JP2007235650A - Tuner module and broadcast receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To view digital television broadcast and analog television broadcast by video equipment corresponding only to the digital television broadcast. <P>SOLUTION: This tuner module receives radiowaves of the digital television broadcast, supplies the radiowaves to a digital tuner, receives radiowaves of the analog television broadcast and supplies the radiowaves to an analog tuner. The digital tuner supplies a TS obtained by selecting a predetermined signal from the radiowaves of the digital television broadcast and performing signal processing to it to a multiplexing part. On the other hand, the analog tuner part supplies a video signal and a sound signal obtained by selecting a predetermined signal from the radiowaves of the analog television broadcast and performing signal processing to it to a digital conversion part. The digital conversion part performs compression coding to the video signal and the sound signal, converts the signals into the TS by multiplexing them and supplies the TS to the multiplexing part. The multiplexing part multiplexes the two supplied TSs to supply them to the video equipment. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

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

  In recent years, the provision of digital terrestrial television broadcasting has started, and since digital television broadcasting will become the mainstream in the future, it is considered that television receivers and tuners compatible with digital television broadcasting will rapidly spread. Further, with the spread of digital television broadcasting, analog television broadcasting is moving in the direction of stopping.

  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.

  In addition, devices such as VTR (Video Tape Recorder) and DVD (Digital Versatile Disc) that are already in widespread use are expected to be used for a while after the analog television broadcast stops. The output of these devices is output as a signal based on analog television broadcasting standards such as NTSC (National Television System Committee). Therefore, it is considered that a function for reproducing an analog signal is required for a television receiver and a tuner even after the analog broadcast is stopped.

  At present, digital television broadcast-compatible television receivers, PCs (Personal Computers), PDAs (Personal Digital Assistants), etc. are digitally broadcast so that both digital television broadcasts and analog television broadcasts can be viewed. Many of them are equipped with a processing circuit for television broadcasting and a processing circuit 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 conventional tuner module and video apparatus capable of receiving digital television broadcasting and analog television broadcasting will be schematically described. Here, a case where a tuner module equipped with a digital television broadcast tuner and an analog television broadcast tuner is connected to a video apparatus equipped with a decoder corresponding to each broadcast will be described as an example.

  FIG. 13 shows an exemplary configuration of a conventional tuner module 401 and video apparatus 402. The digital communication interface (I / F) 419 of the tuner module 401 and the digital communication interface 432 of the video device 402 are connected, and the analog communication interface 420 of the tuner module 401 and the analog communication interface 440 of the video device 402 are connected.

  The tuner module 401 is connected to an external antenna 403 and receives radio waves of digital television broadcasting and / or analog television broadcasting transmitted from the broadcasting facility 404. The received digital television broadcast radio wave is supplied to the digital tuner unit 411, and the analog television broadcast radio wave is supplied to the analog tuner unit 412.

  In the broadcasting facility 404, 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 digital terrestrial television broadcasting, unlike the satellite digital television broadcasting, it is necessary to consider the reflected wave due to mountains, buildings, etc., so that the modulation method is OFDM (Orthogonal Frequency Division Multiplex) that is resistant to multipath interference. A modulation scheme is used.

  For example, in the case of terrestrial analog television broadcasting, the broadcasting facility 404 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. 14 shows the structure of TS. The TS is composed of TS packets as shown in FIG. 14A. The TS packet is a fixed-length packet of 188 bytes, and includes a TS header, a payload, and / or an adaptation field as shown in FIG. 14B. As shown in FIG. 14C, the TS header of the TS packet includes a synchronization byte for detecting the head of the TS packet, an error indication 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 payload data.

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

  The payload of the TS packet can store a packetized video or audio stream of a plurality of channels. In addition to video and audio streams, section format data can also be stored. The section format data includes, for example, information on channels and programs, and specifically includes, for example, a PMT (Program Map Table) and a PAT (Program Association Table) described later.

  The PMT is a table for specifying TS packets that transmit video, audio, and data streams in each channel. The PMT exists for each channel, and designates the PID of each stream constituting the channel, the stream type, and the like. The PID of the PMT itself is specified by a PAT described later.

  The PAT is a table for specifying a TS packet transmitting the PMT of each channel. One PAT exists in the TS, and the service ID existing in the TS, the PID of the PMT of the service, and the like are described.

  Returning to FIG. 13, the digital tuner unit 411 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 411 is supplied to the digital communication interface 419 and supplied to the video device 402 via the digital communication interface 432 of the video device 402 connected to the digital communication interface 419.

  On the other hand, the analog tuner unit 412 selects a signal of 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 420 and are supplied to the video device 402 via the analog communication interface 440 of the video device 402 connected to the analog communication interface 420.

  The TS supplied to the video apparatus 402 via the digital communication interface 432 is supplied to the descrambler 421. The descrambler 421 performs processing for releasing the scramble and supplies it to a DeMUX (De-MUltipleXer) unit 422. The DeMUX unit 422 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 digital decoder 424.

  The digital decoder 424 subjects the video data, audio data, and additional data included in the stream supplied from the DeMUX unit 422 to decoding processing according to the respective data, and outputs the video signal, audio signal, and additional data. . The decoded video signal and additional data are supplied to the display unit 426. The additional data is supplied to the display unit 426, 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 427.

  On the other hand, the video signal and audio signal supplied to the video device 402 via the analog communication interface 440 are supplied to the analog decoder 450. The analog decoder 450 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 426, and the audio signal is supplied to the audio output unit 427.

