KR980011205A - Power Saving Control Circuit and Method in VCS (VCR) - Google Patents

Abstract

In the present invention, when the Vishial is simply used for frequency tuning without performing the recording and reproducing operations of the video tape, the Vishial main power source is turned off and only the power supplied to the tuner is turned on to thereby reduce the power consumed by the Vishial To a power saving control circuit and method in a VCR (VCR).

To this end, according to the present invention, power supply means for supplying power to the tuner unit and the PIF detection unit when the power is automatically turned off, for outputting the channel signal input to the tuner unit through the antenna to the video and audio lines; When Vsial is used for frequency tuning for a certain period of time, data necessary for tuning is stored and supplied to the tuner section. At the same time, main power is cut off. When the channel increase / decrease key is input, the tuner on signal is output The power supply means is selectively controlled to supply the operation power and the second output path is set so that the video signal input through the antenna is received by the tuner of Vishal even when the main power is off and then transmitted to the display- A microprocessor for controlling a series of operations to be performed; And output path switching means for switching the output path so that the video / audio output signal is directly applied to the external line by switching according to the control signal of the microprocessor.

Description

Power Saving Control Circuit and Method in VCS (VCR)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a VCR (Video Cassette Recorder), and more particularly, to a video cassette recorder (VCR) When used, Vishal's microprocessor checks its usage status and automatically cuts off the Vishial's main power supply after a certain period of time, and selectively supplies power only to the part needed to use the tuner at the same time, To a power saving control circuit and method in a VCR (VCR).

As shown in FIG. 1, a conventional V-SIR includes a frequency tuning circuit, a PLL (Phase Locked Loop) IC, and a tuner unit including a local oscillator and a frequency synthesizing circuit for receiving a broadcast signal transmitted through airwaves through an antenna 10) to provide a tuned voltage (< RTI ID = 0.0 > (SIF) for a broadcast signal of a channel selected by the tuner unit, and outputs the detected image and audio intermediate frequency signal (VIF) And a PIF detecting unit 20 for outputting an AFT detection signal according to an input receiving electric field to a microprocessor for automatic fine tuning (AFT).

There is provided a key input unit 60 for selecting an operation mode of the vial by an interface with a user.

Further, it controls a power on / off operation and a deck operation related to recording / reproduction with a key input signal selected by a user, and controls the PLL IC of the tuner unit to variably output the frequency tuning voltage (V _T ) (AFT) of AFT (automatic fine tuning) is performed to perform a synchronous search operation on a desired channel. When a desired channel is selected, an optimum tuning voltage (V _T ) is set by executing AFT by window search, VCR) or a tuner / line mode selection signal (TV / VCR) to the PLL IC so as to control a series of operations for completing the AFT operation and terminating the channel tuning operation. And a switching unit 30 for switching and outputting a PIF or SIF signal to an external video / audio output terminal (Video out) according to a tuner / line.

In the conventional Vsial, the AC power supplied through the power plug according to the power control signal (Pon) supplied from the microprocessor is converted into various voltages required in the load by using the switching control method. A supply unit 50 is provided to selectively supply the main power supply Vcc and the end power supply Vever to each part of the Vsial.

When a monitor dedicated only to the display is connected to the conventional Vsial having such a configuration, it can be connected using the video / audio output terminal (Video out). In the monitor connected to the Vsial, the Vsial tuner unit 10 The tuner unit 10 is operated by receiving the tuner on signal Ton provided from the microprocessor 40 when the power source is turned on at the time of turning on the power of the tuner unit 10, / Vsial Mode Select signal (TV / VCR), the video and audio signals received from the antenna when the TV is set to 2 channels (3 or 4 channels in Korea or USA, 1 or 2 channels in Japan or Korea) 2 channels).

The Vsial is always powered on before the user turns off the power, so that the cables (video and audio output lines) connected between the Vsial and the display-only monitor are turned on when the main power of the Vsial is turned off, There is no signal output to the monitor and the channel increase / decrease key provided in the key input unit 60 does not operate.

