JP3353337B2 - Magnetic tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape recording device such as a video tape recorder used for a dubbing slave device.

[0002]

2. Description of the Related Art In recent years, the soft tape dubbing industry has
With the spread of the video tape rental market, the number of soft tape dubbing turns has increased, and dubbing companies have installed a large number of magnetic tape recording devices to deal with them. However, since the installation space is limited, there is a demand for a magnetic tape recording apparatus for a slave that is easy to connect and does not take up space for connection.

A conventional magnetic tape recording device will be described below. FIG. 2 is a block diagram of a main part showing a configuration of a conventional magnetic tape recording apparatus. 21 is a general audio channel 1 (hereinafter referred to as normal audio CH1) input, 22 is a normal audio CH1 recording / amplifying circuit, 23 is a normal audio CH1 fixed head, and 24 is a normal audio channel 2
(Hereinafter referred to as a normal audio CH2) input, 25 is a normal audio CH2 recording / amplifying circuit, 26 is a normal audio CH2
2 fixed head, 27 is a high fidelity audio CH1 (hereinafter Hi
Fi audio CH1) input, 28 is HiFi audio CH
One modulation circuit 29 is a high-fidelity audio CH2 (hereinafter referred to as HiF
i voice CH2) input, 30 is HiFi voice CH2
Modulation circuit, 31 is a HiFi audio recording / amplifying circuit, 32 is H
An iFi audio rotary head, 33 is a control signal input, and 34 is a control circuit.

[0004] The operation of the magnetic tape recording apparatus configured as described above will be described below with reference to the drawings.

When the magnetic tape recording apparatus enters the dubbing state by operating the control circuit 34 according to the control signal from the control signal input 33 and the mode instruction, the normal audio CH1 input 21 and the normal audio CH2 input are applied to the normal audio section. 24, a signal is input, and the normal sound C
The H1 recording amplification circuit 22 and the normal audio CH2 recording amplification circuit 25 amplify the normal audio CH1 fixed head 2
3. Normal sound CH2 is recorded on the track in the longitudinal direction of the magnetic tape by the fixed head 26. For the HiFi audio section, signals are input from the HiFi audio CH1 input 27 and the HiFi audio CH2 input 29, and the HiFi audio CH is input.
1 modulation circuit 28 and the HiFi audio CH2 modulation circuit 30, and the mixed signal is amplified by the HiFi audio recording / amplifying circuit 31.
At 2 the data is recorded on the magnetic tape on the helical.

[0006]

However, when the above-described conventional apparatus is used for dubbing, one magnetic tape recording apparatus requires one control signal cable and four audio signal cables to be connected, and a large number of connections are required. When the magnetic tape recording device is installed, there is a problem that the space occupied by the connection cable and the loss of the cable cost are large.

The present invention solves the above-mentioned problems, and eliminates the need for connecting a control signal cable to a magnetic tape recording device for dubbing, reduces the number of connected audio signal cables, and greatly reduces space and cable cost. It is an object of the present invention to provide a magnetic tape recording device which can be improved.

[0008]

According to the present invention, there is provided a signal amplifying circuit for amplifying an external frequency-modulated signal input, and a band-pass filter for limiting a normal voice carrier frequency band of the amplified signal. A demodulation circuit for demodulating a band-limited signal, a recording amplification circuit for amplifying the demodulated signal, a normal audio section including a normal audio fixed head for recording the amplified signal, and a signal amplified by the signal amplification circuit , A band-pass filter for limiting the frequency band of the HiFi audio carrier, a recording amplifier circuit for amplifying the band-limited signal, and a HiF for recording the amplified signal
a HiFi audio section including an i audio rotating head, a band-pass filter for limiting a control signal carrier frequency band of a signal amplified by the signal amplifier circuit, a demodulation circuit for demodulating the band-limited signal, and a waveform for the demodulated signal It has a configuration including a waveform shaping circuit for shaping, and a control circuit for instructing a mode by a signal obtained by shaping the waveform.

[0009]

According to the present invention, the connection of the control signal cable to the magnetic tape recording apparatus is not required, and the number of connected audio signal cables can be reduced from four to one per one.

[0010]

FIG. 1 is a block diagram of a main part of a magnetic tape recording apparatus according to one embodiment of the present invention.

1 is a frequency modulation signal input, 2 is a signal amplification circuit for amplifying the frequency modulation signal, and 3 is a normal sound CH1.
A band-pass filter (1) for limiting the band of the carrier frequency; 4, a demodulation circuit (1) for demodulating the band-limited normal CH1 signal; and 5, a recording amplifier circuit (1) for amplifying the demodulated normal CH1 signal; 6 is normal voice C
H1 fixed head, 7 is a band-pass filter (2) that limits the band of the normal sound CH2 carrier frequency, 8 is a demodulation circuit (2) that demodulates the band-limited normal CH2 signal, and 9 is the demodulated normal CH2 signal. A recording amplifier circuit for amplification (2), 10 is a fixed head for a normal audio CH2, 11 is a band-pass filter (3) for limiting the band of a HiFi audio CH1 carrier frequency, and 12 is a recording amplifier circuit for amplifying a HiFiCH1 signal whose band is limited. (3), 13 are HiFi audio CH1 rotary heads, 14 is a band pass filter (4) that limits the band of the HiFi audio CH2 carrier frequency, and 15 is a band-limited HiF.
The recording amplifier circuit (4) for amplifying the iCH2 signal, 16 is H
iFi audio CH2 rotary head, 17 is a band pass filter (5) for limiting the band of the control signal carrier frequency, 1
8 is a demodulation circuit (3) for demodulating the band-limited control signal, 19 is a waveform shaping circuit for shaping the waveform of the demodulated control signal, and 20 is a control circuit for giving a mode instruction based on the waveform-shaped signal.