  The display unit 426 switches and displays the video signal supplied from the digital decoder 424 and the analog decoder 450 according to a user request. The audio output unit 427 switches and outputs the audio signal supplied from the analog decoder 450 and the digital decoder 424 according to a user request.

  The operation unit 431 includes a keyboard, for example, and outputs channel selection information corresponding to an operation such as a user selecting a channel. The channel selection information output from the operation unit 431 is supplied to a CPU (Central Processing Unit) 428.

  The CPU 428 controls each unit of the video device 402 according to a program stored in advance in a ROM (Read Only Memory) 429 and also controls each unit of the tuner module 401 via the digital communication interface 432. The CPU 428 has a RAM (Random Access Memory) 430 and is used as a work memory when executing the program. For example, the CPU 428 controls the digital tuner unit 411 and the analog tuner unit 412 so as to select a signal having a predetermined frequency based on the channel selection information supplied from the operation unit 431.

  As described above, in the tuner module and the video apparatus that can receive the conventional digital television broadcast and analog television broadcast, the digital television broadcast signal and the analog television broadcast signal are processed through independent paths, respectively. Thus, the digital television broadcast and the analog television broadcast can be viewed.

  However, as described above, the video signal and the audio signal output from the analog television broadcast tuner cannot be transmitted using the digital communication interface. For this reason, an analog communication interface is required to supply such an analog signal to the video apparatus. 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.

  Further, when viewing both digital television broadcast and analog television broadcast, the video apparatus 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 in that it is expensive and affects the miniaturization of the video apparatus.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a tuner module and a broadcast receiving apparatus capable of simultaneously viewing and / or recording a digital television broadcast and an analog television broadcast with a video apparatus that supports only a digital television broadcast. It is in.

  In order to solve the above-described problems, a first 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 digital signal that performs predetermined compression encoding processing on the analog video signal and the analog audio signal to generate video data and audio data, multiplexes the video data and audio data, and outputs a second digital signal A conversion unit; a multiplexing unit that multiplexes the first digital signal and the second digital signal and outputs a third digital signal; and exchange of the third digital signal output from the multiplexing unit. It is a tuner module characterized by having an interface with a device.

  According to a second aspect of the present invention, there is provided 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 video signal; A digital converter that performs predetermined compression encoding processing on the analog audio signal to generate video data and audio data, multiplexes the video data and audio data, and outputs a second digital signal; A multiplexing unit that multiplexes the digital signal and the second digital signal and outputs a third digital signal; and a separation unit that separates the third digital signal into a first digital signal and a second digital signal; Any one of the first digital signal and the second digital signal is supplied, and the digital signal is supplied. The video signal and audio data are separated, a decoder for decoding each data, and one of the first digital signal and the second digital signal is supplied, and the digital signal is A broadcast receiving apparatus comprising: a recording / reproducing unit that records on a recording medium and reproduces a digital signal recorded on the recording medium.

  As described above, according to the first and second inventions, the first digital signal obtained by selecting a digital modulation signal having a predetermined frequency from radio waves of digital television broadcasting and demodulating the digital modulation signal, and the analog signal The analog video signal and analog audio signal output from the output unit are converted into video data and audio data, respectively, and multiplexed with the second digital signal obtained by multiplexing, so that digital television broadcasting is possible. Analog television broadcasts can be viewed and / or recorded with devices that only support them.

  The present invention multiplexes a first digital signal which is a digital signal of a digital television broadcast and a second digital signal obtained by converting an analog signal of an analog television broadcast into a digital signal of a digital television broadcast format. Since it is supplied to the apparatus, the digital television broadcast and the analog television broadcast can be viewed and / or recorded at the same time by a video apparatus equipped with a decoder and recording / playback unit that supports only digital television broadcast. There is an effect.

  Hereinafter, an embodiment of the present invention will be described. The present invention converts a video signal and an audio signal of an analog television broadcast into a digital signal of a digital television broadcast format, and multiplexes the digital signal with a digital signal of the digital television broadcast so that the video is compatible only with the digital television broadcast. In the apparatus, analog television broadcasting and digital television broadcasting can be simultaneously viewed and / or recorded.

  Here, as an example, consider a case where a tuner module capable of receiving digital television broadcasting and analog television broadcasting and multiplexing and outputting the same is connected to a video apparatus capable of simultaneously viewing and recording. . In this example, it is assumed that radio waves of digital television broadcasting and analog television broadcasting are transmitted from one broadcasting facility in order to simplify the description.

  FIG. 1 shows an example of the configuration of a tuner module 1 and a video apparatus 2 that can be applied to an embodiment of the present invention. First, the configuration of the tuner module 1 applicable to this embodiment 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. The first digital signal, which is a digital signal for digital television broadcasting, and the second digital signal obtained by converting the signal for analog television broadcasting can be multiplexed and output.

  The tuner module 1 includes a digital tuner unit 11, an analog tuner unit 12, a switching unit 13, a digital conversion unit 14, a multiplexing unit 15, analog input terminals 16a and 16b, a control unit 17, a RAM (Packet IDentification) 18, and a digital communication interface. (I / F) 19 is provided. Further, an external antenna 3 is connected to the tuner module 1 and receives radio waves of digital television broadcast and analog television broadcast transmitted from the broadcast facility 4. The received digital television broadcast radio wave is supplied to the digital tuner unit 11, and the analog television broadcast radio wave is supplied to the analog tuner unit 12.

  The digital tuner unit 11 performs predetermined signal processing such as demodulation and error correction on the supplied digital television broadcast radio wave and outputs a TS (Transport Stream). Details of the digital tuner unit 11 will be described later. The TS output from the digital tuner unit 11 is supplied to the multiplexing unit 15.

