JP2011049670A - Television broadcast receiving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a television broadcast receiving device which restarts the video displaying from the point of time when the video displaying is interrupted even if video display is interrupted since a video audio signal wirelessly transmitted from a tuner is not normally received by a display section. <P>SOLUTION: The television broadcast receiving device includes: the tuner 1 that wirelessly transmits the video audio signal with frame information added thereto; a recording section 2 that records a broadcast signal and the frame information: and a display section 3 that receives the wirelessly transmitted video audio signal. When the display section 3 transmits reception state information including the frame information of a missing frame and the tuner 1 receives the reception state information, the tuner 1 reads the broadcast signal corresponding to the frame information on the missing frame from the recording section 2, converts the read broadcast signal into the video audio signal, and then, wirelessly transmits the signal to the display section 3. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a television broadcast receiver configured to wirelessly transmit a video / audio signal based on a television broadcast signal received by a tuner unit to a display unit.

  In recent years, television broadcast receivers configured to wirelessly transmit video and audio signals of a broadcast channel selected by a tuner unit that receives a television broadcast signal to a display unit have begun to spread. As such a wireless transmission method, a Wireless HD (Wireless High Definition) method, a WHDI (Wireless Home Digital Interface) method, a UWB (Ultra Wideband Wireless) method, and the like have been proposed (for example, see Non-Patent Document 1). Here, the video / audio signal wirelessly transmitted from the tuner unit to the display unit is a baseband HDTV (high definition television) signal. For example, in the case of uncompressed 8-bit color, 720 line progressive, and a frame rate of 60 Hz, The rate will be 1.4 Gbps. Various measures are taken in order to stably wirelessly transmit such a high bit rate video / audio signal.

  Patent Document 1 uses a compression method that divides video data into a coarse portion and a fine portion and a MIMO (Multiple Input Multiple Output) wireless technology, thereby enabling high bit rate video data to be obtained even in a noisy environment. A system for wirelessly transmitting an image display so as not to be interrupted and displaying the image on a display unit has been proposed.

Special table 2007-507147 gazette

"Wireless HD preps for large-screen debut", Shinko Maekawa, Electronic Engineering Times, June 2, 2008, pp. 10-11

  However, in the above system, wireless transmission may become impossible when the wireless transmission path is temporarily interrupted or when the wireless transmission transmission band competes with the wireless LAN transmission band. In this case, there is a problem that wireless transmission cannot be temporarily continued, video display on the display unit is interrupted, and part or all of the television program is missed.

  Therefore, the present invention has been made to solve the above-described problems of the prior art, and its purpose is that when video data transmitted wirelessly cannot be received normally and video display on the display unit is interrupted. Another object of the present invention is to provide a television broadcast receiver capable of resuming video display from the time when video display is interrupted.

  A television broadcast receiving device according to the present invention is a television broadcast receiving device having a tuner unit, a recording unit for recording information, and a display unit, wherein the tuner unit includes a broadcast signal receiving unit for receiving a broadcast signal; A signal processing unit for converting the broadcast signal into a video / audio signal in a format suitable for the display unit, and frame information addition for adding frame information indicating the order of the frames to a frame of the video signal constituting the video / audio signal A wireless transmission unit that wirelessly transmits the video / audio signal with the frame information added thereto, the broadcast signal and the frame information recorded in the recording unit, and the broadcast recorded in the recording unit A recording / playback control unit that reads a signal from the recording unit; and a reception state detection unit that receives reception state information of the video and audio signal wirelessly transmitted from the wireless transmission unit. The display unit includes a wireless reception unit that receives the video / audio signal wirelessly transmitted from the wireless transmission unit, a display device that displays video, and a video based on the video / audio signal received by the wireless reception unit. If the frame is missing in the video / audio signal received by the display unit and the wireless receiver received by the display device, and it is determined that the frame is missing And a reception state monitoring unit that transmits a determination result including frame information of the missing frame as the reception state information to the reception state detection unit.

