JP2007013820A - Tuner module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to have a viewing and listening of analog television broadcasting with an electronic apparatus corresponding to digital television broadcasting. <P>SOLUTION: A tuner module receives the electric wave of analog television broadcasting, and supplies it to an analog tuner part while it receives the electric wave of digital television broadcasting and supplies it to a digital tuner part. The digital tuner part chooses a predetermined signal from the electric wave of digital television broadcasting, and supplies a TS resulting from signal processing of a switching part. On the other hand, the analog tuner part chooses a predetermined signal from the electric wave of analog television broadcasting, and supplies a picture signal and a voice signal resulting from signal processing of a signal-processing part. The signal-processing part carries out compression coding, multiplexes the picture signal and the voice signal, changes them into a TS, and supplies it to the switching part. The switching part changes the TS supplied to the input terminal to predetermined, and supplies it to an electronic apparatus. The electronic apparatus gives signal processing to the supplied TS, and performs image display and voice output. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tuner module for television broadcasting capable of receiving digital television broadcasting and analog television broadcasting.

  Following the introduction of CS (Communication Satellite) digital broadcasting and BS (Broadcasting Satellite) digital television broadcasting, terrestrial digital television broadcasting has begun to be offered. TV receivers and tuners are expected to spread rapidly. In addition, with the spread of digital television broadcasting, analog television broadcasting is moving toward abolition.

  However, for example, terrestrial digital television broadcasting is not currently deployed nationwide and can be viewed only in some areas. Therefore, at present, analog television broadcasting is the mainstream, and it is considered that a function for receiving analog television broadcasting is necessary in the future.

  At present, digital television broadcast-compatible television receivers, PCs (Personal Computers), PDAs (Personal Digital Assistants), etc., are able to view both digital and analog television broadcasts. Many are equipped with a tuner for television broadcasting and a tuner for analog television broadcasting.

  As described above, Patent Document 1 describes a technique related to a television receiver compatible with analog television broadcasting and digital television broadcasting.

Japanese Patent Application Laid-Open No. 11-98426

  A tuner module and an electronic device that can receive conventional digital television broadcasting and analog television broadcasting will be schematically described. Here, a case where a tuner module including a digital television broadcast tuner and an analog television broadcast tuner is connected to an electronic device including a decoder corresponding to each broadcast will be described as an example.

  FIG. 5 shows an example of the configuration of a conventional tuner module 101 and electronic device 102. The digital communication interface 112 of the tuner module 101 and the digital communication interface 129 of the electronic device 102 are connected, and the analog communication interface 113 of the tuner module 101 and the analog communication interface 130 of the electronic device 102 are connected.

  The tuner module 101 is connected to an external antenna 103 and receives radio waves of digital television broadcast and / or analog television broadcast transmitted from the broadcast facility 104. The received digital television broadcast radio wave is supplied to the digital tuner unit 110, and the analog television broadcast radio wave is supplied to the analog tuner unit 111.

  In the broadcasting facility 104, for example, in the case of terrestrial digital television broadcasting, video, audio, and data are compressed and encoded by the MPEG-2 (Moving Picture Experts Group-2) system. In accordance with the provisions of MPEG-2 Systems, video data, audio data, and additional data added thereto are packetized for each channel and each data type, multiplexed in a time division manner, and transport stream. A packet sequence called (TS: Transport Stream) is generated.

  The generated transport stream (hereinafter referred to as TS as appropriate) is scrambled so that only a specific user can view it. Then, the scrambled TS is modulated and transmitted. For example, in the case of terrestrial digital television broadcasting, the modulation method is different from satellite digital television broadcasting, and it is necessary to consider reflected waves from mountains, buildings, etc., so that OFDM (Orthogonal Frequency Division Multiplex) that is resistant to multipath interference is used. ) Modulation method is used.

  For example, in the case of terrestrial analog television broadcasting, the broadcasting facility 104 transmits the video signal after AM (Amplitude Modulation) modulation and transmits the audio signal after FM (Frequency Modulation) modulation.

  Here, TS will be schematically described with reference to FIG. FIG. 6 shows the structure of TS. The TS is composed of TS packets as shown in FIG. 6A. The TS packet is a fixed-length packet of 188 bytes, and includes a TS header, a TS payload, and / or an adaptation field as shown in FIG. 6B. As shown in FIG. 6C, the TS header of the TS packet includes a synchronization byte for detecting the head of the TS packet, an error display indicating the presence or absence of a bit error in the packet, and the start of a new PES (Packetized Elementary Stream) packet. Unit start display indicating priority, priority indicating packet importance, packet IDentification (PID) indicating packet attributes, and the like. The adaptation field can indicate information related to data of the TS payload.

