KR19980078248A - Analog / Digital Broadcast Receiver of Settub Box - Google Patents

Abstract

The present disclosure relates to an analog / digital broadcast receiving apparatus of a settub box that selectively receives both analog broadcasting and digital broadcasting in one settub box and displays them on a screen.

The present invention provides a diplexer for eliminating interference of a carrier received through a satellite broadcast tuner, filter means for detecting a band of a digital signal in the carrier from which the interference is removed, and converting the detected carrier into digital and amplitude. A quadrature amplitude modulation means for modulating, automatic error correction means for correcting errors in the modulated carrier data, and reconstructing the corrected carrier data into video data and audio data according to a phase shift modulated signal of a quadrature phase shift modulating means; A set-tub box comprising MPEG processing means, comprising: demodulation means for demodulating a signal in an analog frequency band of a carrier wave obtained by the diplexer and separating the signal into a video signal and an audio signal; Demixing means for demixing the demodulated analog video signal with the original signal when the demodulated analog video signal is mixed; Voice multiplexing means for multiplexing the demodulated analog audio signal; And at least one selection means for selecting and outputting any one of video and audio of an analog video signal and an audio signal obtained by the demixing means and the audio multiplexing means and the video data and the audio data obtained by the MPEG processing means. It is characterized by.

Description

Analog / Digital Broadcast Receiving Device in Settub Box.

The present invention relates to analog / digital broadcasting reception of a settub box, and more particularly, to terrestrial broadcasting or analog cable broadcasting provided by a program provider or a service provider in a device using a digital transmission method such as a high definition television. The present invention relates to an analog / digital broadcast receiving apparatus of a settub box for selectively receiving.

Recently, due to the rapid development of information media, information (data) has been shifted from analog to digital.

At this time, in response to a request to transmit more information within the same time, data is compressed and transmitted according to a data compression rule called 'MPEG'.

MPEG stands for Moving Picture Experts Group (International Standard for Media Integrated Video Compression), which is a digital video encoding (compression), sound coding and multi-separation method for common use in communications, broadcasting, storage media, and computers. This is a coding method standardized by ISO (International Organization for Standardization).

This MPEG compresses and transmits audio visual, that is, audio signals, moving images, and still images at a high compression rate, thereby achieving multi-channel and high-quality transmission effects in broadcasting, and reducing storage volume and low cost in storage media. It is possible to obtain the effect of recording the multimedia information in the storage media of the media, and in the communication media can be obtained the advantage of being able to perform the multimedia communication at a low price, has recently become a core technology of the multimedia era.

On the other hand, general televisions are standardized to process analog broadcasting signals. As satellite broadcasting and other digital broadcasting methods are spreading, compression and transmission are performed according to MPEG regulations so that users can watch digital broadcasting signals through analog televisions. In order to process the converted digital broadcast signal into an analog broadcast signal, a separate conversion device called a "digital set top box" is provided.

The digital set tub box is a program provider or a service provider, that is, a broadcast capable of signal processing to a television by converting a digital video signal such as each broadcasting station or a cable broadcasting station such as cable television and satellite broadcasting into an analog video signal. Background Art [0002] As a device for converting a system, it is rapidly spreading in recent years due to the desire of consumers to watch digital broadcast signals.

Therefore, each broadcasting station or a cable broadcasting station converts and provides a program analog signal of a service into a digital signal.

The converted data is compressed by a predetermined compression method to transmit a lot of information, and then transmitted to the subscriber side through the communication network.

The subscriber side is provided with the digital set-tub box as described above, and receives the transmitted digital data, converts it into an analog signal, and displays it on a monitor.

As such, a receiving apparatus as shown in FIG. 1 is a device for processing a digital signal compressed and transmitted by each broadcasting station or a cable broadcasting station and displaying the same on an monitor.

The apparatus shown in FIG. 1 will be described as an example of a conventional digital broadcasting receiver of a settub box.

