JP3208912B2 - Recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus suitable for application to a recording apparatus such as a VTR for recording video and audio on a recording medium such as a magnetic tape through a rotary transformer.

[0002]

2. Description of the Related Art Conventionally, for example, when video and audio are recorded on a recording medium such as a magnetic tape using a rotary head device,
A rotary transformer is used to supply a recording signal to the rotated rotary head device.

As a configuration for supplying a recording signal to a rotary head device using this rotary transformer, the present applicant has previously proposed a circuit shown in FIG. This circuit is configured as a helical scan type tape recorder. In FIG. 9, reference numeral 1 denotes a recording system circuit of the tape recorder. A recording signal output from the recording system circuit 1 is transmitted through a rotary transformer 2. It is supplied to the waveform shaping circuit 3. The waveform shaping circuit 3 detects a rising edge and a falling edge of a signal that has become a differentiated waveform under the influence of the low-frequency cutoff of the rotary transformer 2 and performs positive feedback at the same time to maintain high and low levels. Restore the signal.

The original signal restored by the waveform shaping circuit 3 is supplied to a magnetic head 4 and recorded by the magnetic head 4 on a magnetic tape 5 so as to form an inclined track. In this case, from the rotary transformer 2 to the magnetic head 4
Up to the rotary side (that is, in the rotary head device).

FIG. 10 shows a signal state in such a configuration. An original signal output from the recording system circuit 1 (FIG. 10A)
Becomes a differential waveform corresponding to the rise and fall of the original signal as shown in FIG. 10B due to the influence of the low-frequency cutoff when passing through the rotary transformer 2. Since positive feedback is applied at the same time as detecting the rising edge and the falling edge, FIG.
As shown in FIG. 10C, the same signal as the original signal shown in FIG. 10A can be restored.

[0006]

When the recording signal is transmitted via the rotary transformer as described above, only the high-frequency component of the transmitted recording signal is transmitted to the other party, and the low-frequency component is transmitted. There was a wasteful inconvenience.
For example, in the example of FIG. 10, the low-frequency components (the components other than the vicinity of the rising edge and the vicinity of the falling edge) of the original signal illustrated in FIG. 10A are not transmitted.

For this reason, on the recording system circuit 1 side, of the power used for generating the recording signal, the power used for generating the low-frequency component is wastefully consumed. There was a disadvantage that the efficiency of the recording circuit was poor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a recording apparatus capable of performing an efficient recording process with a small amount of power.

[0009]

According to the present invention, there is provided a signal processing means for processing an information signal to be recorded, and a high frequency component extracting means for extracting a high frequency component from a recording signal output from the signal processing means. A rotary transformer 2 for transmitting the output of the high-frequency component extracting means 6 to the head side; a waveform shaping means 3 for differentiating the output from the rotary transformer 2 to shape the waveform; Recording means 4 for recording the output on a recording medium 5.

Further, in the present invention, the high-frequency component extracting means 6 includes rising and falling detecting means 61 to 64 of the information signal supplied from the signal processing means.
The rising and falling detecting means 61 to 64 include:
A clock synchronized with the information signal is supplied, and rising detection information or falling detection information in which the signal state changes only for one period of the clock is obtained, and the detected rising information and falling information are supplied to the rotary transformer. It is something to do.

In the present invention, the high frequency component extracting means 6 includes rising and falling detecting means 61 to 64 of the information signal supplied from the signal processing means.
The rising and falling detecting means 61 to 64 include:
A clock synchronized with the information signal and an inverted signal of the clock (the output of the inverter gate 65) are supplied to obtain rising detection information or falling detection information in which the signal state changes only for a half cycle of the clock, The detected rising information and falling information are supplied to a rotary transformer.

Further, according to the present invention, the capacitors C1 and C2 are used as the high-frequency component extracting means 6 in the above description.

[0013]

According to the present invention described above, only the high frequency component of the information signal is supplied to the rotary transformer 2,
No loss occurs when the low-frequency component is supplied to the rotary transformer.

Further, according to the structure of the present invention described above,
Since the rising detection information or the falling detection information in which the signal state changes only for one period of the clock is obtained based on the clock synchronized with the information signal to be recorded, the high band where the pulse rises only for one period of the clock is obtained. A signal of only the component is obtained, and this high-frequency signal is transmitted via the rotary transformer.

