KR19980067185U - VSI system with recording progress alarm - Google Patents

Abstract

The present invention relates to a VSI system having a recording progress alarm function. In the related art, when recording on a video tape, recording is performed while erasing the previous program contents with the full erase head in the recording mode. If the progress of the recording does not go beyond the system, it is recorded in the non-recorded state, and it was inconvenient because there is no means to easily know the non-recorded state from the outside.

The present invention is connected between the video preamplifier / audio processing units 160 and 122 of the recording system and the video head and the audio head 174 on the drum 2 side so as to improve the above-described problem, so that the recording signal can be improved. The present invention provides a VSI system having a recording progress state alarm function having a recording state alarm unit (1) for detecting a signal and performing an alarm operation.

Description

VSI system with recording progress alarm

The present invention relates to a VSI system having a recording progress alarm function, which is particularly useful when a recording operation does not proceed properly due to an abnormality of an input video signal or a system error to be recorded during the recording process in such a VSI system. This is to alert you.

The VSI system which records the video signal input from the outside or the video signal of the over-the-air broadcast signal received through the internal TV tuner and outputs the video signal recorded on the video tape through the television screen An example is shown as FIG.

Here, the circuit board of the system is composed of the main PCB 100 and the logic PCB 200. The main PCB 100 has a power supply unit 110, an audio recording and reproducing unit 120, a timer sheath servo unit, And a video recording and reproducing unit 140.

In addition, the power supply unit 110 includes a noise filter 111 installed on a power line to remove noise components on an AC input voltage input through the power cord 114, and commercial AC that has passed through the noise filter 111. A switching circuit 112 for generating a high frequency switching voltage to obtain a high quality voltage from an input voltage, and a constant voltage circuit 113 for generating a stable VSI circuit operating voltage in response to the switching voltage output from the switching circuit. Doing.

The audio recording and reproducing unit 120 may include an equalization amplifier 123 for amplifying a voice signal read and input by the voice head 174, and an amplification of an output signal of the equalization amplifier 123 to the A / V jack 180. A line amplifier for transmitting to the voice output terminal 182 and the voice output terminal of the skat jack 190, and receiving and amplifying the audio input signals of the voice input terminal 184 of the A / V jack and the voice input terminal of the scott jack. And a recording amplifier 122 for amplifying the output signal of the line amplifier 121 and outputting the signal to the voice head 174, and for the full-amplification head 176 and the voice muting head 177 to delete the signal. It includes an oscillator 124 for supplying an oscillation signal for.

The timer ciscon servo unit 130 receives the data from the remote control receiver 220 in the logic PCB 200, and sends and receives data through the digitron driver 230, and the timer and The data exchange is performed between the microcomputer 131 which receives the tape control signal by the control head 170 and outputs the control signal to be recorded on the control track of the video tape during tape recording on the control head 170 side. ), And each of the drive servo 133, the capstan servo 134, and the load for driving the drive motor 171, the capstan motor 172, and the loading motor 173 according to the control output of the microcomputer 131. The motor driver 135 is included.

The video recording / reproducing section 140 also includes a signal path comprising an LPF 141, a pre-emphasis circuit 142, and an FM modulator 143 for recording a video signal from the input selector 165, and a BPF (BPF). 145), a first mixer 144 for mixing the signal paths formed by the ACC (Automatic Chroma Level Control) 146 and the converter 147 and the two signals passing through these signal paths to the head amplifier module 160. It includes.

The video recording / reproducing unit 140 also includes a signal processing path of the head amplifier module 160 including a DOC 148, a demodulator 149, and a de-emphasis circuit 150, a converter 152, and a BPF 153. A second mixer 151 for mixing a signal processing path of the head amplifier module, a video signal passing through these two signal paths, and a reproducing amplifier 154 for amplifying a video reproduction signal output from the second mixer. It is included.

The head amplifier module 160 has two or four image rotating heads 175. In the standard recording and reproducing method, the head amplifier module 160 includes two image rotating heads.

A part of the image reproduction signal output from the image recording / reproducing unit 140 is output to the image output terminal 181 of the A / V jack 180, and the other part is modulated by the RF modulator 164 to output the RF output terminal 196. It is configured to output.

