KR19990042308A - Multicast receiver with multiple voice and stereo modes - Google Patents

Abstract

The present invention relates to a composite broadcast receiver capable of selecting stereo and voice multiplexing modes for an audio signal output when receiving over-the-air or cable broadcasting. To this end, the composite broadcast receiver outputs a result of determining whether the currently received audio signal is a mono mode, a stereo mode, or a voice multiple mode through an audio intermediate frequency of a received airwave or cable broadcast, An audio signal processor configured to process only an audio signal of a mode designated by a user to be output; The audio signal processor recognizes the state of the audio signal currently received by the result signal transmitted from the audio signal processor and controls the menu screen to be displayed in the form of an on-screen display message. Control unit for controlling the; And an MPEG decoder controlled by the controller to process an on-screen display message for a corresponding menu screen to be output. Therefore, it is possible to perform efficient audio signal processing according to the state of the audio signal received at the time of receiving the air wave broadcast or cable broadcast.

Description

Multicast receiver with multiple voice and stereo modes

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite broadcast receiver, and more particularly, to a composite broadcast receiver having a function of selecting a voice multiple and stereo mode for received audio.

The composite broadcasting receiver is configured to receive digital satellite broadcasting, cable (CATV) broadcasting, and over-the-air broadcasting. The proposed composite broadcasting receiver is designed mainly for digital satellite broadcasting. For this reason, in the case of audio, a selection function in the voice multiple mode is provided, but a function for selecting mono and stereo mode is not provided. This is because digital satellite audio uses stereo as the default mode.

However, cable broadcasting and over-the-air broadcasting still transmit mono and stereo sound selectively, and the receiver needs to selectively receive processing depending on whether the received audio is mono or stereo. However, as described above, the presently proposed composite broadcast receiver has a stereo mode as a basic mode, and thus, when a cable broadcast or an over-the-air broadcast is received, there is no method for selecting mono and stereo modes for audio. There is a case where the signal processing for the audio to be performed is inefficient. That is, when receiving a cable broadcast or an over-the-air broadcast, the composite broadcast receiver performs stereo sound processing on the received audio signal even though the received audio is in a mono state, so that the processing of the received audio is inefficient. Will be.

The present invention has been made to solve the above-described drawbacks, and provides a multicast receiver having a function of selecting a mono / stereo mode and a voice multimode for a received audio signal. Its purpose is to.

According to an aspect of the present invention, there is provided a composite broadcast receiver comprising: a command approving unit for applying a command of a user, the apparatus capable of receiving a composite broadcast signal through a composite tuner; If the audio selection button is controlled through the command applicator while the broadcast being received through the compound tuner is a cable broadcast or an over-the-air broadcast, the audio status of the currently received broadcast signal is checked to select between mono, stereo, and voice multiple modes. A control unit which controls a menu screen displaying a mode that is not possible to be displayed, and controls to output audio of a mode designated by a user through a command application unit with reference to the menu screen; A digital satellite broadcast decoder controlled by the control unit and outputting a corresponding menu screen as a message for on-screen display; The audio signal is controlled by the control unit to transmit the result of analyzing the intermediate frequency of the audio signal of the currently received broadcast signal to the control unit so as to grasp the audio state, and controlled by the control unit so that the audio of the user-specified mode is output. An audio signal processor configured to perform signal processing on an intermediate frequency of the audio signal processor; While set to a mode for transmitting video and audio signals of cable broadcasting or over-the-air broadcasting, it is controlled by the control unit during the generation of an on-screen display message from the digital satellite broadcasting decoder to replace the digital satellite in place of the video signal of the cable broadcasting or over-the-air broadcasting. And a switch for selecting and transmitting an on-screen display message output from the broadcast decoder.

1 is a block diagram of a multicast receiver capable of selecting multiple voice and stereo modes according to the present invention;

2 is an example of a menu screen displayed when a received audio selection mode is performed.

