JPS6161250A - Reproducing device of cue signal - Google Patents

Reproducing device of cue signal

Info

Publication number
JPS6161250A
JPS6161250A JP59183065A JP18306584A JPS6161250A JP S6161250 A JPS6161250 A JP S6161250A JP 59183065 A JP59183065 A JP 59183065A JP 18306584 A JP18306584 A JP 18306584A JP S6161250 A JPS6161250 A JP S6161250A
Authority
JP
Japan
Prior art keywords
signal
cue signal
frequency
cue
carrier
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
Application number
JP59183065A
Other languages
Japanese (ja)
Inventor
Yasuo Kondo
康雄 近藤
Yoshiji Kusunoki
楠 好次
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP59183065A priority Critical patent/JPS6161250A/en
Publication of JPS6161250A publication Critical patent/JPS6161250A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To reproduce a cue signal at a low speed and to prevent to output the carrier by installing a programmable filter where a signal reproducing and demodulating a cue signal is inputted and controlling frequency characteristics in proportion to a travelling speed of a magnetic tape. CONSTITUTION:A counter circuit 17 calculates a pulse of a high frequency clock generating device 16 contained in a pulse interval of a tachometer pulse generator 15, and an output becomes a numeric in proportion to an inverse number of a travelling speed of a tape 5. A frequency characteristic of a programmable filter 14 is controlled so as to be in proportion to the inverse number of an output. When a signal is reproduced in which a carrier is modulated by a cue signal from a reproducing head 4, an output of a amplifying shaping circuit 13 includes a cue signal, a carrier frequency signal, a side band wave frequency signal, etc. A cassette off frequency is controlled and the cue signal is extracted at an excellent S/N so that the tape 5 may become low in speed and may not pass the programmable filter 14 up to a carrier frequency.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明はキュー(cue )信号の再生に関するもの
である、 磁気テープ装置において、早送り、巻戻しなど、高速で
テープを送っているときに、それぞれのプログラムの先
頭でテープ金自動的に停止させる機能を鴫出しと称して
いるが、キュー信号はこの頭出し及び其他の目的に利用
される信号である。
[Detailed Description of the Invention] [Industrial Application Field] This invention relates to the reproduction of cue signals. The function of automatically stopping the tape at the beginning of each program is called a start, and the cue signal is used for this purpose and for other purposes.

〔従来の技術〕[Conventional technology]

キュー信号は磁気テープに記録てれ早送りの場合九再生
されて他の信号と容易に識別することができるように構
成されているが、キュー(g号そのものtそのベース周
波数りまま記録→生する)9合と、キュー信号しくよっ
て変調し′fcIfG送波テ記録する場合とが6 ・た
Cue signals are recorded on magnetic tape and played back in fast forward mode so that they can be easily distinguished from other signals. ) 9 cases, and 6 cases where the signal is modulated according to the cue signal and is transmitted and recorded by fcIfG.

第2図は従来の装置の一例金示すブロック図で。FIG. 2 is a block diagram showing an example of a conventional device.

IJI?+−1+イ111し1・←ジー−1’信号出力
端子、(3)は記録ヘッド、(・t)は111生ヘツド
、(5ンl−を磁気テープ、(6)、(8ンけそれぞれ
増幅器、(7) l−1バイアス発生器である。第2図
に示す回路は音声信号等をそのベース周波数の1ま磁気
録音し、かつ再生する回路であってこれをそのま1キユ
一傳号VC応用したものである。
IJI? +-1+I 111 and 1 ← G-1' signal output terminal, (3) is the recording head, (・t) is the 111 raw head, (5-inch l- is the magnetic tape, (6), (8-inch They are an amplifier and (7) an l-1 bias generator.The circuit shown in Figure 2 is a circuit that magnetically records an audio signal, etc. up to its base frequency, and plays it back. This is an application of Dengo VC.

