KR900000494Y1 - Automatic index operating circuit of video tape recorder - Google Patents

Abstract

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Description

Automatic index function circuit of video recorder

1 is a block diagram according to the present invention.

2 is a detailed circuit diagram of FIG. 1 according to the present invention.

* Explanation of symbols for main parts of the drawings

10: index signal generation circuit 20: audio signal amplification circuit

30: reproduction index signal generation circuit 40: microcomputer unit

50: playback signal output and playback index detection circuit

60: playback index signal confirmation circuit

The present invention relates to a circuit for finding a program of a video recording and reproducing apparatus, and more particularly to a circuit capable of automatically finding and reproducing a program by an index signal of a video recording and reproducing by pressing an index key.

In general, to select a desired program after recording in the video recorder, there are Play mode, Standard mode, etc., so that it can record much longer than the standard recording time of video tape.

Therefore, there is an inconvenience that the user has to find a desired program for a long time when playing and recording a videotape.

In addition, since the user manually selects a desired program, the user does not find the starting point of the desired program, and there is an inconvenience of repeating the P / S mode several times.

Accordingly, an object of the present invention is to provide an automatic index function circuit of an image reproducing recorder that enables a user to easily find a desired program by inputting an index signal having a predetermined frequency into an audio head in a recording mode and generating a reproducing index signal in a reproducing mode. In providing.

In order to accomplish the object of the present invention, when the index key is pressed in the recording mode, an index signal generation circuit for interrupting an audio signal and switching a predetermined frequency (hereinafter referred to as FH) to generate an index signal, and amplifying and recording the index signal An audio signal amplifying circuit that amplifies and adjusts the level, applies a high frequency bias, and outputs it to the audio head, and a playback index signal in which a user presses an index key to generate a predetermined index signal during playback (hereinafter referred to as PB). A generation circuit, a microcomputer unit for generating a P / S mode and recognizing an index signal, and converting to a play mode to control the system; and filtering and amplifying the index mode in the audio head, Playback index signal detection and playback signal output circuit and filtered index for amplifying and outputting Comparing the number to be output, characterized in that a reproduction index signal check circuit for releasing the microcomputer unit P / S conversion mode and the play mode.

Hereinafter, with reference to the accompanying drawings of the present invention, FIG. 1 is a block diagram according to the present invention, the index signal generation circuit 10 for generating an index signal by the user pressing the index key in the recording mode, and the index signal An audio signal amplifying circuit 20 for amplifying the input signal to the audio head, a reproducing index signal generating circuit 30 for generating a reproducing index signal by pressing an index key to select a desired program in the PB mode, and a reproducing index A microcomputer 40 for maintaining the specified P / S mode and play mode according to the presence or absence of a signal, and a reproduction signal output for filtering and amplifying a reproduction index signal in the P / S mode, and outputting a reproduction audio signal in the play mode; The playback index detection circuit 50 and the playback index signal are compared and output to convert the P / S mode of the microcomputer unit 40 into the play mode, and then the playback index signal. And a reproduction index signal confirmation circuit 60 for outputting a mute signal for removing high frequency noise of the reproduction index signal to the reproduction signal output and index detection circuit 50 at the time of pickup.

When the user wants to record an arbitrary program, pressing the index key prohibits the audio signal from being stored in the audio track, and switches the predetermined frequency during the time that the index key is pressed to output a predetermined frequency. The output is input to the audio signal amplifying circuit 20.

The audio signal amplifying circuit 20 that inputs the signal is amplified by adjusting the recording level and then input to the audio head together with the high frequency bias signal.

In order to select a desired program in the PB mode, the user must press an index key to operate the P / S index signal generation circuit 30.

When the PB index signal is generated, the microcomputer 40 recognizes the signal and converts the signal to the P / S mode, and the audio head continuously outputs the audio signal to the playback signal and the playback index detection circuit 50.

In the circuit 50, the audio head continues to output the audio signal in the P / S mode, but if the desired index signal FH is recognized, the audio head is filtered to input the index signal to the reproduction index signal checking circuit 60 after amplification.

When the index signal is input to the circuit 60, it is output through the comparison circuit and input to the microcomputer 40, converts from the P / S mode to the play mode, and mutes the components of the high frequency index signal during the comparison detection. The signal is output by eliminating the generation of high frequency noise.

