KR910004682Y1 - Melody generative apparatus of vtr - Google Patents

Abstract

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Description

VTR melody generator

1 is a circuit diagram of a preferred embodiment according to the present invention.

* Explanation of symbols for main parts of the drawings

10: VTR 11: Tuner

12: tuner demodulator 13: image playback processing unit

14: image recording processor 15: micom

20, 32: Sync signal separator 21, 33, 42: Low pass filter

22, 34, 35, 43, 44, 52: AND gate 23, 36, 37, 38, 45: OR gate

24, 39: inverter means 31: selection switch means

41: waveform shaper 46: inverter

51: NAND gate 53: delay means

54 switch means 55 melody integrated device

56: buffer 57: speaker

SWI: Tape Cassette Insertion Detection Switch

The present invention relates to a melody generating device of the VTR, and more particularly to a melody generating device of the VTR that can eliminate the monotony when using the melody when the signal-free state or the tape winding operation is continued when using the VTR.

In general, when there is no broadcast of a reception channel in the VTR, or when there is a broadcast, reception of a video signal in which a synchronization signal is broken due to an abnormality of a device or a bad broadcast condition, or when no signal is reproduced, a noise picture or noise is output. Therefore, in the prior art, such a signal state has been made to be muted with this. However, if the mute lasts for a certain time, the user feels very bored due to the monotony until restoring to the normal state.

In addition, in the fast-forward or rewind mode, the tape rewinding operation lasts for a certain time.

On the other hand, if there is no signal state during the recording operation, since the recording operation is continued even in this signal-free state, there is no signal period on the tape, and this signal-free period not only forms a signal-free state during playback, but also wastes the tape. Caused.

Therefore, the object of the present invention is to solve the problems of the prior art as described above can be eliminated the monotony when using by generating a melody when receiving a non-broadcast channel, no signal state playback and fast forward or rewind operation. To provide a melody generating device of the VTR.

In addition, another object of the present invention is to provide a melody generating device of the VTR that can prevent the tape wastage by detecting the signal when recording the non-signal state to generate a melody as an alarm signal to the user.

In order to achieve the above object, the present invention is a VTR for recording and reproducing a video signal on a magnetic tape, and determines whether or not a broadcast signal of a channel tuned in a VTR mode is outputted without a broadcast signal to output a melody generation control signal in a no signal state. The detection unit, the non-signal recording and reproducing detection unit for outputting a melody generation control signal in the non-signal state by determining the presence or absence of a phase signal recorded or reproduced in the recording or reproducing mode, and the presence of a reel rotation pulse in the fast forward or rewind mode. A fast forward and rewind operation detecting unit for outputting a melody generation control signal upon detecting a reel rotation pulse, and a melody generating unit for generating a melody by driving a known melody generating device according to the control signal output of each detection unit. Characterized in that it has been provided.

The melody generating unit may include delay means for driving the melody generating element by delaying a predetermined time by receiving at least one control signal among the control signals of the detection units.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a circuit diagram of a preferred embodiment of the present invention, which is supplied with a synchronous signal separator 20 to output a video signal output through a tuner 11 and a tuner demodulator 12 of a VTR 10 to receive a separated synchronous signal. The DC level is converted through the low pass filter 21, and the change of the DC level is used as a detection signal of presence or absence of the broadcast signal of the tuned channel, and the "low" state of the DC level is detected by no broadcast reception. When the VTR mode is selected, the AND gate 22 and the OR gate 23 gated using the mode selection signal as the gate signal are sequentially passed to output the "low" signal as a melody generation control signal. Equipped.

The AND gate 22 When the mode selection signal is " high " state, that is, when the VTR mode is selected, the signal " low " signal that is the non-broadcast signal is passed. (R3) The " low " signal passing through the AND gate 22 is output by the inverted " low " signal via the inverter means 24 composed of the transistor Q1 and the capacitor C1.

Therefore, the output of the broadcast-free reception detection unit 20 always outputs a "high" or "low" signal depending on the presence or absence of the broadcast mode, when the TV mode is selected, regardless of the broadcast state or not. Done.

The embodiment also converts the video signal input to the video recording processing unit 14 of the VTR 10 and the video signal output from the video reproducing processing unit 13 to the playback control signal (or recording control signal) of the microcomputer 15. The synchronous signal is supplied to the synchronous signal separator 32 through the selection switch means 31 switched accordingly, and the separated synchronous signal is leveled through the low pass filter 33 to detect the presence or absence of the video signal. An AND gate 34 (or AND gate 35) for detecting a " low " state of the DC level as a no signal reproduction (or no signal recording) state and gated by a reproduction control signal (or recording control signal). And an OR signal 36 which outputs the " low " signal as a melody generation control signal via an OR gate 36 and an OR gate 37 which cuts off the signal passage when not in the playback or recording mode. ).