第3図1−を従来の装置の他の例?示すブロック図で、
図ンコおいて第2図と同一符号は同−又は相当部分金示
し、(9)はPWM(パルス幅変調〕変虐回路、(11
)はP W M (Jl、1lJJ回路、(10,1,
(12)はそれぞれ増幅器でろる。
Figure 3 1- is another example of the conventional device? In the block diagram shown,
In the figure, the same symbols as in Figure 2 indicate the same or equivalent parts, (9) is a PWM (pulse width modulation) perversion circuit, (11
) is P W M (Jl, 1lJJ circuit, (10, 1,
(12) are each processed by an amplifier.

C拍明が解決しようとする問題点〕 第2図に示すようにキュー信号?ベース周波数の1ま録
音再生する装置では磁気テープ?低速で走行する場合に
キュー信号?再生するとS/N (信号対雑音比)が惑
くなるとか、ヘッドの形状によるコンタ−エフェクト(
contour effect )  が生ずるという
問題点があっ友。
Problems that C Beat Ming tries to solve] Cue signal as shown in Figure 2? Is magnetic tape a device that records and plays back the base frequency? Cue signal when driving at low speed? During playback, the S/N (signal-to-noise ratio) may be distorted, or the contour effect due to the shape of the head (
However, there is a problem that a contour effect occurs.

また、P CM (pulse code modnl
ation )信号金録晋再生する磁気テープ装置で第
2図に示す従来の装置全使用する場合、PCM信号に7
1応して多ビットの並列信号上同時に録音再生するP 
Chr録音再生用のヘッド金儲えているが、このPCM
録音再生用のヘッドのうちの1つのトラック用のヘッド
全キュー信号の録音再生用に使うか、又はキュー信号の
録音再生用として専用のヘッド金円いなければならぬが
、岬、用のヘッドを用いることは装置のコスト?高める
ことになり不経済であり、かつまた、専用のヘッドを設
けることは走行系の性能全低下する方向に作用するとい
う問題潰からり、P CM録音再生用のヘッドの一部を
使用する場合、そのヘッドはPCM信号のように高い周
波数成分の信号圧1afるように設討石れているので、
キュー信号のように低い周波数成分の信号の録音再生に
用いるKViヘッドの性能が不通であり、またキュー信
号記録再生トラックとPCM記録再生トラック間の相互
干渉が発生するという問題があった0 第3図に示すようK(o]等かの搬送波?使用するもの
に、キュー信号をそのベース周波数のまま記録し再生す
ることにともなう上述の問題点を解決することができる
が、低速走行状態でキュー信号を再生したとき、その搬
送波の周波数が低下して、この周波数がフィルタで阻止
されずに出力してしまうという問題点かあっto この発明は上記のような問題点全解決するため−になさ
れたもので、キ子−信号によって変調した搬送波を録音
再生する場合、低速走行において再生された裔送鼓が出
力されることのないように阻止できる再生装置を提供す
ることを目的としているっ 〔間寵点金解決するための手段〕 この発明でに、キュー信号を再生して復調した信号が入
力されるプログラマブルフィルタを設け。
In addition, P CM (pulse code modnl)
ation) When using all of the conventional devices shown in Figure 2 in a magnetic tape device for recording and reproducing signal signals, the PCM signal has 7
P that simultaneously records and plays on multi-bit parallel signals
The head for Chr recording and playback is making money, but this PCM
One of the recording and playback heads must be used for recording and playing back all cue signals, or a dedicated head must be used for recording and playing back cue signals. What is the cost of the equipment? If a part of the head for PCM recording and playback is used, it is uneconomical to increase the performance of the PCM recording and playback. , the head is designed so that the signal pressure of high frequency components such as PCM signals is 1af.
There was a problem that the performance of the KVi head used for recording and reproducing signals with low frequency components such as cue signals was poor, and mutual interference occurred between the cue signal recording and reproducing track and the PCM recording and reproducing track. As shown in the figure, it is possible to solve the above-mentioned problems associated with recording and reproducing the cue signal with its base frequency on a carrier wave such as K(o). When a signal is regenerated, the frequency of its carrier wave decreases and this frequency is output without being blocked by a filter.This invention was made to solve all of the above problems. The object of the present invention is to provide a playback device that can prevent the played back drum from being output when driving at low speed when recording and playing back a carrier wave modulated by a key signal. Means for Solving the Problem] In the present invention, a programmable filter is provided to which a signal obtained by reproducing and demodulating a cue signal is input.

