JPH06267003A - Information signal recording device - Google Patents

Abstract

PURPOSE:To record data signal without any interruption of audio signal and to achieve detection without hearing the data signal as audio signal on reproduction. CONSTITUTION:Audio signal is recorded at least in one track of two tracks of a recording medium by recording medium by recording heads 4 and 5 for left and right channels and at the same time a first data signal which is different from the audio signal and a second data signal for canceling the first data signal are recorded at two tracks. In this case, first and/or second data signal are superposed on the audio signal at least in one track where the audio signal is recorded by a mixer 3 for recording.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information signal recording device.

[0002]

2. Description of the Related Art A tape recorder is one of the information signal recording devices. The original purpose of the tape recorder is to record / reproduce an audio signal. However, there is a tape recorder that can record a data signal including a cue signal for information retrieval and a signal indicating a recording time on a magnetic tape together with the audio signal.

Japanese Unexamined Patent Publication No. 60-15882 discloses an example of recording both a voice signal and a data signal on a magnetic tape. That is, two tracks are provided on a magnetic tape, and audio signals as identification signals having opposite phases and having the same amplitude at the same frequency are recorded on these tracks, and alternating currents having the same amplitude at the same frequency and having the same phase. The signal is recorded as a data signal.

By recording in this way,
When two tracks are reproduced by the monaural head, the data signals in phase with each other are reproduced as a sum signal, but the identification signals with phases opposite to each other are canceled and become almost zero. Therefore, the identification signal does not adversely affect the reproduced data signal.

[0005]

However, the above-mentioned Japanese Patent Laid-Open No. 60-15882 considers the recording of information on a soft cassette tape used as an external storage device of a computer or the like, and the contents to be recorded. Is mainly a data signal and a voice signal is merely added as an identification signal. Therefore, there is no disclosure about a recording method for mainly recording an audio signal.

The information signal recording apparatus of the present invention has been made in view of such a problem, and its purpose is to superimpose a data signal on an audio signal so that the audio signal is not interrupted. An object of the present invention is to provide an information signal recording device capable of recording a data signal and detecting the data signal at the time of reproduction without hearing as a voice.

[0007]

In order to achieve the above object, the information signal recording apparatus of the present invention comprises an audio signal recording means for recording an audio signal on at least one of two tracks of a recording medium. A first data signal different from the audio signal is recorded on the one track, and a second data signal for canceling the first data signal is recorded on the other track, and at least one of the at least one track is recorded. When the audio signal is recorded on the track, there is provided data signal recording means for recording the audio signal by superimposing the first and / or second data signal on the audio signal.

[0008]

That is, in the information signal recording apparatus of the present invention, the first data signal different from the audio signal and the second data signal for canceling the first data signal are provided on two tracks of the recording medium. Record each. And this 2
When the audio signal is recorded on at least one of the two tracks, the first or / and second data signal is superimposed on the audio signal and recorded.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the information signal recording apparatus of the present invention is applied to a tape recorder will be described below with reference to the drawings.

FIG. 1 is a diagram showing a configuration of a recording circuit of the tape recorder according to the first embodiment. In the figure, the microphone 1 is connected to the first input terminal of the mixer 3 via the amplifier 2. A data signal generator 6 for generating a data signal including a cue signal for information retrieval and a signal representing a recording time is connected to the second input terminal of the mixer 3 and is connected to the R channel (hereinafter, simply (Referred to as Rch) is connected to the-terminal of the recording head 5. The + terminal of the Rch recording head 5 is grounded.

Further, the output terminal of the mixer 3 is connected to the + terminal of the recording head 4 for the L channel (hereinafter, simply referred to as Lch). The-terminal of the Lch recording head 4 is grounded. In this way, the winding directions of the Lch and Rch recording heads 4 and 5 are connected so as to be opposite to each other, whereby signals input to the recording heads 4 and 5 have opposite phases. It will be.