<Description of Symbols for Main Parts of Drawings>

100: command grant unit 110: control unit

120: Tuner 130: MPEG decoder

140: video signal processor 150: first audio signal processor

160: intermediate frequency processor 170: second audio signal processor

180: audio and video switch

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

1 is a block diagram of a composite broadcast receiver according to the present invention, which is controlled by a command applying unit 100 for applying a user's command, a controller 110 for controlling the overall functions of the receiver, and a controller 110. Digital satellite broadcasting, tuner 120 capable of tuning and demodulating all broadcast signals received via cable or airwaves, performs decoding on digital satellite broadcasting transmitted from tuner 120, and the audio selection mode according to the present invention. Video output from the MPEG decoder 130 for outputting the menu screen as a message for on-screen display, the memory 131 for storing various information necessary for MPEG decoding including basic information for forming the menu screen, and the video output from the MPEG decoder 130. Output from the video signal processing unit 140 and the MPEG decoder 130 for converting the signal into a broadcasting method set in a television set not shown. Intermediate frequency processing for the air or cable broadcasting signal output from the first audio signal processing unit 150, the tuner 120 for converting the audio signal into a form that can be output through a TV set not shown The state of the audio signal transmitted from the frequency processing unit 160 and the intermediate frequency processing unit 160 is determined and transmitted to the control unit 110 and controlled by the control unit 110 to the audio signal transmitted from the intermediate frequency processing unit 160. Video and audio signals of digital satellite broadcasting transmitted from the second audio signal processor 170, the video signal processor 140, and the first audio signal processor 150 for processing to output an audio signal of a user-specified mode. 2 The tele-video and audio signals of the air wave or cable broadcast transmitted from the audio signal processor 170 and the intermediate frequency processor 160 are not shown. It is optionally composed of video and audio switch 180 is output to a set occlusion.

The composite broadcast receiver configured as described above is operated as follows.

That is, the command applier 100 transmits a command designated by the user to the controller 110 and is configured to apply an audio selection button and a user command referring to a menu screen to be described later in order to perform the present invention. .

The controller 110 receives a tuning control signal so that a broadcast signal of a corresponding channel is received through the tuner 120 when a command is received from the command application unit 100 to receive one broadcast signal of cable, over-the-air broadcast or digital broadcast. send.

The tuner 120 is composed of a composite tuner capable of tuning for digital satellite broadcasting, airwaves (or terrestrial waves) and cable broadcasting, and tunes the corresponding broadcast channel by a tuning control signal transmitted from the controller 110, and the tuned broadcast signal. Outputs the demodulated by the demodulation method. At this time, the demodulated and output broadcast signal is transmitted to the MPEG decoder 130 in the case of digital satellite broadcasting, and to the intermediate frequency processor 160 in the case of air or cable broadcasting.

When the digital satellite broadcast signal is transmitted from the tuner 120, the MPEG decoder 130, the video signal processor 140, and the first audio signal processor 150 are driven in the same manner as in the existing digital satellite broadcast receiver, so that the corresponding video is transmitted. And transmits an audio signal to the audio and video switch 180.

At this time, the audio and video switch 180 is controlled by the controller 110 to select a signal transmitted from the video signal processor 140 and the first audio signal processor 150 to transmit to the television set not shown.

On the other hand, when the airwave or cable broadcast signal is transmitted from the tuner 120, the intermediate frequency processor 160 is driven in the same way as the existing medium frequency processor provided in the existing airwave or cable television video and audio signal of the applied broadcast signal Output Intermediate Frequency (IF). In other words, when the television set is not shown in the NTSC system, the intermediate frequency processing according to the NTSC system is performed, and the intermediate frequency processing according to the broadcasting system corresponding to the case of the PAR or other broadcasting system is performed. The intermediate frequency of the video signal output from the intermediate frequency processor 160 is transmitted to the d terminal of the audio and video switch 180, and the intermediate frequency of the audio signal is transmitted to the second audio signal processor 170.

The second audio signal processor 170 determines whether the audio signal transmitted to the intermediate frequency processor 160 is stereo, modal, or voice multiplexed, and the result of the determination is as follows. Transmission to the control unit 110 through. Table 1 is an example and may be set differently in design. That is, the conditions of digital data output to the stereo terminal and the SAP terminal may be set differently at design time.

Stereo terminal SAP terminal Contents 0 0 Mono, Negative × 0 1 Mono, negative ○ 1 0 Stereo, negative ×, 1 1 Stereo, negative ○

The controller 110 determines the state of the currently received audio signal according to the data value of the signal transmitted through the stereo terminal and the SAP terminal of the second audio signal processor 170 as shown in Table 1. That is, as shown in Table 1, if the signal transmitted through the stereo terminal and the SAP terminal of the second audio signal processor 170 is '00', the controller 110 does not have a negative audio while the currently received audio signal is mono. Recognize that you do not. Accordingly, the OSD message transmitted from the video signal processor 140 is output while the control signal is output so that the menu screen corresponding to the MPEG decoder 130 can be output as an On Screen Display (OSD) message. The switching state of the audio and video switch 180 is controlled to be transmitted.