The RF signal inputted to the antenna input terminal 195 of the RF modulator 164 is converted into a video and audio signal through the tuner 163 and the IF block 162, so that the first and second switches of the input selector 165 ( 166, 167, and the other end of the first and second switches 166, 167 of the input selector 165, and the video and audio inputs (183, 184) and the skat jack of the A / V jack 180, respectively. A video / audio signal input through the video and audio input terminal of 190 is connected to be applied.

The audio signal and the video signal output from the first and second switches 166 and 167 of the input selector 165 are respectively the LPF 141 in the line amplifier 121 and the video recorder 140 in the audio recorder 120. Are connected to the BPF 145.

Meanwhile, the logic PCB 200 receives a key matrix 240 for inputting a key signal of a function selection key provided on an external front panel of VSI, and receives key input signal data from the key matrix 240. Display various characters and numbers according to the output of the digitron driver 230 and the digitron driver 230 which transmits to the timer 132 of the timer sheath servo unit 130 and receives data from the timer. And a remote control receiver 220 for receiving a control key input signal from the remote control and transmitting the corresponding control data to the timer 132.

In this conventional circuit, the VSI recording system circuit is separately shown and shown as FIG.

Here, a video signal processor 140 connected to the video signal input VI and the audio input AI of the video / audio line and modulating the video signal into a recording system signal, and an audio signal processor 122 for amplifying the audio signal. And a video preamplifier 160 which amplifies and outputs the signal output from the video signal processor 140 to a video head on the drum 2 side, and is connected at a rear end of the video preamplifier 160. A drum (2) having a video head for recording a recorded video signal on a tape, an audio head (174) for recording an audio signal amplified by the audio processor (122), and a microcomputer (12) for system control. It includes.

In the prior art, when video is recorded on the tape through the recording system circuit of FIG. 2, the circuit abnormalities and the input video of the video signal processor 140, the audio signal processor 122, the video preamplifier 160, and the like are recorded. When the recording system signal is not properly generated due to a signal abnormality or the like, a signal recorded by the video head and the audio head 174 on the drum 2 side is either unsigned or sends a normal recording signal. The program recorded on the tape became invalid because the status was not known to external users.

However, in the past, no countermeasures against such invalid recording have been taken, which causes inconvenience in using such a system.

The purpose of the present invention is to detect whether the recording signal of the recording system output side is properly output when the system is operating in the recording mode to improve the problems of the prior art as described above, and to perform the recording abnormal alarm operation when the recording is abnormal. It is possible to take countermeasures.

The present invention is configured to detect a video / audio signal to be recorded and connected to the output side of the video preamplifier and the audio processor of the system so as to realize the object of the above example, and is provided with a recording abnormality alarm unit that performs an alarm operation when the recording signal is abnormal. It is characterized by the VSI system with the recording progress alarm function of.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings, and thus more detailed features of the present invention will be understood.

1 is a system circuit block diagram of a typical VCR (Video Cassette Recorder).

2 is a reference diagram showing an extract of the tape recording system circuit in FIG.

3 is a system circuit block diagram provided with the present invention

4 is a reference diagram illustrating the integrator in FIG. 3 in more detail.

5A is a reference diagram showing a video envelope waveform and the like in a normal recording operation in a video recording system;

Figure 5b is a video envelope waveform when the recording operation is abnormal in the video recording system

Reference diagram showing

** Explanation of symbols on main parts of the drawing **

1. Recording abnormal alarm unit 11. Integrator

12. Micro Computer 13. Alarm Circuit

14. Indicator 15. Buzzer

3 shows a circuit block of a VSI system equipped with a recording abnormality alarm unit according to the present invention.

Here, the recording abnormality alarm unit 1 is connected to the outputs of the video preamplifier unit 160 and the audio processing unit 122 of the system to detect a recorded video / audio signal and to perform an alarm operation when the recording signal error is detected. .

The recording abnormality alarm unit 1 receives a recording signal generated by the video preamplifier unit 160 and the audio processor unit 122 respectively and integrates the recording signal according to the integrator 11 and the active output of the integrator 11. A microcomputer 12 for operating the alarm circuit 13, an alarm circuit 13 that is connected to the output of the microcomputer 12 to perform an alarm operation in the event of recording abnormality, and is connected to the alarm circuit 13 And a buzzer 15 for generating an audible sound and an indicator 14 for displaying an abnormal state.