  The analog tuner unit 12 selects a signal having a predetermined frequency from the supplied analog television broadcast radio wave, and extracts a video signal and an audio signal from the selected signal. Details of the analog tuner unit 12 will be described later. The extracted video signal and audio signal are supplied to the input terminals 13a and 13b of the switching unit 13, respectively.

  The analog input terminals 16a and 16b can respectively input a video signal and an audio signal from the outside. The video signal and the audio signal supplied from the outside are supplied to the input terminals 13c and 13d of the switching unit 13, respectively.

  The switching unit 13 switches between the video signal and the audio signal supplied from the analog tuner unit 12 and the video signal and the audio signal supplied from the analog input terminals 16a and 16b based on the control by the control unit 17, and the digital conversion unit 14. At this time, the control unit 17 controls the switching of the selected video signal and audio signal so that they are linked to each other. The digital conversion unit 14 performs predetermined signal processing on the supplied video signal and audio signal, converts the video signal and audio signal into TS having the same format as that of digital television broadcasting, and outputs the TS. The TS output from the digital conversion unit 14 is supplied to the multiplexing unit 15. Details of the digital conversion unit 14 will be described later.

  The multiplexing unit 15 multiplexes the TS supplied from the digital tuner unit 11 and the TS supplied from the digital conversion unit 14. Further, in order to avoid duplication of PID (Packet IDentification) between the TS from the digital tuner unit 11 and the TS from the digital conversion unit 14, the PID of the TS from the digital tuner unit 11 is required at the time of multiplexing. Change accordingly. Details of the multiplexing unit 15 will be described later. The multiplexed TS is supplied to the digital communication interface 19.

  The control unit 17 controls each unit of the tuner module 1 based on a command from a CPU (Central Processing Unit) 28 of the video apparatus 2 described later. In addition, the control unit 17 uses the RAM 18 as a work memory when executing the program.

  The digital communication interface 19 controls communication with the connected video apparatus 2. The digital communication interface 19 supplies the TS supplied from the multiplexing unit 15 to the video apparatus 2 via the digital communication interface 32 described later. Further, the digital communication interface 19 supplies a command to the control unit 17 supplied from the video device 2 and information supplied from the control unit 17 to the video device 2.

  The digital communication interface 19 may be any interface that can transmit and receive digital signals. For example, as the digital communication interface 19, PCI (Peripheral Component Interconnect), USB (Universal Serial Bus), or the like may be used. Furthermore, the tuner module 1 is not limited to a configuration that is mounted / removed outside the casing of the video apparatus 2, and may be a configuration that can be inserted into a slot as an interface inside the casing of the video apparatus 2, for example.

  Next, each part of the tuner module 1 will be described in detail with reference to the drawings. FIG. 2 shows an example of the configuration of the digital tuner unit 11. The digital tuner unit 11 includes a channel selection unit 41, a demodulation unit 42, and an error correction processing unit 43, and each unit is controlled by the control unit 17. The channel selection unit 41 selects a modulation signal having a predetermined frequency from the radio wave of digital television broadcast supplied from the external antenna 3 and supplies it to the demodulation unit 42. The demodulator 42 performs demodulation processing based on a predetermined method on the modulated signal supplied from the channel selector 41 to obtain a TS. As a demodulation method, for example, in the case of terrestrial digital television broadcasting, an OFDM (Orthogonal Frequency Division Multiplex) method is used. The TS obtained by demodulation is supplied to the error correction processing unit 43. The error correction processing unit 43 performs error correction processing on the TS supplied from the demodulation unit 42 and outputs the TS.

  FIG. 3 shows an exemplary configuration of the analog tuner unit 12. The analog tuner unit 12 includes a channel selection unit 51, a video detection unit 52, and an audio detection unit 53, and each unit is controlled by the control unit 17. The channel selection unit 51 selects a signal having a predetermined frequency from the analog television broadcast radio wave supplied from the external 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 52 and the audio detector 53.

  The video detection unit 52 performs AM (Amplitude Modulation) detection on the video intermediate frequency signal supplied from the channel selection unit 51 and extracts a video signal. The extracted video signal is supplied to the input terminal 13a of the switching unit 13. The audio detection unit 53 extracts an audio intermediate frequency signal from the video intermediate frequency signal supplied from the channel selection unit 51, and then performs FM (Frequency Modulation) detection to extract the audio signal. The extracted audio signal is supplied to the input terminal 13b of the switching unit 13.

  FIG. 4 shows an exemplary configuration of the digital conversion unit 14. The digital conversion unit 14 includes a video decoder 61, a video encoding unit 62, an A / D (Analog / Digital) conversion unit 63, an audio encoding unit 64, and a MUX (MUltipleXer) unit 65. Each unit is controlled by the control unit 17. Be controlled. The video decoder 61 performs signal processing such as color demodulation on the video signal supplied from the switching unit 13 and extracts a luminance signal and a color difference signal. The extracted luminance signal and color difference signal are supplied to the video encoding unit 62. The video encoding unit 62 performs predetermined compression encoding processing on the luminance signal and the color difference signal supplied from the video decoder 61, and outputs video data. As the compression encoding method, for example, MPEG-2 (Moving Picture Experts Group-2) method is used. Further, for example, when viewing terrestrial digital television broadcasting with 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 65.

