KR100220176B1 - Video signal control apparatus of a multi-tvcr - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal processing apparatus of a multi-TVCR, which recognizes a user's selection through a key input unit or a remote controller or an abnormal state of an internal device. Microprocessor for controlling the overall operation, Servo drive system for controlling the circuit operation according to the signal processing according to the recording, playback, etc. of the cassette tape under the control of the microprocessor, Phase control for channel selection from the microprocessor First and second intermediate frequency amplifiers for amplifying and detecting a TV broadcast signal tuned by first and second tuners receiving the signal and outputting the signal as an intermediate frequency signal having a constant frequency; Image signal from intermediate frequency signal output from frequency amplifier First and second detectors for detecting and outputting a signal; a trap unit for selectively removing an audio signal included in an image signal output from the first detector; and the trap unit under control of the microprocessor. A first switching IC for selectively outputting an image signal input to one side and an image signal input to the other side, and a luminance signal and a color difference signal from a color demodulator which receives an image signal from the first switching IC; At the first contact point operated by the CRT driving unit which represents the image on the screen and the control signal (AV / TUNER) of the microprocessor, the video signal from the second detector and the video signal reproduced by the external video cassette recorder are input to both sides. A second to be operated by the control signal PB while being transferred to the servo drive system and recorded by the head. The contact point receives a video signal from a servo drive system and a video signal input from an external video cassette recorder on both sides and outputs the second switching IC to the other side of the first switching IC and a control signal (PB) of the microprocessor. ), (V / T) is built-in by consisting of the third switching IC to receive the video signal from the trap unit, the second detector and the servo drive system and to selectively output and record to the external video cassette recorder Through the two tuners, the TV broadcast signal of one channel received from the outside is recorded on a cassette tape so that the TV broadcast signal of another channel can be viewed.

Description

Video signal processing device of multi TVCR

1 is a block diagram showing a schematic configuration of a TVCR according to the present invention.

2 is a flowchart showing the operation of the present invention.

* Explanation of symbols for main parts of the drawings

3: microprocessor 13,15: detector

16: l switching IC 21: second switching IC

24: third switching IC

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video signal processing apparatus of a multi-TVCR. Particularly, a TVCR using a TVCR randomly receives all TV broadcast signals from all over the world through one tuner and records them on a cassette tape. The present invention relates to a video signal processing device of a multi-TVCR that can be received and viewed.

In general, a TVCR (Tele Video Casette Recorder) can receive a TV broadcast signal from the outside and record it on an internal cassette tape while receiving an antenna, or play a composite video signal recorded on a cassette tape and view it through a monitor and a speaker. It is a well known fact that

In the TVCR, the user could record the television broadcast signal received through the antenna and tuned in the tuner while the cassette tape was inserted into the deck, and at the same time, the TV broadcast of the channel currently being recorded through the monitor.

Therefore, a user using a TVCR can record or watch TV broadcast signals received from an external source through an antenna, and can record or watch TV broadcast signals using a cassette tape inserted in a deck or a cassette tape. The composite video signal can be reproduced when needed.

However, according to the conventional TVCR as described above, since one tuner is provided therein, it is not possible to simultaneously watch television broadcast signals of other channels while recording television broadcast signals received through an arbitrary channel.

Accordingly, according to the present invention, two TVCRs are built in a TVCR so that a TV broadcast signal of one channel received from the outside can be recorded on a cassette tape by KBPS (Korea Broadcasting Program Service) or a TV broadcast signal of another channel can be watched. It is an object of the present invention to provide a video signal processing apparatus.

