KR920000845Y1 - Recording and reproducing circuit for digital screen - Google Patents

Abstract

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Description

Digital special image reproduction and recording circuit

Circuit diagram of the present invention.

* Explanation of symbols for the main parts of the drawings

10: micom 20: input selector

30: digital signal processor 40: playback unit

50: recording unit 1: clamp

2: memory 3: head switching unit

4: Pre-amplification part 5: FM demodulation part

6: BM demodulator 7: FM modulator

8: low pass converter 9: RF modulator

H1-H3: Input terminal H4: Output terminal

IC1: Analog Digital Converter IC2: Digital Signal Processing Direct Element

B1, B2: Buffer CH1, CH2: Head

SW1-SW3: Electronic changeover switch LPF1, LPF2: Low pass filter

BPF1, BPF2: Bandpass Filter R / T: Rotary Transformer

J1: Jack KEY: Key Matrix

M1, M2: Mixer

The present invention provides a digital tape recorder (VTR) capable of digitally processing a video signal to display a special function, and not only visually viewing a special function screen displayed by digital processing, but also recording and recording all special images to edit and preserve special images. The present invention relates to a reproduction and recording circuit of a digital special image.

In general, digital VTRs can display special functions such as ART, MOSAIC, STROBO, and STLL playback that cannot be represented by normal VTRs. It wasn't able to record.

In other words, the conventional digital VTR was only capable of replaying various special functions and could not record the special function screen to be played back, so that the special function screen could not be edited at home and the special function screen could not be recorded and stored.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a reproduction and recording circuit of a digital special image for recording a special function screen that can be reproduced by a digital VTR. The special screen signal processed in is switched to the switching signal of the microcomputer and applied to the recording unit.

This will be described in detail with reference to the accompanying drawings.

The present invention includes an electronic switching switch (SW1) for switching the input signal selected by the input selection unit 20 and the reproduction signal reproduced by the reproduction unit 40 to the control signal of the microcomputer 10, the switching switch (SW1) Digital signal processing unit 30 for processing the signal selected in the digital function control signal according to the digital function control signal of the microcomputer 10 and the special screen signal processed by the digital signal processing unit 30 and the electronic switching switch ( After switching the signal selected in SW1 to the control signal of the microcomputer 10 and having an electronic switching switch (SW2) for applying to the jack J1 and the RF modulator 9, the input signal of the input selector 20 In a digital VTR equipped with a recording section 50 for processing the recording to the head CH1 (CH2), the input signal selected by the input selecting section 20 is connected to the terminal (a) of the electronic switching switch SW3. Connect to the digital signal source The special screen signal processed by the unit 30 is connected to be applied to the terminal b of the electronic switching switch SW3, and the output of the electronic switching switch SW3 switched by the control signal of the microcomputer 10 is recorded in the recording unit ( 50) is configured to be applied to.

That is, according to the present invention, the tuner, the line and the camera signal applied to the input terminals H1-H3 are selected by the input selector 20 and output to the terminal P4, and then the electronic switching switch SW1 and the clamp 1 and The digital function connected to the input terminal P1 of the digital signal processing integrated circuit IC2 via the analog digital converter IC1 and output from the terminal P6 of the microcomputer 10 connected to the key matrix KEY. The control signal controls the digital signal processing integrated device (IC2) connected to the memory (2) to process a special screen, and then the terminal (b) of the electronic switching switch (SW2) through the digital analog converter (IC3) and the buffer (B1). ) Is configured to be applied to the digital signal processing unit 30.

The video signals picked up from the heads CH1 and CH2 and passed through the rotary transformer R / T, the head switching unit 3, and the preamplifier 4 are transferred to the low pass filter LPF1 and the band pass filter ( The BPF1 is separated into a luminance signal Y and a color signal C, demodulated by the EM demodulator 5 and the BM demodulator 6, and then synthesized by the mixer M1 to generate a reproduced signal. And the output of the regeneration unit 40 is applied to the digital signal processing unit 30 through the buffer B2 and the switching switch SW1, and at the same time the jack J1 and the electronic switching switch SW2. It is configured to be applied to the RF modulator (9).

The output of the terminal P4 of the input selector 20 and the output signal of the digital signal processor 30 are selected by the electronic switching switch SW3 and then the luminance signal is passed through the low pass filter LPF2 and the band pass filter BPF2. The recording unit 50 is configured to be separated into the (Y) and the color signal (C), modulated by the FM modulator 7 and the low pass converter 8, and then synthesized by the mixer M2 to generate a recording signal. The output of the recording section 5 is configured such that the tape is recorded at the head CH1 (CH2) via the head switching section 3 of the reproducing section 40 and the rotary transformer R / T.

