KR20030035745A - Digital set top box having a function for storing/playing a audio/video signal for the satellite signal, cable signal and ground wave - Google Patents

Abstract

The present invention converts an external audio / video signal other than a satellite broadcast signal into a digital signal to record and reproduce the data on a storage medium, while receiving and recording / reproducing a cable signal and a digital terrestrial signal as well as the external analog signal. A digital set-top box having a storage / playback function of an external audio / video signal.

In addition, the digital set-top box having a storage / playback function of the external audio / video signal and accommodating various networks tunes a high frequency signal transmitted from a predetermined satellite / cable / ground, and the video data and the audio data of the selected channel. And a digital set-top box accommodating various networks for converting and outputting a predetermined signal into a predetermined signal for display on a display device after separating program data, wherein the digital set-top box is a digital satellite broadcasting signal / cable signal according to a user selection operation. And a network interface module unit including a tuner unit for tuning the ground wave signal, converting each of the tuned signals into an intermediate frequency signal, and frequency-reducing the signal received from the tuner unit according to a demodulation operation. 200, and its network interface module unit 20 The encoder unit 110 is configured to display the audio / video signal received from 0) on a predetermined storage medium for displaying through the MPEG unit or performing an external monitoring function; The encoder unit 110 includes an audio-analog digital conversion unit 112 for converting an analog audio signal (AUDIO IN) of a microphone, a camcorder, a CCTV camera cable, a terrestrial signal into a PCM digital audio signal, and the microphone, camcorder, or CCTV. A video decoder unit for receiving analog video signals (E-VIDEO IN1, E-VIDEO IN2) output from two or more devices such as a camera and converting one selected analog video signal into a digital video signal according to a user's selection ( 116 receives the PCM digital audio signal and the digital video signal outputted from the video input selector 114, the audio analog digital converter 112, and the video input selector 114, and transmits the TS through MPEG2 encoding. The MPEG2 encoder unit 118 for converting into a stream form, the data signal of the MPEG2 encoder unit 118 and the data signal of the CPU are input and communicated under user control. Or an encoded MPEG2 output from the MPEG2 stream signal TS IN1 and the MPEG2 encoder 118 output by the data input selection unit 120 for selecting and outputting any one of data download data. One of the stream signals TS IN2 is selected to output a digital satellite broadcasting / cable broadcasting / terrestrial broadcasting receiving TS signal or a monitoring TS signal and then, through the tuner unit 100, the applied transponder stream is demultiplexed. TS input for outputting to the MPEG2 demultiplexer 132, which separates the data bitstream, the audio bitstream, and the video bitstream, respectively, and performs digital satellite broadcasting, cable broadcasting, terrestrial broadcasting, or external monitoring function. Achieved by including the portion 130 included therein; As a result, a digital set-top box that accommodates a variety of networks can be used as an external surveillance function when going out, going to bed, or not watching a broadcast. Therefore, the cost of separately purchasing and installing a digital set-top box and monitoring equipment that accommodates various networks is reduced. This can improve the competitiveness of the product.

Description

Digital set top box having a function for storing / playing a audio / video signal for the satellite signal, cable signal and ground wave}

The present invention relates to a digital set-top box having a storage / playback function of an external audio / video signal and accommodating various networks, and more specifically, to an external analog audio / video signal other than a digital satellite broadcasting / cable broadcasting / terrestrial broadcasting signal. It converts into digital signal, records and plays back to the storage media, adds external monitoring function to the digital set-top box that accommodates the various networks, and enables easy reproduction of signals other than digital satellite, cable, and terrestrial broadcast signals. The present invention relates to a digital set-top box having a storage / playback function of an external audio / video signal and accommodating various networks.

The digital set-top box accommodating the various networks receives the information such as broadcast signals, information tables, time data tables, etc. for each channel included in the bitstream from digital satellite broadcasting / cable broadcasting / terrestrial broadcasting. Various menu screens are included to show.

A block diagram of a general satellite broadcasting receiver is shown in FIG.

