KR100447772B1 - Apparatus for converting channels for digital tv of code division multiplex - Google Patents

Abstract

The present invention relates to a channel-switching device for code division multiplex digital TV, and more particularly, to a channel-switching device for code division multiplexing digital TV so as to minimize the time required for channel switching. . SUMMARY OF THE INVENTION An object of the present invention is to employ a plurality of broadcast information processing units and buffers, and then output video and audio data of a buffer corresponding to a changed channel when a channel is changed. Provides a channel switching device, by outputting the video and audio data stored in the buffer during the processing time of the video and audio data received through the changed channel during the channel switching, it can be made quickly during channel switching to further improve the convenience of the product. Get an effect.

Description

Channel division apparatus of digital TV of code division multiple system {APPARATUS FOR CONVERTING CHANNELS FOR DIGITAL TV OF CODE DIVISION MULTIPLEX}

The present invention relates to a channel switching device for code division multiplex digital TVs, and more particularly, to a channel switching device for code division multiplexing digital TVs to minimize the time required for channel switching.

As shown in FIG. 1, the digital TV of the general code division multiplexing method includes an antenna 101A, 101B, a tuner 102A, 102B, a code division multiple demodulation unit 103, a broadcast information processing unit 104, and a pilot. The information processing unit 105, the buffer 106, the control unit 107, the channel information processing unit 108, and the key input unit 109.

When the user selects a channel to watch after the user turns on the digital TV by using a key button of the remote controller, which is the key input unit 109, the controller 107 controls the tuner 102A and 102B. The control unit selects and outputs only the broadcast signal of the input channel among the broadcast signals received through the antennas 101A and 101B. Thereafter, the code division multiple demodulation unit 103 classifies the selected broadcast broadcast signal into broadcast information, which is video and audio data, channel information, which is channel data, and pilot information, which is additional data, for each bit, and receives channel information. The processing unit 108 outputs the Walsh code of the channel information, and the pilot information processing unit 105 having received the pilot information decodes and outputs the additional data.

In addition, the control unit 107 includes the decoded pilot information of the pilot information processing unit 105, the Walsh code of the channel information processing unit 108, and key data corresponding to the channel selection button of the key input unit 109 according to a user's selection. Is applied. The controller 107 outputs a control signal for controlling to process broadcast information of a channel selected according to the pilot information, Walsh code, and key data among the broadcast signals received through the tuners 102A and 102B. The control signal is provided to the code division multiple demodulator 103.

The code division multiple demodulation unit 103 receiving the control signal of the control unit 107 outputs broadcast information of the selected channel to the broadcast information processing unit 104, and receives the outputted broadcast information. Decodes the broadcast information. The decoded video and audio data are temporarily stored in the buffer 106 and then output through the display device and the speaker.

Here, the broadcast signal received through the tuners 102A and 102B is demodulated by the code division multiple demodulation unit 103. After decoding the demodulated broadcast information into video data and audio data, it is descrambled. Since the processing of the scrambling broadcast information processing unit 104, the pilot information processing unit 105 processing the pilot information, and the buffer 106 is already well known, detailed descriptions thereof will be omitted.

In the conventional code division multiplex digital TV as described above, the broadcast information processing unit 104 and the pilot information processing unit 105 are provided to process only the broadcast signal that is being broadcasted, and the user can use the key input unit 109 to When the channel is changed, the broadcast information of the changed channel must be processed, so that video and audio data of the buffer 106, which is channel information of the previous channel, is displayed on the screen during this time. That is, since the channel switching time takes time to process the received broadcast information of the changed channel, there is a problem that makes the user feel bored during this time.

Accordingly, the present invention was created to solve the above problems, and the present invention employs a plurality of broadcast information processing units and buffers to process and store broadcast information of all tunable channels, and then stores video and audio signals when the channel is changed. The purpose of the present invention is to provide a channel division apparatus of digital TV of code division multiplexing which can reduce channel switching time to a minimum.