In the above structure, the audio signal input to the microphone 1 is amplified by the amplifier 2 and input to the first input terminal of the mixer 3. On the other hand, the data signal generated by the data signal generator 6 is supplied to the second input terminal of the mixer 3 and also to the Rch recording head 5 to be recorded on the R track of the magnetic tape. At this time, the data signal supplied to the Rch recording head 5 has a waveform as shown in FIG. Further, the audio signal and the data signal input to the mixer 3 are combined by the mixer 3, so that a signal in which the data signal is superimposed on the audio signal is an Lch recording head as shown in FIG. 4 and is recorded on the L track of the magnetic tape as a recording medium.

FIG. 3 is a diagram showing the structure of a reproducing circuit for reproducing the information thus recorded. In the figure,
The + terminal of the Lch reproducing head 10 is connected to the first input terminal of the mixer 14 via the amplifier 1 (12).
The-terminal of the Lch reproducing head 10 is grounded. R
The + terminal of the ch reproducing head 11 is connected to the second input terminal of the mixer 14 via the amplifier 2 (13), and
It is connected to the data detector 16. The-terminal of the Rch reproducing head 11 is grounded. The output terminal of the mixer 14 is connected to the speaker 17 via the amplifier 3 (15). In the above configuration, at the time of reproduction, a signal in which the data signal is superimposed on the audio signal is generated at the + terminal of the Lch reproducing head 10. The superimposed signal is generated by the amplifier 1
It is amplified in (12) and sent to the mixer 14. Also, Rc
A data signal is generated at the + terminal of the reproducing head 11 for h, amplified by the amplifier 2 (13), and supplied to the mixer 14. Here, the amplification factors of the amplifier 1 (12) and the amplifier 2 (13) are set to be the same. Therefore, when the mixer 14 combines the superimposed signal and the data signal, the data signals from both channels have the same level and opposite phases to each other and thus cancel each other, as shown in FIG. Only the audio signal is output from the mixer 14. This audio signal is amplified by the amplifier 3 (15) in the next stage and output as audio from the speaker 17. Also, the amplifier 2
A data signal having a waveform as shown in FIG. 4B is output from (13). This data signal is input to the data detector 16 and detected, and the content is read.

As described above, in the first embodiment, by using the two tracks R and L, the audio signal is recorded on only one track, and the data signal is recorded on the track on which the audio signal is recorded. And superimpose it on the recording.
Further, in order to cancel the superimposed data signal, a reverse phase data signal is recorded on the track where the audio signal is not recorded.

When the information thus recorded is reproduced, the audio signals are amplified at the same level for both tracks. As a result, even if there is a data signal in the middle of the audio signal, they cancel each other out so that they will not be heard as audio. Moreover, since the data signal is superimposed on the audio signal, the audio signal is not interrupted.

Further, since the data signal is reproduced only from the track on which the data signal is recorded, the data signal can be detected separately from the audio signal and erroneous determination can be eliminated. Further, even if the frequency of the data signal is in the voice band, it is canceled as described above, so that it does not overlap with the voice signal.

Also, when the information thus recorded is reproduced by another tape recorder having a monaural head, the sound can be heard normally, but the data signal is canceled within the track width of the monaural head. It will not be heard as voice because it will be

In the above-described first embodiment, when the data signal is superimposed on the voice signal and recorded on the magnetic tape, the peaks of the voice signal and the data signal may overlap with each other to cause a large magnetic flux density. In this case, the sound becomes distorted when reproduced too close to the magnetic saturation level of the magnetic tape. In addition, the data signal may cause peak shift, and the reverse phase relationship of the signals between both channels, that is, the Lch and the Rch may be broken. A second embodiment for solving such a problem will be described below.

FIG. 5 is a diagram showing the configuration of the recording circuit of the tape recorder according to the second embodiment of the present invention. The configuration of this embodiment is similar to that of FIG. 1 except that a transistor Tr and this transistor Tr are provided between the microphone 1 and the amplifier 2.
It is the same as the first embodiment except that an attenuating circuit 7 as an attenuating means consisting of a resistor r connected to the base of is inserted.