  The PID indicates a packet attribute by a 13-bit value, and the value varies depending on the type of data stored in the TS payload. This PID is used when filtering necessary TS packets.

  Returning to FIG. 5, the digital tuner unit 110 selects a signal of a predetermined frequency from the supplied digital television broadcast radio wave, performs predetermined signal processing such as demodulation and error correction, and outputs a TS. . The TS output from the digital tuner unit 110 is supplied to the digital communication interface 112 and is supplied to the electronic device 102 via the digital communication interface 129 of the electronic device 102 connected to the digital communication interface 112.

  On the other hand, the analog tuner unit 111 selects a signal having a predetermined frequency from the supplied analog television broadcast radio wave, and performs predetermined signal processing such as video intermediate frequency amplification and AM detection on the selected analog signal. In addition to taking out the video signal, the audio signal is taken out by performing predetermined signal processing such as audio intermediate frequency amplification and FM detection. The video signal and the audio signal are supplied to the analog communication interface 113 and supplied to the electronic device 102 via the analog communication interface 130 of the electronic device 102 connected to the analog communication interface 113.

  The TS supplied to the electronic device 102 via the digital communication interface 129 is supplied to the descrambler 120. The descrambler 120 performs processing for releasing the scramble and supplies it to a DeMUX (De-MUltipleXer) unit 121. The DeMUX unit 121 performs filtering based on the value of the PID stored in the header portion of the TS packet, extracts a necessary stream from the multiplexed TS, and supplies it to the digital decoder 122.

  The digital decoder 122 performs a decoding process corresponding to each data on the video data, audio data, and additional data included in the stream supplied from the DeMUX unit 121, and outputs the video signal, audio signal, and additional data. To do. The decoded video signal and additional data are supplied to the display unit 123. The additional data is supplied to the display unit 123, and can be displayed superimposed on the video signal by, for example, OSD (On Screen Display) processing. The audio signal is supplied to the audio output unit 124.

  On the other hand, the video signal and the audio signal supplied to the electronic device 102 via the analog communication interface 130 are supplied to the analog decoder 140. The analog decoder 140 performs signal processing such as color demodulation on the supplied video signal, and extracts a luminance signal and a color difference signal. The obtained luminance signal and color difference signal are supplied to the display unit 123, and the audio signal is supplied to the audio output unit 124.

  The display unit 123 switches and displays the video signal supplied from the digital decoder 122 and the analog decoder 140 according to a user request. The audio output unit 124 switches and outputs the audio signal supplied from the analog decoder 140 and the digital decoder 122 according to a user request.

  The operation unit 128 includes a keyboard, for example, and outputs channel selection information according to an operation such as a user selecting a channel. The channel selection information output from the operation unit 128 is supplied to a CPU (Central Processing Unit) 125.

  The CPU 125 controls each part of the electronic device 102 according to a program stored in advance in a ROM (Read Only Memory) 126 and also controls each part of the tuner module 101 via the digital communication interface 129. The CPU 125 has a RAM (Random Access Memory) 127 and is used as a work memory when executing the program. For example, the CPU 125 controls the digital tuner unit 110 and the analog tuner unit 111 so as to select a signal having a predetermined frequency based on the channel selection information supplied from the operation unit 128.

  As described above, since the video signal and the audio signal output from the analog television broadcast tuner cannot be transmitted using the digital communication interface, in order to supply such an analog signal to an electronic device, An analog communication interface is required. That is, in order to be able to view both digital television broadcasts and analog television broadcasts, a digital communication interface and an analog communication interface are required, and there is a problem that connection is troublesome.

  When viewing both digital television broadcast and analog television broadcast, the electronic device must be equipped with a digital television broadcast decoder and an analog television broadcast decoder. However, when an analog television broadcast decoder that will become unnecessary in the future is provided, there is a problem that costs are increased and downsizing of electronic devices is affected.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a tuner module that enables viewing of digital television broadcast and analog television broadcast with an electronic device that supports only digital television broadcast.

  In order to solve the above-described problem, the present invention includes a digital tuner unit that selects a digital modulation signal having a predetermined frequency from radio waves of a digital television broadcast, demodulates the digital modulation signal, and outputs a first digital signal. Selecting an analog modulation signal having a predetermined frequency from radio waves of analog television broadcasting, detecting the analog modulation signal and outputting a video signal and an audio signal; A digital conversion unit that performs compression encoding processing to generate video data and audio data, multiplexes the video data and audio data, and outputs a second digital signal; a first digital signal; a second digital signal; A switching unit that selectively outputs one of the first and second digital signals selected by the switching unit A tuner module, characterized in that it comprises an interface for exchanging one of the digital signals of the signal with an external device.