The present invention for achieving the above object,

In the code division multiplex digital TV which receives a scrambled digital satellite broadcast signal and demultiplexes and decodes and outputs audio and video data,

A code division multiple demodulator for demodulating broadcast signals of all tunable channels received through a plurality of tuners to output channel information as Walsh codes, broadcast information as video and audio data, and pilot information as additional data;

A channel information processor to decode channel information of the code division multiple demodulator and output a Walsh code as channel data;

A pilot information processor for decoding and processing pilot information of the code division multiple demodulator;

Receiving the pilot information of the pilot information processing unit generates a clock signal for synchronizing the system of the digital TV, the Walsh code of the channel information processing unit, the pilot information of the pilot information processing unit, the clock signal, and the key signal of the key input unit A controller configured to generate a Walsh code assignment signal for allocating the Walsh code as the channel data and provide the same to the code division multiple demodulator;

A plurality of broadcast information processing units for processing video information output from the code division multiple demodulator and outputting video data and audio data according to Walsh code allocation signals of the control unit among all tunable channels;

A plurality of buffers for storing respective audio and video data output from the plurality of broadcast information processing units; And

The switching unit is switched when the channel is changed according to the selection of the key input unit, characterized in that the switching control unit for outputting audio and video data of the buffer corresponding to the changed channel of the plurality of buffer unit.

Preferably the code division multiple demodulator,

A plurality of delayers each delaying each broadcast signal provided from the plurality of tuners for a predetermined time;

A plurality of dispensers for outputting the output signals of the plurality of delayers and the broadcast signals provided from the plurality of tuners according to Walsh code assignment signals and clock signals output from the controller; And

And a combiner configured to demodulate the output signals of the plurality of dispensers according to the output signal of the filter and the path searcher correcting the phase change of the broadcast signal provided from the plurality of tuners.

According to the present invention, by processing the periodic broadcast signal and the delayed broadcast signal for each of the tunable channels, respectively, and storing the audio and video data, and outputting the audio and video data of the changed channel when switching the channel, The time can be reduced to a minimum, thereby further improving the convenience of the product.

1 is a diagram showing the configuration of a digital TV of a general code division multiplexing method.

2 is a view showing the configuration of a channel switching apparatus for digital TV according to the present invention.

3 is a view showing in detail the configuration of the demodulator of FIG.

<Explanation of symbols for main parts of drawing>

201, 203: first and second tuners 210: code division multiple demodulator

211 and 213: first and second delayers 215 and 216: first and second dispersers

217: filter and path search unit 219: coupling unit

220: channel information processing unit 230: control unit

250-25n: first to n-th broadcast information processing unit 270: pilot information processing unit

280: key input unit 290-29n: first to n-th buffer

310: switching unit 330: switching control unit

Hereinafter, the present invention will be described in more detail with reference to the following examples.

FIG. 2 is a diagram illustrating a code division multiplex digital TV channel switching apparatus according to the present invention. As shown in the present invention, an embodiment of the present invention is provided to process broadcast signals provided from two satellites. That is, the broadcast signals provided from the first and second tuners 201 and 203 are demodulated by a code division multiplexing (CDM) scheme, thereby providing channel information as Walsh codes, broadcast information as video and audio data, and addition. A code division multiple demodulator 210 for outputting pilot data which is data, a channel information processing unit 220 for decoding a channel information of the code division multiple demodulator 210 and outputting a spread Walsh code W, and the code A pilot information processor 270 that decodes and processes pilot information of the partitioned multiple demodulator 210, and receives a pilot information P of the pilot information processor 270, and a clock signal for synchronizing the digital TV system ( SYNC), the disparity Walsh code W of the channel information processing unit 220, the clock signal SYNC, the pilot information P of the pilot information processing unit 270, and the key of the key input unit 280. Signal (K Generate a Walsh code assignment signal (W1-Wn) for allocating Walsh codes to the broadcast signals of all tunable channels, and transmit the Walsh code assignment signals (W1-Wn) to the code division multiple demodulator (210). It includes a control unit 230 to provide.