In order to achieve the above object, the present invention recognizes a user's selection through a key input unit or a remote controller, or recognizes an abnormal state therein, and controls overall operations such as channel selection and signal processing according to an operation method or a procedure set in the program memory. A microprocessor to control the microprocessor, the capstan drive system generating a capstan pulse for calculating a moving amount of the cassette tape while moving the cassette tape at a constant speed or a high speed, and the cassette tape under the control of the microprocessor. Deck drive system for controlling operation such as driving and driving, Servo drive system for controlling the circuit operation according to signal processing according to recording and playback of cassette tape under the control of the microprocessor, and channel selection from the microprocessor. First and second tuners tuned to a television broadcast signal corresponding to a channel to be watched among a plurality of television broadcast signals received through an antenna while receiving a phase control signal for the first and second televisions tuned by the first and second tuners; First and second intermediate frequency amplification units which amplify and detect a broadcast signal by mixing with the output of the local oscillator and output the intermediate frequency signals having a constant frequency, and the intermediate outputs from the first and second intermediate frequency intermediate parts. First and second detectors for detecting and outputting an image signal from a frequency signal, a trap unit for removing an audio signal included in an image signal output from the first detector, and under control of the microprocessor, A first switch for selectively outputting the video signal input to one side and the video signal input to the other side from the trap unit A color demodulator for inputting a video signal from the IC, the first switching IC and processing the signal, and outputting a luminance signal and a chrominance signal, and receiving a luminance signal and a chrominance signal from the color demodulator. A CRT driver for detecting a character broadcast signal from the first switching IC, a teletext processor for expressing numerals and characters on a monitor, and a control signal (AV / TUNER) of the microprocessor. The first contact point receives the video signal from the second detector and the video signal reproduced by the external video cassette recorder on both sides and transfers the signal to the servo drive system for recording by the head while operating by the control signal PB. At the second contact point, the video signal from the servo drive system and the video signal input from an external video cassette recorder are received at both sides, and the first signal is received. The second switching IC outputs to the other side of the switching IC and the control signals PB and V / T of the microprocessor while receiving image signals from the trap unit, the second detector and the servo drive system, respectively. By configuring the third switching ICs to selectively output and record to the video cassette recorder, two channels of built-in tuners can be used to watch the television broadcast signal of another channel while recording the TV broadcast signal of the channel received from the outside on the cassette tape. To be.

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

Power key (PWR), playback key (PB), recording key (REC), rewind key (REW), fast forward key (FF), stop key (STOP), channel up / down key (CH), volume up / down Key input unit 1 for directly inputting the user's options with a key V0L and a tuner selection key TUN, power key PWR, playback key PB, recording key REC and rewind Key (R), Fast Forward Key (FF), Stop Key (STOP), Channel Up / Down Key (CH), Volume Up / Down Key (VOL), Selection Key (TUN), Function Selection Key (CTL), etc. The operation method or the procedure already set in the built-in program memory 4 according to the remote control unit 2 and the key input unit 1 or the user's selection through the key input unit 1 or the remote control unit 2 or the operating state of the internal devices. Microprocessor 3 which controls overall operations such as channel tuning and signal processing by the microprocessor 3 and the microprocessor 3 The capstan drive system 5 which generates a capstan pulse for calculating the moving amount of the cassette tape while moving the cassette tape at a constant speed or a high speed; and operation of mounting and running the cassette tape under the control of the microprocessor 3. A deck drive agent 6 for controlling the control, a servo drive system 7 for controlling a circuit operation according to signal processing by recording, reproducing, etc. of a cassette tape under the control of the microprocessor 3, and the microprocessor described above. First and second tuners 8 for tuning the television broadcast signal corresponding to the channel to be watched among the various television broadcast signals received through the antenna 10 by the phase control signal for channel selection from (3), ( 9) and amplified and detected by mixing with the output of the local oscillation unit for the television broadcast signals tuned in the first and second tuners 8 and 9; First and second intermediate frequency amplifiers 11 and 12 for outputting intermediate frequency signals of a predetermined frequency, and intermediate frequencies output from the first and second intermediate frequency amplifiers 11 and 12. When the first and second detectors 13 and 14 detect and output a video signal from the signal and the broadcast signal processing control signal NT of the microprocessor 3 is input, the broadcast is NTSC 3.58. The trap unit 15 for removing the audio signal included in the video signal output from the first detector 13 and the trap while receiving the internal and external selection signals INT / EXT of the microprocessor 3. A first switching IC l6 for selectively outputting a video signal to the unit 15 and a color signal for outputting a luminance signal and a color difference signal after signal processing after receiving a video signal from the first switching IC 16; A demodulation section 17 and the color demodulation section 17 receive a luminance signal and a color difference signal to the monitor 19. A CRT driver 18 for displaying an image, a teletext processor 20 for detecting a character broadcast signal from the first switching IC 16 and expressing numbers and characters on a monitor 19, and the microprocessor At the first contact point 21a operated by the control signal AV / TUNER of (3), the video signal from the second detector 14 and the video signal reproduced by the external video cassette recorder 22 are transferred to both sides. The video signal from the servo drive system 7 is received at the second contact point 2lb which is inputted to the servo drive system 7 to be recorded by the head 23 and operated by the control signal PB. A second switching IC 21 for receiving video signals input from an external video cassette recorder 22 on both sides and outputting them to the other side of the first switching IC 16, and a control signal of the microprocessor 3 ( PB) and the trap unit 15 and the second detector while receiving (V / T) (3) and a third switching IC (24) for receiving video signals from the servo drive system (7) and selectively outputting and recording them to an external video cassette recorder (22), and the second detector (14). And recording according to the KBPS processing unit 25 which transmits the information according to the time of the broadcast program to the microprocessor 3 from the trap unit 15 for one week, and the KBPS information received through the KBPS processing unit 25. It is composed of the TS (Video Program System) (26).

