JPS5813100A - Stereo signal reproducing device - Google Patents

Abstract

PURPOSE:To satisfactorily separate a stereo signal, by offsetting a character signal in reproduced signals from one track by the character signal in reproduced signals from the other track. CONSTITUTION:The left and right channel signals are recorded on the left and right channel tracks AL, AR, BL, and BR on the A face and B face of a tape 1, respectively. On clearance parts 4L and 4R between recording parts 2L, 2R, 3L, and 3R, encoded character signals are recorded in such a way that the character signals recorded on the left channel track AL will have the inverse polarity against the character signals recorded on the right channel track AR. By mixing reproduced channel signals, the character signals are offset and only stereo signals are separated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stereo signal reproducing device suitable for reproducing a stereo signal and a character signal from a recording medium in which each signal is recorded on the same track. Karaoke is one of the most popular ways to use it. Everyone has at least once had the desire to sing with orchestral accompaniment, but
Conventionally, this desire has been satisfied except in special cases such as participating in a broadcast program.

Karaoke satisfies this desire to some extent. This is done by recording only the accompaniment of the song on tape.
It was designed to allow anyone to sing along to the accompaniment while playing the music, and as long as you have a teffreire, you can buy tapes with the accompaniment of the song at a low price, so anyone can enjoy it. Moreover, since the sound quality of recent tape recorders is good, especially in the case of stereo, it is as good as a live orchestra and allows you to immerse yourself in the atmosphere of singing in front of an orchestra. In addition, the tapes are also made into cassettes, making it easy to operate the player, making it easy to install the player. - It doesn't take up much space and is used for entertainment.

As described above, tape recorders are useful as entertainment devices, but they have one major problem.

This means that only accompaniment can be recorded on tape, and lyrics must be recorded in other ways, such as on cards or books. For this reason, if you want to sing at your favorite poetry gathering, you only need to know the lyrics, but if you don't, you have to search for the tape with the accompaniment and the lyrics, which is a hassle.

Therefore, it is conceivable to record the accompaniment audio signal and the literary signal representing the poem on the same tape, reproduce the character signal tube, and display the poem on the display device. Since it is necessary to expand the tape and run it at high speed, there is a disadvantage that the number of songs that can be recorded on a single tape increases. Furthermore, even if audio signals and character signals are recorded on a tape in a common frequency band so that there is no need to expand the recording band of the tape,
This method has the disadvantage of requiring a complicated circuit in order to separate the audio signal from the reproduced signal without deteriorating it.
(An object of the present invention is to eliminate the drawbacks of the prior art described above, record character signals of the same information content with mutually different polarities on two tracks on which stereo signals are recorded, and process the reproduced signal from the recording medium. To provide a stereo signal reproducing device which has a simple configuration and can separate each signal without deteriorating them.

To achieve this object, the present invention provides a point t at which the character signal in the reproduced signal from one track can be offset by the character signal in the reproduced signal from the other track to separate the stereo signal. 'Featured.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram showing a recording pattern of a recording medium on which signals to be reproduced by a stereo signal reproducing apparatus according to the present invention are recorded, and 1 is a tape.

AL, AR are the left and right channel tracks of tape A side, B
L, Left and right channel tracks of Bull tape B side,
2L and 2R are the parts where the left and right channel signals of the stereo signal 1 are recorded, 3L and 3R are the parts where the left and right channel signals of the other stereo signals are recorded, and 4L and 4R are the parts where the two stereo signals are recorded. It is a gap.

FIG. 2 is a waveform diagram showing a character signal.

Next, each signal recorded on the tape will be explained.

In FIG. 1, on side A of the tape 1, a left channel signal of a stereo signal is recorded on a left channel track AL Vc, and a right channel signal is recorded on a right channel track ARK. Also, on page 8 #i, the left and right channel signals of the stereo signal are also displayed on the left and right channel tracks BL and BR.
1C has been recorded.

On tape 1, the stereo signals of many songs are recorded, and on the left and right channel tracks AL and AR, the stereo signals of the song 1 are recorded on recording portions 2L and 2R, and on the recording portion 3L. , 3R have stereo signals of other songs recorded, and there are gaps 4L, 4 between these recorded parts.
R is provided. And those gap parts 4L, 4
The coded character signal is recorded in the RK. A pilot signal may be recorded immediately before the character signal to identify the character signal.

Figure 2 shows the waveform of the character signal, and (1) in the figure shows the interval t.
14r;, the same figure (2) is marked in the gap JRK,
These character signals have opposite polarities to each other.