The digital receiver of the settub box tunes a compressed hybrid carrier signal transmitted from each broadcasting station or a wired broadcasting station through the input terminal 100 to a frequency of a corresponding channel, and the tuned carrier signal. Satellite interference tuner 101 which changes the amplitude of the signal in proportion to the magnitude of the phase shift modulated signal inputted from the outside, and eliminates the mutual interference between the video signal and the audio signal in the carrier wave obtained by tuning through the satellite broadcast tuner 101. And a diplexer 102 for providing the phase shift modulated signal to the satellite broadcast tuner 101, a filter unit 103 for filtering the carrier signal obtained from the diplexer 102, and extracting only a digital signal band; An analog / digital converter 104 for converting the analog signal extracted from the filter unit 103 into a digital signal and outputting the digital signal; Quadrature Ampliture Modulation (QAM) for receiving two carrier signals having the same frequency and 90 degrees different from each other from 104 to receive two carrier signals, each of which is amplitude-modulated into two discrete signals that may have finite values. And an automatic error correction unit for correcting the carrier data format modulated by the quadrature amplitude modulator 105 based on the surplus information and outputting the data in units of packets in order to correct errors caused by interference between adjacent channels. And a quadrature phase shift that provides the phase shift modulated signal to the satellite broadcast tuner 101 through the diplexer 102 to change the instantaneous phase of the carrier wave input through the satellite tuner 101. The phase shift modulated signal of the quadrature shift modulator 107 is input to the video data and audio data input through the modulator 107 and the automatic error correcting unit 106. Restored according to the memory unit 110, and converted to the original composite video signal (CPSV) and audio signal (ADS) and output to the video output terminal 112 and the audio output terminal 113, respectively; 108 and a high frequency modulator 109 for modulating the digital composite video signal (CPSV) and the audio signal (ADS) restored by the MPEG processor 108 into a high frequency signal and providing the same to a television receiver through an output terminal 111. It consists of.

In the conventional digital broadcast receiver of the set-tub box configured as described above, when a digital video signal and an audio signal for a program are compressed and mixed in each broadcasting station or a cable broadcasting station and input as a carrier signal through the input terminal 100, The satellite broadcast tuner 101 tunes a compressed hybrid carrier signal received and inputted through the input terminal 100 to a frequency of a corresponding channel and quadrature phases of the amplitude of the tuned carrier signal to be described later. The shift modulator 107 changes in proportion to the magnitude of the phase shift modulated signal.

Then, the amplitude-changed carrier signal is provided to the diplexer 102 through the satellite broadcast tuner 101.

The diplexer 102 removes the mutual interference between the compressed video signal and the audio signal among the carrier signals obtained by tuning through the satellite broadcast tuner 101 and provides the filter unit 103 with the quadrature phase shift. The phase shift modulated signal generated by the modulator 107 is provided to the satellite broadcast tuner 101.

Meanwhile, the filter unit 103 filters the carrier signal input from the diplexer 102 to detect only the digital signal band, that is, the 450 MHz to 700 MHz band.

The carrier signal of the analog component detected by the filter unit 103 is provided to the quadrature amplitude modulator 105 after being converted into a digital signal through the analog / digital converter 104.

The quadrature amplitude modulator 105 receives two digital carrier data having the same frequency from the analog / digital converter 104 and having a phase difference of 90 degrees from each other and amplitude modulates the two discrete signals into two discrete signals.

The carrier data modulated by the quadrature amplitude modulator 105 is amplitude-modulated by the automatic error correction unit 106 to correct errors caused by the interference between adjacent channels, and transmits the original data to the MPEG processor 108 as original video and audio packet data. Is provided.

On the other hand, the quadrature phase shift modulator 107 generates a phase shift modulated signal and is provided to the MPEG processor 108.

Accordingly, the MPEG processor 108 synchronizes and restores the video data and the audio data input from the automatic error correcting unit 106 to the phase shift modulated signal of the quadrature phase shift modulating unit 107 and then stores the video data and audio data. ), And also amplified into an original composite video signal (CPSV) and an audio signal (ADS), and output the same through each of the video output terminal 112 and the audio output terminal 113, and also the high frequency modulator 109. To be provided.

The high frequency modulator 109 modulates the composite video signal CPSV and the audio signal ADS processed by the MPEG processor 108 into a high frequency signal and provides the same to the television receiver through the output terminal 111. Viewers will be able to watch digital broadcasts through the Color Awards.