In addition, the digital TV of the code division multiplexing method according to the present invention is a channel of each channel received by the code division multiple demodulator 210 according to the Walsh code assignment signals W1-Wn of the control unit 230 among all tunable channels. A plurality of broadcast information processing units 250-25n for receiving and processing broadcast information to output video data and audio data, and a plurality of storing respective audio and video data output from the plurality of broadcast information processing units 250-25n. A buffer corresponding to the changed channel among the plurality of buffer units 290-29n by switching the switching unit 310 when the channel is changed according to the selection of the buffer unit 290-29n and the key input unit 280. The switching control unit 330 further outputs audio and video data.

Here, the number of the plurality of broadcast information processing units 250-25n, the buffer units 290-29n, and the Walsh code assignment signals W0-Wn correspond to the number of all tunable channels, and the Walsh code assignment signals (W1-Wn) represents all tunable channels. For example, when the Walsh code allocation signal is 'W1', the code division multiple demodulator 210 first broadcasts KBS 1 channel broadcast information so that the broadcast information of KBS 1 channel is processed by the first broadcast information processor 250. It supplies to the information processing part 250. In addition, when the Walsh code allocation signal is 'W2', the code division multiple demodulator 210 processes the MBC channel broadcast information so that the broadcast information of the MBC channel is processed by the second broadcast information processor 250. 251). The first and second broadcast information processing units 250 and 251 receiving the broadcast information decode the received broadcast information and process the same.

Here, the code division multiple demodulator 210 may include first and second delayers 211 and 213 for delaying respective broadcast signals provided from the first and second tuners 201 and 203, respectively, for a predetermined time. And output signals of the first and second delayers 211 and 213 and broadcast signals provided from the first and second tuners 201 and 203 (including channel information, broadcast information, and pilot information). First and second dispensers 215 and 216 for receiving and despreading according to the Walsh code assignment signals W1-Wn and the clock signal SYNC of the controller 230. Outputs of the first and second dispensers 215 and 216 in accordance with the output signal of the filter and the path searcher 217 for correcting the broadcast information provided from the second tuners 201 and 203 with respect to the phase change. And a combiner 219 for demodulating the signals.

In addition, the first to n-th broadcast information processor 250-25n, the pilot information processor 270, the first to n-th buffers 290 to 29n, the first delay unit 211, and the second delay unit 213. ), The first to second display devices 215 and 216, the filter and the path processor 217 are the same as the detailed configuration and description of the digital TV of the conventional code division multiplexing method, and thus the detailed description thereof will be omitted.

In the code division multiplex digital TV according to the present invention provided as described above, first, when the digital TV is turned on by using a power key of the key input unit 280, broadcast information provided from a satellite is received through an antenna. do.

The broadcast information of the channel received through the antenna is received and amplified through the first tuner 201 and the second tuner 203 for diversity and then adjusts the channel gain.

Thereafter, broadcast information of the first tuner 201 and the second tuner 203 is supplied to the first delayer 211 and the second delayer 213 of the code division multiple demodulator 210, respectively, and the first delay is performed. The delay unit 211 and the second delay unit 213 output delay adjustments for signal synchronization between respective tuners. It is supplied to the first and second dispensers 215 and 216 which receive the broadcast signal delayed from the diversity signal to disperse the broadcast signal, and provides the disparity broadcast signal to the combiner 219. .

At this time, the broadcast signal output from the first tuner 201 and the second tutor 203 is demodulated and output according to the output signal of the filter and the path search unit 217 for correcting the phase change. Here, the broadcast signal is separated into individual bits into channel information, broadcast information, and pilot information.

The pilot information demodulated by the code division multiple demodulator 210 is provided to the pilot information processor 270, and the pilot information P decoded by the pilot information processor 270 is provided to the controller 230. In addition, the channel information demodulated by the code division multiple demodulator 210 is supplied to the channel information processing unit 220 to analyze the Walsh code, which is channel information, and the analysis result is provided to the control unit 230.

Herein, the control unit 230 may be configured to display the displural Walsh code W of the channel information processing unit 220, the pilot information P of the pilot information processing unit 270, and the key signal K of the selected key input unit 280. ) To generate Walsh code assignment signals W1-Wn to broadcast signals of all channels received by the code division multiple demodulator 21, and to tune all digital TV systems according to the pilot information (P). Generates a clock signal SYNC.