  The A / D converter 63 converts the supplied audio signal into a digital audio signal. The converted digital audio signal is supplied to the audio encoding unit 64. The audio encoding unit 64 performs a predetermined compression encoding process on the digital audio signal supplied from the A / D conversion unit 63 and outputs audio data. As a compression encoding method, for example, in the case of terrestrial digital television broadcasting, an MPEG-2 AAC (MPEG-2 Advanced Audio Coding) method is used. The compressed and encoded audio data is supplied to the MUX unit 65.

  The MUX unit 65 divides the compressed and encoded video data supplied from the video encoding unit 62 and the compressed and encoded audio data supplied from the audio encoding unit 64 into a plurality of TS packets. Then, the MUX unit 65 adds information such as PID indicating the attribute of the TS packet to each TS packet as a TS header similar to the digital television broadcasting system, and multiplexes the TS packets to generate a TS. To do. The generated TS is supplied to the multiplexing unit 15.

  FIG. 5 shows an exemplary configuration of the multiplexing unit 15. In digital television broadcasting, TS packets for a plurality of channels may exist in a TS having a selected frequency. Further, the PID added to the TS packet of each channel can be freely set on the broadcast station side. Therefore, there is a possibility that the PID added to the TS packet in the TS of the digital television broadcast and the PID added to the TS packet in the TS obtained by converting the analog television broadcast signal into the digital television broadcast format may overlap. is there.

  If the PIDs of these two TS packets overlap, the DeMUX unit 22 described later cannot properly extract the target channel. Therefore, the multiplexing unit 15 extracts the TS packet of the desired channel from the selected frequency TS, changes the PID of the extracted TS packet, and the PIDs of the two TSs overlap. Try to avoid.

  The multiplexing unit 15 includes a configuration information extraction unit 71, a PID extraction change unit 72, and a secondary MUX unit 73, and each unit is controlled by the control unit 17. The configuration information extraction unit 71 extracts a TS packet of a desired channel from the TS supplied from the digital tuner unit 11, and extracts configuration information regarding the TS packet of the desired channel from the additional data stored in the TS packet. Specifically, for example, the configuration information extraction unit 71 extracts each TS packet storing video data and audio data of a desired channel based on the PAT and PMT stored in the TS packet. Then, information on the PID assigned to the extracted TS packet is extracted as configuration information. The extracted configuration information is supplied to the control unit 17.

  The PID extraction / change unit 72 changes the PID of the TS packet of a desired channel based on the change value of the PID calculated based on the configuration information in the control unit 17. The secondary MUX unit 73 multiplexes the TS whose PID has been changed by the PID change extraction unit 72 and the TS supplied from the digital conversion unit 14. The multiplexed TS is supplied to the digital communication interface 19.

  If the PID of the TS packet in the TS supplied from the digital tuner unit 11 and the PID of the TS packet in the TS supplied from the digital conversion unit 14 do not overlap, the TS is supplied from the digital tuner unit 11. The TS packet may be multiplexed as it is without changing the PID of the TS packet.

  When only one of the TS supplied from the digital tuner unit 11 and the TS supplied from the digital conversion unit 14 is supplied, the multiplexing unit 15 does not multiplex the TS. Alternatively, it may be output as it is.

  Next, the configuration of the video apparatus 2 applicable to this embodiment will be described. The video device 2 performs predetermined signal processing such as descrambling and decoding on the TS supplied from the tuner module 1, selects a predetermined channel in accordance with a user operation, and displays and records video. Do. Specific examples of the video apparatus 2 include a portable PC (so-called notebook PC), a PDA, a mobile phone, and a portable music player.

  The video apparatus 2 includes a descrambler 21, a DeMUX (De-MUltipleXer) unit 22 as a separation unit, a recording / playback unit 23, a decoder 24, a CAS (Conditional Access System) module 25, a display unit 26, an audio output unit 27, a CPU 28, A ROM (Read Only Memory) 29, a RAM 30, an operation unit 31, and a digital communication interface (I / F) 32 are included. The digital communication interface 32 controls communication with the connected tuner module 1. The digital communication interface 32 supplies the TS supplied from the tuner module 1 to the descrambler 21. Further, the digital communication interface 32 supplies information received from the control unit 17 of the tuner module 1 to the CPU 28 and supplies instructions received from the CPU 28 to the tuner module 1.

  As the digital communication interface 32, any interface can be used as long as it is an interface capable of transmitting and receiving digital signals, like the digital communication interface 19 described above.

  The descrambler 21 exchanges data with the CAS module 25 as necessary for the TS supplied via the digital communication interface 32, and performs descrambling processing for releasing scramble. The descrambling process will be described later. The descrambled TS is supplied to the DeMUX unit 22. When the TS is obtained by converting only an analog television broadcast signal, the signal is not scrambled with respect to the TS. Therefore, when only the TS converted from the analog television broadcast is supplied, the descrambler 21 outputs the supplied TS as it is without performing the process for releasing the scramble.

  The CAS module 25 is a module used when the descrambler 21 performs descrambling processing. The CAS module 25 determines whether or not the user can view the program based on information supplied from the descrambler 21. The CAS module 25 receives the encrypted scramble key used in the scramble process from the descrambler 21, decrypts the scramble key, and supplies the decrypted scramble key to the descrambler 21. As the CAS module 25, for example, an IC (Integrated Circuit) card can be used.

  The DeMUX unit 22 performs filtering based on the PID value stored in the header part of the TS packet, and separates the stream into a digital television broadcast stream and a stream obtained by converting an analog television broadcast signal into a digital television broadcast format. To do. Based on the control of the CPU 28, one of these two streams is supplied to the decoder 24, and the other stream is supplied to the recording / playback unit 23.