As shown in FIG. 1, when a channel tuning data for tuning of a predetermined satellite broadcasting channel is received and a user selects a desired broadcasting channel, the tuner unit 100 converts the tuned satellite broadcasting frequency into an intermediate frequency signal to reduce the frequency. And a four-phase shift demodulator (QPSK) and a four-phase shift demodulator (102) for digitally converting and outputting the signal received from the tuner unit 100 to the transponder stream. MPEG2 demultiplexing for separating and processing the transponder stream output from the shift demodulation unit 102 into a data bitstream, an audio bitstream, and a video bitstream by demultiplexing according to a control operation of the CPU 140. The video bitstream and the audio bitstream separated from the channel selected by the MPEG2 demultiplexer 132 into video data and audio data, respectively. An MPEG2 video decoder 134 and an MPEG2 audio decoder 142, and an audio-to-digital analog converter 144 for converting and outputting digital audio data output from the MPEG audio decoder 142 into an analog audio signal; A video encoder 136 for converting and outputting digital video data output from the MPEG2 video decoder 134 into an analog video signal, and the four-phase shift demodulation unit 102 under the control of the central processing unit 140. An ATAPI (AT Attachment Packet Interface) control unit 138 reads / writes the audio bitstream and the video bitstream output from the storage device (HDD) 146.

Reference numeral 148 is a microcomputer unit unit.

Referring to the operation of the satellite broadcasting receiver according to the prior art configured as described above are as follows.

First, when the system is activated according to a predetermined power supply, the satellite broadcasting receiver initializes the system to set an operation mode for the hardware of the system and initializes the system. It includes booting programs such as setting initial values, main programs that can perform system functions, fonts and graphic programs for various menu configurations, and the satellite broadcasting receiver can also multiplex TV signals (video / audio signals). In this case, each video audio signal is divided into a bit string of appropriate length called a "packet", and the video audio packet is transferred by attaching additional information such as a header to the repeater in a time division transmission method. The packet transmitted through the repeater is restored to the original signal through the satellite broadcast receivers of the subscribers. And to enable the viewer for the transmission channel by the broadcaster.

In other words, the broadcasting station converts the TV signal into a digital TV signal, compresses it, and transmits it to the satellite, and when the communication satellite receives the TV signal in space and amplifies and retransmits it through the repeater, the tuner unit 100 of the satellite broadcasting receiver After the user tunes to the desired broadcast channel, the frequency is lowered, and the four-phase shift demodulator 102 demodulates and digitally converts the signal received from the tuner 100.

The digitally converted signal output to the transponder stream is divided into a data bitstream, an audio bitstream, and a video bitstream according to the MPEG2 standard by the MPEG2 demultiplexer 132, and then the MPEG2 video decoder 134. And the video bitstream and the audio bitstream in the MPEG2 audio decoder 142 are respectively restored to video data and audio data. Thereafter, the signal multiplexed into the audio / video bitstream according to the MPEG-2 standard is converted into an analog audio signal and a video signal through an audio digital analog converter 144 and a video encoder 136, respectively.

Accordingly, the TV signal relayed through the communication satellite performs a demodulation process in the satellite broadcasting receiver, and the user can watch a program for the corresponding channel transmitted from the broadcasting station.

The AT Attachment Packet Interface (ATAPI) control unit 138 reads the audio bitstream and the video bitstream converted into digital signals by the MPEG2 demultiplexer 132 to the hard disk drive (HDD) 146. You can read / write.

However, the satellite broadcast receiver according to the prior art is designed to receive only a broadcast signal applied through a communication satellite, for example, since an external input video / audio signal such as a camcorder, a TV, a VTR, or a CCTV cannot be received. When the external input signal is to be applied to perform the external monitoring function, there is a problem in that the purchase and installation costs are increased by separately purchasing and installing the satellite broadcasting receiver and the monitoring equipment.

In addition, the satellite broadcasting receiver outputs only the above-mentioned satellite broadcasting video / audio signals and displays them on a TV set, and receives signals other than satellite broadcasting signals such as digital cable signals / terrestrial signals as well as external input video / audio signals. Since it was not, the scope of application was extremely limited and inefficient.

Accordingly, the present invention has been made to solve the above problems, by converting the external analog audio / video signal other than the satellite broadcast signal to a digital signal to be stored in the storage medium and reproduced according to a predetermined selection function, It is an object of the present invention to provide a satellite broadcasting device having a storage / playback function of an external audio / video signal to add an external winding function to the satellite broadcasting receiver itself.

