JPH0740323B2 - In-cylinder amplification type recording circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention amplifies a minute recording signal existing outside a rotary cylinder in a rotary cylinder, and amplifies it on a magnetic tape from a head mounted in the rotary cylinder. The present invention relates to an in-cylinder amplification type recording circuit for recording.

Prior Art FIG. 3 shows a block diagram of a conventional recording circuit for recording on a magnetic tape from a head mounted in a rotary cylinder. A conventional recording circuit includes a recording head 30 for recording a signal on a tape, a reproducing head 31 for reproducing a signal recorded on a tape, and a rotary cylinder 32 to which the recording head 30 and the reproducing head 31 are attached. A recording amplifier 33 arranged outside the cylinder 32 for amplifying a minute recording signal for recording on a tape; and an amplified recording signal obtained by the recording amplifier 33 from the outside of the cylinder 32.
And a rotary transformer 34 for transmission to the recording head 30 in FIG.

In the recording circuit configured as described above, the recording amplifier 33
When a minute recording signal is input to, the current or voltage is amplified for recording on the tape. Next, the recording amplifier 33
The recording signal from is transmitted from the outside of the cylinder 32 to the inside by the rotary transformer 34. The recording signal sent into the cylinder 32 is recorded on the tape from the recording head 30.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described conventional configuration, since the rotary transformer 34 is included in the transmission path and the leakage inductance of the rotary transformer 34 enters in series, the required drive voltage increases, and as a result, power consumption is reduced. There was a problem of increase.

Further, when performing the simultaneous reproduction, since the rotary transformer 34 has a recording signal having a large driving voltage and a minute reproducing signal obtained from the reproducing head 31 attached to the cylinder 32, the driving voltage is large. There was also a problem that the leak (crosstalk) from the recording side to the small reproducing side could not be ignored and simultaneous reproduction was extremely difficult.

In addition, the frequency characteristic of the recording circuit is
4. There is also a problem that it is greatly affected by the stray capacitance in the transmission path, the output capacitance of the recording amplifier 33, etc.

The present invention solves the above problem, consumes less power, and can ignore leakage (crosstalk) to the playback side.
An object of the present invention is to provide an in-cylinder amplification type recording circuit with little deterioration in frequency characteristics.

Means for Solving the Problems In order to solve the above problems, the present invention relates to a head for recording a signal on a tape, a rotary cylinder to which the head is attached, and a minute recording signal transmitted to the inside of the cylinder. A rotary transformer, an outside-cylinder buffer amplifier for sending a minute recording signal to the rotary transformer, an in-cylinder buffer amplifier for receiving a minute recording signal from the rotary transformer, and recording on the magnetic tape through the head. A recording amplifier for amplifying a minute recording signal from the in-cylinder buffer amplifier,
A recording signal detector that detects the amplitude value of a minute recording signal obtained by the in-cylinder buffer amplifier to determine the presence or absence of recording, and a recording that turns on / off the operation of the recording amplifier by the output signal of this recording signal detector. A switching device for amplifying a minute recording signal outside the cylinder within the cylinder, and operating the recording amplifier only when there is a minute recording signal to record on the magnetic tape through the head. Is.

Operation With the above configuration, first, the minute recording signal is impedance-converted by the outside-cylinder buffer amplifier and the inside-cylinder buffer amplifier connected to the rotary transformer, and is transmitted from the outside to the inside of the cylinder. Next, the minute recording signal sent to the cylinder is amplified by the recording amplifier in the cylinder. Further, the presence or absence of the minute recording signal obtained by the in-cylinder buffer amplifier is discriminated by the recording signal detector, and the recording switching device is switched according to the presence or absence of the minute recording signal.
As a result, the recording amplifier is turned on and off, and the recording signal amplified by the recording amplifier is recorded on the tape through the head.

As a result, the drive voltage obtained by the recording amplifier becomes the head drive voltage as it is, so that the deterioration of the voltage value due to the transmission path is eliminated, and since a minute recording signal is transmitted to the rotary transformer, it is transmitted to the reproducing system. Leakage is extremely small, and the factor of deterioration of the frequency characteristic is also small because of the output capacitance of the recording amplifier and the stray capacitance in the short line from the recording amplifier to the head.

Embodiments Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a block diagram of an in-cylinder amplification type recording circuit according to an embodiment of the present invention, and FIG. 2 is an operation waveform diagram of the in-cylinder amplification type recording circuit.