Then, the composite video signal and the audio signal output to the video output terminal 112 and the audio output terminal 113 are provided to a digital video disc player or digital VR to be recorded on a magnetic recording medium.

However, the above-described conventional digital broadcast receiver of the set-tub box, as is well known, if the received broadcast signal and cable signal is a digital signal and receives it and displays it on the color receiver, but if terrestrial broadcasting or In the case of analog cable broadcasting, it can be seen that it is impossible to directly receive the analog signal.

Therefore, the conventional set-tub box has a problem in that it is impossible to receive analog signals transmitted by terrestrial or cable broadcasting, so that only digital broadcasting must be viewed through the set-tub box.

Therefore, a receiver of a settub box capable of receiving analog / digital broadcasts equivalent to or more than the conventional one without terrestrial broadcast or analog cable broadcast cannot be viewed.

Accordingly, the present invention excludes the reception of the terrestrial broadcasting or the analog cable broadcasting which the settub box has in the conventional technology described above, and in one aspect of the present invention, receives both analog broadcasting and digital broadcasting in one settub box. It is an object of the present invention to provide an analog / digital broadcast receiving apparatus of a settub box to display on the screen.

In another aspect of the present invention, it is an object of the present invention to receive both analog and digital broadcasts and to display any one broadcast on the screen at the viewer's choice.

In another aspect of the present invention, an object of the present invention is to provide convenience and maintain compatibility with a television receiver by receiving analog broadcasting and digital broadcasting through one set tub box.

In still another aspect of the present invention, an object of the present invention is to multiply a received voice signal by providing a voice multiple function to the settub box.

In still another aspect of the present invention, a descrambling (demixing) function is provided to a settub box so that a received signal is descrambled when it is scrambling and displayed on the screen.

1 is a block diagram showing a digital receiver of a conventional settub box.

Figure 2 is an embodiment block diagram provided in the description of the analog / digital broadcast receiving apparatus of the settub box of the present invention.

FIG. 3 is a diagram illustrating an input frequency band in the case of a hybrid fever curve communication network structure for explaining the present invention. FIG.

<Description of the symbols for the main parts of the drawings>

201: satellite tuner 202: diplexer

203: filter unit 204: analog / digital conversion unit

205: right angle amplitude modulator 206: automatic error correction unit

207: quadrature phase shift modulator 208: demodulator

209: voice multiple processing unit 210: reverse mixing unit

211: MPEG processing unit

In accordance with an aspect of the present invention, an analog / digital broadcast receiving apparatus for a settub box includes: a diplexer for removing interference of a carrier wave received through a satellite broadcast tuner; Filter means for detecting a band of a digital signal on the carrier from which the interference is removed; Quadrature amplitude modulation means for converting the detected carrier into digital and amplitude modulating; Automatic error correction means for correcting an error of the modulated carrier data; A set-tub box comprising MPEG processing means for restoring the corrected carrier data into video data and audio data according to a phase shift modulated signal of a quadrature phase shift modulating means, comprising: a signal in an analog frequency band of a carrier obtained by the diplexer Demodulation means for demodulating the signal into analog video and audio signals; And first and second selection means for selecting and outputting any one of the separated analog video signal and the audio signal and the video data and the audio data of the MPEG processing means.

In the apparatus for receiving analog / digital broadcasting of a settub box according to the present invention, the first and second selection means are linked to each other by one operation to select analog video signals, audio signals, digital video signals, and audio signals, respectively. It is desirable to.

In the apparatus for receiving analog / digital broadcasting of a set stub box according to the present invention, when the first selecting means selects an analog video signal, the second selecting means is a digital audio signal, and the first selecting means is a digital video signal. It is preferable that the second selection means selects an analog audio signal when selecting.

According to another aspect of the present invention, there is provided an apparatus for receiving analog / digital broadcasting of a settub box, including: a diplexer for removing interference of a carrier wave received through a satellite broadcasting tuner; Filter means for detecting a band of a digital signal on the carrier from which the interference is removed; Quadrature amplitude modulation means for converting the detected carrier into digital and amplitude modulating; Automatic error correction means for correcting an error of the modulated carrier data; A set-tub box comprising MPEG processing means for restoring the corrected carrier data into video data and audio data according to a phase shift modulated signal of a quadrature phase shift modulating means, comprising: a signal in an analog frequency band of a carrier obtained by the diplexer Demodulation means for demodulating the signal into analog video and audio signals; Demixing means for demixing the demodulated analog video signal with the original signal when the demodulated analog video signal is mixed; Voice multiplex processing means for multiplexing the demodulated analog audio signal; And first and second selection means for selecting and outputting any one of video and audio of an analog video signal and an audio signal obtained by the demixing means and the audio multiplexing means and the video data and the audio data obtained by the MPEG processing means. It is characterized by including.