In addition, the present invention converts an external audio / video signal other than a satellite broadcast signal into a digital signal to record and reproduce it on a storage medium, and receives and records and reproduces not only the external analog signal but also a digital cable signal / ground wave signal. The present invention relates to a digital set-top box that accommodates a variety of networks having a storage / playback function of an external audio / video signal.

In order to achieve the above object, a satellite broadcasting apparatus having a storage / reproducing function of an external audio / video signal tunes a high frequency signal transmitted from a predetermined satellite and performs video data and audio on the selected channel. In the satellite broadcasting receiver which separates the data and program data into a predetermined signal for display on the display device, the satellite broadcasting receiver is applied from the outside to perform an external monitoring function according to a user selection operation. A predetermined data conversion operation so as to store the audio (AUDIO IN) / video signals (E-VIDEO IN1, E-VIDEO IN2) to a predetermined storage medium and to display the broadcast data tuned by the predetermined tuner on the display device. The encoder unit is configured to include a microphone, a camcorder or a CCTV camera. An audio analog digital converter for converting an output analog audio signal into a PCM digital audio signal, and an analog video signal output from two or more devices such as a microphone, a camcorder, or a CCTV camera, and receiving the analog video signal according to a user's selection. A video input selection unit for outputting an analog video signal of any one of the signals to a video decoder unit, MPEG-2 to the PCM digital audio signal and the digital video signal output from the audio analog digital conversion unit and the video input selection unit An MPEG2 encoder unit for converting to a TS stream form by encoding, a data input selection unit for receiving a data signal of the MPEG2 encoder unit and a data signal of a CPU and selecting and outputting either communication or data download data by user control; , The tuner unit Select one of the output MPEG2 stream signal TS IN1 and the encoded MPEG2 stream signal TS IN2 output from the MPEG2 encoder unit to output the satellite broadcasting reception TS signal or the monitoring TS signal, and then mediate the tuner unit. TS input selection for performing satellite broadcasting or external monitoring function by outputting the transponder stream to the MPEG2 demultiplexer which separates the applied transponder stream into data bit stream, audio bit stream, and video bit stream. It is characterized in that the addition is configured.

In addition, the digital set-top box for accommodating a variety of networks having a storage / playback function of the external audio / video signal according to another embodiment of the present invention, tuned and tuned to a high-frequency signal transmitted from a predetermined satellite / cable / ground In a digital set-top box that accommodates a variety of networks that separate the video data, audio data and program data for the channel and then converts and outputs a predetermined signal for display on the display device, the digital set-top box is a user-selected operation A tuner unit which tunes a digital satellite broadcasting / cable signal / terrestrial signal, converts each of the tuned signals into an intermediate frequency signal, and frequency-reduces the signal received from the tuner unit according to a demodulation operation. It is configured to include an additional network interface module It said reproduction in accordance with the any one of the signals output from the network interface module to the data demodulation unit process is characterized in that storage.

1 is a block diagram showing a general satellite broadcasting receiver;

2 is a schematic block diagram showing a satellite broadcasting receiver having a storage / playback function of an external audio / video signal according to a preferred embodiment of the present invention;

3 is a detailed block diagram of an encoder of FIG. 2;

Figure 4 is a block diagram showing another embodiment of a digital set-top box having a storage / playback function of the external audio / video signal of the present invention.

* Explanation of symbols for the main parts of the drawings *

110: encoder unit, 112: audio analog digital conversion unit,

114: video input selection unit, 116: video decoder unit,

118: MPEG2 encoder section, 120: data input selection section,

130: TS input selector.

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

FIG. 2 is a schematic block diagram showing a satellite broadcasting receiver having a storage / playback function of an external audio / video signal according to a preferred embodiment of the present invention. FIG. 3 is a detailed block diagram of an encoder of FIG.

First, in describing the embodiments of the present invention, the same parts as in the prior art will be described with the same reference numerals, and only different parts will be described.