In addition, the integrator 11 is shown in more detail as shown in FIG. 4.

Here, an integrated circuit 11a that receives an envelope waveform of a video / audio signal and integrates it with a signal comparison circuit 11b that generates a logic output by comparing the output of the integrated circuit 11a with a reference voltage.

The present invention of such a configuration is that when the user inserts a blank tape on the deck of VSI system and presses the record key to record the video program of the external line or broadcasting system line, the system proceeds to the recording operation.

In this state, in the circuit as shown in FIG. 3, the video / audio signal applied through the video / audio signal inputs VI and AI are respectively recorded by the video signal processor 140 and the audio signal processor 122. The video signal processor 140 and the audio signal processor 122 provide a signal to the rear stage while respectively performing a recording signal modulation and signal amplification function for video recording.

The recorder video signal provides a recording signal to the video head on the drum 2 side via the video preamplifier 160 and provides an audio recording signal to the audio head 174 from the output of the audio signal processing unit 122. Will be.

In this case, when an envelope signal respectively output from the preamplifier 160 and the audio signal processor 122 is provided to the integrator 11 of the recording abnormality alarm unit 1, the waveform as shown in FIG. 5A is provided, thereby integrating the integrator 11. Since the output of the integrating circuit 11a of the circuit has a large DC level, the comparison input is larger than the reference level of the comparing circuit 11b, so that the output logic of the comparing circuit 11b is maintained at 1, whereby the microcomputer 12 is in a steady state. It will recognize that a signal is being input.

Therefore, the microcomputer 12 does not drive the alarm circuit 13.

On the other hand, when there is an error in the recording signal due to a circuit error or other factors in the preamplifier 160 and the audio signal processor 122, the waveform as shown in FIG. 5B is provided to the integrator 1 and the integrator 11 is provided. The output of the integrated circuit 11a of the comparison circuit 11b is smaller than the reference level of the comparison circuit 11b because the DC level of the output signal is smaller than that of the recording signal, so that the output logic of the comparison circuit 11b is maintained at 0. 12), the active state signal is inputted to recognize that there is an error in the recording signal.

The microcomputer 12 drives the alarm circuit 13 when an abnormal signal is input to the integrator 11 input port, and the alarm circuit 13 drives the alarm oscillation circuit to ring the buzzer 15. The drive unit of the LED or the digitron display is operated to output the abnormal display to the display unit 14.

Therefore, the user can confirm from the outside that there is an abnormality during recording, and can take appropriate measures.

The present invention allows the external device to check a state in which normal recording cannot be performed due to an external recording signal error or a recorder circuit abnormality when recording a predetermined program on a video tape using VSI. It is possible to take action.

Claims (5)

In the VSI system, the recording system video preamplifier unit 160 and the audio processing unit 122 output side of the system detects the video / audio signals recorded and connected to these outputs, and if the recording signal abnormality recording abnormality alarm unit (1) VSI system with recording progress alarm function characterized by the configuration provided The integrator 11 according to claim 1, wherein the recording abnormality alarm unit 1 receives an integration signal generated by the video preamplifier unit 160 and the audio processor unit 122 and integrates the recording signal generated by the video preamplifier unit 160 and the audio processor unit 122. Microcomputer 12 for operating the alarm circuit 13 according to the active output of the < RTI ID = 0.0 > BC system having a recording progress alarm function, characterized in that consisting of an alarm connected to the (13) to perform an alarm operation The VSI system according to claim 2, wherein the alarm connected to the alarm circuit (13) is a buzzer (15) for generating an audible sound. The VSI system according to claim 2, wherein the alarm is an indicator (14) for displaying an abnormal condition. 2. The integrated circuit of claim 1, wherein the integrator 11 receives an envelope waveform of a video / audio signal and integrates the integrated waveform 11a, and compares the output of the integrated circuit 11a with a reference voltage to generate a logic output. VSI system having a recording progress alarm function, characterized in that the signal comparison circuit 11b