KR19990041631U - Audio signal automatic selection device according to the transmission method of the multi-view TV receiver - Google Patents

Abstract

The present invention relates to an apparatus for automatically selecting an audio signal according to a transmission method of a multiplex television receiver for receiving, comprising: an intermediate frequency generator for generating an intermediate frequency for outputting an audio signal from an image and an audio intermediate frequency of a selected channel; A plurality of band pass filters for passing only the intermediate frequencies of the corresponding transmission schemes according to a plurality of transmission schemes through the intermediate frequencies output from the intermediate frequency generator; A DC level generator corresponding to the plurality of band pass filters to generate a DC level from an intermediate frequency output from the band pass filter; A switching circuit switched according to the DC level output from the DC level generator to select an output of the band pass filter; And a voice signal detector for outputting a voice signal from an intermediate frequency output from the band pass filter selected by the switching circuit, so that the viewer can automatically select the voice signal according to the transmission method of the broadcast signal received without any operation. It can be effective.

Description

Audio signal automatic selection device according to the transmission method of the television receiver for multiple broadcasting method

The present invention relates to a television receiver for multi-broadcast reception, and more particularly, to automatic selection of a voice signal according to a transmission method in a multi-broadcast reception television receiver.

Television transmission methods are classified into SYSTEM M, B / G, D / K, I, L, etc. according to the synchronization signal characteristics by CCIR REPORT, and NTSC, PAL, SECAM, etc. according to the color method. Therefore, in various countries in the world, television broadcasting is carried out by a combination of the television transmission system and the color system. For example, NTSC-M broadcasting is adopted in the United States, Japan, and Korea, and PAL-B / G broadcasting is adopted in Western Europe such as Germany, Spain, and Italy, and PAL-D / in China and Romania. K broadcast system is adopted.

FIG. 1 illustrates a conventional apparatus for selecting a voice signal according to a transmission method in a multi-broadcast reception television capable of receiving at least two broadcast methods.

The voice signal selecting apparatus according to the conventional transmission method shown in FIG. 1 includes a tuner 100, an intermediate frequency generator 102, a switching circuit 104, a band pass filter 106, a buffer 108, and a voice signal detector. 110, an operation unit 114, and a microprocessor 112.

The tuner 100 receives a broadcast signal of a channel selected from the broadcast signals received through the antenna.

The intermediate frequency generator 102 generates a frequency corresponding to a difference between the intermediate frequency of the video signal and the intermediate frequency of the audio signal from the broadcast signal of the channel selected by the tuner 100.

The switching circuit 104 selects a band pass filter to which the intermediate frequency signal output from the intermediate frequency generator 102 is input under the control of the microprocessor 112. Here, the microprocessor 112 may switch the switching circuit 104 to output the intermediate frequency to the band pass filter corresponding to the transmission scheme selected by the user by the operation unit 114 such as a remote control device or a button. To control.

The bandpass filter 106 includes at least two bandpass filters 106a and 106b. Here, the band pass filters are a plurality of band pass filters for passing only the intermediate frequency corresponding to the transmission scheme of the television broadcast signal.

The buffer 108 stores the intermediate frequency output from the bandpass filter 106.

The voice signal detector 110 detects and outputs a voice signal from an intermediate frequency signal stored in the buffer 106.

In the conventional audio signal selecting apparatus according to the transmission method of the multi-broadcast reception television broadcast signal configured as described above, the user has to select a corresponding bandpass filter according to the transmission method of the tuned broadcast signal.

The present invention was created to solve the above-mentioned problems, and detects a DC level from a bandpassed intermediate frequency, and automatically selects an audio signal according to a transmission method of a multi-view TV receiver according to the detected DC level. In providing.

Fig. 1 is a block diagram of a conventional audio signal automatic selection apparatus of a television receiver for multi-broadcast reception.

2 is a block diagram illustrating a configuration of an automatic audio signal selection apparatus of a television receiver for receiving a multiple broadcasting method according to the present invention.

FIG. 3 is a detailed block diagram of the DC level generator shown in FIG. 2.

4 is a circuit diagram illustrating an example of the switching circuit shown in FIG. 2.

FIG. 5 is a circuit diagram illustrating an example of the amplifier illustrated in FIG. 3.

FIG. 6 is a circuit diagram illustrating an example of the half-wave rectification and smoothing circuit shown in FIG. 3.

In accordance with the present invention for achieving the above object, in the multi-channel receiving television receiver, the automatic signal selection apparatus according to the transmission method

An intermediate frequency generator for generating an intermediate frequency for outputting an audio signal from the image and audio intermediate frequencies of the selected channel; A plurality of band pass filters for passing only the intermediate frequencies of the corresponding transmission schemes according to a plurality of transmission schemes through the intermediate frequencies output from the intermediate frequency generator; A DC level generator corresponding to the plurality of band pass filters to generate a DC level from an intermediate frequency output from the band pass filter; A switching circuit switched according to the DC level output from the DC level generator to select an output of the band pass filter; And a voice signal detector for outputting a voice signal from an intermediate frequency output from the band pass filter selected by the switching circuit.

The DC level generating unit includes an amplifier for amplifying a band pass intermediate frequency level to a predetermined level, and a half wave rectification and smoothing circuit for half-wave rectifying and smoothing the amplified intermediate frequency signal to a DC level.