  As described above, the present invention selects a digital modulation signal having a predetermined frequency from radio waves of digital television broadcasting, demodulates the digital modulation signal, and outputs a first digital signal. A video signal and audio data are generated by selecting an analog modulation signal having a predetermined frequency and performing a predetermined compression encoding process on the video signal and the audio signal obtained by detecting the analog modulation signal. The audio data is multiplexed to output a second digital signal, one of the first digital signal and the second digital signal is selectively output by the switching unit, and the first and second selected by the switching unit are output. Since one of the digital signals is exchanged with an external device, it can be used for digital television broadcasting. It is possible to view the analog television broadcasting in only the corresponding electronic equipment.

  According to the present invention, an analog signal of an analog television broadcast is converted into a digital signal of a digital television broadcast format and supplied to an electronic device. Therefore, the analog television is an electronic device having only a digital television broadcast decoder. You can watch John Broadcasting.

  Hereinafter, an embodiment of the present invention will be described. The present invention converts an analog television broadcast video signal and an audio signal into a digital television broadcast format digital signal so that the analog television broadcast can be viewed on an electronic device only compatible with the digital television broadcast. did. Here, a case will be described in which a tuner module capable of receiving digital television broadcasting and analog television broadcasting is connected to an electronic device capable of displaying video such as a PC or a PDA. In the following description, a tuner module equipped with a terrestrial digital television broadcast tuner and a terrestrial analog television broadcast tuner will be described as an example.

  In this example, in order to simplify the explanation, it is assumed that radio waves of terrestrial digital television broadcasting and terrestrial analog television broadcasting are transmitted from one broadcasting facility.

  FIG. 1 shows an example of the configuration of a tuner module 1 and an electronic device 2 that can be applied to an embodiment of the present invention. First, the configuration of the tuner module 1 will be described. The tuner module 1 receives digital television broadcasts and analog television broadcasts, and converts the analog signals of the received analog television broadcasts into digital signals in the digital television broadcast format. Then, a first digital signal that is a digital signal of digital television broadcasting and a second digital signal obtained by converting an analog television broadcasting signal can be switched and output.

  The tuner module 1 includes a digital tuner unit 10, an analog tuner unit 11, a digital conversion unit 12, a switching unit 13, a control unit 14, a RAM 15, and a digital communication interface 16. The tuner module 1 is connected to an external antenna 3 and receives radio waves of digital television broadcasting and analog television broadcasting transmitted from the broadcasting facility 4. The received digital television broadcast radio wave is supplied to the digital tuner unit 10, and the analog television broadcast radio wave is supplied to the analog tuner unit 11.

  The digital tuner unit 10 performs predetermined signal processing such as demodulation and error correction on the supplied digital television broadcast radio wave and outputs a TS. The TS output from the digital tuner unit 10 is supplied to the input terminal 13 a of the switching unit 13.

  On the other hand, the analog tuner unit 11 selects a signal of a predetermined frequency from the supplied analog television broadcast radio wave, extracts a video signal and an audio signal from the selected signal, and supplies them to the digital conversion unit 12. The digital conversion unit 12 performs predetermined signal processing on the supplied video signal and audio signal, converts the signal into a TS format, and outputs it. The TS output from the digital conversion unit 12 is supplied to the input terminal 13 b of the switching unit 13.

  FIG. 2 shows an exemplary configuration of the digital tuner unit 10. The digital tuner unit 10 includes a channel selection unit 40, a demodulation unit 41, and an error correction processing unit 42, and each unit is controlled by the control unit 14 described later. The channel selection unit 40 selects a modulation signal having a predetermined frequency from the radio wave of the digital television broadcast supplied from the antenna 3 and supplies it to the demodulation unit 41. The demodulator 41 performs a demodulation process based on a predetermined method for the modulated signal supplied from the channel selector 40. As a demodulation method, for example, in the case of terrestrial digital television broadcasting, the OFDM method is used. The demodulated TS is supplied to the error correction processing unit 42. The error correction processing unit 42 performs error correction processing on the TS supplied from the demodulation unit 41 and outputs the TS.

  FIG. 3 shows an exemplary configuration of the analog tuner unit 11. The analog tuner unit 11 includes a channel selection unit 50, a video detection unit 51, and an audio detection unit 52, and each unit is controlled by the control unit 14 described later. The channel selection unit 50 selects a signal having a predetermined frequency from the radio waves of the analog television broadcast supplied from the antenna 3, and converts the selected signal into a video intermediate frequency signal having a predetermined frequency. The obtained video intermediate frequency signal is supplied to the video detector 51 and the audio detector 52.