In addition, between songs! If i4L and 4R are set to about 10 seconds, the third verse can be recorded sufficiently. The number of characters in the poem is at most 60 to 70, and there are about 200 types of characters, so if each character is represented in 13 bits, there is enough time to include information for coloring the characters. Then, if a micro combiator with a baud rate of 1000 bits/second is used to display the characters, the above poem will be 4
~5 seconds, and even if the same character signal is recorded twice to prevent errors, 10 seconds is sufficient.
・□ Recorded between @4L and 4H 1□ name Figure 2 (1-), (2
) The frequency band of the character signal is the same track AL.

to match the high frequency band of the stereo signal recorded on the stereo signal. Therefore, there is no need to provide a special recording band for recording character signals.

FIG. 3 is a block diagram showing an embodiment of the stereo signal reproducing device according to the present invention, in which 7L and 7R are reproduction heads;
8L and 8R are amplifiers, 9L and 9R are output terminals, 10 company signal processing devices, 20 is a mixing circuit, 30 is a display device, 21 and 22 are resistors, and 23 is a capacitor.

FIG. 4 is a block diagram showing the signal processing device 10 of FIG.
2 is a character signal detection device, 13 is a storage device, 14 is a character generator, 16 is a synchronization signal generator, and 17 is a video signal synthesis device.

The playback head 7R scans the left channel tracks AL and BLt of tape 1, and the playback head 7R scans the right channel tracks AR and BR1.
-Scanning and generating reproduction signals respectively.

Each playback signal is the left channel signal of the stereo signal.
□ and right channel signals, each playback head 7L.

7R is in between! When scanning 14L and 4B, k includes a character signal tube.

These reproduced signals are amplified by amplifiers 8L and 8R, respectively, and supplied to a mixing circuit 20 to obtain a left channel signal and a right channel signal at output terminals 9I, 91. Furthermore, the reproduced signal that has been amplified by one of the amplifiers 5L-t' is supplied to the signal processing device 10, where the character signal is detected and processed to generate an image signal, which is then supplied to the display device 30, where the characters are displayed. Ru.

In Figure 4, when a pilot signal immediately before a character signal is detected from the reproduced signal supplied to the signal processing circuit 10, a character signal detection device 12 which is controlled by a control signal 15 is activated by an arithmetic unit 11. The encoded character signals are separated and stored in the storage device 13. When the output terminals 9L and '9R (Fig. 3) K left channel signal and right channel signal are obtained, the character signal is read out from the storage device 13 and supplied to the character generator 14 to be converted into a character signal code. A pm signal representing the corresponding character is generated. This video signal is supplied to a video signal synthesis device 17, where it is synthesized with a synchronization signal generated by a synchronization signal generator 16 and supplied to a display device 30 (FIG. 3) K.

The operation of the mixing circuit 20 shown in FIG. 3 will be explained.

A resistor 21 inserted in the mixing circuit 20#i, a transmission line for the reproduced signal amplified by the amplifier 8L, a resistor 22 inserted in the transmission line for the reproduced signal amplified by the amplifier 8R, and a resistor 22 inserted in the transmission line for the reproduced signal amplified by the amplifier 8R. Capacitor connected between those transmission lines? It consists of 23.

The capacitor 23 is in a cutoff state in the low frequency band of the reproduced signal and in a shorted state in the high frequency band. Therefore, the amplifier 8
The low frequency component of the reproduced signal from L is output as it is to output terminal 9LK.
However, the high-frequency component passes through the capacitor 23t and is also supplied to other reproduction signal transmission lines. The same goes for the reproduced signal from the amplifier 8R; its low-frequency components are supplied as they are to the output terminal 9R, but the high-frequency components pass through the capacitor 23t and are also supplied to other transmission lines. By the way, since a character signal is included in the high frequency range of the reproduced signal, the fact that the high 1Ij two components of the reproduced signal from the amplifier 8L are supplied to another transmission line through the capacitor 23 means that the amplifier 8R This means that the high frequency component of the reproduced signal from the amplifier 8L is added to the reproduced signal from the amplifier 8L, and the character signal is also added to the reproduced signal from the amplifiers 8L and 8R. Since the polarities of
This is canceled out by the character signal in the reproduced signal from L, and as a result, only the right channel signal of the stereo signal is obtained at the output terminal 9RK.

Similarly, the character signal in the reproduced signal from amplifier 8L is canceled by the character signal in the reproduced signal from amplifier 8R,
Only the left channel signal of the stereo signal is obtained at the output terminal 9L.

FIG. 5 is a diagram showing the state of the mixing circuit 20. In the same figure, the same parts as in FIG. 3 are given the same reference numerals), and 24 is a signal source that supplies the reproduced signal Lf)E from the amplifier 8L shown in FIG.
It includes the input side of the mixing circuit 20 all at once, and 25 also includes the reproduced signal eB FC from the amplifier 8R.
This is the signal source for the・'Lte'R is the low frequency component of the reproduction signals ・L and ・R, respectively, and ・L and ・3 are the reproduction signals eL, respectively.

This is the high frequency component of eB.

Figure 5 (A) shows the reproduced signal L, ! The state of the mixing circuit 20 is shown in FIG. 3, which is the same as that in FIG.