  The recording / reproducing unit 23 records the stream supplied from the DeMUX unit 22 on a recording medium capable of recording digital data. The recording / playback unit 23 reads a stream recorded on the recording medium and supplies the read stream to the decoder 24. Details of the recording / reproducing unit 23 will be described later.

  The decoder 24 performs a decoding process on the video data, audio data, and additional data included in the stream supplied from the DeMUX unit 22 or the recording / playback unit 23. Details of the decoder 24 will be described later. The decoded video data and additional data are supplied to the display unit 26, and are superimposed and displayed by, for example, OSD (On Screen Display) processing. As the display unit 26, for example, a CRT (Cathode Ray Tube) or an LCD (Liquid Crystal Display) is used. The decoded audio data is supplied to the audio output unit 27 to output audio.

  The operation unit 31 includes, for example, a keyboard and a remote control commander, and selection information for digital television broadcasting or analog television broadcasting and channel selection information are input by the user. The input selection information and channel selection information are supplied to the CPU.

  The CPU 28 controls each unit of the video apparatus 2 using the RAM 30 as a work memory at the time of program execution according to a program stored in advance in the ROM 29, and controls the control unit 17 of the tuner module 1 via the digital communication interface 32. For example, the CPU 28 controls the control unit 17 and the DeMUX unit 22 of the tuner module 1 to select a signal having a predetermined frequency based on the channel selection information supplied from the operation unit 31.

  Next, each part of the video apparatus 2 will be described in detail with reference to the drawings. FIG. 6 shows an exemplary configuration of the recording / reproducing unit 23. The recording / playback unit 23 includes an encryption unit 81, a recording medium 82, and a decryption unit 83, and each unit is controlled by the CPU 28. The encryption unit 81 applies encryption processing using a predetermined encryption method to the stream supplied from the DeMUX unit 22 for each one or a plurality of packets as necessary. As the encryption method, for example, a common key encryption method such as DES (Data Encryption Standard) or AES (Advanced Encryption Standard) can be used. The encrypted stream is supplied to the recording medium 82.

  The recording medium 82 records the stream supplied from the encryption unit 81. At the time of reproduction, the stream recorded on the recording medium 82 is read and supplied to the decoding unit 83. As the recording medium, for example, a recording medium capable of recording digital data such as an HDD (Hard Disc Drive) can be used.

  The decryption unit 83 performs a decryption process on the stream read from the recording medium 82 according to the encryption method used by the encryption unit 81. The decoded stream is supplied to the decoder 24.

  In the above-described example, the recording medium 82 is described as being built in the recording / reproducing unit 23, but this is not limited to this example. For example, the recording medium 82 may be provided outside so that it can be removed. As the removable recording medium 82, for example, a memory card, a recordable DVD (Digital Versatile Disc), or a recordable BD (Blu-ray Disc) can be used.

  FIG. 7 shows an exemplary configuration of the decoder 24. The decoder 24 includes a switching unit 91, a secondary DeMUX unit 92, a video decoder 93, an audio decoder 94, and a data decoder 95, and each unit is controlled by the CPU. The switching unit 91 switches between the stream from the DeMUX unit 22 input to the input terminal 91a and the stream from the recording / playback unit 23 input to the input terminal 91b based on the control of the CPU 28, and the secondary DeMUX unit 92. To supply. For example, under the control of the CPU 28, the input terminal 91a is selected when viewing digital television broadcasting or analog television broadcasting, and the input terminal 91b is selected when playing back a recorded program.

  The secondary DeMUX unit 92 separates the supplied stream into video data, audio data, and additional data. Video data, audio data, and additional data are supplied to a video decoder 93, an audio decoder 94, and a data decoder 95, respectively. The video decoder 93, the audio decoder 94, and the data decoder 95 decode the supplied video data, audio data, and additional data, respectively, and output the decoded video data and additional data to the display unit 26. Data is output to the audio output unit 27.

  Next, operations of the tuner module 1 and the video apparatus 2 applicable to the embodiment of the present invention will be described with reference to FIG. Here, for ease of explanation, a case where a digital television broadcast is viewed and an analog television broadcast is recorded will be described as an example.

  The antenna 3 connected to the outside of the tuner module 1 receives radio waves of digital television broadcast and analog television broadcast transmitted from the broadcasting facility 4 and supplies them to the digital tuner unit 11 and the analog tuner unit 12, respectively. The digital tuner unit 11 selects a modulation signal having a predetermined frequency from a digital television broadcast radio wave based on a channel selection operation by the user operation unit 31, and multiplexes a TS obtained by performing signal processing such as demodulation. To the conversion unit 15.

  On the other hand, the analog tuner unit 12 selects a signal having a predetermined frequency from the radio wave of the analog television broadcast based on the channel selection operation of the user operation unit 31, and converts the selected signal into a video intermediate frequency signal. A video signal and an audio signal obtained by performing predetermined signal processing are supplied to the digital conversion unit 14 via the switching unit 13. The digital conversion unit 14 performs predetermined signal processing on the video signal and the audio signal, converts the video signal and the audio signal into TS of a digital television broadcast format, and supplies the TS to the multiplexing unit 15.

  The multiplexing unit 15 first, as necessary, avoids duplication of the PID of the TS packet in the TS supplied from the digital tuner unit 11 and the PID of the TS packet in the TS supplied from the digital conversion unit 14. The PID of the TS packet in the TS from the digital tuner unit 11 is changed.