そのプログラマブルフィルタの周波数特性全磁気テープ
の走行速度に比例して’Jll Hするようにした。
The frequency characteristic of the programmable filter was made to be 'JllH' in proportion to the running speed of the entire magnetic tape.

キュー信号によってf調した搬送波全録音しこれを再生
して復調しfc倍信号ベース周波数のキュー信号と、搬
送波の周波数信号及び側(fF波のイど号を含んでおり
、この信号忙フィルタに人力して周波数の高い搬送波は
これ全1泪止しベース周波数のキュー信号だけfjr:
l0J3力巳なければならぬが、再生される信号の周波
数はテープの走行速度に比例して変化するので、この変
化に対応してプログラマブルフィルターの周M、、?5
!特性を変化させるのである。
The entire carrier wave tuned to f by the cue signal is recorded, and this is played back and demodulated to produce the cue signal at the base frequency of the fc times signal, the frequency signal of the carrier wave, and the frequency signal of the carrier wave (which includes the fF wave's equal sign). All the high frequency carrier waves are manually generated, and only the base frequency cue signal is fjr:
10J3RikimiThe frequency of the reproduced signal changes in proportion to the tape running speed, so the circumference of the programmable filter M...? 5
! It changes the characteristics.

〔作用〕[Effect]

この発明ではテープの走行速度に比例し之周波数のパル
ス全発生するタコパルス発生器によってテープの走行速
度勿検出し、プログラマブルフィルターtたとえばロー
バスフィルタートシ七のカットオフ周e、数がタコパル
ス発生器の出方周et数に比例して変化するようにした
ので、テープの走行速度が低速になりて、再生信号の周
波数が低下した場合は、プログラマブルフィルターのカ
ットオフ周波数もこれに比例して低下して、搬送波は阻
止しキュー信号だけを出力するように動作する−〔実h
im)クリ 〕 第1図はこの発明の一実施例を示すブロック図で、第3
図と同一符号は同−又は相当部分金示し、(13)は増
l隔整形口路、(14ンにプロゲラマフ゛ルフィルター
、(15)はタコパルス発生器、(1(+)は高周波ク
ロック発生器、(17)にカウンタである。キュー信号
の録音は第3図の場合と同様である。タコパルス発生5
 (15)の発生するパルス周波数はテープの走行速度
に比例して大きくなり(パルス間隔はテープの走行速度
に逆比例する)カウンタ回路(17) i!タコパルス
発生5 (15)のパルス間隔中に何個の高周波クロッ
ク発生器(16)のパルスが含まれるが?計数し、高周
波クロック発生器(16)の発生するパルス周波数は一
定値(タコパルス発生器の発生するパルス周波数よジ常
に十分高い周ia)としであるので、カウンタ回路(1
7)の出力はテープ走行速度の逆数に比例するu値とな
り、したがってカウンタ回路(17)の出力の逆数に比
例するようプログラマブルフィルター(14)の周波数
特注を開側1する。
In this invention, the running speed of the tape is detected by a tacho pulse generator which generates pulses with a frequency proportional to the running speed of the tape, and the cutoff frequency e of a programmable filter t, for example, a low-pass filter, is determined by the number of pulses of the tacho pulse generator. Since it is made to change in proportion to the number of output laps, if the tape running speed becomes slow and the frequency of the playback signal decreases, the cutoff frequency of the programmable filter will also decrease in proportion to this. The carrier wave is blocked and only the cue signal is output.
[im)] Fig. 1 is a block diagram showing one embodiment of the present invention.
The same reference numerals as in the figure indicate the same - or equivalent parts, (13) is the increasing l spacing shaping port, (14 is the programmer filter, (15) is the tacho pulse generator, and (1 (+) is the high frequency clock generator. (17) is the counter.The recording of the cue signal is the same as in the case of Fig. 3.Tacho pulse generation 5
The pulse frequency generated by (15) increases in proportion to the tape running speed (the pulse interval is inversely proportional to the tape running speed).Counter circuit (17) i! How many pulses from the high frequency clock generator (16) are included in the pulse interval of tacho pulse generation 5 (15)? Since the pulse frequency generated by the high frequency clock generator (16) is a constant value (always a sufficiently higher frequency ia than the pulse frequency generated by the tacho pulse generator), the counter circuit (16)
The output of step 7) is a u value proportional to the reciprocal of the tape running speed, and therefore the frequency of the programmable filter (14) is custom-made so that it is proportional to the reciprocal of the output of the counter circuit (17).