  According to the television broadcast receiving apparatus according to the present invention, even when the display unit cannot receive the wirelessly transmitted video data normally and the video display on the display unit is interrupted, the video display is interrupted. There is an effect that the video display can be resumed.

It is a block diagram which shows roughly the structure of the television broadcast receiver which concerns on Embodiment 1 and 2 of this invention. 6 is a block diagram schematically showing a configuration of a decoder of a television broadcast receiving apparatus according to Embodiment 2. FIG. 10 is a diagram for explaining frame thinning-out processing by a decoder of the television broadcast receiving apparatus according to Embodiment 2. FIG.

Embodiment 1 FIG.
FIG. 1 is a block diagram schematically showing a configuration of a television broadcast receiving apparatus according to Embodiment 1 of the present invention. As shown in FIG. 1, the television broadcast receiving apparatus according to Embodiment 1 receives a broadcast signal and wirelessly transmits a video / audio signal based on the received broadcast signal, and the tuner unit 1 receives the broadcast signal. A recording unit 2 for recording a broadcast signal and a display unit 3 for receiving a video / audio signal wirelessly transmitted from the tuner unit 1 and displaying a video are provided.

  As shown in FIG. 1, a tuner unit 1 includes an RF receiving unit (broadcast signal receiving unit) 11 that receives a broadcast signal, and a signal processing unit that converts the broadcast signal into a video / audio signal having a format suitable for the display unit. 18 (digital demodulator 12 and decoder 13), a frame information adding unit 15 for adding frame information indicating the order of the frames to the frame of the video signal constituting the video / audio signal, and the video / audio signal to which the frame information is added From the wireless transmission unit 16, the recording / playback control unit 14 that records the broadcast signal and the frame information in the recording unit 2, and the broadcast signal recorded in the recording unit 2. A reception state detection unit 17 that receives reception state information from the display unit 3 on the display unit 3 of the transmitted video / audio signal;

  The RF receiver 11 receives an RF signal, which is a television broadcast signal input via the antenna 4 (or a network line (not shown)). The RF signal received by the RF receiver 11 is digitally modulated by a VSB (residual sideband) modulation method, a QAM (orthogonal amplitude modulation) method, an OFDM (orthogonal frequency division multiplexing) method, or the like. The digital demodulator 12 demodulates the RF signal from the RF receiver 11 and outputs a broadcast signal. The decoder 13 receives the broadcast signal output from the digital demodulator 12, restores the original signal from the compressed broadcast signal, and outputs it as a video / audio signal. The restored video / audio signal is wirelessly transmitted from the wireless transmission unit 16 to the wireless reception unit 32 of the display unit 3, and an image based on the wirelessly transmitted video / audio signal is displayed on the display device 34 of the display unit 3. The frame information adding unit 15 receives the video / audio signal output from the decoder 13 and sets the frame information indicating the temporal position of the frame (for example, the video frame started to be transmitted by the wireless transmission unit 16 as the frame number “0”, In the subsequent video frames, a frame number that increases by 1 in order is added to a signal that is wirelessly transmitted to the display unit 3. The wireless transmission unit 16 receives the video / audio signal with the frame information added from the frame information addition unit 15 and wirelessly transmits the received video / audio signal to the display unit 3.

  The recording / playback control unit 14 controls the operation of the recording unit 2, transmits the broadcast signal output from the digital demodulator 12 to the recording unit 2, records it in the recording unit 2, and from the recording unit 2 as necessary. Read the recorded broadcast signal.

  As shown in FIG. 1, the display unit 3 includes a wireless reception unit 32 that receives a video / audio signal wirelessly transmitted from the wireless transmission unit 16, a display device 34 that displays video, and a wireless reception unit 32. A display processing unit 33 that displays video based on the received video / audio signal on the display device 34, and a reception status monitoring unit that transmits reception status information of the video / audio signal received by the wireless reception unit 32 to the reception status detection unit 17. 31.