As for the low frequency components 'L, .'R of the reproduced signal L9elL, due to the action of the capacitor 230, the state of the mixing circuit 20 is as shown in FIG. The low frequency component @'L I 1''R appears directly at the output terminals 9L and 9Rk.

Next, the high frequency component e"Lle' of the reproduced signal @L I eB
Regarding RK, due to the action of the capacitor 230, the state of the mixing circuit 20 is k as shown in FIG.
A part of the high frequency component /R is added to a part of the high frequency component e#L.

For character signals, since CNL=-〇″R, (
・“L+・“R)/2=0” and output terminal SL.

No character signal appears in 9R.

The character signal can be removed in this way, but the high frequency components of the stereo signal can also be removed from the output terminal 9L,
At 9H, a composite of the left and right channel signals is obtained, and when the signal becomes monaural, it becomes K. However, although human hearing is highly sensitive from several hundred Hz to 2 to 3 kHz, it is less sensitive in other areas, and in high-frequency areas, even if stereo becomes monaural, music playback is essentially affected by the left manuscript. There is no. Therefore, the frequency band of the character signal is made to match the high frequency band of the stereo signal, and the mixing circuit 20
The capacitance t of the capacitor 23 is set to pass this frequency band.

By the way, when such a playback device plays back a tape with a stereo signal on which normal character signals are not recorded, it may not be desirable for the high range of the stereo signal to become a monaural signal. As shown in FIG. 6, an open/close switch 24 is provided in the mixing circuit 20° in series with the capacitor 23, and the Fi open/close switch 241 is opened when playing back a stereo signal recording tape in which character signals are not recorded as shown in FIG. , it is possible to obtain the correct left and right channel signals at the output terminal.Also, in the above embodiment, a tape was described as the recording medium, but the present invention can also be applied to a recording medium such as a disk. Further, a filter may be used in place of the bladder sensor 23 in the mixing circuit 20. However, in that case, the circuit configuration becomes somewhat complicated, but the complexity is not exceptional.Furthermore, The application is not limited to the playback of a tape on which a character signal is recorded between two songs, but can also be applied to a tape on which a character signal is recorded mixed with a stereo signal. In this case, signal processing In the device IO, the reproduced character signal tube may be segmented and stored in the storage device 13, read out sequentially, and displayed on the display device 30.

As explained above, according to the present invention, it is possible to easily separate a stereo signal and a text signal that have a common frequency band using a simple configuration, and when separating, stereo audio has a high frequency band. Since it takes advantage of the fact that even monaural audio does not particularly affect human hearing, it does not degrade stereo sound, and furthermore, by simply adding an on/off switch, it can be used for normal stereo playback. Since the present invention can reproduce the high frequency range in stereo, and can reproduce high-quality stereo sound in this manner, it is possible to provide a stereo signal reproduction device with excellent functions at a low cost without the drawbacks of the conventional technology.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a recording pattern of a recording medium reproduced by a stereo signal reproducing apparatus according to the present invention;
Figures 2 (1) and (2) are waveform diagrams of character signals, Figure 3 is a block diagram showing an embodiment of the stereo signal reproducing device according to the present invention, and Figure 4 is an implementation of the signal processing device. FIG. 1772 shows an example, and FIGS. Yes. 7L, 7R...playback head, 10...
Signal processing device, 20...Mixing circuit, 23
・・・・・・Capacitor, 24・Old・Open/close switch. Agent Patent Attorney Takeshi Kenjibe (and 1 other person) Figure 1 Figure 2 tiA Figure 4 Figure 5 n Figure 6'----''2゜

Claims (1)

[Scope of Claims] (1) A recording medium in which a right channel signal and a character signal are recorded on one track, and a left channel signal and a character signal obtained by inverting the polarity of the character signal on the other track. In a stereo signal reproducing device for reproducing the respective signals, a mixing circuit is supplied with the reproduction signals from the respective tracks and outputs the right channel signal and the left channel signal, and a mixing circuit is supplied with one of the reproduction signals and processes the character signal. 1. A stereo signal reproducing apparatus, characterized in that the mixing circuit is configured to be able to cancel out a character signal of the reproduced signal with a character signal separated from the reproduced signal and having a different polarity. C) In claim 1, the mixing circuit is formed by a character signal band pass circuit connected between the transmission paths of the respective reproduced signals, and the character signals are mutually passed from one of the transmission paths to the other. A stereo signal reproducing device characterized in that it is configured to enable. (3) In claim 1, the mixing circuit comprises a character signal band pass path and an opening/closing circuit connected in series between the transmission paths of the respective reproduced signals, A stereo signal reproducing device characterized in that the tubes are configured such that they can pass through or be cut off from each other from one side to the other. (4) In claim 2 or 3,
A stereo signal reproducing device characterized in that the character signal bandpass circuit is constituted by a capacitor.