In addition, as described above, the Vsial connected to the display-only monitor must be in the main power-on state before the operation of the Vsial tuner unit can be normally operated to perform the operation related to the frequency tuning. If the main power source of the Vsial is off, The signal can not be displayed on the video / audio output terminal output to the outside of the vial and the monitor can not watch the broadcast signal.

Therefore, there is a problem in that power consumption is increased in unnecessary places of the Vsial since the main power source of the Vsial must be always turned on even when the Vsial is simply used for frequency tuning by connecting a monitor dedicated to the Vsial to the display.

Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a tuner-on-signal generator for automatically shutting off a main power source when a viasial is used for frequency tuning for a predetermined period of time, And the second output path is set so that the video signal input through the antenna can be received by the tuner of the Vishal even after the main power is turned off, The present invention provides a power saving control circuit in a VCR capable of reducing the power consumed by a sial.

Another object of the present invention is to provide a microprocessor which, when the Vishal is used only as a part of a function, automatically checks the use state of the microprocessor and automatically cut off the main power supply after a predetermined time, A video signal coming through the antenna through the antenna can be received by the tuner of the Vishal and then can be viewed on the monitor for display only and a channel increase / And a power saving method in a slave (VCR).

According to another aspect of the present invention, there is provided a mobile communication terminal comprising: power supply means for supplying power to a tuner unit and a PIF detection unit in order to output a channel signal input to a tuner unit through an antenna, When Vsial is used for frequency tuning for a certain period of time, data necessary for tuning is stored and supplied to the tuner section. At the same time, main power is cut off. When the channel increase / decrease key is input, the tuner on signal is output The power supply means is selectively controlled to supply the operation power and the second output path is set so that the video signal input through the antenna is received by the tuner of Vishal even when the main power is off and then transmitted to the display- A microprocessor for controlling a series of operations to be performed; And output path switching means for switching the output path so that the video / audio output signal is directly applied to the external line by switching according to the control signal of the microprocessor. do.

According to another aspect of the present invention, there is provided an operation mode determination method comprising: determining an operation mode discrimination step of determining whether a power saving control is required by checking a usage state of vias; As a result of the determination in the operation mode determination step, if power saving control is required, the main power source is automatically shut off after a predetermined time, and when a channel increase / decrease key is input, a tuner on signal is output to output a video signal and a voice signal directly to a video / And a power saving mode execution step of switching the output of the power saving mode so as to output the power saving mode.

1 is a block diagram showing a part of a conventional vial.

2 is a block diagram of a power saving control circuit in vias according to the present invention;

3 is a flow chart showing a power saving control method for Vsial according to the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

10A: Tuner section 20A: PIF detection section

30A, 30B: switching section 40A: microprocessor

50A: main power supply unit 60: key input unit

OR1: logic gate Vcc1, Vcc3; Ever power

Ton: Tuner on signal Pon: Power on signal

Poff: Power-off signal V _T : Tuning voltage

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a power saving control circuit and method in a VCR of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram schematically showing the configuration of a power saving control circuit in a VCR (VCR) according to an embodiment of the present invention. The first power source Vcc1 is always supplied with a power source And a tuner unit 10A for operating the second power source Vcc2 as an auxiliary power source, The third power supply Vcc3, which is a combination of the output of the tuner-on signal output from the microprocessor and the power-off signal, is supplied to the main power supply, And a PIF detector 20A for detecting and outputting an image and voice intermediate frequency signal (VIF) SIF for a broadcast signal of a channel selected in a channel and outputting an AFT detection signal to a microprocessor.

In the same way as in the conventional case, a key input unit 60 is provided for selecting an operation mode of the vial by an interface with a user.

Also, a power on / off operation and a deck operation related to recording / playback are controlled by a key input signal selected by a user, or a desired channel is selected by controlling the tuner unit and the PIF detection unit, A microprocessor 40A having a program for controlling power supply so as to supply main power to a part necessary for tuner operation when it is judged that the Vishal is used only for frequency tuning without performing a recording / reproducing operation, .

The VIF and SIF outputs of the PIF detection unit are output to an external video / audio output terminal (Video out) (Audio out) according to a TV / VCR mode selection signal (TV / VCR) or a tuner / line mode selection signal (VIF) and a SIF output of the PIF detecting unit as an output path switching unit to an external video / audio output terminal (Video out) (Audio out) according to a tuner on signal (Ton) And a second switching unit 30B for directly outputting the output.