As shown in FIG. 1, the in-cylinder amplification type recording circuit includes a head 10 for recording a signal on a magnetic tape 18, and a head 10 for recording the signal.
A rotary cylinder 11 to which 10 is attached, and a rotary transformer 12 for transmitting a minute recording signal into the cylinder 11.
And an external cylinder buffer amplifier 13 for sending a minute recording signal to the rotary transformer 12, an in-cylinder buffer amplifier 14 for receiving a minute recording signal from the rotary transformer 12, and recording on a magnetic tape 18 through a head 10. Recording amplifier 15 for amplifying a minute recording signal from the in-cylinder buffer amplifier 14, and in-cylinder buffer amplifier 14
The recording signal detector 16 that detects the amplitude value of the minute recording signal obtained in step 1 and determines the presence or absence of recording, and the recording switching device 17 that turns the operation of the recording amplifier 15 on and off according to the output signal of the recording signal detector. I have it.

The operation of the in-cylinder amplification type recording circuit configured as described above will be described below with reference to FIG.

First, a minute recording signal outside the cylinder 11 is impedance-converted by an outside-cylinder buffer amplifier 13 and an in-cylinder buffer amplifier 14 connected to the rotary transformer 12, and transmission / reception of transformer transmission is performed. Obtain a minute recording signal. (See FIGS. 2 (a) and 2 (b)) Next, the minute recording signal thus sent is amplified by the recording amplifier 15 so as to be recorded on the magnetic tape 18 from the head 10.

At the same time, the minute recording signal obtained by the in-cylinder buffer amplifier 14 enters the recording signal detector 16, and the recording signal detector 16 determines the presence or absence of the signal and converts it into an H / L signal. (See FIGS. 2 (c) and 2 (d)) The H / L signal is input to the recording switching unit 17, and the operation of the recording amplifier 15 is turned on / off. Therefore, the recording amplifier 15 operates only when a minute recording signal is input, and the head 10
A recording signal is recorded on the magnetic tape 18 through. (See FIG. 2 (e)) As described above, according to this embodiment, the recording amplifier 15 is attached in the vicinity of the head 10.
The drive voltage obtained in step 3 becomes the drive voltage of the head 10 as it is, the deterioration of the voltage value due to the transmission path is eliminated, and low power consumption can be realized.

Further, the factor of the deterioration of the frequency characteristic is reduced because it becomes the output capacitance of the recording amplifier 15 and the stray capacitance in the short line from the recording amplifier 15 to the head 10.

Further, as a result, since a minute recording signal is transmitted to the rotary transformer 12, leakage (crosstalk) into the reproducing system can be ignored.

Furthermore, since the recording amplifier 15 inside the cylinder 11 operates only when a minute recording signal flows, the power consumption inside the cylinder 11 can be further reduced.

As described above, according to the present invention, since the recording amplifier is provided in the vicinity of the head, a recording current equivalent to that of the conventional one in which the recording amplifier is outside the cylinder can be supplied to the head with low power consumption. it can.

Also, since the recording amplifier is inside the cylinder, the deterioration of the recording frequency characteristic occurs only between the recording amplifier and the line with a short head, and the deterioration is less than that in the conventional case where the recording amplifier is outside the cylinder. .

Further, in the rotary transformer, the drive voltage of the recording signal to be transmitted becomes very small, so that the leakage (crosstalk) from the recording system to the reproducing system can be ignored.

Furthermore, the recording signal detector inside the cylinder determines that a minute recording signal is flowing in the rotary transformer, and the recording amplifier inside the cylinder operates only when there is a recording signal. Power consumption can be further reduced, and as a result, there is no need to add a new control signal in order to realize the reduction in power consumption.

[Brief description of drawings]

FIG. 1 is a block diagram of an in-cylinder amplification type recording circuit according to an embodiment of the present invention, FIGS. 2 (a) to 2 (e) are operation waveform diagrams of the same in-cylinder amplification type recording circuit, and FIG. It is a block diagram of the conventional recording circuit. 10 ... Head, 11 ... Cylinder, 12 ... Rotary transformer, 13
… External cylinder buffer amplifier, 14… Internal cylinder buffer amplifier,
15 ... Recording amplifier, 16 ... Recording signal detector, 17 ... Recording switching device.

Claims (1)

[Claims] 1. A head for recording a signal on a tape, a rotary cylinder to which the head is attached, a rotary transformer for transmitting a minute recording signal to the inside of the cylinder, and a minute recording signal for sending to the rotary transformer. An out-cylinder buffer amplifier, an in-cylinder buffer amplifier mounted in the cylinder for receiving a minute recording signal from the rotary transformer, and a minute recording signal from the in-cylinder buffer amplifier for recording on a magnetic tape through the head. A recording amplifier that amplifies, a recording signal detector that detects the amplitude value of a minute recording signal obtained by the in-cylinder buffer amplifier, and determines the presence or absence of recording, and the operation of the recording amplifier by the output signal of this recording signal detector. And a recording switching device for turning on and off a minute recording signal outside the cylinder. In amplifies, constructed the cylinder amplified recording circuit to record on a magnetic tape through only the by operating the recording amplifier head when there is a minute recording signal.