First, as shown in FIG. 2, the satellite broadcasting receiver according to the present invention is an external analog audio (AUDIO IN) / video signal (E-VIDEO IN1, E-VIDEO IN2) such as a microphone or a camcorder. Receives a signal output from a CCTV camera, etc., and stores it in a hard disk drive (HDD) 146, which is a predetermined storage medium in order to perform an external monitoring function according to a user selection operation, while being applied from the tuner unit 100. The encoder unit 110 is included to display the signal on the display device.

As shown in FIG. 3, the encoder unit 110 includes an audio-analog digital converter 112 for converting an analog audio signal AUDIO IN output from a microphone, a camcorder, or a CCTV camera into a PCM digital audio signal. Receives analog video signals (E-VIDEOIN1, E-VIDEO IN2) output from two or more devices such as a microphone, camcorder or CCTV camera, and converts any one selected analog video signal to a digital video signal according to the user's selection The video input selection unit 114 outputs to the video decoder unit 116 and the PCM digital audio signal and the digital video signal output from the audio analog digital conversion unit 112 and the video input selection unit 114. The MPEG2 encoder 118 converts the TS stream form by MPEG2 encoding, the data signal of the MPEG2 encoder 118 and the data signal of the CPU 140 to be used. Data input selection unit 120 for selecting and outputting any one of communication or data download data by self control, and encoding output from MPEG2 stream signal TS IN1 and MPEG2 encoder unit output from the tuner unit 100. After selecting one of the satellite broadcast reception TS signal and the monitoring TS signal among the MPEG2 stream signals TS IN2, the data streams, audio bit streams, and the like are The TS input selector 130 is configured to output to the MPEG2 demultiplexer 132 that separates the video bit streams, respectively, and to perform satellite broadcasting or external monitoring.

The operation of the satellite broadcasting receiver having the storage / playback function of the external audio / video signal configured as described above will be described with reference to the accompanying drawings.

First, when the satellite broadcast signal selected by the user is received through the tuner unit 100 and then frequency is down, the received satellite broadcast signal is the four-phase shift demodulator 102 and the MPEG2 demultiplexer 132 as described above. After performing a series of demodulation processes through the MPEG2 video decoder 134, the MPEG2 audio decoder 142, the audio-to-digital analog converter 144, and the video encoder 136, the user via a TV set. You will be watching the program for that channel.

Although not shown in the drawing, the MPEG2 demultiplexer 132 receives compressed encoded video and audio in an elementary stream (ES) format and transmits TS packets for program transmission and control information necessary for demultiplexing ( Program Specific Information (PSI): A TS packet generation unit generating a packet and a TS multiplexing technology for generating a single transport bit sequence by multiplexing each TS packet are applied, and the TS packet generation unit is a PES packet first from an ES packet to be input. Then, the PES packet is composed of TS packets of 188 byte units and transmitted.

Meanwhile, an analog audio signal output from a microphone, a camcorder, or a CCTV camera by an encoded MPEG2 stream signal output from the MPEG2 encoder 118 without a user watching a broadcast signal applied through the tuner unit 100. Can be stored and played on the hard disk drive 146, which will be described below.

First, when the external monitoring mode is set according to the operation of the TS input selector 130, the analog audio signal (AUIIO IN) output from the microphone or the camcorder and the CCTV camera is transferred to the PCM digital through the audio analog digital conversion unit 112. The analog video signals E-VIDEO IN1 and E-VIDEO IN2, which are converted into audio signals and output from two or more devices, are selected by the video input selection unit 114, and then the video decoder unit is used. In step 116, the digital video signal is converted.

Then, the MPEG2 encoder 118 which receives the PCM digital audio signal and the digital video signal output from the audio analog digital converter 112 and the video input selector 114 converts the TS stream into a TS stream form by a predetermined MPEG2 encoding. After that, it is transmitted to the TS input selector 130, and the TS input selector 130 encodes the MPEG2 stream signal TS IN1 output from the tuner 100 and the encoded MPEG2 stream output from the MPEG2 encoder. After selecting one of the satellite broadcasting reception TS signal and the monitoring TS signal among the signals TS IN2 (the mode selected by the user: the monitoring TS signal), the MPEG2 demultiplexer described above the MPEG2 stream signal for the external monitoring function. 132 is applied.

