KR0123251Y1 - Power supply for hifi vcr - Google Patents

Abstract

The present invention relates to a hi-fi video cassette recorder, and more particularly, to a power supply of a hi-fi video cassette recorder for selectively supplying power to a hi-fi audio mode and a mono audio mode. A mono signal processor 40 for reproducing and processing a mono signal recorded on a tape, a hi-fi signal processor 30 for reproducing and processing a hi-fi signal recorded on the magnetic tape, the mono signal processor 40, and A hi-fi comprising a control unit 20 for controlling the driving of the hi-fi signal processing unit 30 and a power supply unit 10 for supplying power to the mono signal processing unit 40 and the hi-fi signal processing unit 30. In the power supply device of the video cassette recorder, the power supply unit 10 and the mono signal processing unit 40 is configured, the control unit 20 A first switching unit (100) switched under the control of the control unit and selectively applying the output power of the power supply unit (10) to the mono signal processing unit (40); It is configured between the power supply unit 10 and the hi-fi signal processing unit 30, is switched under the control of the control unit 20 to output the output power of the power supply unit 10 to the hi-fi signal processing unit 30 It further includes a second switching unit 200 to selectively apply. Therefore, there is an effect of preventing unnecessary power consumption.

Description

Hi-Fi Video Cassette Recorder Power Supply

Figure is a block diagram showing the configuration of a power supply of a hi-fi video cassette recorder according to the present invention.

＊ Explanation of symbols on main parts of drawing

10: power supply unit 20: control unit

30: hi-fi signal processing unit 40: mono signal processing unit

100: first switching unit 200: second switching unit

The present invention relates to a Hi-Fi VIDEO CASSETTE RECORDER (hereinafter referred to as Hi-Fi V-Cal), and in particular, a hi-fi video cassette recorder selectively supplying power to a hi-fi audio mode and a mono audio mode. Relates to a power supply.

In general, high fidelity VRL is a faithful recording and reproducing of the original sound.

In general, V-Cal records audio signals using an AC bias according to a fixed head method as in an audio tape recorder. At this time, in the fixed head method, when the tape travels for a long time, the running speed of the tape is lowered, the frequency characteristics are lowered, and high sound quality can be obtained.

In addition, the tape running speed of V-Cal is much lower than the tape running speed of the audio cassette tape recorder as is known. Therefore, Hi Five TV is used for recording and reproduction of audio signals by focusing on the rotating heads used for recording and reproduction of video signals.

The recording method of the high fidelity CD described above records the magnetic signal on the magnetic tape by using a rotating head for FM-modulating the audio signal and recording the video signal as described above. In other words, Hi-FV recording method adds two voice-only rotary heads to record the frequency-modulated voice signal in the deep part of the magnetic layer of the magnetic tape, and duplicates the video signal on the surface layer in two steps. do.

When reproducing, the filter detects only the portion having the FM audio signal carrier so as not to be mixed with the video signal, demodulates it with a processor similar to that implemented in the FM radio, and extracts it as audio.

That is, during playback, the state of the audio signal recorded on the videotape, that is, the hi-fi signal and the mono signal, is detected and processed by the hi-fi signal processing unit (not shown) if the detected audio signal is a hi-fi signal, and if the mono signal is mono The signal processor (not shown) processes and outputs the same.

In this case, since the power supply unit (not shown) always supplies constant power to the hi-fi signal processing unit (not shown) and the mono signal processing unit (not shown), unnecessary power is consumed.

The present invention is devised to solve the above-described problem, an object of the present invention is to provide a high-fidelity TV to prevent power waste by selectively controlling the power supply according to the hi-fi audio mode and mono audio mode selected by the user To provide a power supply.

The high-fidelity power supply apparatus according to the present invention includes a mono signal processing unit for reproducing and processing a mono signal recorded on a magnetic tape, and a hi-fi signal processing unit for reproducing and processing a hi-fi signal recorded on the magnetic tape; And a control unit controlling driving of the mono signal processing unit and the hi-fi signal processing unit, and a power supply unit supplying power to the mono signal processing unit and the hi-fi signal processing unit. A first switching unit configured between the power supply unit and the mono signal processing unit and switched under control of the controller to selectively apply output power of the power supply unit to the mono signal processing unit; And a second switching unit configured between the power supply unit and the hi-fi signal processing unit, and switched under the control of the controller to selectively apply output power of the power supply unit to the hi-fi signal processing unit.

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

Figure is a block diagram showing the configuration of a high-fidelity power supply apparatus according to the present invention, the power supply unit 10, the control unit 20, a high-fidelity video cassette recorder, a mono signal processing unit 40, the first switching unit ( 100) and a second switching unit 200.

