KR19990041372A - Audio signal switching device of video cassette recorder - Google Patents

Abstract

The present invention relates to an audio signal switching device of a video cassette recorder capable of selectively switching a broadcast audio signal or a reproduced audio signal of a video cassette recorder, and the broadcast audio signal through a tuner (20). A switching transistor 60 for switching the signal, a switching transistor 62 for switching the playback audio signal reproduced from the deck 30, and a switching key for switching the broadcast audio signal or the playback audio signal by the user. Each of (12) was provided so as to not only listen to the reproduced audio signal of the deck 30 in the television mode, but also to selectively listen to the broadcast audio signal of the tuner 20 in the BC mode.

That is, according to the present invention, by simply switching the playback or broadcast audio signal by using the switching key 12, the key operation can be simplified, and the audio signal can be selected and listened to according to the user's taste.

Description

Audio signal switching device of video cassette recorder

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video cassette recorder (hereinafter abbreviated as VSD), and more particularly, to an audio signal switching device of VSI for selectively outputting broadcast audio or playback audio signal.

V-Cal is a device for recording a broadcast signal input through a tuner or reading and outputting video and audio signals recorded on a video tape by magnetizing a video tape which is a magnetic material by using a head mounted on a rotating head drum.

As described above, the process of reading the signal recorded on the videotape is called 'playing back', and it is well known that the broadcast signal through the tuner is not output in the playback mode of V-Cal.

On the other hand, when V-Cal plays back, there may occur a case in which a broadcast program having a high importance, for example, breaking news, is watched as necessary by the viewer. In other words, the V-SR in the playback driving is stopped and the desired broadcast program is watched.

This mode change was cumbersome and inefficient. In other words, it is not necessary to simultaneously watch the video and audio of a broadcast program (especially news) during playback.

Accordingly, the present invention has been made in view of this point, and an object of the present invention is to provide an audio signal switching device of V-Cal for selectively outputting broadcast audio through a tuner or reproduction audio read out from a deck.

That is, the present invention provides a V-Cal audio signal switching device to which a reproduction signal from a reproduction processing system and a broadcast signal from a tuner are applied, comprising: a switching key for outputting a reproduction / broadcast audio switching key signal; A first signal separator for filtering the reproduction signal from the reproduction processing system to separate and output the reproduction audio signal among the reproduction signals; A second signal separator for filtering the broadcast signal from the tuner to separate and output the broadcast audio signal from the broadcast signal; A first switching unit connected to the first signal separator and turned off according to a predetermined control signal; A second switching unit connected to the second signal separator and turned off according to a predetermined control signal; A control unit which turns off the second switching unit in response to the reproduction audio switching key signal from the switching key, and turns off the first switching unit in response to the broadcast audio switching key signal from the switching key; And an audio signal processing unit for modulating and outputting a reproduced audio signal or a broadcast audio signal provided according to a turn-off operation of the first switching unit or the second switching unit.

1 is a block diagram of an audio signal switching device of a video cassette recorder according to the present invention;

FIG. 2 is a flowchart illustrating a process of switching a broadcast audio signal by the microcomputer of FIG. 1. FIG.

<Explanation of symbols for main parts of the drawings>

10: key input unit 12: audio signal switching key

20: Tuner 30: Deck

40: regeneration processing system 50, 52: BPF

60: first switching unit 62: second switching unit

70: audio signal processor 80: microcomputer

The above objects and various advantages of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an audio signal switching device of V-Cal according to the present invention, which includes a key input unit 10, an audio signal switching key 12, a tuner 20, a deck 30, a reproduction processing system 40, Band-pass filters (BPFs) 50 and 52, a first switching unit 60, a second switching unit 62, an audio signal processing unit 70, and a microcomputer 80, respectively.

Prior to the description of the block diagram, the video signal provided from the tuner 20 or the deck 30 is initially set regardless of the switching operation of the switching units 60 and 62 according to the present invention (TV or VR mode). And the facts will be readily apparent to those of ordinary skill in the art.

As shown, the key input unit 10 includes a plurality of function keys (not shown) for controlling the operation of the V-Cal, such as a power on / off key, and an audio signal switching key 12 different from the present embodiment. And, it is configured to apply a key signal corresponding to the key input, that is, pressed by the user to the microcomputer (80).

In addition, the audio signal switching key 12 in the key input unit 10 may be configured as a toggle switch that outputs two different voltage values as they are sequentially input, and different keys as they are sequentially pressed by the user. Outputs a signal, i.e., a reproduced audio key signal or a broadcast audio key signal.

The tuner 20 is configured to receive a broadcast signal of a channel corresponding to PLL data which is a tuning signal of the microcomputer 80 among a plurality of broadcast frequency signals transmitted from the broadcasting system based on the control signal L1 of the microcomputer 80. The received broadcast signal is output to the BPF 50.