Accordingly, the AT Attachment Packet Interface (ATAPI) control unit 138 receives the audio bitstream and the video bitstream converted by the MPEG2 demultiplexer 132 and reads them into the hard disk drive (HDD) 146. You can read / write.

Thereafter, according to the selection operation of the data input selection unit 120, the data signal of the MPEG2 encoder unit 118 and the data signal of the CPU are input, and either one for communication or data download data is selected for output reproduction by user control. do.

On the other hand, Figure 4 is a block diagram showing another embodiment of a digital set-top box to accommodate a variety of networks having a storage / playback function of the external audio / video signal of the present invention.

According to another embodiment of the present invention, a cable and terrestrial signal as well as a satellite broadcast signal are received and are reproduced and stored through a series of demodulation processes.

As shown in FIG. 4, tuners 210, 212 and 214 tune the satellite broadcast signal / cable signal / terrestrial signal according to a user selection operation, convert the respective tuned signals into intermediate frequency signals, and frequency down the tuner. A network interface module unit 200 including demodulator units 220, 222, and 224 for processing signals received from the units 210, 212, and 214 according to a predetermined demodulation operation, and an audio / video signal received from the network interface module unit 200; The MPEG2 demultiplexer 132 and the MPEG2 demultiplexer 132 which respectively separate and process the data bitstream, the audio bitstream, and the video bitstream by demultiplexing according to the control operation of the CPU 140. MPEG2 video decoder 13 for restoring the video bit stream and the audio bit stream separated from the channel selected by 4) and an MPEG-2 audio decoder 142, an audio-digital analog converter 144 for converting and outputting digital audio data output from the MPEG audio decoder 142 into an analog audio signal, and the MPEG2 video decoder ( The video encoder 136 converts and outputs the digital video data output from the digital video signal 134 into an analog video signal, and the audio bit stream output from the four-phase shift demodulator 102 under the control of the central processing unit 140. And an AT Attachment Packet Interface (ATAPI) control unit 138 that reads / writes the video bitstream to the storage device (HDD) 146.

The operation of the digital set-top box for accommodating various networks according to another embodiment of the present invention configured as described above will be described.

Here, in describing another embodiment of the present invention, the description of the above-described satellite broadcasting receiver and overlapped portions will be omitted, and the digital cable signal and the terrestrial signal are tuned and output through a predetermined encoding process. Explain only the process.

First, among the broadcast signals applied through a predetermined communication satellite, broadcast data selected by the tuner unit 210 is demodulated and digitally converted by the four-phase shift demodulator 220, and the converted signal is processed as described above. After the MPEG2 demultiplexer 132 divides the data bitstream, the audio bitstream, and the video bitstream according to the MPEG2 standard, the MPEG2 video decoder 134 and the MPEG2 audio decoder 142 divide the video bitstream. And the audio bitstream are restored to video data and audio data, respectively. Then, the signal multiplexed into the audio / video bitstream according to the MPEG-2 standard is converted into an analog audio signal and a video signal through the audio-digital analog converter 144 and the video encoder 136, respectively.

Accordingly, the TV signal relayed through the communication satellite performs a demodulation process in the satellite broadcasting receiver, and the user can watch a program for the corresponding channel transmitted from the broadcasting station.

On the other hand, the signal applied through the cable is tuned by the tuner unit 212, and performs a demodulation process in the QAM demodulation unit 222 according to a normal quadrature amplitude demodulation (QAM) process, the central processing unit (CPU) By demultiplexing according to the control operation of 140, the MPEG2 demultiplexer 132 separates the signal into a data bitstream, an audio bitstream, and a video bitstream, respectively, and then the MPEG2 video decoder 134 and MPEG2. In the audio decoder 142, the video bitstream and the audio bitstream are restored to video data and audio data, respectively. Then, the signal multiplexed into the audio / video bitstream according to the MPEG-2 standard is converted into an analog audio signal and a video signal through the audio-digital analog converter 144 and the video encoder 136, respectively.

Similarly, the terrestrial signal is also tuned by the tuner 232 and then demodulated by the OFDM demodulator 224. As described above, the terrestrial signal is output as an analog audio signal and a video signal according to a demultiplexing process and a data restoration operation. .

