helical force scanning magnetic recording and reproducing device, the luminance signal is FM modulated, the color subcarrier is converted to a low frequency, and the audio FM frequency is converted into the two-frequency spectrum. C, [ii:! W
At J o'clock, an audio FM signal is obtained by dividing the SIF signal received by intercarrier television broadcasting at an appropriate ratio, and at O o'clock, an audio FM signal is obtained from the reproduced spectrum signal.
After selecting the signal, multiply it by the above ratio and get the S at the time of reception.
An audio recording method that obtains an audio reproduction FM signal equivalent to an IF signal. 2. At the time of recording, the composite video signal and SIF signal obtained by reception and demodulation are transmitted, and at the time of playback, the reproduced composite video signal and the audio reproduction FM signal are transmitted to the w wave corresponding to any television channel. An audio recording system according to claim 1, in which a desired television signal is obtained by amplitude modulating the signal.