The OR gate 37 logically sums the delayed write control signal D'REC and the delayed reproduction control signal D'PB output from the microcomputer 15 of the VTR 10 through the OR gate 38. This summed output is inverted through an inverter means 39 composed of resistors R4, R5, R6, transistor Q2, and capacitor C2, and the inverted signal is supplied to one input terminal as a gate signal.

Therefore, in the standby mode or the fast rewind mode, in addition to the recording or reproducing mode selection, the output of the no signal recording and reproducing detection unit 30 is a "low" signal. It becomes a "low" signal and this "low" signal is inverted by the in-buffer means 39, becomes a "high" signal, and is supplied to the OR gate 37, so that it is always "high" state with or without an image signal. In the recording or reproducing mode, the "high" or "low" signal is output depending on the presence or absence of the video signal.

The delayed recording and delayed playback control signal is delayed for 2-5 seconds compared to the recording and playback control signal, and becomes " high " so that the output of the OR gate 36 is normally ORed after the input of the recorded video signal or the playback video signal is completed. Output through the gate 37. That is, since the output of the OR gate 36 becomes "low" when the power supply of the VTR 10 is turned on, this "low" signal is supplied as a melody generation control signal regardless of the presence or absence of a recorded or reproduced video signal. Prevent melody from occurring

In the above embodiment, the reel rotation pulse generated by detecting the rotation of the supply reel or the winding reel of the VTR 10 is supplied through the waveform shaper 41, and the waveform of the reel rotation pulse shaped through the low pass filter 42 is obtained. The DC level is changed, and the change of the DC level is used as a reel rotation pulse detection signal, and the "high" state of the DC level is set as a reel rotation pulse detection state. The " high " signal via the AND gate 43 (or AND gate 44), the OR gate 45 and the inverter 46 at the time of the tape cassette insertion signal supplied by the tape cassette insertion detection switching SWI. Fast forward and rewind operation detection unit 40 for outputting the "low" signal inverted as a melody generation control signal.

Therefore, the fast forward and rewind operation detection unit 40 outputs a "low" signal only when the tape cassette is inserted and the reel is rotated in the fast rewind or rewind mode, and always outputs a "high" signal.

In addition, the embodiment outputs a "high" signal when at least one control signal is inputted through the NAND gate 51 of each detection unit, and the "high" signal is a resistor R7 and a capacitor C3. And delayed by a delay means 53 composed of an AND gate 52 and supplied to a switch means 54 composed of resistors R8, R9, transistor Q3, and capacitor C4, and the switch means ( 54 applies a driving power supply voltage (V ⁺ ) to the known melody integrated device 55 by the supplied "high" signal, and the melody integrated device 55 is driven to transmit the melody signal through the buffer 56. A melody generating unit 50 output to the speaker 57 is provided.

The delay means 53 is for preventing the melody from being unnecessarily generated by the melody generation control signal generated due to malfunction.

Therefore, when the outputs of the respective detectors are all “high” signals, the melody generator 50 is supplied with the “low” signal by the NAND gate 51 so that no melody is generated and at least one of the outputs of each detector is “low”. When the " signal outputs " the " high " signal is supplied by the NAND gate 51, a melody is generated.

As described above, in the present invention, when there is no broadcasting or bad broadcasting transmission / reception state during the use of the VTR, or when recording or playing in the no signal state, the detection unit detects it in the fast-forwarding or rewinding operation and generates a melody. I can eliminate it.

In addition, in the no-signal recording operation, a melody is generated to warn the user to cope with the no-signal proxy, thereby preventing unnecessary tape waste.

Claims (2)

In the VTR for recording and reproducing video signals on magnetic tape, the broadcast-free reception detection unit 20 that determines whether or not a broadcast signal is tuned in the VTR mode and outputs a melody sound control signal in a no-signal state, recording or reproducing mode. Determining the presence or absence of a video signal to be recorded or reproduced in the non-signal recording, playback detection unit 30 to output a melody generation control signal in the no signal state, the reel by determining the presence or absence of the reel rotation pulse in the fast-forward or rewind mode The fast-winding and rewinding operation detecting unit 40 outputs a melody generation control signal when detecting a rotating pulse, and the melody generating unit 50 generating a melody by driving a known melody generating element 55 according to the control signal output of each detection unit. VTR melody generating device characterized in that it comprises a). The method of claim 1, wherein the melody generating unit 50 is provided with a delay means 53 for driving the melody generating element 55 by delaying a predetermined time by receiving at least one or more control signals of the control signals of the respective detection units. Melody generator of the VTR.