As a power supply means, a main power source (AC) capable of converting an AC power source (AC) input through a power plug according to a power control signal (Pon) supplied from the microprocessor A supply unit 50A is provided to selectively supply a main power source and a main power source to each part of the Vsial, and the tuner on signal Ton or the main power OFF signal Poff of the microprocessor is logically combined And a logic gate (OR1) for supplying the main power supply of the main power supply unit to the operating power supply of the PIF detecting unit.

FIG. 3 is an operation flowchart showing a power saving control method in Vsial according to the present invention, wherein an operation mode determination step of determining whether or not power saving control is required is checked by checking the use state of Vsial, (S12-S16) of checking whether a cassette input, an FG of a drum, or an FG of a capstan is present, if the power is on, .

In the power saving mode execution step, if it is determined that the power saving control is not required as a result of the determination in the operation mode determination step, a step S17 of maintaining the main power ON state as it is, (S18-S19) of checking if a channel increase / decrease key is inputted, and if a channel increase / decrease key is inputted, a tuner on signal is outputted to supply operating power to the tuner unit and the PIF detecting unit (S20-S21) of outputting a video signal received through the antenna in a power saving state to a display-dedicated monitor.

The power saving control circuit and method in a VCR (VCR) according to the present invention configured as described above will be described in detail as follows.

First, the microprocessor 40 checks the current VCR operation state (S12-S16) in the main power-on state (Y branch of S11) and judges whether the tape recording or reproducing operation is performed for a predetermined period of time, The main power supply unit 50A is automatically controlled to turn off the main power (S20) while storing the memorized channel (S18), thereby operating the vise arm in the power saving mode, The tuner unit 10A and the second switching unit 30B are operated by outputting the tuner ON signal Ton and simultaneously the aver power Vcc3 is supplied to the PIF detecting unit 20A to be transmitted through the line cable connected to the monitor The tuner unit 10A and the PIF detecting unit 20A are operated so as to automatically search for the channel that has been viewed in the first tuner line and output a desired screen, It allows the signal to be passed to line out.

According to the power saving control circuit and method in the VCR according to the present invention, when the Vsial is used, the video signal input from the antenna is outputted through the Vsial line output jack, When used, Vsial is controlled to save power by turning off the main power, but receiving each channel by the Ever power supplied to the tuner, so that when Vsial is simply used for frequency tuning, There is a useful feature that can prevent waste of power unnecessarily consumed.

Claims (3)

Power supply means for supplying power to the tuner unit and the PIF detection unit when the power is automatically turned off so as to output the channel signal input to the tuner unit through the antenna to the video and audio lines; When Vsial is used for frequency tuning for a certain period of time, data necessary for tuning is stored and supplied to the tuner section. At the same time, main power is cut off. When the channel increase / decrease key is input, the tuner on signal is output The power supply means is selectively controlled to supply the operating power and the second output path is set so that a series of operations for receiving the video signal input through the antenna by the tuner and transmitting the received video signal to the monitor for display only, A microprocessor; And output path switching means for switching the output path so that the video / audio output signal is directly applied to the external line by switching according to the control signal of the microprocessor. The microprocessor of claim 1, wherein the power supply unit includes a main power supply unit (50A) for converting the alternating current power to a voltage required by each part of the vial and outputting the main power and the aver power according to a power control signal supplied from the microprocessor, ); And a logic gate (OR1) for combining the main power supply output from the main power supply unit so that the main power supply can be supplied to the tuner unit by turning off the main power and by a tuner on signal. An operating mode discriminating step of discriminating whether or not power saving control is required by checking the use state of Vsial; As a result of the determination in the operation mode determination step, if power saving control is required, the main power source is automatically shut off after a predetermined time, and when a channel increase / decrease key is input, a tuner on signal is output to output a video signal and a voice signal directly to a video / And a power saving mode execution step of switching the output of the power saving mode to output the power saving mode. ※ Note: It is disclosed by the contents of the first application.