The video signal processing apparatus of the multi-TVCR of the present invention configured as described above enables the reception of multiple systems around the world through the first tuner 8 and the second tuner 9, and the first detector 13 and the first switching. The IC 16, the color demodulator 17, and the CRT driver 18 enable signal processing of multiple systems around the world. The operation process will be described with reference to FIG.

When the user inputs a channel selection through the key up force l or the remote controller 2 (step 30), the microprocessor 3, which has recognized this, again selects a tuner 8 via the tuner selection key TUN, It is recognized whether (9) is optional (step 31).

The microprocessor (3) receiving the control signal and tuner selection specification for channel selection outputs a phase control signal according to channel selection, and the television corresponding to the channel to be watched among the various television broadcast signals received through the antenna (10). The first intermediate frequency amplifier 11 or the second intermediate frequency amplifier 12 receiving the tuned television broadcast signal after allowing the broadcast signal to be tuned by the first tuner 8 or the second tuner 9 is localized. Amplified and detected by mixing with the output of the oscillator to output as an intermediate frequency signal of a constant frequency to detect and output an image signal from the first detector 13 or the second detector 14, respectively (step 32). ).

If the television broadcast signal is broadcast of NTSC 3.58 (step 33), the microprocessor 3 outputs the broadcast signal processing control signal NT to the trap unit 19 as H to the first detector 17. When the user selects the mode of playback (step 35), the microprocessor 3 recognizes this and outputs the control signal PB as H (step 34). The video signal reproduced by the head 23 via the servo drive system 7 and then output to the external video cassette recorder via the third switching IC 24 to be recorded (step 36). 2 is connected to the other side of the first switch IC 16 via the second contact 21b of the switching IC 21 so as to be switched through the internal and external selection signals INT / EXT from the microprocessor 3. Through the first switch IC 16 to be viewed by the monitor 19 (step 37 ).

On the other hand, if the user wants to watch the normal channel while recording the scrambled channel (step 38), the microprocessor 3 which recognizes this outputs the phase control signal to the second tuner 9 to output the television broadcast signal of the desired channel. After receiving (step 39), the third switching IC 24 outputs the control signal V / T to H and scrambles it via the second intermediate frequency amplifier 12 and the second detector 14. The released television broadcast signal is outputted to the external video cassette recorder 22 via the third switching IC 24 (step 40), and the control signal (1) is transmitted to the first contact 21a of the second switching IC 21. AV / TUNER) is outputted as H so that the television broadcast signal input through the second detector 14 is transmitted to the head 23 via the servo drive system 7 for recording (step 41). Television of the general channel via the first tuner 8, the first intermediate frequency amplifier 11, and the first detector 13 Broadcast signal is to be referred to as a first monitor switch IC 19 through the 16 connected to switch by a microprocessor (3) internal and external selection signals (INT / EXT) of from (step 42).