Here, the switching operation of each of the electronic switching switches SW1-SW3 is controlled by the output of the terminals P4, P3, P5 of the microcomputer 10.

In the present invention configured as described above will be described the operation and effect of each functional block.

The input selector 20 selects one of a tuner, a line, and a camera signal input to the input terminals H1, H2, and H3, and outputs the signal to the terminal P4. The microcomputer 10 generates a key matrix ( Recognizes the function key play of KEY and outputs the control signal of electronic switch SW1, SW2, SW3 to terminals P3, P4 and P5, and outputs the digital function control signal to terminal P6. Let's go.

The digital signal processor 30 fixes the signal selected by the electronic switching switch SW1 to the clamp 1 at a constant potential, and then converts the analog signal into digital data in the analog digital converter IC1 to convert the digital signal processing integrated device IC2 into a digital signal. The digital signal processing integrated device IV2 outputs special screen data by reading and inputting the input data into the memory 2 according to the digital function control signal input of the microcomputer 10 and outputting the special screen data. The special screen data output from IC2) is converted into a special screen signal which is an analog signal by the digital analog converter IC3 and then output through the buffer B1.

Here, a special screen such as art, mosaic, strobe, still picture reproduction, etc. is obtained by the digital function control signal of the microcomputer 10.

The regeneration unit 40 picks up the head CH1 (CH2), and a low pass filter (A / P) of the video signal amplified by the preamplifier 4 through the rotary transformer R / T and the head switching unit 3. LPF1) is separated into a luminance signal (Y) and a color signal (C) by the band pass filter (BPF1), and then demodulated through the BM demodulator (6) of the FM demodulator (5) and mixed in the mixer (M1). To output as a composite video signal.

In addition, the recording unit 50 separates the signal selected by the electronic switching switch (SW3) into a luminance signal (Y) and a color signal (C) through a low pass filter (LPF2) and a band pass filter (BPF2), respectively, FM modulation unit (7) and the low pass converter (8) are modulated and then mixed in the mixer (M2) to the tape through the head switching unit (3), the rotary transformer (R / T) and the head (CH1) (CH2) Will be recorded.

Here, each of the electronic switching switches SW1, SW2, and SW3 is switched by a control signal of the microcomputer 10 that recognizes the function key press of the key matrix KEY.

That is, the terminal connection state of the electronic switching switch (SW1) (SW2) (SW3) which is switched by the control signal output from the terminals (P3), P4 (P5) of the microcomputer 10 is as follows.

TABLE 1

As shown in the first case of the above table, the case where the electronic switching switches SW1, SW2, and SW3 are switched will be described.

In this case, the signal selected by the input selector 20 is applied to the jack J1, the RF modulator 9, the digital signal processor 30, and the recording unit 50.

Therefore, when the monitor is connected to the output terminal H4 of the jack J1 or the RF modulator 9, the input signal is selected from the input selector 20, and the recording unit 50 is issued when the recording command is issued by the microcomputer 10. ) Records the signal selected by the input selector 20.

At this time, since the output side of the digital signal processor 30 is not selected, the digital signal processor 30 is not operated.

However, as shown in the second case in the above table, the case where the electronic switching switches SW1, SW2, and SW3 are switched will be described.

In this case, when the signal selected by the input selector 20 is applied to the jack J1, the RF modulator 9, and the digital signal processor 30, the output of the digital signal processor 30 is applied to the recording unit 50. Will be.

Therefore, when the monitor is connected to the output terminal H4 of the jack J1 or the RF modulator 9, the signal selected by the input selector 20 is viewed, and the digital signal processor 30 uses the digital of the Maacom 10. The special screen signal is applied to the recording unit 50 by the function control signal, and when the recording command is issued by the microcomputer 10, the special screen signal processed by the digital signal processing unit 30 is recorded.

In the table, the case where the electronic switching switches SW1, SW2, and SW3 are switched as in the third case will be described.

At this time, the signal selected by the input selector 20 is applied to the digital signal processor 30 and the recording unit 50, and the special screen signal processed by the digital signal processor 30 is the jack J1 and the RF modulator ( 9) Applied to.

Therefore, when the monitor is connected to the output terminal H4 of the jack J1 or the RF modulator 9, the special screen signal processed by the digital signal processor 30 is viewed, and when the recording command is given, the recording 50 is performed. In this case, the signal selected by the input selector 20 is recorded.

In addition, as shown in the fourth case in the above table, the case where the electronic switching switch (SW1) (SW2) (SW3) is switched.

