KR960004512B1 - Character display method of sound multiplex system - Google Patents

Abstract

a) distinguishing audio and video signals; b) processing characters with on screen display(OSD) mode in case that video signals are detected from the first step; c) checking 728 bit frame in case that audio signals are detected from the first step; d) processing characters with OSD mode after processing background sound in case that 728 bit frame is not applicable; and e) processing characters with OSD mode after separating. The near instantaneous compand audio multiplex(NICAM) I and II signal in case that 728 bit frame is applicable.

Description

Character Display Method of Voice Multiple Broadcasting System

1 is a block diagram of an apparatus for performing a text display method of a voice multiple broadcast system according to the present invention.

2 is a flowchart of a character display method according to the present invention.

* Explanation of symbols for main parts of the drawings

1 antenna 2 audio amplifier

3: QPSK Part 4: Decoder

5: automatic gain control unit 6: digital processing unit

7: Mixer 8: Microcomputer

9: OSD unit 10: selector

11: speaker 12: monitor

13: video amplifier 14: Y / C separator

15: synchronous separator

The present invention relates to a text display method for recognizing a voice multicast system in progress in a voice multicast system.

In general, the voice multiple broadcast system is different from each country implementation method, it is necessary to make the voice multiple broadcast system in progress to the user.

Accordingly, an object of the present invention is to provide a text display method of a voice multiple broadcast system capable of recognizing an ongoing voice multiple broadcast system using a character in a voice multiple broadcast system.

In order to achieve the above object, the present invention provides a first step of searching for an audio signal or a video signal when an IF signal is input; A second step of OSD processing, a third step of searching whether the result of the search result audio signal is a 728-bit frame if the search result is an audio signal, and a background sound if the search result of the third step does not result in a 728-bit frame. After processing, OSD process the designated character according to the mode, and if the result of the search in the third step is 728 bit frame, process it by dividing it into NICAM-I, II signal and OSD process the designated character according to the mode. There is provided a text display method of a voice multiple broadcasting system having a fifth step.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is a block diagram of an apparatus for performing a character recognition method according to the present invention.

As shown in FIG. 1, the apparatus to which the present invention is applied includes an antenna 1, an automatic gain control unit 5, an audio amplifier unit 2, a quadrature phase shift keying unit (QPSK) unit 3, and a decoder ( 4), digital processor 6, mixer 7, microcomputer 8 OSD (On Screen Display) OSD (9), selector (10), speaker (11), monitor (12), video amplifier (13) , A YIC separator 14 and a synchronous separator 15.

In the above configuration, the audio amplifier 2 and the video amplifier 13 amplify the signal and the video signal input from the external antenna 1 under the control of the automatic gain controller 5.

In addition, the automatic gain control unit 5 automatically adjusts the gain for amplifying the audio signal and the video signal under the control of the microcomputer 8.

Meanwhile, the SIF (Sound Intermediate Frequen cy) signal amplified by the audio amplifier 2 is QPSK processed by the QPSK unit 3 and then decoded by the decoder 4.

Therefore, when an audio frequency signal output from the decoder 4 is input to the digital processing unit 6, the digital processing unit 6 recognizes a bit contained in the digital signal and performs a NICAM-I (Near Instantaneous Compand Audio). Multiplex-I) and NICAM-II (Near Instantaneous Compand Audio Multiplex-II) signals are determined.

On the other hand, the mixer 7 mixes a phase alternation by line (PAL) -B / G signal without a digital signal output from the decoder 4 and a signal output from the digital processing unit 6 to the selector 10. Output

The selector 10 selects and outputs an audio signal output from the mixer 7 among the left and right speakers 11.

In addition, the OSD unit 9 corresponds to each mode by using signals input from the digital processing unit 6, the mixer 7, the video amplifier 13, the synchronous separator 15, and the microcomputer 8. Creates the specified character and outputs it to the monitor 12.

Meanwhile, the Y / C separator 14 separates the signal output from the video amplifier 13 into a Y / C signal, and the sync separator 15 synchronizes the signal input from the Y / C separator 14. Isolate.

On the other hand, the microcomputer 8 keeps the clock and data necessary in the process of determining the NICAM-I and II signals of the digital processing unit 6 constantly, and the clock, data and clock for operating the OSD unit 9. The set signal is output to the OSD 9, the synchronous signal input from the synchronous separator 15 is sensed and controlled, and the automatic gain control unit 5 is controlled.

2 shows a flowchart of a character display method according to the present invention.

As can be seen from the figure, if an IF signal is input, the video signal is divided into an audio signal (20), and if it is a video signal to control the automatic gain control unit (5) for controlling the video amplifier (13) The signal is amplified (31), the Y / C signal is detected, and then synchronously separated (32, 33), and a designated character corresponding to each mode is generated and OSD processed (29).

If the input II signal is an audio signal, the automatic gain control unit 5 controlling the audio amplifier 2 is amplified (21), QPSK processed (22), and decoded (23), Search for a 728-bit frame (24).

If the result of the search in step 24 is not 728 frames, the background sound processing is performed (30), and output to the speaker, and the designated character according to the mode is created and OSD processing (29).

On the other hand, if the result of the search in step 24 is a 728-bit frame, the filter is filtered through a 5.5 MHz filter and a 6.0 MHz filter (25), and then scanned for the presence of a 5.5 MHz component (26). If it is (27), it processes the NICAM-I signal (28), outputs it to the speaker, and processes the OSD with the designated character according to the corresponding mode (29).

As described above, according to the present invention, the user is informed of the voice multicasting system currently in progress by using text, thereby providing convenience to the user.

Claims (4)

A first step of searching for an audio signal or a video signal when an IF signal is input; A second step of OSD processing the designated character according to the corresponding mode after performing the processing according to the search result video signal in the first step; A third step of searching for whether or not the result is a 728-bit frame if the search result is an audio signal in the first step; A fourth step of OSD processing the designated character according to the mode after processing the background sound if the 728-bit frame is not found in the third step; And a fifth step of separating and processing the NICAM-I and II signals when the search result is the 728-bit frame in the third step, and OSD processing the designated text according to the corresponding mode. 2. The method of claim 1, wherein the second step comprises amplifying an input video signal 31, detecting a Y / I signal 32, synchronizing the OSD and processing specified characters according to the corresponding mode. Character display method of the voice multiple broadcasting system, characterized in that further comprises the steps (33, 29). The method of claim 1, wherein the third step comprises amplifying an input audio signal (21), QPSK processing (22), and decoding (23, 24) whether or not a 728 bit frame is obtained. Character display method of the multiplex voice system, characterized in that further consisting of). The method of claim 1, wherein the fifth step includes filtering (25,26) if there is a 5.5MHz component and NICAM-I signal processing (28) if there is a 5.5MHz component and 5.5 If there is no MHz component, the step of processing the NICAM-II signal (27), and the OSD processing step 29 of the specified character according to the mode after the NICAM-I, II signal processing further comprises Character display method.