In this way, it can be seen that one set-tub box receives both analog and digital broadcasts and displays any one broadcast on the screen by the viewer's selection.

As a result, by receiving analog broadcast and digital broadcast through one set stub box, not only convenience of use is provided but also an advantage of maintaining compatibility with a television receiver.

In addition, through the additional voice multiplexing function and the demultiplexing function, there is an advantage that the information mixed with the voice multiplex processing can be solved and viewed.

And, there may be a plurality of embodiments of the present invention, the following will be described in detail with respect to the most preferred embodiment.

This preferred embodiment enables a better understanding of the objects, features and advantages of the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the analog / digital broadcast receiving apparatus of the settub box according to the present invention.

Further, the present invention can be applied to various receivers for receiving digital broadcasts, for example, high definition television receivers.

Thus, FIG. 2 used in the description is a drawing focusing on various digital broadcasting receivers rather than a specific set tub box.

In the following description, an example of using an analog / digital broadcasting receiver of a settub box in a general analog television receiver is considered.

Figure 2 is a block diagram of an embodiment provided in the description of the analog / digital broadcasting receiver of the settub box of the present invention.

According to the present embodiment, a compressed hybrid carrier of an analog or digital broadcast transmitted from each broadcasting station or a cable broadcasting station and input through the input terminal 200 is tuned to a frequency of a corresponding channel, and the amplitude of the tuned carrier signal is externally adjusted. A satellite broadcast tuner 201 that changes in proportion to the magnitude of a phase shift modulated signal input from the mobile station; and a phase difference between the video signal and an audio signal in a carrier wave tuned through the satellite broadcast tuner 201, and A diplexer 202 for providing a mobile modulation signal to the satellite broadcast tuner 201, a filter unit 203 for extracting only a digital signal band from a carrier wave input through the diplexer 202, and the filter unit. To an analog / digital converter 204 for converting the analog signal extracted in step 203 into a digital signal and outputting the analog signal. Quadrature amplitude modulator 205 for receiving two carriers having the same frequency and 90 degrees out of phase with each other, and modulating the discrete signals with discrete signals, and correcting errors caused by interference between adjacent channels. In order to change the instantaneous phase of the carrier wave inputted through the satellite broadcasting tuner 201 and the automatic error correction unit 206 for correcting the carrier data format modulated by the amplitude modulator 205 and outputting the packet unit. Quadrature phase shift modulator 207 for providing the phase shift modulated signal to the satellite broadcast tuner 201 through a diplexer 202, and video data and audio data input through the automatic error correction unit 206. Is recovered according to the phase shift modulated signal of the quadrature phase shift modulator 207 and stored in the memory unit 218, and the original composite video signal (CPSV) and audio signal (ADS) are stored. An MPEG processor 211 for converting and outputting a signal, and a demodulator 208 for extracting and demodulating signals of an analog frequency band among carriers input from the diplexer 202 to separate and output analog video signals and audio signals. When the analog video signal demodulated by the demodulator 208 is mixed, the inverse mixing unit 210 for demixing the signal to the original signal, and the analog audio signal demodulated by the demodulator 208 are voice multiplexed. In this case, any one of an audio multiplexing unit 209 for processing and outputting the audio multiplexing signal, an analog video signal input from the inverse mixing unit 210, and a digital composite video signal (CPSV) input from the MPEG processing unit 211 is provided. A first selector 212 that selects one video signal and outputs the selected video signal to the video output terminal 216, the analog audio signal processed by the audio multiplexer 209, and the A second selector 213 for selecting one audio signal from the digital audio signal ADS input from the peck processor 211 and outputting the selected audio signal to the audio output terminal 217; 212 and 213. The analog or digital video signal and the audio signal selected at 213 are modulated to a high frequency signal, and the high frequency modulator 214 is provided to the television receiver through the output terminal 215.