The MPEG decoder 130 reads basic information of a menu screen stored in the memory 131 and decodes the basic information of the menu screen to be output as an OSD message and transmits the decoded information to the video signal processor 140. At this time, the output OSD message is displayed in a state in which the user selectable mode and the non-selectable mode are displayed. The display of the selectable mode and the non-selectable mode is performed by a control signal transmitted from the controller 110. Therefore, as described above, the menu screen displayed in the case of mono and no sub-audio is shown in FIG. 2A.

Referring to the menu screen illustrated in FIG. 2A, the user recognizes that only the mono mode is present in the sound mode that can be currently selected. Accordingly, when the user selects the mono mode through the command applier 100, the controller 110 controls the operation of the second audio signal processor 170 to output the audio signal in the mono mode and simultaneously switches the audio and video switches. The controller 180 selects and transmits a signal output from the second audio signal processor 170 and the intermediate frequency processor 160.

The second audio signal processor 170 includes an audio signal transmission path according to the mono mode, the stereo mode, and the SAP mode, respectively, for the audio signal transmitted from the intermediate frequency processor 160, and is selected by the controller 110. Only the audio signal transmitted through the audio and video switch 180 is transmitted.

If the signal transmitted through the stereo terminal and the SAP terminal of the second audio signal processor 170 is '01', the controller 110 recognizes that the audio signal of the currently received broadcast signal is mono and has a negative voice. The MPEG decoder 130 is controlled to display a menu screen as shown in FIG. 2B. Accordingly, the MPEG decoder 130 is driven as in the case where only the above-described mono mode can be selected, and outputs an OSD message for the menu screen to the video signal processor 140.

The user recognizes that the audio signal currently received through the menu screen displayed as shown in FIG. 2B is mono and has a negative sound, and selects a desired mode through the command applier 100 to output the control unit. 110 controls the operation of the second audio signal processor 170 to output an audio signal of a form selected by the user.

If the signal transmitted from the second audio signal processor 170 is '10', the controller 110 recognizes that the audio signal of the currently received broadcast signal is stereo and does not have negative voice, and as shown in FIG. 2C. The MPEG decoder 130 is controlled to display the same menu screen. If the signal transmitted from the second audio signal processor 170 is '11', the controller 110 recognizes that the audio signal of the currently received broadcast signal is stereo and has negative sound, as shown in FIG. 2D. The MPEG decoder 130 is controlled to display a menu screen. The MPEG decoder 130 is driven in the same manner as described above, and the operation of the control unit 110 according to the user command applied through the command application unit 100 with reference to the displayed menu screen is also performed as described above.

As described above, the present invention provides a situation in which a composite broadcast receiver can select a situation by selecting whether a state of an audio signal received when receiving a cable broadcast or an over-the-air broadcast is mono, stereo, or sub-audio. By displaying it in the display, and allowing the user to select the state of the audio signal to be output through the displayed menu screen, there is an effect that can efficiently process the audio signal according to the received audio signal.

Claims (2)

In the device that can receive a composite broadcast signal through a composite tuner, A command approving unit for approving a user command; If the audio selection button is controlled through the command application unit while the broadcast being received through the composite tuner is a cable broadcast or an airwave broadcast, the audio state of the currently received broadcast signal can be checked to select among mono, stereo, and voice multiplexing modes. A controller which controls a menu screen displaying a mode and a mode not available to be displayed, and controls to output audio of a mode designated by a user through the command application unit with reference to the menu screen; A digital satellite broadcast decoder controlled by the controller to output a corresponding menu screen as a message for on-screen display; The result of analyzing the intermediate frequency of the audio signal of the currently received broadcast signal controlled by the control unit is transmitted to the control unit so as to determine the audio state, and controlled by the control unit to control the audio of the user-specified mode. An audio signal processor configured to perform signal processing on an intermediate frequency of the audio signal to be output; In the state of transmitting the video and audio signals of the cable or over-the-air broadcast, the on-screen display message is generated from the digital satellite broadcast decoder and controlled by the controller to control the cable or over-the-air broadcast. And a switch for selecting and transmitting an on-screen display message output from the digital satellite broadcasting decoder instead of a video signal. 2. The audio multiplex and stereo mode of claim 1, wherein the audio signal processor comprises an audio transmission path of a mono mode, a stereo mode, and a voice multiple mode (SAP) with respect to an intermediate frequency of the audio signal. Selectable multicast receiver.