  For example, the display processing unit 33 has a frame buffer for at least one frame, receives a video / audio signal from the wireless reception unit 32, and converts the received video / audio signal into a signal suitable for display on the display device 34. The display device 34 is, for example, an LCD or a plasma display panel, and displays an image based on the image signal received from the display processing unit 33. Whether the reception state monitoring unit 31 can monitor the reception state of the video / audio signal in the wireless reception unit 32 and monitor the frame information inserted by the frame information addition unit 15 of the tuner unit 1 to reproduce continuous frames. Confirm. In other words, the reception state monitoring unit 31 determines whether or not a frame loss has occurred in the video / audio signal received by the wireless reception unit 32. If it is determined that a frame loss has occurred, the reception state monitoring unit 31 has lost the frame. The determination result including the frame information of the frame is transmitted to the reception state detection unit 17 as reception state information.

  As shown in FIG. 1, the recording unit 2 includes a broadcast signal transmission / reception unit 21, a disk control unit 22, and a hard disk drive (HDD) 23.

  The broadcast signal transmission / reception unit 21 receives the broadcast signal from the tuner unit 1 and outputs the broadcast signal to the disc control unit 22. The disk control unit 22 writes the broadcast signal received from the broadcast signal transmission / reception unit 21 in the HDD 23. Further, the disk control unit 22 reads a broadcast signal from the HDD 23 as necessary, and outputs the read broadcast signal to the broadcast signal transmission / reception unit 21. The broadcast signal transmission / reception unit 21 sends the read broadcast signal to the recording / playback control unit 14. Although the case where the recording medium in the recording unit 2 is an HDD has been described, the recording medium may be another type of recording medium such as a semiconductor memory as long as it can record a broadcast signal.

  Next, the operation of the television broadcast receiving apparatus according to Embodiment 1 will be described. The television broadcast signal input from the antenna 4 is received as an RF signal by the RF receiver 11. The RF signal is demodulated by the digital demodulator 12 and output as a broadcast signal. Here, the broadcast signal is a digital video / audio signal compressed by the MPEG standard or the like. The broadcast signal output from the digital demodulator 12 is decoded by the decoder 13 and converted into a video / audio signal as a baseband signal, and the converted video / audio signal is input to the frame information adding unit 15. The frame information adding unit 15 adds frame information indicating the temporal position of each frame to the video / audio signal. For example, the frame information adding unit 15 sets a video frame that has started transmission by the wireless transmission unit 16 as a frame number “0”, and adds a number that is incremented by 1 in subsequent video frames as a frame number. The video / audio signal to which the frame number is added is wirelessly transmitted from the wireless transmission unit 16 to the display unit 3.

  In digital broadcasting, the MPEG standard is often adopted, and in this case, moving picture data is decoded in units of GOP (Gourp of Pictures) in which a predetermined number of pictures are grouped into one group. Therefore, when frame numbers are assigned in order for each frame, the range of frame numbers corresponding to each GOP can be known. Therefore, for example, the recording / playback control unit 14 may add the frame number of the first frame of the GOP to the broadcast signal as additional information and send it to the recording unit 2. Further, the frame number of the first frame of the GOP may be added as additional information for each GOP, or the frame number of the first frame of the GOP is added as additional information for each predetermined number of GOPs. Also good. The frame information added to the broadcast signal recorded by the recording / playback control unit 14 in the recording unit 2 and the frame information added to the video / audio signal wirelessly transmitted by the frame information adding unit 15 are mutually corresponding information.

  The display unit 3 receives a video / audio signal wirelessly transmitted from the wireless transmission unit 16 of the tuner unit 1 by the wireless reception unit 32, and has a signal format suitable for display on the display device 34 by the display processing unit 33. Convert. The converted video / audio signal is input from the display processing unit 33 to the display device 34, and the video based on the video / audio signal is displayed on the display device 34.

