JPH0614293A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To record information data without deteriorating recording picture by converting synchronizing signals separated from a demodulated video signal and information data into a video signal and switching the signal modulated to an information signal for recording by a modulation circuit and the modulation signal before demodulation at the time of recording. CONSTITUTION:A demodulation video signal is demodulated by a demodulation circuit 2 of a magnetic recording and reproducing device 1. The synchronizing signal by a synchronizing separator circuit 3 and information data such as date are supplied. An information signal generation circuit 4 converts the information signal into the video signal, and a modulation circuit 5 converts it into the information signal for recording. The modulation signal and the modulation signal before demodulated by the circuit 2 are switched through a switch 6 at the time of recording. The recording of the information data as well as the video signal whose picture is not deteriorated without performing the modulation and demodulation can be performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus for reproducing a large amount of soft tape or the like.

[0002]

2. Description of the Related Art In recent years, the demand for soft tapes has increased with the spread of household VTRs. In order to duplicate a large amount of soft tape, as shown in FIG. 6, the luminance signal in the reproduced video signal output from the reproducing apparatus 30 for transmission is subjected to luminance signal processing to be an FM signal, and the color signal is a color signal. After being processed and converted into low-pass conversion color signals, these signals are supplied to the recording terminals 40, 50, 60, ... A replication system is in use. Further, in order to control the quality of the finished duplicate tape, data such as the number of the recording terminal and the recording date and time are recorded on the tape for each recording terminal.

A conventional magnetic recording / reproducing apparatus will be described below with reference to the drawings. FIG. 7 shows the recording terminal device 4.
FIG. 1 is a block diagram showing a configuration of a conventional magnetic recording / reproducing apparatus used as 0. In the figure, 30 is a sending device for sending a modulation signal for recording, 41 is a demodulation circuit for demodulating into a video signal, and 42 is a demodulation signal. To 43, a sync separation circuit that separates the sync signal from the output signal, 43 an information signal generation circuit that outputs data such as recording date and time as an information signal, 44 an information signal addition circuit that superimposes the information signal on the demodulated signal, and 45 modulation that performs FM modulation Reference numeral 46 is a recording circuit, and 47 is a video head.

The operation of the magnetic recording / reproducing apparatus configured as described above will be described. The luminance signal output from the sending device 30 is converted into an FM signal by luminance signal processing, and this signal is input to the demodulation circuit 41 and demodulated into a video signal. The demodulated signal demodulated into the video signal is synchronously separated by the synchronous separation circuit 42, and data such as the number of the recording terminal and the recording date and time are input to the information signal generating circuit 43 together with the separated synchronous signal, and the recorded data is recorded. Converted to video signal form. Then, the output of the demodulation circuit 41, the output of the sync separation circuit 42, and the output of the information signal generation circuit 43 are input to the information signal addition circuit 44, and the recording data is superimposed on the video signal. Further, the video signal on which the recording data is superimposed is FM-modulated by the modulation circuit 45, band-limited and amplified by the recording circuit 46, and recorded on the magnetic tape by the video head 47.

[0005]

As described above, in the recent tape duplication system, the reproduction video signal output from the sending device 30 is converted into the FM signal and the low-frequency conversion color signal, and then the distributor 31 is used. Multiple recording terminals 40, 5
Each signal is supplied to 0, 60, ... And a large amount of duplication is performed.
This is because the purpose is to reduce the cost of the recording terminal by reducing the circuit of the recording terminal having a large number of units, and to reduce the price of the entire duplication system.

However, in order to record the information such as the terminal number and the recording date and time for each recording terminal, the FM-modulated signal had to be demodulated and re-modulated again. As described above, since the image is recorded after being demodulated again after demodulation, it is necessary to perform high-quality demodulation / modulation in order to suppress the deterioration of the recording image quality, which causes a problem of high cost. . In addition, after all, there has been a problem that the deterioration of the recording image quality cannot be avoided.

Therefore, an object of the present invention is to provide a magnetic recording / reproducing apparatus capable of preventing deterioration of recording image quality and recording information signals without performing high-quality demodulation / modulation.

[0008]

A magnetic recording / reproducing apparatus of the present invention comprises a demodulation circuit for demodulating a modulated input signal into a video signal, and a sync separation circuit for separating a sync signal from the video signal demodulated by the demodulation circuit. An information signal generation circuit for converting the information data into a video signal by inputting the synchronization signal output from the synchronization separation circuit and the information data indicating the recording date and time, and the output signal output from the information signal generation circuit is the recording information signal. And a switching circuit for switching between the recording information signal output from the modulation circuit and the modulation input signal that has not been demodulated by the demodulation circuit and outputting to the recording circuit.