In such a configuration, the data signal from the data signal generating circuit 6 is applied to the transistor T of the attenuating circuit 7.
Attenuator circuit 7 when supplied to the base of r through resistor r
Is turned on, the voice signal from the microphone 1 is attenuated by a predetermined amount by the attenuator circuit 7, for example, 5 dB, and input to the amplifier 2. Therefore, in this embodiment, the audio signal from the microphone 1 is recorded on the magnetic tape by the Lch recording head 4 while being attenuated by a predetermined amount. Other operations are the same as those in the first embodiment. When there is no output from the data signal generator 6, the attenuating circuit 7 does not operate, so the audio signal from the microphone 1 is recorded on the magnetic tape without being attenuated.

FIG. 6 is a diagram showing the structure of a reproducing circuit for reproducing the information thus recorded. The structure of this regeneration circuit is similar to that of the amplifier 3 (1
The variable amplifier 18 is used instead of 5), and the amplifier 2 (1
The third embodiment is the same as the first embodiment except that the output of 3) is also connected to the variable amplifier 18.

In the above configuration, the variable amplifier 18 is
It operates while receiving the data signal detected by the Rch reproducing head 11, and amplifies the audio signal detected by the Lch reproducing head 10 by the amount attenuated by the attenuation circuit 7 in FIG. 5, that is, 5 dB. Speaker 1
Supply to 7. Other operations are the same as those in the first embodiment.

When the variable amplifier 18 does not receive the output from the data signal generator 6, the amplifier 3 (15) shown in FIG. 3 is used.
The audio signal is amplified with the same amplification factor as that of No. 1 and is supplied to the speaker 17.

As described above, in the second embodiment, when the data signal is recorded, the recording level of the audio signal is attenuated by a predetermined amount, for example, 5 dB, and the recording is performed so as not to reach the saturation level. When the audio signal recorded in this manner is reproduced, the data signal is detected to increase the amplification rate of the audio signal by the amount attenuated only when it is determined that the data signal is written, that is, 5 dB. To do so. By doing this, the volume is constant,
You can hear unnatural and undistorted audio.

FIG. 7 is a diagram showing the structure of a recording circuit of an information signal recording apparatus according to the third embodiment of the present invention. In the figure, the microphone 1 is connected to the amplifier 2, and the amplifier 2 is connected to the first input terminal of the mixer 1 (3a) and also to the first input terminal of the mixer 2 (3b). There is. Further, the data signal generator 6 for generating the data signal is connected to the second input terminal of the mixer 1 (3a), and is also connected to the second input terminal of the mixer 2 (3b) via the phase inverter 8. Is also connected to. The output terminal of mixer 1 (3a) is L
It is connected to the + terminal of the recording head 4 for ch, and the mixer 2 (3
The output terminal of b) is connected to the + terminal of the Rch recording head 5.

As is apparent from the above-mentioned structure, in the third embodiment, both the audio signal and the data signal are supplied to the Lch recording head 4 and the Rch is supplied.
The recording head 5 is also supplied and recorded. Here, the audio signal is recorded in the same phase on both the Lch and Rch, but the data signal passes through the phase inverter 8 on the Rch side, so
It is recorded in the opposite phase to ch. The waveform of the recording signal at this time is shown in FIGS.

FIG. 8 is a diagram showing the structure of a reproducing circuit for reproducing the information thus recorded. In the figure, the + terminal of the Lch reproducing head 10 is an amplifier 1 (1
2) and the amplifier 1 (12) is connected to the mixer 1 (14
the mixer 2 connected to the first input terminal of a)
It is connected to the first input terminal of (14b). Rch
The + terminal of the reproducing head 11 is connected to the amplifier 2 (13), the amplifier 2 (13) is connected to the second input terminal of the mixer 1 (14a), and the mixer is also connected via the phase inverter 19. 2 (14b).