Further, according to the configuration of the present invention described above,
Based on the clock synchronized with the information signal to be recorded, rising detection information or falling detection information in which the signal state changes only for a half cycle of the clock is obtained, so that the pulse rises only for a half cycle of the clock. Is obtained, and this high-frequency signal is transmitted via a rotary transformer.

Further, according to the configuration of the present invention described above,
Since the high frequency component is detected by the capacitor, a signal of the high frequency component based on the charge / discharge characteristics of the capacitor is obtained, and the high frequency signal is transmitted through the rotary transformer.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the recording apparatus of the present invention will be described below in detail with reference to FIGS. FIGS. 1 to 8
In FIG. 9, the same reference numerals are given to the portions corresponding to those in FIG. 9, and the detailed description thereof will be omitted.

In this embodiment, the tape recorder is configured as a helical scan type tape recorder for recording digital data. FIG. 1 shows a basic configuration. In FIG. 1, reference numeral 1 denotes a recording system circuit of the tape recorder. A recording signal (digital data) output from the recording system circuit 1 is supplied to a high-frequency component extraction circuit 6. The high-frequency component extraction circuit 6 extracts only the high-frequency component of the supplied recording signal. The high-frequency signal extracted and output by the high-frequency component extraction circuit 6 is converted into a waveform via the rotary transformer 2. It is supplied to the shaping circuit 3. The waveform shaping circuit 3 differentiates the high-frequency signal transmitted from the high-frequency component extraction circuit 6 to detect the rising and falling edges of the signal and at the same time to apply positive feedback to the detected levels (high level and low level). Level) is maintained, and the original signal output from the recording system circuit 1 is restored.

Then, the original signal restored by the waveform shaping circuit 3 is supplied to the magnetic head 4, and the magnetic head 4 records the magnetic tape 5 so as to form an inclined track. The other parts are configured in the same manner as the conventional recording apparatus shown in FIG.

Referring to FIG. 2, the operation of the circuit of the present embodiment will be described. The original signal (FIG. 2A) output from the recording system circuit 1 is supplied to the high-frequency component extraction circuit 6. As a result, only the high frequency components (FIG. 2B) included in the rising and falling portions of the original signal are extracted. Since the rotary transformer 2 can pass the high frequency component, the signal supplied to the waveform shaping circuit 3 via the rotary transformer 2 (FIG. 2C) is the same as the output of the high frequency component extraction circuit 6. . Then, the waveform shaping circuit 3 detects the rising edge and the falling edge of the high-frequency component waveform, and performs positive feedback at the same time.
As shown in FIG. 2, the same signal as the original signal shown in FIG. 2A can be restored.

Next, a specific example 1 of the recording apparatus shown in FIG. 1 will be described with reference to FIG.

In FIG. 3, reference numeral 11 denotes an input terminal to which a recording signal converted into digital data processed by a recording system circuit is supplied, and the recording signal obtained at the input terminal 11 is supplied to a D input of a D flip-flop 12. To supply. The D flip-flop 12 includes a clock generation circuit 13
And a recording data detected in synchronization with the clock is obtained at an output terminal Q. In this case, the clock output from the clock generation circuit 13 is the same as the clock used for the recording data processing.

The data obtained at the output terminal Q of the D flip-flop 12 is supplied to the D input of a D flip-flop 61 constituting the high frequency component extraction circuit 6. This D
The clock from the clock generation circuit 13 is also supplied to the flip-flop 61, and data detected in synchronization with the clock is obtained at the output terminal Q, and data inverted from the output data is output to another output terminal Q (inverted). Get in).

The data obtained at the output terminal Q of the D flip-flop 61 is transferred to the next-stage D flip-flop 6.
2 D input. The clock from the clock generation circuit 13 is also supplied to the D flip-flop 62.

The data obtained at the output terminal Q of the D flip-flop 61 and the data obtained at the output terminal Q (inverted) of the D flip-flop 62 are supplied to an AND gate 63. Get the logical product of the data. Also, the output terminal Q of the D flip-flop 61
(Inverted) data and D flip-flop 62
And the data obtained at the output terminal Q of the AND gate 64
The AND gate 64 obtains the logical product of both data.

The output sections of the AND gates 63 and 64 are connected to one end and the other end on the primary side (fixed side) of the rotary transformer 2 to supply the rotary transformer 2 with recording data. And this rotary transformer 2
The secondary side (rotating side) is connected to the waveform shaping circuit 3, and the output of the waveform shaping circuit 3 is supplied to the magnetic head 4 via the head driver 7.