FIG. 2 is a concrete circuit diagram of FIG. 1 when the AND gate G _{1 for} ANDing the recording mode and the index key mode and the line amplifier A ₁ and AND G ₁ for amplifying the input audio signal are high. A portion composed of a switch SW ₁ for switching an index signal corresponds to the index signal generating circuit 10, and a variable resistor VR ₁ for adjusting the generated signal to a recording level and an amplifier A for amplifying the recording signal. ₂ ) and a portion composed of a variable resistor VR ₂ and a capacitor C _{1 for} connecting a high frequency bias to the amplified signal correspond to the audio signal amplifying circuit 20, and logically multiply the reproduction mode and the index key mode. Part consisting of a capacitor (C ₃ ), a resistor (R ₆ ) and a diode (D ₂ ) for connecting to the P / S mode of the controller when the output signal of the AND gate (G ₂ ) and the in gate (G ₂ ) is high. Corresponds to the reproduction index signal generation circuit 30, The control unit for controlling the system by switching to the P / S mode and the play mode corresponds to the microcomputer unit 40, and an amplifier A ₃ for preamplifying the audio signal output from the audio head and the reproduction index signal in the P / S mode. A band pass filter (BPF) for filtering the signal, an amplifier (A ₆ ) for amplifying a reproduction index signal, an amplifier (A ₄ ) for amplifying a voice signal in a play mode, and a buffer (A ₅ ) for amplifying the amplified signal. The microcomputer unit 40 corresponds to the reproduction signal output and the reproduction index signal detection circuit 50, and outputs a comparator COM _{1 for} comparing the signals of the resistors R ₁ and R ₂ with the signals of the circuit 50 together. Capacitor (C ₂ ), clause (R ₅ ), diode (D ₁ ), and also the resistor (R ₃ , R ₄₎ connecting the output of the comparator (COM ₁ ) to the P / S mode of the microcomputer section. ), The portion composed of the transistor TR ₁ corresponds to the reproduction index signal confirmation circuit 60.

Therefore, in detail with reference to the accompanying drawings an embodiment of the present invention, when the user tries to record any program, the first start of the video tape is performed only in the recording mode.

Once one program has been recorded, when recording another program, the user presses the index keys together in the recording mode.

The signal causes the output of the AND gate G _{1 to} become high, and the switch SW ₁ is connected to the FH to stop the input of the audio signal and output the FH.

FH is output while the index key is pressed. When the index key is released, the FH output is stopped and the audio signal is input again to start recording.

The output is adjusted by the variable resistor VR ₁ according to the recording level, and stored in the voice head together with the high frequency bias signal through the variable resistor VR ₂ and the capacitor C ₁ through the recording amplifier A ₂ . do.

Therefore, during the recording, the FH prohibits the input of the audio signal to the voice head through the recording line, stores the index signal in the voice head, and ends the input of the index signal. Is entered.

In order to find a desired program, when the index key is pressed in the PB mode, a PB index signal is generated and the output of the AND gate G ₂ becomes high.

The signal is recognized by the microcomputer 40 through the dog capacitor C ₃ and the resistor R ₆ , which are differentiators, and converted to the P / S mode, thereby indicating that the PB index signal is generated.

When the microcomputer 40 switches to the P / S mode, the audio head continuously outputs a voice signal.

The band pass filter BPF filters the index signal FH in the audio head output, amplifies the index signal through the amplifier A ₆ , inputs the non-inverting terminal of the comparator COM ₁ , and inputs the signal to the resistor R. ₁ , R ₂ ) is set larger than the input of the inverting terminal inputted by the partial pressure, and the comparison is selected.

The output is turned on by the voltage divider of the resistors R ₃ and R ₄ to turn on the transistor TR ₁ to bring the P / S mode low, and is input to the microcomputer 40 through the capacitor C ₂ to supply the P / S. Automatically switch the mode to play mode.

At the same time, when the FH is filtered and selected by the comparator COM ₁ , a mute signal is applied to the buffer A ₅ to remove the high frequency noise of the FH.

If there is no FH signal while the audio head is outputting the signal, the band pass filter (BPF) cannot select the index signal, so the comparator (COM ₁ ) output is input to the inverting terminal by the partial pressure of the resistors (R ₁ , R ₂ ). By selecting the low signal, the transistor TR ₁ cannot be driven.

Since the state remains in the P / S mode by the differentiating pulse of the resistor R ₆ capacitor C ₃ , the audio signal is output until the FH signal is output from the audio head.

When the microcomputer 40 enters the play mode, the audio head outputs the selected PB signal to the amplifier A ₄ through the preamplifier A ₃ , and the signal is output through the buffer A ₅ so that the signal is output. Is output.

As described above, in the present invention, the user indexes the index signal FH using the audio track in the video tape.

When the user wants to select a desired program in the playback mode, the index key is pressed to switch to the P / S mode, and the playback index signal is filtered out of the audio signal output from the audio head and is recognized by the microcomputer unit 40. It automatically switches from mode to play mode so you can find the program you want.

Therefore, the user can easily find a program that he wants to watch among the programs recorded on the videotape.

Claims (1)

In the program selection circuit of a video recording recorder tape, an index signal generating circuit (10) which cuts out a recording signal by pressing an index key in the recording mode, switches a predetermined frequency, and adjusts the indes signal to a recording level. An audio signal amplifying circuit 20 for amplifying and outputting a high frequency bias signal to a voice head, a regenerating index signal generating circuit 30 for informing a controller of generation of a regenerating index signal by pressing an index key in a reproducing mode; The microcomputer unit 40 selects the P / S mode by the play index signal and recognizes the play index signal and converts the play index signal to the play mode, and inputs a signal from the audio head to filter the index signal in the P / S mode after preamplification. A reproduction signal output and reproduction index detection circuit 50 for amplifying and amplifying and outputting an audio signal in a reproduction mode. And a playback index signal checking circuit 60 which compares and outputs the signal when the playback index is input, releases the P / S mode, switches to the play mode, and maintains the P / S mode when the index signal is not input. Automatic index function circuit of a video recorder.