3 is a diagram showing a frequency band input when a hybrid fiber curb communication network structure for explaining the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in more detail with reference to FIG. 3.

First, when a digital video signal and an audio signal for a program as shown in FIG. 3 are compressed and mixed in each broadcasting station or a wired broadcasting station and input as a carrier signal through an input terminal 200, the satellite broadcasting tuner 201 may input the input terminal 200. Tunes the compressed hybrid carrier signal received and input through the channel to the frequency of the corresponding channel, and the amplitude of the tuned carrier signal is proportional to the magnitude of the phase shift modulated signal of the quadrature phase shift modulator 207 to be described later. Will change.

In other words, in the frequency band of FIG. 3, 5 MHz to 30 MHz is a telephone and interactive service (T / I) band, 54 MHz to 450 MHz is an analog video signal band, and 450 MHz to 700 MHz is compressed digital. It is a video signal band, and a digital telephone band from 700 MHz to 750 MHz.

Therefore, the satellite broadcast tuner 201 tunes the carrier signal having the above frequency band to the corresponding channel.

The carrier signal tuned to the corresponding channel through the satellite broadcast tuner 201 and changed in amplitude is provided to the diplexer 202.

The diplexer 202 removes the mutual interference of the compressed video signal and the audio signal among the carrier signals obtained by tuning through the satellite broadcast tuner 201, thereby filtering the filter unit 203 and the demodulator 208 to be described later. And a phase shift modulated signal generated by the quadrature phase shift modulator 207 to the satellite broadcast tuner 201.

The filter unit 203 filters the carrier signal input from the diplexer 202 to extract only the digital signal band, that is, the compressed 450 MHz to 700 MHz band, and provide it to the analog / digital converter 204. .

The carrier signal of the analog component extracted through the filter unit 203 is converted into a digital signal through the analog / digital converter 204 and then provided to the quadrature amplitude modulator 205.

The quadrature amplitude modulator 205 receives two digital carrier data having the same frequency from the analog / digital converter 204 and is 90 degrees out of phase with each other, and amplitude-modulates the two discrete signals into automatic error. The correction unit 206 is provided.

The automatic error correction unit 206 corrects an error caused by interference between adjacent channels from the satellite broadcast tuner 202 and provides the video and audio packet data to the MPEG processing unit 208.

Therefore, the MPEG processor 208 synchronizes and restores the video data and the audio packet data input from the automatic error correcting unit 106 to the phase shift modulated signal generated by the quadrature phase shift modulator 207 and input. The digital video signal is stored in the memory unit 218 and is processed into an original composite video signal (CPSV) and an audio signal (ADS) so that the digital video signal is transmitted to the first selector 212 and the digital audio signal is selected from the second selector ( 213).

Meanwhile, the demodulator 208 demodulates an analog signal band, that is, a 54 MHz to 450 MHz carrier signal into an original signal in the frequency band as shown in FIG. 3 input from the diplexer 202 and the analog video signal. The audio signal is separated and output.

The separated analog audio signal is provided to the voice multiplexer 209, and the video signal is provided to the demixer 210.

If the signal input from the demodulator 208 is voice multiplexed, the voice multiplexer 209 provides the voice multiplexing process to the second selector 213 without signal processing. do.

In addition, the demixing unit 210 descrambles (demixes) the analog video signal input from the demodulator 208 when the scrambling is applied, and immediately deselects the first video selection unit when the scrambling is not performed. To 212.

Accordingly, the first selector 212 selects any one of a digital composite video signal (CPSV) input from the MPEG processor 211 and an analog composite video signal input from the inverse mixing unit 210 by the user. It outputs to the output terminal 215 and is provided to the high frequency modulator 214, the second selector 213 also the digital audio signal (ADS) and the voice multiple processor 209 of the MPEG processor 211 by the user One of the analog audio signal of the () is selected and output to the audio output terminal 217 and provided to the high frequency modulator 214.

The high frequency modulator 214 modulates an input analog or digital video / audio signal into a high frequency signal and provides the same to a television receiver through an output terminal 215, whereby the viewer can receive digital broadcasts through the color receiver of the television receiver. You can watch analog broadcasts.