Next, the operation of the circuit shown in FIG. 3 will be described. First, it is assumed that the clock shown in FIG. 4A is output from the clock generation circuit 13 and the pulse shown in FIG. 4B is obtained as input data (recording data) output from the D flip-flop 12. At this time, the rising edge of the input data is detected from the output (FIG. 4C) of the AND gate 63, and A
The falling of the input data is detected from the output of the ND gate 64 (FIG. 4D). Here, in the present example, the clocks of the same phase are supplied to the D flip-flops 61 and 62 for latching the input data.
The rising detection pulse and the falling detection pulse detected at 3 and 64 are pulses that are at high level only during one cycle period τ of the clock.

The outputs of the AND gates 63 and 64 are supplied to the primary side of the rotary transformer 2 so that the waveform shown in FIG. 4E is obtained on the secondary side of the rotary transformer 2. The signal is supplied to the waveform shaping circuit 3. The waveform shaping circuit 3 performs waveform shaping by differential detection, thereby obtaining data having the same waveform as the input data shown in FIG. 4F. This data is recorded on the magnetic tape 5 by the magnetic head 4.

As described above, in this example, since the data supplied to the rotary transformer 2 is only the rising detection pulse and the falling detection pulse of the input data, the energization time of the rotary transformer 2 is greatly reduced. The power consumption for transmitting the recording data to the secondary side of the rotary transformer can be reduced as compared with the related art.

Next, a specific example 2 of the recording apparatus shown in FIG. 1 will be described with reference to FIG.

In this embodiment, similarly to the first embodiment, the recording data obtained at the input terminal 11 is converted into data synchronized with the clock by the D flip-flop 12, and this data is ANDed with the D flip-flops 61 and 62. Gate 63,
64, the clock output from the clock generation circuit 13 is inverted by an inverter gate 65 as a clock supplied to the D flip-flop 62 in this example. It is intended to supply things. The other parts are configured in the same manner as in the specific example 1 described above.

The operation of the circuit shown in FIG. 5 will be described. It is assumed that the clock shown in FIG. 6A is output from the clock generation circuit 13 and the inverted gate shown in FIG. At this time, if a pulse shown in FIG. 6C is obtained as input data (recording data) output from the D flip-flop 12, A
The rising detection pulse (FIG. 6D) as the output of the ND gate 63 and the falling detection pulse (FIG. 6E) as the output of the AND gate 64 are each one clock.
The pulse becomes a high level only during a period τ / 2 of of the cycle. Therefore, as shown in FIG. 6F, the waveform supplied to the secondary side of the rotary transformer 2 has a period during which the pulse changes is １ ／ of that in the first example. Then, this waveform is subjected to waveform shaping by differential detection in the waveform shaping circuit 3 to obtain data having the same waveform as the input data shown in FIG. 6G, and this data is recorded on the magnetic tape 5 by the magnetic head 4.

As described above, in this example, the period during which the rising detection pulse or the falling detection pulse of the data supplied to the rotary transformer 2 changes is the specific example 1.
場合, and the rotary transformer 2
, The power consumption time for transmitting the recording data to the secondary side of the rotary transformer can be further reduced.

Next, a specific example 2 of the recording apparatus shown in FIG. 1 will be described with reference to FIG.

In this embodiment, the high-frequency component extraction circuit 6 is composed of an operational amplifier 66 and capacitors C1 and C2. The recording data processed by the recording system circuit 1 is supplied to the operational amplifier 66, The feedback data and the negative feedback data are obtained, and the respective data are stored in the capacitors C1 and C1.
Feed to 2. Then, high-frequency components are extracted by the capacitors C1 and C2 based on the charge / discharge characteristics of the capacitors, and the capacitors C1 and C2 are extracted.
The data of the high frequency component obtained in
Is supplied to one end and the other end of the primary side. The data obtained on the secondary side of the rotary transformer 2 is supplied to a waveform shaping circuit 3 for performing waveform shaping by differential detection.
The shaped waveform is supplied to the magnetic head 4 for recording.

The operation of the circuit shown in FIG. 7 will be described. When the data shown in FIG. 8A is obtained as the recording data output from the recording system circuit 1, only the rising and falling portions of the recording data are shown in FIG. 8B. Thus, the waveforms output from the capacitors C1 and C2 and transmitted from the secondary side of the rotary transformer 2 to the waveform shaping circuit 3 also have the same high-frequency component as shown in FIG. 8C. Then, the same waveform as the original recording data shown in FIG. 8D is restored by waveform shaping by differentiating the waveform of only the rising portion and the falling portion, and this recording data is recorded on the magnetic tape 5 by the magnetic head 4. Is done.