The power supply unit 10 includes a switching mode power supply (SMPS) and the like, and reproduces and processes a hi-fi signal processing unit 30 and a mono signal that reproduces and processes a hi-fi signal and outputs it to an audio output terminal. To supply power to the mono signal processor 40 for outputting to the audio output terminal.

The control unit 20 is usually configured as a microcomputer, and is configured to output a VCAL operation control signal according to a predetermined key signal applied from a key matrix not shown in the drawing. As shown in the following description, the first switching is performed. The control unit 100 and the second switching unit 200 are controlled.

That is, the first switching unit 100 is connected between the power supply unit 10 and the mono signal processing unit 40 to be selectively driven according to the control signal output from the control unit 20, and the first transistor Q1 and the first switching unit 100 are driven. It consists of two transistors Q2.

In addition, the second switching unit 200 is connected between the power supply unit 10 and the hi-fi signal processing unit 30 is selectively driven according to the control signal output from the control unit 20, and the third transistor (Q3) and 4th transistor Q4.

At this time, the control unit 20 is a high signal to the first switching unit 100 and the second switching unit 200 if the predetermined key signal input from the key matrix (not shown) is a key signal for selecting the hi-fi audio mode. Outputs the logic signal of the level.

If the predetermined key signal input from the key metrics (not shown) is a key signal for selecting a mono audio mode, the controller 20 may provide a low level to the first switching unit 100 and the second switching unit 200. Outputs a logic signal of.

At this time, those skilled in the art will readily understand that the logic signal output from the controller 20 may be set differently in system design.

As described above, when the logic signal output from the controller 20 is a high level logic signal, a high level voltage is applied to the base of the NPN-type fourth transistor Q4 and the base of the NPN-type second transistor Q2. The fourth transistor Q4 and the second transistor Q2 are conductive.

Accordingly, since a low level voltage is applied to the PNP type third transistor Q3 and the NPN type first transistor Q1, the third transistor Q3 is turned on, and the first transistor Q1 is not turned on. The power output from 10) is supplied to the hi-fi signal processor 30, and the power supplied to the mono signal processor 40 is cut off.

On the other hand, if the logic signal output from the controller 20 is a low level logic signal, a low level voltage is applied to the base of the NPN-type fourth transistor Q4 and the base of the NPN-type second transistor Q2. Q4 and the second transistor Q2 are not conductive.

Therefore, since the high level voltage is applied to the NPN-type third transistor Q3 and the NPN-type first transistor Q1, the third transistor Q3 is not conductive, and the first transistor Q1 is turned on so that the power supply unit is turned on. Power output from the 10 is supplied to the mono signal processor 40, and the power supplied to the hi-fi signal processor 30 is cut off.

As described above, the high fidelity power supply device according to the present invention supplies power only to the hi-fi signal processing unit in the hi-fi audio mode, and selectively supplies power only to the mono signal processing unit in the mono audio mode, thereby eliminating unnecessary power. It is effective to prevent consumption.

Claims (3)

A mono signal processor 40 for reproducing and processing a mono signal recorded on a magnetic tape, a hi-fi signal processor 30 for reproducing and processing a hi-fi signal recorded on the magnetic tape, and the mono signal processor 40 And a control unit 20 for controlling driving of the hi-fi signal processing unit 30 and a power supply unit 10 for supplying power to the mono signal processing unit 40 and the hi-fi signal processing unit 30. In the power supply apparatus of the pi video cassette recorder, the power supply unit 10 and the mono signal processing unit 40 is configured, and is switched under the control of the control unit 20, the output power of the power supply unit 10 A first switching unit (100) for selectively applying to the mono signal processing unit (40); It is configured between the power supply unit 10 and the hi-fi signal processing unit 30, is switched under the control of the control unit 20 to output the output power of the power supply unit 10 to the hi-fi signal processing unit 30 The power supply of the high-fidelity video cassette recorder further comprises a second switching unit for selectively applying. 2. The switch of claim 1, wherein the first switching unit (100) comprises: a second switching transistor (Q2) driven under the control of the control unit (20); It is connected between the second switching transistor Q2, the power supply unit 10 and the mono signal processing unit 40, and driven according to the driving of the second transistor Q2 to output the power supply unit 10. And a first switching transistor (Q1) for applying power to the mono signal processing section (40). The display device of claim 1, wherein the second switching unit comprises: a fourth transistor Q4 driven under the control of the control unit 20; The fourth switching transistor Q4 is connected between the power supply unit 10 and the hi-fi signal processing unit 30, and is driven in accordance with the driving of the fourth transistor Q4 to operate the power supply unit 10. And a third switching transistor (Q3) for applying output power to the hi-fi signal processing section (30).