[0009]

According to the structure of the present invention, after the sync signal is separated from the video signal demodulated by the demodulation circuit by the sync separation circuit, the sync signal and the information data are converted into the video signal by the information signal generating circuit, It is modulated as a recording information signal by the modulation circuit. If the recording information signal is output to the recording circuit while switching the switching information circuit with respect to the modulated input signal that has not been demodulated, the recording input signal can be recorded without demodulating and modulating again, so the recording image quality deteriorates. It is also possible to record the information data indicating the recording date and time and the like.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a magnetic recording / reproducing apparatus 1 according to an embodiment of the present invention. In FIG. 1, 30 is a sending apparatus for sending a modulated signal for recording, and 2 is a sending apparatus 30. A demodulation circuit that demodulates the output FM signal into a video signal, 3 a synchronization separation circuit that separates a synchronization signal from the demodulation signal, 4 an information signal generation circuit that outputs data such as recording date and time as a recording information signal, and 5 A modulation circuit for modulating the recording information signal, 6 is a switch circuit for switching between the non-demodulated recording modulation signal and the modulated recording information signal, 7 is a recording circuit, and 8 is a video head.

Signal processing in the magnetic recording / reproducing apparatus 1 configured as described above will be described with reference to the waveform diagram of FIG. The luminance signal output from the transmitting device 30 is subjected to luminance signal processing and modulated into an FM signal (FIG. 2).
(A)). This signal is input to the demodulation circuit 2 and demodulated into a video signal. The demodulated signal is sync separated by the sync separation circuit 3. The separated sync signal and the information data indicating the number of the recording terminal, the recording date and time, etc. are input to the information signal generating circuit 4, the information signal generating circuit 4 converts the data into a video signal, and then the modulation circuit 5 records the data. It is modulated into an FM signal as a use information signal (FIG. 2 (b)). Then, the modulated signal output from the sending device 30 and not demodulated and the recording information signal output from the modulation circuit 5 are output to the recording circuit 7 while being switched by the switch circuit 6.

The recording circuit 7 limits the bandwidth of these signals,
Processing such as amplification is performed and recording is performed by a video head 8 on a magnetic tape (not shown). By processing in this way, as shown in FIG. 2C, it is possible to obtain a modulated signal in the same form as in the case where the original signal to be recorded and the signal indicating information are superimposed and then modulated. The switching timing by the switch circuit 6 is shown in FIG. 6A shows a signal when the modulation signal on the A side of the switch circuit 6 is demodulated to show the timing, and FIG. 7B shows a signal when the modulation signal on the B side of the switch circuit 6 is demodulated to show the timing. 6C shows a signal in the case where the output signal of the switch circuit 6 is demodulated to show the timing.
(D) is a diagram showing a switching timing of the switch circuit 6. Set the switch circuit 6 to B at the timing shown in (d).
And the information data is added to the modulation signal between scanning line numbers 11 to 16 as shown in FIG. Figure 4
Shows a modulated signal, and FIG.
Side modulation signal, (b) shows the B side modulation signal of the switch circuit 6, and (c) shows the modulation signal output from the switch circuit 6 and recorded by the recording circuit 7. FIG. 5 shows an example in which the information signal and the image signal recorded as described above are reproduced on the monitor.

In the apparatus according to the embodiment of the present invention, as described above, the modulated signal input for recording is demodulated / reproduced.
Since the information can be recorded as it is without being subjected to the modulation process and the recording information data can be recorded in the form of being superimposed on the modulation signal, the information signal can also be recorded together without causing deterioration of the recording image quality. Further, since high-quality demodulation / modulation processing is not required to prevent image quality deterioration, the circuit configuration can be inexpensive.

[0014]

According to the magnetic recording / reproducing apparatus of the present invention,
A recording image can be recorded together with information data such as recording date and time without deteriorating the recording image quality, and the circuit configuration can be made inexpensive.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a magnetic recording / reproducing apparatus that is an embodiment of the present invention.

FIG. 2 is a waveform diagram for explaining signal processing in the apparatus of the embodiment.

FIG. 3 is a diagram showing an example of switching timing in a switch circuit.

FIG. 4 is a diagram showing a modulation signal in a switch circuit.

FIG. 5 is a diagram showing an example in which information data is superimposed and reproduced on a monitor.

FIG. 6 is a block diagram showing a configuration of a duplication system.

FIG. 7 is a block diagram showing a configuration of a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

 1 Magnetic Machine Lock Playback Device 2 Demodulation Circuit 3 Sync Separation Circuit 4 Information Signal Generation Circuit 5 Modulation Circuit 6 Switch Circuit 7 Recording Circuit 8 Video Head

Claims (1)

[Claims] 1. A magnetic recording / reproducing apparatus for recording a modulated input signal modulated for recording on a magnetic tape, the demodulation circuit demodulating the modulated input signal into a video signal, and a video demodulated by the demodulation circuit. A sync separation circuit that separates a sync signal from a signal; an information signal generation circuit that receives the sync signal output from the sync separation circuit and information data indicating recording date and time and converts the information data into a video signal; A modulation circuit that modulates an output signal output from a signal generation circuit into a recording information signal, and a recording information signal output from the modulation circuit and the modulation input signal that is not demodulated by the demodulation circuit are switched and recorded. A magnetic recording / reproducing apparatus having a switch circuit for outputting to a circuit.