  The video detection unit 51 AM detects the video intermediate frequency signal supplied from the channel selection unit 50 and extracts a video signal. The extracted video signal is supplied to the digital conversion unit 12. The audio detection unit 52 extracts the audio intermediate frequency signal from the video intermediate frequency signal supplied from the channel selection unit 50, and then performs FM detection to extract the audio signal. The extracted audio signal is supplied to the digital conversion unit 12.

  FIG. 4 shows an exemplary configuration of the digital conversion unit 12. The digital conversion unit 12 includes a video decoder 53, a video encoding unit 54, an A / D conversion unit 55, an audio encoding unit 56, and a MUX (MUltipleXer) unit 57, and each unit is controlled by the control unit 14 described later. The video decoder 53 performs signal processing such as color demodulation on the video signal supplied from the analog tuner unit 11 and extracts a luminance signal and a color difference signal. The luminance signal and the color difference signal are supplied to the video encoding unit 54.

  The video encoding unit 54 performs predetermined compression encoding processing on the supplied luminance signal and color difference signal, and outputs video data. As the compression encoding method, for example, the MPEG-2 method is used. In addition, for example, when viewing terrestrial digital television broadcasting on a portable terminal such as a PDA or a cellular phone, H.P. H.264 / AVC (H.264 / Advanced Video Coding) may be used. The compression-coded video data is supplied to the MUX unit 57.

  On the other hand, the A / D converter 55 converts the supplied audio signal into a digital audio signal. The converted digital audio signal is supplied to the audio encoding unit 56. The audio encoding unit 56 performs a predetermined compression encoding process on the supplied digital audio signal and outputs audio data. For example, in the case of terrestrial digital television broadcasting, the MPEG-2 AAC (MPEG-2 Advanced Audio Coding) method is used as the compression encoding method. The compression-coded audio data is supplied to the MUX unit 57.

  The MUX unit 57 divides the compressed and encoded video data supplied from the video encoding unit 54 and the compressed and encoded audio data supplied from the audio encoding unit 56 into a plurality of TS packets. Then, the MUX unit 57 adds information such as PID indicating the attribute of the TS packet to each TS packet as a TS header similar to the format of the digital television broadcast, and multiplexes the TS packet to generate a TS. . The generated TS is supplied to the input terminal 13b of the switching unit 13.

  Returning to FIG. 1, the control unit 14 controls each unit of the tuner module 1 based on a command from a CPU 25 of the electronic device 2 described later. In addition, the control unit 14 uses the RAM 15 as a work memory when executing the program.

  The switching unit 13 selects the input terminal 13 a or 13 b based on the control of the control unit 14. The TS supplied to the selected input terminal is supplied to the digital communication interface 16. The digital communication interface 16 controls communication with the connected electronic device 2 and supplies the TS supplied from the switching unit 13 to the electronic device 2.

  Next, an example of the configuration of the electronic device 2 will be described. The electronic device 2 performs predetermined signal processing such as descrambler and decoding on the TS supplied from the tuner module 1, selects a predetermined channel according to a user's operation, displays video, and outputs audio. I do.

  The electronic device 2 includes a descrambler 20, a DeMUX unit 21, a decoder 22, a display unit 23, an audio output unit 24, a CPU 25, a ROM 26, a RAM 27, an operation unit 28, and a digital communication interface 29. The digital communication interface 29 controls communication with the connected tuner module 1 and supplies the TS supplied from the tuner module 1 to the descrambler 20.

  The descrambler 20 performs processing for descrambling the TS supplied via the digital communication interface 29 as necessary, and supplies it to the DeMUX unit 21. Since the TS converted from the analog television broadcast signal has not been scrambled, when this TS is supplied to the descrambler 20, the descrambler 20 passes the supplied TS directly to the DeMUX unit 21. Supply.

  The DeMUX unit 21 performs filtering based on the value of the PID stored in the header part of the TS packet, extracts a necessary stream from the multiplexed TS, and supplies it to the decoder 22.

  The decoder 22 performs a decoding process on the video data, audio data, and additional data included in the stream supplied from the DeMUX unit 21. The decoder 22 includes a video decoder 30 that decodes the video data, an audio decoder 31 that decodes the audio data, and a data decoder 33 that decodes the additional data. Output additional data. The decoded video data and additional data are supplied to the display unit 23 and displayed. The additional data can be displayed superimposed on the video by, for example, OSD processing. As the display unit 23, for example, a CRT (Cathode Ray Tube) or an LCD (Liquid Crystal Display) is used. Also, the decoded audio data is supplied to the audio output unit 24 to output audio.

