KR19980056959A - Auxiliary audio output device at the time of no signal of television receiver - Google Patents

Abstract

The present invention relates to an auxiliary audio output device at the time of no signal of a television receiver that outputs an auxiliary audio signal such as a melody when a noise signal is output through a speaker such as a no signal signal. Automatic gain adjustment voltage generation means for generating an automatic gain adjustment voltage for amplification and IF amplification, detection means for detecting whether the automatic gain adjustment voltage is greater than or equal to a predetermined value, voice storage means for storing a predetermined voice signal, A voice output means for selectively outputting a voice signal detected from a broadcast signal and a voice signal generated by the voice storage means to a speaker according to a control signal, and the voice storage means and voice on the basis of a detection result by the detection means; It characterized in that it comprises a control means for controlling the output means.

Description

Auxiliary audio output device at the time of no signal of television receiver

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, and more particularly, to an auxiliary audio output device of a television receiver, which is configured to output an auxiliary audio signal such as a melody when a noise signal is output through a speaker such as a no signal signal.

FIG. 1 is a block diagram showing the configuration of a general television receiver. In FIG. 1, reference numeral 1 is a reception antenna, and 2 is a tuner for tuning a predetermined broadcast signal from a radio frequency (RF) signal received through this antenna. 4 denotes an IF amplifier for amplifying an intermediate frequency signal (IF signal) output from the tuner 2, 5 denotes an audio intermediate frequency signal (SIF) and an image intermediate frequency signal (outputted from the IF amplifier 4). PIF) is a P / S separation unit composed of surface elasticity and a filter for separating PIF).

In the drawing, reference numeral 6 denotes a voice detector for detecting a voice signal from the voice intermediate frequency signal SIF output from the P / S separation unit 5, and 7 denotes a voice detector for outputting from the voice detector 6. The voice signal is a voice processor which executes voice processing such as Base, Treble, Volume, etc. in accordance with a control signal from the microprocessor 16 which will be described later. 7 is an audio amplifier that amplifies the signal processed in 7) and outputs the same to the speaker 9.

In the drawing, reference numeral 10 denotes an image detector which detects an image signal from an image intermediate frequency signal PIF output from the P / S separation unit 5 and outputs a composite video signal. The image signal output from the image detector 10 processes color, tint, brightness, and the like in accordance with a control signal from the microprocessor 16 to correspond to the image signal. An image processor for outputting a hue signal of the red, G (Green), and B (Blue) signals and a luminance signal (-Y); and 12, a CRT (13) based on an RGB signal output from the image processor (11). CRT driving unit for driving the.

Reference numeral 14 denotes a remote controller for selecting a channel or volume desired by the viewer, 15 denotes a receiver which converts an infrared signal from the remote controller 14 into an electric code signal, and 16 denotes the remote controller 14. It is a microprocessor that controls the whole device in accordance with a remote control signal from the system.

That is, in the television receiver having the above-described configuration, the broadcast frequency signal transmitted from the broadcasting station is tuned by the tuner 2 and converted into a predetermined intermediate frequency signal, and the intermediate frequency signal is converted into the audio detector 6 and the video. After being detected by the detector 10, the voice processor 7 and the image processor 11 are processed to output the speaker 9 and the CRT 13.

However, in the above-described television receiver, since a broadcast signal received through an airwave transmission network is generated to generate an audio and video screen, if a noise source such as an airplane is present in the vicinity of the television receiver, the reception frequency is received. Since the noise signal is included in the noise signal, the noise signal is output through the speaker 9 or the CRT 13.

In addition, the above phenomenon is not caused only by external noise, but the same phenomenon occurs when the television receiver is turned on in a no signal state by the viewer, for example, by operating a channel up / down key to change a channel. In this case, the viewer feels great discomfort by the noise signal output to the speaker 9.

Accordingly, the present invention was created in view of the above circumstances, and when a viewer watches TV, there is a possibility that excessive noise is output to the speaker due to an external temporary jammer, etc. It is an object of the present invention to provide an auxiliary audio output device at the time of no signal of a television receiver, by outputting a guide broadcast so that a viewer can always watch a television receiver in a comfortable state.

1 is a block diagram showing a configuration of a general television receiver.

Figure 2 is a block diagram showing an auxiliary audio output device when no signal of the television receiver according to an embodiment of the present invention.

3 is an operation flowchart for explaining the operation of the device shown in FIG.

* Explanation of symbols for main parts of the drawings

1 antenna 9 speaker

13: CRT 21: AGC Circuit

22: comparator 23: switching unit

24: sound storage unit 25: digital / analog converter

26: OSD generation unit 28: microprocessor

According to the present invention for realizing the above object, the auxiliary audio output device at the time of no signal of the television receiver has automatic gain adjustment voltage generating means for generating automatic gain adjustment voltage for RF amplification and IF amplification based on the detected video signal. Detection means for detecting whether the automatic gain adjustment voltage is greater than or equal to a predetermined value, voice storage means for storing a predetermined voice signal, voice signal detected from a broadcast signal according to a control signal, and generated by the voice storage means. And a voice output means for selectively outputting a voice signal to a speaker, and a control means for controlling the voice storage means and the voice output means based on the detection result by the detection means.