The output terminal of the mixer 1 (14a) is the amplifier 3
It is connected to the speaker 17 via (15) and the mixer 2
The output terminal of (14b) is directly connected to the data detector 16.

In such a structure, Lch, Rch
Regarding the two audio signals reproduced by the reproducing heads 10 and 11, the Lch and Rch signals are the mixer 1 (14
Although the two audio signals are combined and output in a), the two audio signals have the same phase and are added and output to the speaker 17. On the other hand, since the two data signals have opposite phases, the mixer 1 (1
When they are combined in 4a), they are canceled out and not output from the speaker 17.

On the other hand, of the two audio signals, the audio signal reproduced by the Rch reproducing head 11 is the phase inverter 1.
Since the phase is inverted at 9, the mixer 2 (14b) cancels it when it is combined with the audio signal from Lch and is not output to the data detector 16. On the contrary,
The data signal from the Rch is phase-inverted by the phase inverter 19 and becomes in phase with the data signal from the Lch in the mixer 2 (14b).
Is output to. 10A and 10B show waveforms of the audio signal and the data signal reproduced in this way.

As described above, in the third embodiment, both the audio signal and the data signal are the Lch recording head 4.
Is also supplied to the Rch recording head 5 for recording. Then, at the time of reproduction, the added audio signal is supplied to the speaker 17 and the added data signal is supplied to the data detector 16, so that a high-level audio output is obtained and the level of the data signal is obtained. Is also large, so detection is reliable.

In the first and second embodiments described above, the Lch recording head 4 constitutes an audio signal recording means, and the Lch recording head 4 and the Rch recording head 5 are provided.
And constitute a data signal recording means. Further, in the third embodiment, the Lch recording head 4 and the Rch recording head 5 constitute the audio signal recording means and the data signal recording means.

Further, in the above-mentioned first, second and third embodiments, the L and R tracks of the magnetic tape may not be composed of one track each, and each may include a plurality of tracks. Good. That is, it suffices that the entire signals recorded on the plurality of tracks are of the same quality as the signals recorded on the L and R tracks, respectively.

[0034]

As described above in detail, according to the information signal recording apparatus of the present invention, a data signal can be recorded without interrupting the audio signal and can be detected without hearing the audio as a voice during reproduction. .

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a recording circuit of a tape recorder according to a first embodiment.

FIG. 2 is a diagram showing waveforms of recording signals supplied to recording heads for Lch and Rch.

FIG. 3 is a diagram showing a configuration of a reproducing circuit of the tape recorder in the first example.

FIG. 4 is a diagram showing waveforms of reproduced audio signals and data signals.

FIG. 5 is a diagram showing a configuration of a recording circuit of a tape recorder according to a second embodiment.

FIG. 6 is a diagram showing a configuration of a reproducing circuit of the tape recorder in the second example.

FIG. 7 is a diagram showing a configuration of a recording circuit of a tape recorder according to a third embodiment.

FIG. 8 is a diagram showing a configuration of a reproducing circuit of a tape recorder in a third example.

FIG. 9 is a diagram showing waveforms of recording signals supplied to recording heads for Lch and Rch.

FIG. 10 is a diagram showing waveforms of reproduced audio signals and data signals.

[Explanation of symbols]

1 ... Microphone, 2 ... Amplifier, 3 ... Mixer, 4 ... Lch recording head, 5 ... Rch recording head, 6 ... Data signal generator.

Claims (2)

[Claims] 1. An audio signal recording means for recording an audio signal on at least one of two tracks of a recording medium; a first data signal different from the audio signal on the one track; and the other. A second data signal for canceling the first data signal is recorded on the track No., and when the audio signal is recorded on the at least one track, the first or / or the audio signal is recorded. And the second
An information signal recording device, comprising: a data signal recording unit that superimposes and records the data signal of. 2. The information signal recording apparatus according to claim 1, further comprising an attenuating unit for attenuating a recording level of the audio signal by a predetermined amount when the data signal is recorded.