When watching the scrambled channel while recording the normal channel (step 43), the first contact 21a of the second switching IC 21 through which the television broadcast signal via the second detector 14 is inputted has a microcomputer. The television broadcast signal inputted through the second detector 14 to the first contact point 21a of the second switching IC 21 by outputting the control signal AV / TUNER from the processor 3 to H. Is transmitted to the head 23 via the servo drive system 7 to be recorded (step 44), while the scrambled composite video signal is detected by the first tuner 8, the first intermediate frequency amplifier 11, and the first detection. The external video cassette recorder according to a state of being switched to and connected by the control signal V / T of the microprocessor 3 by being input to the third switching IC 24 via the unit 13 and the trap unit 15. 22) to enable recording (step 45), while at the same time from the microprocessor 3 After the first switching IC (l6) connected to switch by an external select signal (INT / EXT) is to be viewed on the monitor 19 (step 46).

Accordingly, the video signal processing apparatus of the multi-TVCR according to the present invention includes a microprocessor that recognizes a user's selection and controls overall operations such as channel selection and signal processing, and a constant frequency for the television broadcast signals tuned by the two tuners. Two intermediate frequency amplifiers for outputting the intermediate frequency signals of the first and second traps for selectively removing audio signals included in the video signals which are outputs of the two detectors detecting the video signals from the two intermediate frequency signals, and the traps. A first switching IC for selectively outputting a video signal input to one side and a video signal input to the other side, a CRT driver for displaying a video signal from the first switching IC as an image, and controlling the microprocessor. And the first contact is re-created by the video signal from the detector and from an external video cassette recorder. The second switching IC selectively outputs the video signal from the servo drive system and the video signal input from the external video cassette recorder to the first switching IC while selectively transmitting the video signal to the servo drive system for recording. And third switching ICs configured to receive video signals from the trap unit, the second detector, and the servo drive system under the control of the microprocessor, and selectively output the video signals to an external video cassette recorder for recording. It is possible to watch a television broadcast signal of another channel while recording a television broadcast signal of one channel received from the outside through a tuner on a cassette tape.

Claims (4)

As the microprocessor, which recognizes the user's choice, controls the overall operation such as channel tuning and signal processing, the servo drive system controls the circuitry operations such as recording and playing back cassette tapes, and tunes the TV tuned in the first and second tuners. When the video signal is output after the broadcast signal is processed by the first and second detectors that receive the weekly frequency signal through the first and second intermediate frequency amplifiers, and outputs the video signal, the trap unit selectively removes the audio signal included in the video signal. In a multi-TVCR video signal processing apparatus for selectively outputting to a CRT driver and an external video cassette recorder, the video signal of two channels input to one side and the other side from the trap unit is selectively outputted to the CRT driver. The first switching IC and the microprocessor are controlled by the microprocessor. While transmitting the video signal from the second detector or the video signal reproduced by the external video cassette recorder to the servo drive system, at the second contact point, the video signal from the servo drive system or the video signal input from the external video cassette recorder is received. A second switching IC for outputting to a switching IC, and a third switching IC for selectively outputting and recording video signals from a trap unit, a second detector or a servo drive system to an external video cassette recorder under the control of the microprocessor. Video signal processing device of a multi-TVCR, characterized in that consisting of. The switching IC of claim 1, wherein the switching IC selectively outputs an image signal input to one side or an image signal input to the other side from the trap unit while receiving an internal and external selection signal (INT / EXT) from a microprocessor. Multi-TVCR video signal processing device enabled. The second switching IC of claim 1, wherein the second switching IC has both sides of a video signal from a second detector and a video signal reproduced by an external video cassette recorder at a first contact point operated by a control signal (AV / TUNER) of the microprocessor. Receives the video signal from the servo drive system and the video signal input from the external video cassette recorder on both sides at the second contact operated by the control signal at the same time. And a video signal processing device of a multi-TVCR which is output to the other side of the first switching IC. The video cassette according to claim 1, wherein the third switching IC receives the video signals from the trap unit, the second detector, and the servo drive system while receiving the control signals PB and V / T of the microprocessor. Video signal processing device for multi-TVCR to be selectively output to recorder to record.