In the case of the configuration shown in FIG. 7, high-frequency components are extracted by analog processing based on the charge / discharge characteristics of the capacitor. However, similar to the other examples described above,
Only the high-frequency component is transmitted through the rotary transformer 2, and the energization time of the rotary transformer 2 is reduced.
The power consumption for transmitting the recording data to the secondary side of the rotary transformer can be reduced.

The above embodiment is an example of the present invention.
It goes without saying that various other configurations can be adopted without departing from the spirit of the present invention.

[0039]

According to the present invention described above, only the high-frequency component of the information signal is supplied to the rotary transformer, and no loss occurs when the low-frequency component is supplied to the rotary transformer. The recording signal can be efficiently transmitted through the recording medium, and the power consumption for the recording process can be reduced accordingly.

Further, according to the present invention, rising detection information or falling detection information in which the signal state changes only for one period of the clock is obtained based on the clock synchronized with the information signal to be recorded. A signal consisting of only high-frequency components in which a pulse rises for one period is obtained, and a signal consisting only of high-frequency components to be transmitted via a rotary transformer is efficiently created.

Further, according to the present invention, the rising detection information or the falling detection information in which the signal state changes for a half period of the clock is obtained based on the clock synchronized with the information signal to be recorded. A signal of only a high-frequency component in which a pulse rises during a half cycle of the clock is obtained, and a signal of only a high-frequency component to be transmitted via a rotary transformer is created more efficiently.

Further, according to the present invention, since the high frequency component is detected by the capacitor, a signal of the high frequency component based on the charge / discharge characteristics of the capacitor can be obtained, and the high frequency component can be detected by an analog circuit. You can easily extract only.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of an embodiment of the recording apparatus of the present invention.

FIG. 2 is a waveform diagram for explaining an embodiment of the recording apparatus of the present invention.

FIG. 3 is a configuration diagram showing a specific example 1 of the recording apparatus of the present invention.

FIG. 4 is a timing chart for explaining a specific example 1 of the recording apparatus of the present invention.

FIG. 5 is a configuration diagram showing a specific example 2 of the recording apparatus of the present invention.

FIG. 6 is a timing chart for explaining a specific example 2 of the recording apparatus of the present invention.

FIG. 7 is a configuration diagram showing a specific example 3 of the recording apparatus of the present invention.

FIG. 8 is a waveform chart for explaining a specific example 3 of the recording apparatus of the present invention.

FIG. 9 is a block diagram illustrating an example of a conventional recording apparatus.

FIG. 10 is a waveform chart for explaining a conventional recording apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Recording system circuit 2 Rotary transformer 3 Waveform shaping circuit 4 Magnetic head 6 High frequency component extraction circuit 7 Head driver 12, 61, 62 D flip-flop 63, 64 AND gate 65 Inverter gate 66 Operational amplifier

Claims (4)

(57) [Claims] 1. A signal processing means for processing an information signal to be recorded, a high frequency component extracting means for extracting a high frequency component from a recording signal output by the signal processing means, and an output of the high frequency component extracting means A rotary transformer for transmitting to the head side; a waveform shaping means for performing waveform differentiation by differentiating an output from the rotary transformer; and a recording means for recording an output from the waveform shaping means on a recording medium. Recording device. 2. A rising and falling detecting means of an information signal supplied from the signal processing means is provided as the high frequency component extracting means, and a clock synchronized with the information signal is provided to the rising and falling detecting means. And supplying rising detection information or falling detection information in which the signal state changes only for one period of the clock, and supplying the detected rising information and falling information to the rotary transformer. 2. The recording device according to 1. 3. A rising and falling detecting means of an information signal supplied from the signal processing means is provided as the high frequency component extracting means. The rising and falling detecting means includes a clock and a clock synchronized with the information signal. An inverted signal of this clock is supplied to obtain rising detection information or falling detection information in which the signal state changes only for a half cycle of the clock, and the detected rising information and falling information are converted to the rotary transformer. 2. The recording apparatus according to claim 1, wherein said recording apparatus is supplied to said recording apparatus. 4. The recording apparatus according to claim 1, wherein a capacitor is used as said high frequency component extracting means.