また、キュー信号でpWM変調したイg号は七のベース
周波数としてキュー信号そのものを含んでいるので、増
幅整形回路(13)を連すだけで復調信号が情られるが
、一般にキュー信号で搬送波を変調(たとえばFM変ル
、1)した信号を再生した場合は増幅整形回路(13)
の中に復調回路を含んでいるものとする。
Furthermore, since the Ig signal that is pWM modulated with the cue signal contains the cue signal itself as the base frequency of When reproducing a modulated signal (for example, FM modulation, 1), the amplification and shaping circuit (13)
It is assumed that a demodulation circuit is included in the .

したがってiYJ幅整形回路(13)の出力にはキュー
信号、搬送波周波数信号、側帝波周波数信号等金含み、
このうちからキュー信号だけをプログラマブルフィルタ
ー(14) ’ii−辿過させる。この場合、テープの
走行速度が低速となり、搬送波周波aまでプログラマブ
ルフィルター(14) を通過することがないように(
15) 、 (16) 、 、(17)によりプログラ
マブルフィルター(14)のカットオフ周波atテープ
走行速度に比例するよう制御する。
Therefore, the output of the iYJ width shaping circuit (13) includes the cue signal, the carrier frequency signal, the side frequency signal, etc.
Of these, only the cue signal is passed through the programmable filter (14)'ii-. In this case, the running speed of the tape is slow, so that up to the carrier wave frequency a does not pass through the programmable filter (14) (
15), (16), and (17), the cutoff frequency of the programmable filter (14) is controlled to be proportional to the tape running speed.

なお、第1図はPWM変調について説明したが、FM変
調、デルタM変調等、キュー信号により搬送波全変調し
て録音する場合にはすべてこの発明全応用することがで
きる。
Although PWM modulation has been described in FIG. 1, the present invention can be applied to all methods such as FM modulation, delta M modulation, etc. when recording is performed by fully modulating the carrier wave with a cue signal.

〔発明の効果〕〔Effect of the invention〕

以上のようにこの発明によれば、 イ)低速で再生してもキュー信号=をS/N良く抽出で
きる。
As described above, according to the present invention, a) the cue signal can be extracted with a good S/N ratio even when played back at low speed.

(ol P CM記録再生圏においてPCM記録再生ヘ
ッドとそのトラックの一部金用いてキュー信号の記録再
生を付い、キュー信号により搬送波全変調したものを記
録するのでPCM記録トラックとキュー信号記録トラッ
クとの相互干渉がない。
(ol P In the CM recording/playback zone, a PCM recording/playback head and part of the track are used to record and play back cue signals, and the carrier wave is fully modulated by the cue signal and is recorded, so there are two types: PCM recording track and cue signal recording track. There is no mutual interference.

(ハ)キュー信号を低速で再生してもその搬送波が出力
されること11ない。゛    −等の効果?得ること
ができる。
(c) Even if the cue signal is reproduced at low speed, its carrier wave will not be output.゛ − etc. effect? Obtainable.