At this time, the signal selected by the input selector 20 is applied to the digital signal processor 30, and the special screen signal processed by the digital signal processor 30 is the jack J1, the RF modulator 9, and the recording unit ( 50).

Therefore, when the monitor is connected to the jack J1 and the output terminal H4 of the RF modulator 9, the special screen signal processed by the digital signal processor 30 can be watched while the recording command is issued when the recording command is issued. ) Records the special screen signal processed by the digital signal processor 30.

In addition, as shown in the fifth case in the above table, the case where the electronic switching switch (SW1) (SW2) (SW3) is switched.

At this time, the signal reproduced by the playback unit 40 is applied to the jack J1 or the RF modulator 9 and the digital signal processing unit 30, and the signal selected by the input selection unit 20 is applied to the recording unit 50. Will be.

Accordingly, when the monitor is connected to the output terminal H4 of the jack J1 or the RF modulator 9, the playback unit 40 can watch the signal reproduced by the playback unit 40. At this time, even if the recording command is issued by the microcomputer 10, the playback unit 40 Is not being recorded, so the signal selected by the input selector 20 cannot be recorded.

At this time, since the output side of the digital signal processor 30 is not selected, the digital signal processor 30 is not operated.

However, as shown in the sixth case in the above table, the case where the electronic switching switch (SW1) (SW2) (SW3) is switched.

At this time, the signal reproduced by the playback unit 40 is applied to the jack J1, the RF modulator 9, and the digital signal processing unit 30, and the output of the digital signal processing unit 30 is applied to the recording unit 50. Will be.

Therefore, when the monitor is connected to the output terminal H4 of the jack J1 or the RF modulator 9, the reproduced signal is watched by the playback unit 40, and the digital signal processing unit 30 performs the digital function of the microcomputer 10. A special screen signal is applied to the recording unit 50 according to the control signal, but at this time, the recording unit 50 processes the digital signal processing unit 30 because the playback unit 40 is still playing even if the recording command is issued by the microcomputer 10. Can not record a special screen signal.

In the table, the case where the electronic switching switches SW1, SW2, and SW3 are switched as in the seventh case will be described.

In this case, the signal selected by the input selector 20 is applied to the recording unit 50, and the signal reproduced by the playback unit 40 is applied to the digital signal processing unit 30 and processed by the digital signal processing unit 30. The special screen signal is applied to the jack J1 and the RF modulator 9.

Accordingly, when the monitor is connected to the output terminal H4 of the jack J1 or the RF modulator 9, the special screen signal processed by the digital signal processing unit 30 is viewed, and the playback is performed even when a recording command is issued by the microcomputer 10. Since the unit 40 is in the playback operation, the recording unit 50 cannot record the signal selected by the input selection unit 20.

In the table, as shown in the eighth case, the case where the electronic switching switches SW1, SW2, and SW3 are switched will be described.

At this time, the signal reproduced by the reproduction unit 40 is applied to the digital signal processing unit 30, and the special screen signal processed by the digital signal processing unit 30 is the jack J1, the RF modulator 9, and the recording unit ( 50).

Therefore, when the monitor is connected to the output terminal H4 of the jack J1 or the RF modulator 9, the special screen signal processed by the digital signal processor 30 can be viewed while the recording command is issued by the microcomputer 10 at this time. Since the reproduction unit 40 is in the reproduction operation, the recording unit 50 cannot record the special screen signal processed by the digital signal processing unit 30.

As described above, the present invention is designed to be recorded at the request of a user without watching a specially processed special screen signal, so that the editing of a special image can be easily performed and can be stored.

Claims (1)

The input signal selected by the input selection unit 20 is provided with an electronic switching switch (SW1) for switching the playback signal reproduced by the playback unit 40 to the control signal of the microcomputer 10 and selected by the switching switch (SW1) Digital signal processor 30 for processing the signal as a special function screen signal according to the digital function control signal of the microcomputer 10 and the special screen signal processed by the digital signal processor 30 and the electronic switching switch (SW1) After switching the selected signal to the control signal of the microcomputer 10 and having an electronic switching switch (SW2) for applying to the jack (J1) and the RF modulator 9, the input signal of the input selector 20 is processed In a digital VTR equipped with a recording section 50 for recording in the head CH1 (CH2), the input signal selected by the input selecting section 20 is applied to the terminal a of the electronic switching switch SW3. Connection, and the digital signal The special screen signal processed by the processor 30 is connected to the terminal b of the electronic switch SW3 and the output of the electronic switch SW3 is switched to the control signal of the microcomputer 10. 50) A reproduction and recording circuit for a digital special image, which is configured to be connected to 50).