Deck 30 includes a capstan motor and head drum for driving the video tape, and a video and audio head (not shown) for recording and reading video signals and audio signals, respectively, and control signals of the microcomputer 80. According to L2, the video and audio signals of the recording processing system (not shown) are recorded on the video tape, or the recording signals of the video tape are read and applied to the reproduction processing system 40.

The reproduction processing system 40 processes the reproduction signal read out from the video tape provided from the deck 30 by the control signal L3 of the microcomputer 80 as an outputable signal and provides it to the BPF 52.

The BPF 50 filters the video signal and the audio signal from the broadcast signal from the tuner 20, respectively, and outputs the audio signal among the broadcast signals, and the BPF 52 reproduces the processed audio signal from the reproduction processing system 40. Outputs separately.

The first switching unit 60 according to the present invention is connected to the BPF 50 to which the audio signal of the broadcast signal is output, and is selectively turned off under the control L4 of the microcomputer 80. In addition, the second switching unit 62 is connected to the BPF 52 to which the audio signal of the reproduction signal provided from the reproduction processing system 40 is output, and is selectively turned off under the control L5 of the microcomputer 80. .

The first switching unit 60 and the second switching unit 62 may use a contactless switching transistor capable of turning on and off a collector current according to the presence or absence of an input pulse. Those skilled in the art can easily know, specific description thereof has been omitted.

Meanwhile, the audio signal processor 70 modulates the audio signal provided from the BPF 50 or the BPF 52 into an outputable signal based on the control signal L6 of the microcomputer 80 and outputs it to a speaker not shown. .

The microcomputer 80 controls the above-described components, and by switching the first switching unit 60 or the second switching unit 62 (L4, L5) in response to the audio signal switching key signal according to the present invention. Control to selectively switch the broadcast audio signal and the reproduced audio signal.

Hereinafter, the process of selectively switching the broadcast or playback audio signal according to the present invention together with the above-described configuration unit will be described in detail with reference to the flowchart of FIG. 2.

Prior to the description, the flowchart has exemplified a case where an audio switching key signal for listening to a television broadcast is applied when VRC is playing back (S100). That is, the operation according to the present embodiment starts when the second switching unit 62 is turned on and the reproduction audio signal is output.

First, when the audio switching key 12 located on its own panel of the remote control or VRC is pressed by the user, the audio switching key signal is applied from the key input unit 10 to the microcomputer 80 (S102).

In response to the audio switching key signal, the microcomputer 80 outputs a control signal L5 for turning off the second switching unit 62 to the second switching unit 62 in step S104.

As the second switching unit 62 is turned off according to the control signal L5 of the microcomputer 80, the reproduction audio signal provided from the reproduction processing system 40 is cut off and input through the tuner 20. The broadcast audio signal is provided to the audio signal processor 70.

The broadcast audio signal provided to the audio signal processor 70 is output to the speaker through a predetermined modulation process according to the control signal L6 of the microcomputer 80 (S106).

Thus, the viewer can audibly hear the sound of the television while watching the image recorded on the videotape.

In addition, the present invention may switch the audio signal being reproduced in the deck 30 by turning off the above-described first switching unit 60 even in the V-TV mode. Those skilled in the art will readily know.

As described above, according to the present invention, by simply switching the reproduction or broadcast audio signal by using the switching key, not only the key operation is simplified but also the audio signal can be selected and listened to according to the user's taste.

Claims (3)

As an audio signal switching device of V-Cal to which a reproduction signal from the reproduction processing system 40 and a broadcast signal from the tuner 20 are applied, A switching key 12 for outputting a reproduction / broadcast audio switching key signal; A first signal separator (52) for filtering the reproduction signal from the reproduction processing system (40) to separately output the reproduction audio signal among the reproduction signals; A second signal separator (50) for filtering the broadcast signal from the tuner (20) to separately output the broadcast audio signal from the broadcast signal; A first switching unit 62 connected to the first signal separator 52 and turned off according to a predetermined control signal; A second switching unit 60 connected to the second signal separator 50 and turned off according to a predetermined control signal; The second switching unit 60 is turned off in response to the reproduction audio switching key signal from the switching key 12, and the first switching is performed in response to the broadcast audio switching key signal from the switching key 12. A control unit 80 for turning off the unit 62; And an audio signal processor 70 for modulating and outputting a reproduced audio signal or a broadcast audio signal provided according to the turn-off operation of the first switching unit 62 or the second switching unit 60. Seeal audio signal switch. The audio signal switching device of claim 1, wherein the switching key (12) comprises a toggle switch for outputting two different voltage values as they are sequentially pressed. The audio signal switching device of V-Cal according to claim 1, wherein the first and second switching units (62) and (60) comprise switching transistors.