  The configuration information extraction unit 71 of the multiplexing unit 15 extracts a TS packet in which video data and audio data of a desired channel are stored based on the PAT and PMT stored in the TS packet. Then, the PID assigned to the extracted TS packet is extracted and supplied to the control unit 17 as configuration information. The control unit 17 calculates a PID to be newly added to the TS packet based on the supplied configuration information, and supplies the obtained PID change value to the PID extraction / change unit 72 of the multiplexing unit 15. .

  In the multiplexing unit 15, the PID extraction / change unit 72 changes the PID of the TS packet that is the PID change target based on the PID change value supplied from the control unit 17. Then, the secondary MUX unit 73 of the multiplexing unit 15 multiplexes the TS whose PID has been changed by the PID extraction / change unit 72 and the TS supplied from the digital conversion unit 14. The multiplexed TS is supplied to the video apparatus 2 via the digital communication interface 19 and the digital communication interface 32.

  The video apparatus 2 supplies the TS supplied via the digital communication interface 32 to the descrambler 21. The descrambler 21 performs descrambling processing for releasing the scramble on the supplied TS.

  In the additional data stored in the TS, the scramble key used when the scramble process is performed in the broadcasting facility 4 is stored in an encrypted state. The descrambler 21 extracts information on the TS and the encrypted scramble key from the additional data during the descrambling process, and supplies the information to the CAS module 25. The CAS module 25 determines whether or not the user is allowed to view the TS based on the information regarding the TS received from the descrambler 21. As a result of the determination, if it is determined that viewing is permitted, the CAS module 25 decrypts the encrypted scramble key and supplies it to the descrambler 21. Then, the descrambler 21 performs descrambling processing on the TS using the decrypted scramble key, and supplies it to the DeMUX unit 22.

  The DeMUX unit 22 extracts the digital television broadcast stream and the analog television broadcast converted stream from the descrambled TS, and supplies the digital television broadcast stream to the decoder 24. In addition, the DeMUX unit 22 supplies the stream obtained by converting the analog television broadcast to the recording / reproducing unit 23, encrypts it by the recording / reproducing unit 23, and records it on the recording medium 82.

  The decoder 24 performs a decoding process corresponding to each data on the video data, the audio data, and the additional data included in the supplied stream, outputs the video data and the additional data to the display unit 26, and outputs the audio data. Is output to the audio output unit 27.

  In this way, an analog signal of analog television broadcast is converted into a digital signal of digital television broadcast format and multiplexed with the digital signal of digital television broadcast, so that a decoder or digital recording only compatible with digital television broadcast can be used. Digital television broadcasts and analog television broadcasts can be viewed and / or recorded simultaneously using a recording / playback unit for playback.

  In the above description, the tuner module and the video apparatus are described as being separated, but this is not limited to this example. For example, the tuner module and the video device may be integrated.

  In addition, for example, a plurality of digital tuner units may be provided to view and / or record a plurality of digital television broadcasts and analog television broadcasts.

  Further, the configuration of the tuner module and the video apparatus is not limited to this example, and for example, as shown in FIGS. 8 and 9, a descrambler and a CAS module may be provided on the tuner module side.

  FIG. 8 shows an example of a configuration in the case where a descrambler 121 is provided after the multiplexing unit 15 of the tuner module 101. In addition, the same code | symbol is attached | subjected about the part which is common in FIG. 1, and description is abbreviate | omitted.

  In the digital tuner unit 11, predetermined signal processing is performed on the radio waves of the digital television broadcast received by the antenna 3 connected to the outside of the tuner module 101, and TS is extracted and supplied to the multiplexing unit 15. .

  Further, in the analog tuner unit 12, predetermined signal processing is performed on the radio waves of the analog television broadcast received by the external antenna 3, and video signals and audio signals are extracted. The extracted video signal and audio signal are supplied to the digital conversion unit 14 via the switching unit 13, and converted into a digital television broadcast format TS by the digital conversion unit 14. The converted TS is supplied to the multiplexing unit 15.

  In the multiplexing unit 15, the TS supplied from the digital tuner unit 11 and the TS supplied from the digital conversion unit 14 are multiplexed and supplied to the descrambler 121. From the multiplexed TS, the descrambler 121 extracts information about the TS and the encrypted scramble key, and supplies them to the CAS module 125.

  When the CAS module 125 determines that viewing is permitted based on the information regarding the TS received from the descrambler 121, the CAS module 125 decrypts the scramble key received from the descrambler 121 and supplies the decrypted key to the descrambler 121. To do. The descrambler 121 performs descrambling processing on the multiplexed TS with the decrypted scramble key, and supplies it to the video apparatus 102 via the digital communication interface 19 and the digital communication interface 32.

  The TS supplied to the video apparatus 102 via the digital communication interface 32 is subjected to the same processing as that described with reference to FIG. 1 in the DeMUX unit 22 and the decoder 24, and a digital television broadcast stream and analog television are processed. The John broadcast signal is separated into a stream converted into a digital television broadcast format. One stream is recorded on the recording / reproducing unit 23, the other stream is displayed on the display unit 26, and audio is output by the audio output unit 27.

  FIG. 9 shows an example of a configuration when a descrambler 221 is provided between the digital tuner unit 11 and the multiplexing unit 15 of the tuner module 201. The TS that has been subjected to the scramble processing is only a digital television broadcast TS. Therefore, in this example, the descramble processing is performed on the digital television broadcast TS before multiplexing the digital television broadcast TS and the TS obtained by converting the analog television broadcast signal into the digital television broadcast format. It was made to give. In addition, the same code | symbol is attached | subjected about the part which is common in FIG. 1, and description is abbreviate | omitted.