According to the present invention having the above-described configuration, it is possible to prevent the noise signal from being output to the speaker due to no signal or weak signal state while watching the television receiver, thereby improving the viewing efficiency of the viewer.

Hereinafter, an embodiment according to the present invention will be described with reference to the drawings.

FIG. 2 is a block diagram illustrating an auxiliary audio output device at the time of no signal of a television receiver according to an embodiment of the present invention. In FIG. 2, the same reference numerals are given to the same parts as those of FIG.

In FIG. 2, reference numeral 21 outputs an automatic gain adjustment voltage for adjusting the RF amplification of the tuner 2 and the IF amplification of the IF amplifying unit 4 based on the level of the image signal detected by the image detecting unit 10. Auto gain control circuit (AGC: Auto Gain Control), 22, the automatic gain adjustment voltage output from the automatic gain adjustment circuit 21 is compared with a predetermined reference voltage, the automatic gain adjustment voltage rises above the reference voltage. In this case, the comparator outputs a high level detection signal, for example.

In the drawing, reference numeral 23 denotes a sound storage unit for storing a predetermined auxiliary voice, for example, a specific music or a guide voice, and 24 denotes a digital voice signal output from the sound storage unit 23 into an analog voice signal. The digital / analog converter 25 converts the output of the digital / analog converter 24 or the voice processor 7 to the voice amplifier 8 selectively by a switching signal from the microprocessor 28 which will be described later. It is a switching unit for coupling.

In addition, reference numeral 26 in the drawings is a remote control device having a plurality of operation keys for adjusting a television receiver, and in particular, a selection key for selecting an auxiliary audio output function according to the present invention. OSD generation unit for outputting RGB and OSD blanking signal (Y ') for executing subtitle guidance associated with the output of the auxiliary audio, 28 is an RGB signal output from the image processing unit 11 and the OSD generation unit 27 It is a mixer for mixing and outputting the RGB and OSD blanking signal (Y ') output.

In the drawing, reference numeral 29 denotes a microprocessor for controlling the entire apparatus.

Next, the operation of the above apparatus will be described using the operation flowchart shown in FIG.

When the television receiver is turned on (step ST1), the microprocessor 29 detects whether the channel broadcast currently tuned by the tuner 2 is in the no signal state based on whether a high level is applied to the comparator 22. (ST2 stage).

When the high level is input from the comparator 22 in the above detection state, the microprocessor 29 determines whether the auxiliary voice function is selected by the viewer (step ST3), and if so, the sound storage unit 23. ) And outputs the stored voice signal, and controls the switching unit 25 to apply the output of the digital / analog converter 24 to the voice amplifier 8 (ST4 step).

In addition, at this time, the OSD generation unit 26 is controlled to display the guide subtitle of the gist 13 that the auxiliary voice is output because it is currently in the no signal state (step ST5).

Therefore, in this state, the audio signal stored in the sound storage unit 23 is output through the speaker 9, so that the viewer does not listen to the noise signal.

On the other hand, when the low level signal is input from the comparator 22 in step ST2 or the auxiliary voice function is not selected in step ST3, the switching unit 25 is controlled to output the voice processing unit 7 to the voice amplifier unit. The normal control process applied to (8) is performed (step ST6).

Here, the selection of the auxiliary audio output function is determined by setting a predetermined flag when the viewer selects the corresponding function by operating the remote controller 26.

Therefore, according to the above embodiment, it is possible to block the noise signal output to the speaker 9 due to no signal or weak signal condition while watching the television receiver, thereby improving the viewing efficiency of the viewer.

In addition, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the technical scope of the present invention.

As described above, according to the present invention, when there is a concern that excessive noise may be output to the speaker due to an external temporary jammer or the like while the viewer watches the television, the viewer may output a specific music or a guide broadcast having a suitable volume for listening. It is possible to realize an auxiliary audio output device at the time of no signal of a television receiver, which enables a viewer to always watch a television receiver in a comfortable state.

Claims (3)

Automatic gain adjustment voltage generation means for generating an automatic gain adjustment voltage for RF amplification and IF amplification based on the detected image signal, detection means for detecting whether the automatic gain adjustment voltage is greater than or equal to a predetermined value, and a predetermined audio signal. Is stored in the voice storage means, the voice output means for selectively outputting the voice signal detected by the broadcast signal according to the control signal and the voice signal generated by the voice storage means to the speaker and the detection result by the detection means And a control means for controlling the voice storage means and the voice output means. 2. The auxiliary audio output apparatus at the time of no signal of a television receiver according to claim 1, further comprising selecting means for a user to select an auxiliary audio output function. The apparatus of claim 1, further comprising: an OSD generating means for outputting subtitle data for initially guiding the output of the auxiliary voice.