In other words, according to another exemplary embodiment of the present invention, a digital set-top box accommodating various networks may receive a cable signal and a terrestrial signal as well as a satellite broadcasting signal, and then perform a demodulation process and display the same.

As described above, according to the satellite broadcasting receiver having a storage / playback function of an external audio / video signal of the present invention, an external analog audio / video signal other than the satellite broadcasting signal is converted into a digital signal and stored in a storage medium. And replay according to the schedule selection function, the satellite broadcasting receiver can be used as an external monitoring function when going out, going to bed, or not watching satellite broadcasting, so that the conventional satellite broadcasting receiver and monitoring equipment have to be purchased and installed separately. Not only does it eliminate the cost, but also reduces the cost of purchase and installation.

In addition, the digital cable signal / terrestrial wave signal can be received and reproduced / stored, so it is possible to reproduce various video / audio signals through a digital set-top box that accommodates a variety of networks, not limited to satellite broadcast signal, further enhances the competitiveness of the product Can be improved.

Claims (3)

A digital set-top box that tunes a high frequency signal transmitted from a predetermined satellite, separates video data, audio data, and program data for a predetermined channel, and converts the signal into a predetermined signal for display on a display device. The digital set-top box stores an external audio (AUDIO IN) / video signal (E-VIDEO IN1, E-VIDEO IN2) in a predetermined storage medium in order to perform an external monitoring function according to a user selection operation. The encoder unit 110 is configured to display the broadcast signal applied from The encoder unit 110 includes an audio-analog digital conversion unit 112 for converting an analog audio signal (AUDIO IN) output from a microphone, a camcorder, or a CCTV camera into a PCM digital audio signal, and the microphone, camcorder, or CCTV camera. The video decoder unit 116 receives analog video signals (E-VIDEO IN1, E-VIDEO IN2) output from two or more devices and converts one selected analog video signal into a digital video signal according to a user's selection. A PCM digital audio signal and a digital video signal outputted from the video input selection unit 114, the audio analog digital conversion unit 112, and the video input selection unit 114 are outputted in the form of TS stream by MPEG2 encoding. The MPEG2 encoder unit 118 for converting, the data signal of the MPEG2 encoder unit 118, and the data signal of the CPU are inputted for communication or data by user control. A data input selection unit 120 for selecting and outputting any one of the download data, and an encoded MPEG2 stream signal output from the MPEG2 stream signal TS IN1 and the MPEG2 encoder unit 118 output from the tuner unit 100. Select one of the TS IN2 to output the satellite broadcast reception TS signal or the monitoring TS signal, and then, through detuning the applied transponder stream through the tuner unit 100, the data bit stream, audio bit stream, External audio / characteristics comprising a TS input selector (130) for outputting to the MPEG2 demultiplexer (132) for separate processing into video bit streams to perform satellite broadcasting or external monitoring functions. Digital set-top box with storage and playback of video signals. A digital set-top box that tunes a high frequency signal transmitted from a predetermined satellite, separates video data, audio data, and program data for a predetermined channel, and converts the signal into a predetermined signal for display on a display device. The digital set-top box tunes the satellite broadcast signal, the cable signal and the terrestrial signal according to a user selection operation, and converts each tuned signal into an intermediate frequency signal to frequency down the tuner unit 210,212,214 and the tuner unit 210,212,214. The network interface module 200 includes a demodulator 220, 222, 224 for signal processing according to a predetermined demodulation operation, any one signal output from the network interface module 200 A digital set-top box having a storage / playback function of an external audio / video signal, which is displayed on a predetermined display device according to a data demodulation process. The method of claim 2, The network interface module 200 tunes the satellite broadcast signal, the cable signal and the terrestrial signal, respectively, and converts each of the tuned signals into an intermediate frequency signal to reduce the frequency. QPSK demodulation unit 220 and QAM demodulation unit 222 which signal-process the unit 212 and the terrestrial tuner unit 214 and the signals received from the respective tuner units 210, 212, and 214 according to a predetermined demodulation operation. A digital set-top box having a storage / playback function of an external audio / video signal, characterized in that it comprises a QFDM demodulation unit (224).