  In the digital tuner unit 11, predetermined signal processing is performed on radio waves of the digital television broadcast received by the antenna 3 connected to the outside of the tuner module 201, TS is extracted, and is output to the descrambler 221.

  From the TS output from the digital tuner unit 11, information related to the TS and the encrypted scramble key are extracted by the descrambler 221 and supplied to the CAS module 225.

  When the CAS module 225 determines that viewing is permitted based on the information regarding the TS received from the descrambler 221, the CAS module 225 decrypts the scramble key received from the descrambler 221 and supplies the decrypted key to the descrambler 221. To do. The descrambler 221 performs descrambling on the TS using the decrypted scramble key. The TS that has been descrambled is supplied to the multiplexing unit 15.

  On the other hand, in the analog tuner unit 12, predetermined signal processing is performed on the radio wave of the analog television broadcast received by the external antenna 3, and the video signal and the audio signal are extracted. The extracted video signal and audio signal are supplied to the digital conversion unit 14 via the switching unit 13, and converted into a digital television broadcast format TS by the digital conversion unit 14. The converted TS is supplied to the multiplexing unit 15.

  In the multiplexing unit 15, the TS supplied from the digital tuner unit 11 and the TS supplied from the digital conversion unit 14 are multiplexed and supplied to the video apparatus 202 via the digital communication interface 19 and the digital communication interface 32. The

  The TS supplied to the video apparatus 202 via the digital communication interface 32 is subjected to the same processing as that described with reference to FIG. 1 in the DeMUX unit 22 and the decoder 24, and the digital television broadcast stream and analog television are processed. The John broadcast signal is separated into a stream converted into a digital television broadcast format. One stream is recorded on the recording / reproducing unit 23, the other stream is displayed on the display unit 26, and audio is output by the audio output unit 27.

  Next, a modification of the embodiment of the present invention will be described with reference to FIG. In a modification of this embodiment, in the tuner module 301, a descrambler 321 is provided between the digital tuner unit 11 and the multiplexing unit 15, a CAS module 325 is provided, and a cipher is provided downstream of the multiplexing unit 15. The control unit 381 is provided. In the video apparatus 302, the decoder 324 is provided with a decoding unit 383. In addition, the same code | symbol is attached | subjected about the part which is common in FIG. 1, and detailed description is abbreviate | omitted.

  In the digital tuner unit 11, predetermined signal processing is performed on radio waves of the digital television broadcast received by the antenna 3 connected to the outside of the tuner module 301, and TS is extracted and output to the descrambler 321.

  From the TS output from the digital tuner unit 11, information related to the TS and the encrypted scramble key are extracted by the descrambler 321 and supplied to the CAS module 325.

  When the CAS module 325 determines that viewing is permitted based on the information about the TS received from the descrambler 321, the CAS module 325 decrypts the scramble key received from the descrambler 321 and supplies the decrypted key to the descrambler 321. To do. The descrambler 321 performs descrambling processing on the TS using the decrypted scramble key. The TS that has been descrambled is supplied to the multiplexing unit 15.

  On the other hand, in the analog tuner unit 12, predetermined signal processing is performed on the radio waves of the analog television broadcast received by the external antenna 3, and video signals and audio signals are extracted. The extracted video signal and audio signal are supplied to the digital conversion unit 14 via the switching unit 13, and converted into a digital television broadcast format TS by the digital conversion unit 14. The converted TS is supplied to the multiplexing unit 15.

  In the multiplexing unit 15, the TS supplied from the digital tuner unit 11 and the TS supplied from the digital conversion unit 14 are multiplexed and supplied to the encryption unit 381. Then, the multiplexed TS is encrypted by the encryption unit 381 for each one or a plurality of packets using a predetermined encryption method such as DES or AES. In the encryption, it is preferable to encrypt the portion excluding the header of the TS packet. The encrypted TS is supplied to the video apparatus 302 via the digital communication interface 19 and the digital communication interface 32.

  The TS supplied to the video apparatus 302 via the digital communication interface 32 is subjected to the same processing as that described with reference to FIG. 1 in the DeMUX unit 22, and the digital television broadcast stream and the analog television broadcast are processed. The signal is separated into a stream converted into a digital television broadcast format. Then, one stream is recorded in the recording / reproducing unit 323 and the other stream is supplied to the decoder 324.

  As shown in FIG. 11, the recording / playback unit 323 includes a recording medium 82 and records the stream supplied from the DeMUX unit 22 based on the control of the CPU 28. At this time, the stream is recorded in an encrypted state on the recording medium 82. At the time of reproduction, the stream recorded on the recording medium 82 is read based on the control of the CPU 28 and supplied to the decoder 324.

  As shown in FIG. 12, the decoder 324 includes a switching unit 91, a secondary DeMUX unit 92, a video decoder 93, an audio decoder 94, a data decoder 95, and a decoding unit 383, and each unit is controlled by the CPU 28. The switching unit 91 switches between the stream from the DeMUX unit 22 input to the input terminal 91 a and the stream from the recording / playback unit 323 input to the input terminal 91 b based on the control of the CPU 28 and supplies the stream to the decoding unit 383. To do.