In the magnetic tape recording apparatus comprising the above components, the relationship between the components and the operation will be described below.

A frequency-multiplexed normal, HiFi audio signal and a control signal frequency-modulated from a frequency-modulated signal input 1 are input, amplified by a signal amplifier circuit 2, and band-limited to each carrier frequency. , 14, and 17 are input to the bandpass filters. The signal band-limited to the control signal carrier frequency by the bandpass filter (5) is demodulated by the demodulation circuit (3), the waveform is formed by the waveform shaping circuit 19, and the magnetic tape is formed by the control circuit 20. A mode instruction is given to the recording device. Control circuit 20
When the apparatus enters the dubbing state according to the mode instruction, the signals amplified by the signal amplifier circuit 2 are transmitted to the normal sound section by the band-pass filters (1) and (2) of the normal sounds CH1 and CH2. The signal is divided into frequency bands and demodulated by 4, 8 demodulation circuits (1) and (2), respectively. The demodulated normal audio CH1 and CH2 signals are amplified by the recording amplification circuits (1) and (2) of 5, 9 and recorded on the magnetic tape by the 6,10 normal audio CH1 and CH2 fixed heads, respectively. . For the HiFi audio section, the signal amplified by the signal amplification circuit 2 is converted to H by the band-pass filters (3) and (4) of 11 and 14.
Divided into the carrier frequency bands of the iFi audio channels CH1 and CH2, amplified by the recording amplifier circuits (3) and (4) of 12, 15 and hi-fi audio channels CH1 and CH2 of 13 and 16.
Each is recorded on a magnetic tape by a rotating head.

As described above, according to the magnetic tape recording apparatus of the present embodiment, since the frequency-modulated audio signal and the control signal are input to the magnetic tape recording apparatus, the number of audio signal connection cables during dubbing is increased. And the connection of the control signal cable becomes unnecessary, and the loss in space and cost can be greatly improved.

Next, a second embodiment will be described. According to the present invention, by inputting a frequency-modulated signal having n times the carrier frequency to a magnetic tape recording device, the mode of the device can be designated, and a signal of four channels of audio can be inputted and recorded. An object of the present invention is to provide a device that does not require connection of a signal cable and can record an audio signal at n times speed. The configuration and operation are the same as those described in the first embodiment. .

As described above, according to the present embodiment, by inputting the frequency-modulated signal of n times the carrier frequency to the magnetic tape recording apparatus, the mode of the apparatus can be designated, and the signal of four channels of audio is input. In addition, since recording can be performed, connection of a control signal cable is not required, and recording of an audio signal can be performed at n times speed, n times recording efficiency can be obtained in the conventional recording time, and space can be obtained. , It is possible to greatly reduce the cost loss.

[0017]

As apparent from the above embodiments, according to the present invention, it is not necessary to connect a control signal cable to a slave magnetic tape recording apparatus for dubbing, and the number of connected audio input signal cables is four per unit. To one, and a magnetic tape recording apparatus can be provided which greatly reduces space and cable cost loss due to cable occupation.

[Brief description of the drawings]

FIG. 1 is a block diagram of a main part showing a configuration of a magnetic tape recording apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram of a main part showing a configuration of a conventional magnetic tape recording / recording apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frequency modulation signal input 2 Signal amplification circuit 3 Band pass filter (1) 4 Demodulation circuit (1) 5 Recording amplification circuit (1) 6 Normal sound CH1 fixed head 7 Band pass filter (2) 8 Demodulation circuit (2) 9 Recording Amplifier circuit (2) 10 Normal audio CH2 fixed head 11 Bandpass filter (3) 12 Recording amplifier circuit (3) 13 HiFi audio CH1 rotary head 14 Bandpass filter (4) 15 Recording amplifier circuit (4) 16 HiFi audio CH2 rotation Head 17 Band-pass filter (5) 18 Demodulation circuit (3) 19 Waveform shaping circuit 20 Control circuit 21 Normal audio CH1 input 22 Normal audio CH1 recording / amplifying circuit 23 Normal audio CH1 fixed head 24 Normal audio CH2 input 25 Normal audio CH2 recording / amplification Circuit 26 Normal Voice CH2 fixed head 27 HiFi audio CH1 input 28 HiFi audio CH1 modulation circuit 29 HiFi audio CH2 input 30 HiFi audio CH2 modulation circuit 31 HiFi audio recording amplifier circuit 32 HiFi audio rotary heads

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G11B 5/027 G11B 5/02 373 G11B 20/00-20/02

Claims (2)

(57) [Claims] 1. A signal amplifying circuit for amplifying an external frequency-modulated signal input, a band-pass filter for limiting a general audio carrier frequency band in the amplified signal, and a demodulation circuit for demodulating the band-limited signal. A recording amplifier circuit for amplifying the demodulated signal, a first audio unit including a general audio fixed head for recording the signal amplified by the recording amplifier circuit, and a signal amplifier amplified by the signal amplifier circuit. A band-pass filter for limiting a high-fidelity audio carrier frequency band, a recording amplifier circuit for amplifying the band-limited signal, and a Hi for recording the signal amplified by the recording amplifier circuit
A second audio unit including a Fi audio rotating head, a band-pass filter for limiting a control signal carrier frequency band of a signal amplified by the signal amplification circuit, a demodulation circuit for demodulating the band-limited signal, and the demodulation A magnetic tape recording apparatus, comprising: a waveform shaping circuit for shaping a waveform of a formed signal; and a control circuit for instructing a mode based on the waveform shaped signal. 2. The magnetic tape recording apparatus according to claim 1, wherein the carrier frequency and the apparatus recording speed are n times.