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

2 is a block diagram illustrating a configuration of a voice signal automatic selection apparatus according to a transmission method of a multi-view television receiver according to the present invention.

2 is a tuner 200, an intermediate frequency generator 202, a band pass filter 204, a switching circuit 206, a buffer 208, and a voice signal detector (2). 210 and a DC level generator 212.

The tuner 200 outputs a broadcast signal of a channel selected from the broadcast signals received through the antenna.

The intermediate frequency generator 202 generates an intermediate frequency for detecting an audio signal from the broadcast signal output from the tuner 200. That is, the intermediate frequency generator 102 receives the intermediate frequency of the video signal and the intermediate frequency of the audio signal. In this case, the intermediate frequency generator 102 generates a frequency corresponding to the difference between the intermediate frequencies. As an example thereof, in the case of the B / Z method, since the image intermediate frequency (PIF) is 38.9 MHz and the audio intermediate frequency (SIF) is 33.4 MHz, the intermediate frequency generating unit 202 generates the image intermediate frequency and the audio intermediate frequency. Will generate 5.5MHz. In addition, in the case of the M method, since the image intermediate frequency (PIF) is 38.9 MHz and the audio intermediate frequency (SIF) is 34.4 MHz, the intermediate frequency generator 202 determines the difference between the image intermediate frequency and the audio intermediate frequency, 4.5 MHz. Will generate The intermediate frequency obtained in this way is 6 MHz for the I scheme and 6.5 MHz for the D / K scheme.

The bandpass filter 204 includes a plurality of bandpass filters 204a and 204b. Here, the plurality of band pass filters are filters for passing only the intermediate frequency corresponding to each transmission scheme (M, B / Z, I, D / K). In the exemplary embodiment of the present invention, since only the M and B / Z transmission methods are described, two band pass filters are provided. This bandpass filter has as many transmission schemes as the television receiver can receive.

The switching circuit 104 selects an output of the bandpass filter related to the transmission method currently being received from the plurality of bandpass filters according to the DC level of the DC level generator 212 and outputs the output to the buffer 208.

The DC level generator 212 includes a plurality of DC level generators 212a and 212a corresponding to the band pass filters, and the plurality of DC level generators output an intermediate frequency signal output from the plurality of band pass filters. To generate each DC level accordingly. At this time, of the plurality of DC level generators, only the DC level generator suitable for the received transmission scheme outputs the high level DC level, and the other DC level generators output the low level DC level. Therefore, only the output of the bandpass filter corresponding to the high level DC level is selected by the switching circuit 104, and the selected intermediate frequency signal is stored in the buffer 208.

The voice signal detector 210 detects and outputs a voice signal from an intermediate frequency stored in the buffer 208.

FIG. 3 is a detailed block diagram of the DC level generating unit shown in FIG. 2, and half-wave rectifies a signal of an amplified intermediate frequency and an amplifier 300 that amplifies a band pass intermediate frequency level to a predetermined level and smoothes the DC level. The half wave rectification and smoothing circuit 302 is provided. That is, since the level of the band-passed voice signal is a weak signal of 100m Vrms level, it is necessary to amplify the voice signal so that the half DC rectification and smoothing circuit can make the intermediate DC level required by the switching circuit. 5 is an example of an amplifier, and the amplifier amplifies a band pass frequency signal to a predetermined level. In addition, the circuit shown in FIG. 6 is an example of a half-wave rectification and smoothing circuit, and the half-wave rectification and smoothing circuit smoothes the audio signal amplified by the amplifier to a DC level capable of driving the switching circuit. Therefore, the DC level output by this half-wave rectification and smoothing circuit is input to the gate terminal of the transistor of the switching circuit shown in Fig. 4. If this DC level is high level, the output of the corresponding bandpass filter is applied. If it is shorted to output to the buffer and the DC level is low level, the output of the band pass filter corresponding thereto is opened so as not to be output to the buffer.

As described above, according to the present invention, the audio signal automatic selection apparatus according to the transmission method of the multi-view TV receiver for receiving, the viewer automatically selects the audio signal according to the transmission method of the broadcast signal received without additional operation It provides a possible effect.

Claims (2)

In a television receiver for receiving a multiple broadcast method, An intermediate frequency generator for generating an intermediate frequency for outputting an audio signal from the image and audio intermediate frequencies of the selected channel; A plurality of band pass filters for passing only the intermediate frequencies of the corresponding transmission schemes according to a plurality of transmission schemes through the intermediate frequencies output from the intermediate frequency generator; A DC level generator corresponding to the plurality of band pass filters to generate a DC level from an intermediate frequency output from the band pass filter; A switching circuit switched according to the DC level output from the DC level generator to select an output of the band pass filter; And And a voice signal detector for outputting a voice signal from an intermediate frequency output from the band pass filter selected by the switching circuit. The method of claim 1, wherein the DC level generating unit An audio signal according to a transmission method comprising an amplifier for amplifying a band pass intermediate frequency level to a predetermined level, and a half wave rectification and smoothing circuit for half-wave rectifying and smoothing the amplified intermediate frequency signal to a DC level. Auto selector.