  The stream supplied to the decryption unit 383 is decrypted by a decryption method corresponding to the encryption method used at the time of encryption, and is supplied to the secondary DeMUX unit 92. Then, the decoded stream is separated into video data, audio data, and additional data in the secondary DeMUX unit 92. The video data, audio data, and additional data are supplied to the video decoder 93, audio decoder 94, and data decoder 95, respectively, and decoding processing is performed according to the respective data, and the decoded video data and additional data are displayed on the display unit 26. The decoded audio data is output to the audio output unit 27.

  As described above, the encryption unit 381 is provided in the subsequent stage of the multiplexing unit 15 of the tuner module 301, and the decryption unit 383 is provided in the decoder unit 324 of the video device 302, whereby communication between the tuner module 301 and the video device 302 is performed. The TS can be encrypted, and the stream can be recorded in an encrypted state.

  The embodiment of the present invention and the modification of the embodiment have been specifically described above, but the present invention is limited to the above-described embodiment of the present invention and the modification of the embodiment. However, various modifications and applications are possible without departing from the scope of the present invention. For example, the present invention can be applied to one-segment broadcasting that can be viewed on a mobile terminal such as a mobile phone or a PDA.

  Further, as described above, the present invention is not limited to the case where viewing and recording are performed at the same time. For example, two programs can be recorded simultaneously, or two programs can be recorded by a picture-in-picture function or a picture-out-picture function. It may be displayed on the screen and watched simultaneously.

It is a block diagram which shows the structure of an example of the tuner module and video apparatus 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 a multiplexing part. It is a block diagram which shows the structure of an example of a recording / reproducing part. It is a block diagram which shows the structure of an example of a decoder. FIG. 5 is a block diagram showing an example of a configuration in the case where a descrambler is provided in the subsequent stage of the multiplexing unit of the tuner module in the embodiment of the present invention. FIG. 3 is a block diagram showing an example of the configuration when a descrambler is provided between a digital tuner section and a multiplexing section of a tuner module in an embodiment of the present invention. It is a block diagram which shows the structure of an example of the tuner module and video apparatus which can be applied to the modification of one Embodiment of this invention. It is a block diagram which shows the structure of an example of the recording / reproducing part applicable to the modification of one Embodiment of this invention. It is a block diagram which shows the structure of an example of the decoder applicable to the modification of one Embodiment of this invention. It is a block diagram which shows the structure of an example of the conventional tuner module and an imaging device. It is a basic diagram which shows the structure of an example of a transport stream.

Explanation of symbols

1, 101, 201, 301 Tuner module 2, 102, 202, 302 Video device 11 Digital tuner unit 12 Analog tuner unit 13 Switching unit 14 Digital conversion unit 15 Multiplexing unit 19 Digital communication interface 21 Descrambler 22 DeMUX unit 23, 323 Recording / playback unit 24 Decoder 32 Digital communication interface 71 Configuration information extraction unit 72 PID extraction change unit 73 Secondary MUX unit 81, 381 Encryption unit 82 Recording medium 83, 383 Decryption unit 91 Switching unit 92 Secondary DeMUX unit

Claims (8)

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;
A digital converter that performs predetermined compression encoding processing on the analog video signal and the analog audio signal to generate video data and audio data, multiplexes the video data and audio data, and outputs a second digital signal When,
A multiplexing unit for multiplexing the first digital signal and the second digital signal and outputting a third digital signal;
A tuner module comprising: an interface for transmitting and receiving the third digital signal output from the multiplexing unit to an external device. The tuner module according to claim 1,
The digital converter is
A tuner module, wherein when the video data and audio data are multiplexed, the video data and audio data are each divided into a plurality of packets, and headers indicating packet information are respectively added to the packets. The tuner module according to claim 2, wherein
The first digital signal is composed of a packet composed of video data, audio data, and additional data, and a header indicating packet information is added to the packet,
The multiplexing unit constitutes the first and second digital signals based on packet information for the packets constituting the first digital signal and packet information for the packets constituting the second digital signal. A tuner module, wherein one of the packet information for the packets constituting the first and second digital signals is changed so that packet information for the packets does not overlap. The tuner module according to claim 1,
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 an analog video signal and an analog audio signal;
An analog signal input unit for outputting an analog video signal and an analog audio signal;
One of the output signals from the analog tuner section and the output signal from the analog signal input section is selectively input to the digital conversion section. 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;
A digital converter that performs predetermined compression encoding processing on the analog video signal and the analog audio signal to generate video data and audio data, multiplexes the video data and audio data, and outputs a second digital signal When,
A multiplexing unit for multiplexing the first digital signal and the second digital signal and outputting a third digital signal;
A separation unit for separating the third digital signal into the first digital signal and the second digital signal;
A decoder that receives one of the first digital signal and the second digital signal, separates the digital signal into video data and audio data, and decodes the data;
Recording / reproduction in which one of the first digital signal and the second digital signal is supplied, the digital signal is recorded on a recording medium, and the digital signal recorded on the recording medium is reproduced. A broadcast receiving apparatus. The broadcast receiving device according to claim 5,
The broadcast receiving apparatus further comprising an interface for transmitting and receiving the third digital signal between the multiplexing unit and the demultiplexing unit. The broadcast receiving device according to claim 5,
An encryption unit for encrypting the third digital signal output from the multiplexing unit;
A broadcast receiving apparatus, further comprising: a decoding unit that decodes a digital signal output from one of the separation unit and the recording / reproducing unit. The broadcast receiving device according to claim 5,
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 an analog video signal and an analog audio signal;
An analog signal input unit for outputting an analog video signal and an analog audio signal;
One of the output signal of the said analog tuner part and the output signal of the said analog signal input part is selectively input into the said digital conversion part, The broadcast receiver characterized by the above-mentioned.

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