The code division multiple demodulator 210 receives the Walsh code assignment signals W1-Wn in response to the broadcast signals of all the channels and outputs the broadcast signals of all channels receivable according to the Walsh code assignment signals W1-Wn.

The broadcast information output from the code division multiple demodulator 210 according to the Walsh code assignment signals W1-Wn is provided to a corresponding broadcast information processing unit of the first to nth broadcast information processing units 250-250n. The broadcast information processing unit selected from the first to nth broadcast information processing units 250 to 250n decodes and processes the input broadcast information.

For example, according to the spread Walsh code (W), clock information (SYNC), pilot information (P), and the key signal (K) of the key input unit 220 selected by the user, the control unit 230 is KBS The code division multiple demodulator 210 outputs a first Walsh code assignment signal W1 for processing broadcast information of 1 in the first broadcast information processing unit 250 and receives the first Walsh code assignment signal W1. Provides broadcast information of the KBS 1 channel to the first broadcast information processing unit 250 according to the first Walsh code assignment signal W1.

The first broadcast information processor 250 processes the broadcast information received through the KBS1 channel and outputs video and audio data.

Broadcast information of all tunable channels processed by the first broadcast information processing unit 250 to n-th broadcast information processing unit 250n is processed to output audio and video data of broadcast information of each channel.

The audio and video data is supplied to and stored in each of the first to nth buffers 290 to 290n.

On the other hand, when the channel is switched by the user using the key button of the key input unit 280, the audio and video data of the buffer in which the audio and video data of the changed channel among the first to nth buffers 290 to 29n are stored is output. The control signal for outputting is output from the switching controller 330, and the switching unit 310 receiving the control signal of the switching controller 330 switches to output audio and video data of a buffer in which the audio and video data of the changed channel is stored. do.

As described above, the code division multiplexing digital TV according to the present invention processes broadcast signals for each of the tunable channels, respectively, and stores audio and video data, and then outputs the stored audio and video data when switching channels. By doing so, the time required for channel switching can be reduced to a minimum, thereby further improving the convenience of the product.

In addition, although the present invention has been described in detail with reference to the embodiments described above, the present invention is not limited thereto, and modifications and improvements are possible within the scope of ordinary knowledge of those skilled in the art.

Claims (2)

In the code division multiplexing digital TV which receives scrambled digital satellite broadcasting signal and demultiplexes and demodulates it to output audio and video data, A code division multiple demodulator for demodulating broadcast signals of all tunable channels received through a plurality of tuners to output channel information as Walsh codes, broadcast information as video and audio data, and pilot information as additional data; A channel information processor to decode channel information of the code division multiple demodulator and output a Walsh code as channel data; A pilot information processor for decoding and processing pilot information of the code division multiple demodulator; Receiving the pilot information of the pilot information processing unit generates a clock signal for synchronizing the system of the digital TV, the Walsh code of the channel information processing unit, the pilot information of the pilot information processing unit, the clock signal, and the key signal of the key input unit A controller configured to generate a Walsh code assignment signal for allocating a Walsh code as the channel data and provide the same to the code division multiple demodulator; A plurality of broadcast information processing units for processing video information output from the code division multiple demodulator and outputting video data and audio data according to Walsh code allocation signals of the control unit among all tunable channels; A plurality of buffers for storing respective audio and video data output from the plurality of broadcast information processing units; And The switching unit is switched when the channel is changed according to the selection of the key input unit is provided as a switching control unit for outputting audio and video data of the buffer corresponding to the changed channel of the plurality of buffer units, characterized in that the digital TV Channel switching device. The method of claim 1, wherein the code division multiple demodulator, A plurality of delayers each delaying each broadcast signal provided from the plurality of tuners for a predetermined time; A plurality of dispensers which receive output signals of the plurality of delayers and broadcast signals provided from the plurality of tuners and spread them according to Walsh code assignment signals of the controller; And And a combiner for demodulating the output signals of the plurality of dispensers in accordance with the output signal of the filter and the path searcher for correcting the phase change of the broadcast signals provided from the plurality of tuners. TV's channel switching device.