The composite video signal (CPSV) and the audio signal (ADS) outputted to the video output terminal 216 and the audio output terminal 217 are provided to a digital video disc player or digital VR to be recorded on a magnetic recording medium. .

As can be seen from the result of the application example, the video signal and the audio signal of the digital broadcast output from the MPEG processor 211 or the video signal and the audio signal of the analog broadcast output from the demixing unit 210 and the voice multiplexer 209. Can be seen by the user's selection.

On the other hand, as a comparative example, unlike the conventional configuration, that is to say that the MPEG processing of the video signal and the audio signal of the digital broadcast through the MPEG processing unit of the set-tub box, the present invention provides a demodulation unit for receiving analog broadcasting and Since the first and second selectors are used, analog signals transmitted by terrestrial waves or cable broadcasts as well as digital broadcasts can be received.

As a result, according to the present invention, it can be seen that by receiving both the analog broadcast and the digital broadcast through one set stub box, convenience in use and compatibility with the television receiver are maintained.

In addition, while specific embodiments of the present invention have been described and illustrated above, it is obvious that the present invention may be variously modified and implemented by those skilled in the art.

Such modified embodiments should not be individually understood from the technical spirit or the prospect of the present invention, and such modified embodiments should fall within the appended claims of the present invention.

It is clear from the above description that, according to the analog / digital broadcast receiving apparatus of the settub box of the present invention, convenience in use is provided by receiving both terrestrial broadcasting or analog cable broadcasting in one settub box, and it is economical and the Is that compatibility is maintained.

In addition, as an additional function, it is possible to decrypt and view the voice multiplex process and the encrypted information through the voice multiplex function and the demixing function.

Claims (7)

A diplexer for removing interference of a carrier received through a satellite broadcast tuner, filter means for detecting a band of a digital signal in the carrier from which the interference is removed, and a quadrature amplitude for digitally converting and amplitude modulating the detected carrier Modulating means, automatic error correcting means for correcting errors in the modulated carrier data, and MPEG processing means for restoring the corrected carrier data into video data and audio data according to a phase shifting modulation signal of a quadrature phase shifting modulation means. In a set stub box: Demodulation means for demodulating a signal in an analog frequency band of a carrier obtained by said diplexer and separating it into a video signal and an audio signal; And And at least one selection means for selecting and outputting any one of the separated analog video and audio signals and the video and audio signals of the MPEG processing means. Broadcast receiving device. The method of claim 1, And the selecting means has two first and second selecting means for selecting one of the two video signals and the audio signal, respectively. The method of claim 2, And said first and second selecting means are linked to each other by one operation to select analog video signals, audio signals, digital video signals, and audio signals, respectively. The method of claim 2, When the first selection means selects the analog video signal, the second selection means selects the digital audio signal, and when the first selection means selects the digital video signal, the second selection means selects the analog audio signal. An analog / digital broadcasting receiver of a settub box. A diplexer for removing interference of a carrier received through a satellite broadcast tuner, filter means for detecting a band of a digital signal in the carrier from which the interference is removed, and a quadrature amplitude for digitally converting and amplitude modulating the detected carrier Modulating means, automatic error correcting means for correcting errors in the modulated carrier data, and MPEG processing means for restoring the corrected carrier data into video data and audio data according to a phase shifting modulation signal of a quadrature phase shifting modulation means. In a set stub box: Demodulation means for demodulating a signal in an analog frequency band of a carrier obtained by said diplexer and separating it into a video signal and an audio signal; Demixing means for demixing the demodulated analog video signal with the original signal when the demodulated analog video signal is mixed; Voice multiplexing means for multiplexing the demodulated analog audio signal; And at least one selection means for selecting and outputting any one of video and audio of an analog video signal and an audio signal obtained by the demixing means and the audio multiplexing means and the video data and the audio data obtained by the MPEG processing means. An analog / digital broadcasting receiver of a settub box. The method of claim 5, And the selecting means has two first and second selecting means for selecting one of the two video signals and the audio signal, respectively. The method of claim 6, And said first and second selecting means are linked to each other by one operation to select analog video signals, audio signals, digital video signals, and audio signals, respectively.