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

第1図はこの発明の一実施例を示すブロック図、第2図
は従来の装りの一例を示すブロック図、第3図は従来の
装置の他の例全示すブロック図でろる。 図において、(1)はキュー信号入力端子、(2)はキ
ュー信号出力端子、(9)はPWM変調回路、(14)
 t!プログラマブルフィルター、(15)はタコパル
ス発生器、(16)i−を高周波クロック発生器、(1
7)はカウンタ回路てろる〜尚、各図中同一符号は同−
又は相当j′i5分を示す。 代理人   大  岩  増  雄 第1図
FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a block diagram showing an example of a conventional arrangement, and FIG. 3 is a block diagram showing all other examples of the conventional apparatus. In the figure, (1) is a cue signal input terminal, (2) is a cue signal output terminal, (9) is a PWM modulation circuit, and (14) is a cue signal input terminal.
T! Programmable filter, (15) is a tacho pulse generator, (16) i- is a high frequency clock generator, (1
7) is a counter circuit.The same symbols in each figure are the same.
or equivalent j′i5 minutes. Agent Masuo Oiwa Figure 1

Claims (3)

【特許請求の範囲】[Claims] (1)搬送波をキュー信号によって変調する変調回路、
この変調回路の出力を磁気記録担体に記録する手段、上
記磁気記録担体から上記キュー信号により変調された搬
送波を再生して復調する手段、この復調された信号を含
む再生信号のうちのキュー信号だけを通過するために設
けられその周波数特性を外部から制御して変更すること
ができるプログラマブルフィルタ、上記磁気記録担体の
走行速度を検出する手段、この検出した速度に対応して
上記プログラマブルフィルタの周波数特性を制御する手
段を備えたキュー信号の再生装置。
(1) A modulation circuit that modulates a carrier wave with a cue signal;
means for recording the output of this modulation circuit on a magnetic recording carrier; means for reproducing and demodulating the carrier wave modulated by the cue signal from the magnetic recording carrier; and only the cue signal of the reproduced signal including the demodulated signal. a programmable filter provided for passing through the magnetic recording medium and whose frequency characteristics can be externally controlled and changed; means for detecting the running speed of the magnetic recording carrier; and a frequency characteristic of the programmable filter corresponding to the detected speed. A cue signal reproducing device comprising means for controlling.
(2)変調回路は、所定のパルス繰返し周期を有する搬
送波をキュー信号によりパルス幅変調を行うことを特徴
とする特許請求の範囲第1項記載のキュー信号の再生装
置。
(2) The cue signal reproducing device according to claim 1, wherein the modulation circuit performs pulse width modulation of a carrier wave having a predetermined pulse repetition period using the cue signal.
(3)変調回路は、所定の中心周波数を有する搬送波を
キュー信号により周波数変調を行うことを特徴とする特
許請求の範囲第1項記載のキュー信号の再生装置。
(3) The cue signal reproducing device according to claim 1, wherein the modulation circuit performs frequency modulation of a carrier wave having a predetermined center frequency using the cue signal.
JP59183065A 1984-08-31 1984-08-31 Reproducing device of cue signal Pending JPS6161250A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59183065A JPS6161250A (en) 1984-08-31 1984-08-31 Reproducing device of cue signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59183065A JPS6161250A (en) 1984-08-31 1984-08-31 Reproducing device of cue signal

Publications (1)

Publication Number Publication Date
JPS6161250A true JPS6161250A (en) 1986-03-29

Family

ID=16129130

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59183065A Pending JPS6161250A (en) 1984-08-31 1984-08-31 Reproducing device of cue signal

Country Status (1)

Country Link
JP (1) JPS6161250A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0875890A2 (en) * 1997-04-28 1998-11-04 Nec Corporation Cue signal detection circuit of magnetic recording and reproducing device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0875890A2 (en) * 1997-04-28 1998-11-04 Nec Corporation Cue signal detection circuit of magnetic recording and reproducing device
EP0875890A3 (en) * 1997-04-28 2000-01-19 Nec Corporation Cue signal detection circuit of magnetic recording and reproducing device
US6141171A (en) * 1997-04-28 2000-10-31 Nec Corporation Cue signal detection circuit of magnetic recording and reproducing device

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