  The operation unit 28 includes, for example, a keyboard, and inputs selection information for digital television broadcasting or analog television broadcasting and channel selection information for selecting a channel. The input channel selection information is supplied to the CPU 25.

  The CPU 25 controls each unit of the electronic device 2 according to a program stored in advance in the ROM 26 and controls the control unit 14 of the tuner module 1 via the digital communication interface 29. The CPU 25 has a RAM 27 and is used as a work memory when executing the program. For example, the CPU 25 controls the control unit 14 and the DeMUX unit 21 of the tuner module 1 to select a signal having a predetermined frequency based on the channel selection information supplied from the operation unit 28.

  In this way, by converting an analog television broadcast analog signal into a digital television broadcast format digital signal, an electronic device compatible with the digital television broadcast can not only view the digital television broadcast but also the analog television broadcast. You can watch John Broadcasting.

  In addition, although the example in the case of receiving terrestrial analog television broadcasting was demonstrated above, this is not restricted to this example. For example, the present invention can be applied to the case of receiving an analog satellite broadcast such as a BS analog television broadcast or a CS analog television broadcast.

  Also, for example, an analog television broadcast tuner module excluding a circuit for receiving digital television broadcast from the above-mentioned tuner module, a digital television broadcast tuner module excluding a circuit for receiving analog television broadcast, etc. are prepared. By using these tuner modules according to the user's needs, the corresponding television broadcasts can be viewed as electronic devices dedicated to analog television broadcasts, digital television broadcasts, and analog / digital television broadcasts. can do.

  The embodiment of the present invention has been specifically described above, but the present invention is not limited to the above-described embodiment, and various modifications based on the technical idea of the present invention are possible. . For example, an analog communication interface may be further provided in the tuner module 1 described above, and a video signal and an audio signal may be input from the outside via the analog communication interface and supplied to the digital conversion unit 12. For example, by connecting an analog communication interface of an analog VTR (Video Tape Recorder) and an analog communication interface of a tuner module, an electronic device can generate an image based on a video signal and an audio signal recorded on a recording medium such as a video tape. And can output audio.

  Further, for example, the analog tuner unit 12 may be provided outside, and the video signal and the audio signal output from the analog tuner unit 12 may be input from the outside via the analog communication interface.

  In this example, the external antenna 4 is used to receive digital television broadcast radio waves, but this is not limited to this example. For example, the tuner module 1 may incorporate an antenna and receive radio waves using the built-in antenna.

It is a block diagram which shows the structure of an example of the tuner module and electronic device which can be applied to one Embodiment of this invention. It is a block diagram which shows the structure of an example of a digital tuner part. It is a block diagram which shows the structure of an example of an analog tuner part. It is a block diagram which shows the structure of an example of a digital converter. It is a block diagram which shows the structure of an example of the conventional tuner module and an electronic device. It is a basic diagram which shows the structure of an example of a transport stream.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tuner module 2 Electronic device 10 Digital tuner part 11 Analog tuner part 12 Digital conversion part 13 Switching part 14 Control part 16 Digital communication interface 20 Descrambler 21 DeMUX part 22 Decoder 23 Display part 24 Audio | voice output part 50 Tuning part 51 Video | video detection part 52 Audio Detector 53 Video Decoder 54 Video Encoder 55 A / D Converter 56 Audio Encoder 57 MUX Unit

Claims (4)

A digital tuner unit that selects a digital modulation signal having a predetermined frequency from radio waves of digital television broadcasting, demodulates the digital modulation signal, and outputs a first digital signal;
An analog tuner unit that selects an analog modulation signal of a predetermined frequency from an analog television broadcast radio wave, detects the analog modulation signal, and outputs a video signal and an audio signal;
A digital converter that performs predetermined compression encoding processing on the video signal and the audio signal to generate video data and audio data, multiplexes the video data and audio data, and outputs a second digital signal; ,
A switching unit that selectively outputs one of the first digital signal and the second digital signal;
A tuner module comprising: an interface for exchanging one of the first and second digital signals selected by the switching unit with an external device. The tuner module according to claim 1,
The digital conversion unit divides the video data and audio data into a plurality of packets when multiplexing the video data and audio data, and adds a header indicating packet information to the packets. Tuner module characterized by that. The tuner module according to claim 1,
The tuner module, wherein the predetermined compression encoding is decoded by a video decoder and an audio decoder provided in the external device. The tuner module according to claim 1,
The tuner module, wherein the first and second digital signals are decoded by a decoder included in the external device, which is common to the first and second digital signals.

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