  The reception state monitoring unit 31 monitors the reception state of wireless transmission in the wireless reception unit 32 and determines whether the reception state is good or bad. As a determination method of the reception state, for example, an error detection code is inserted into the video / audio signal in the wireless transmission unit 16 to calculate an error rate in the wireless reception unit 32, and is received when the calculated error rate is a predetermined value or less. There are methods such as determining that the state is good and determining that the state is bad when it exceeds a predetermined value.

  Further, the reception state monitoring unit 31 obtains frame information added to the video / audio signal received by the wireless reception unit 32 from the determination result of the reception state and the video signal received by the wireless reception unit 32, and all frames are received. It is determined whether or not it has been normally received. For example, when a video frame that has started transmission by the wireless transmission unit 16 is set to frame number “0” and a number that is incremented by 1 in subsequent frames is added as a frame number, the reception state monitoring unit 31 receives Check whether the frames of the video signal are continuous. The reception state monitoring unit 31 detects that a missing frame has occurred when the received frames are not continuous. When the occurrence of a loss is detected, the reception state monitoring unit 31 stores the frame immediately before the detection of the loss in the display processing unit 33, and the lost frame with respect to the reception state detection unit 17 of the tuner unit 1. The number is transmitted wirelessly or wired. When the reception state monitoring unit 31 is configured to wirelessly transmit the missing frame number, the reception state monitoring unit 31 includes a wireless transmission unit, and the reception state detection unit 17 includes a wireless reception unit.

  When the reception state monitoring unit 31 determines that the wireless communication state is bad, the display processing unit 33 sends, for example, a normally received frame before the wireless communication state becomes bad to the display device 34 as a still image.

  When the reception state detection unit 17 receives the determination result of the reception state monitoring unit 31 and detects that a frame is missing, the reception state detection unit 17 enables playback to start from the missing frame from the broadcast signal recorded in the recording unit 2. Preparation for the recording / reproduction control unit 14 is instructed. For this reason, the recording / playback control unit 14 determines the maximum time required to notify the reception state detection unit 17 that at least the video signal output from the decoder 13 has been lost, that is, the delay due to decoding delay and wireless transmission. The operation is set so that the recording unit 2 always records a broadcast signal for a time longer than the total delay time (maximum delay time) obtained by adding delay due to other processing. When a frame is lost, recording is continued until wireless transmission from the tuner unit 1 to the display unit 3 is established. That is, the recording unit 2 records at least the signal corresponding to the maximum delay time, and when the wireless transmission from the tuner unit 1 can be resumed, from the video / audio signal of the frame that the wireless transmission could not be normally received. Since the wireless transmission is started, the display processing unit 33 can restart the display from the frame next to the frame held by the display processing unit 33, and no display content is lost.

  Further, after normal wireless transmission is interrupted, when the normal wireless transmission state between the tuner unit 1 and the display unit 3 is recovered, that is, when the reception state detection unit 17 determines that the reception state is good, recording / reproduction is performed. The control unit 14 instructs the recording unit 2 to reproduce the broadcast signal recorded in the HDD 23 while continuing to record the broadcast signal. Then, the broadcast signal is read from the HDD 23 to the broadcast signal transmission / reception unit 21 via the disk control unit 23 and further transmitted to the recording / playback control unit 14. The broadcast signal stream reproduced in this way is sent to the decoder 13 and decoded instead of the output from the digital demodulator 12. Thereafter, the broadcast signal read from the recording unit 2 is processed in the same manner as the broadcast signal output from the digital demodulator 12, and is wirelessly transmitted from the wireless transmission unit 16 to the display unit 3 as a video / audio signal.

  When the display processing unit 33 is displaying a still image of a normally received video on the display device 34, the display is resumed from the frame having the frame number next to the frame of the displayed still image. The device 34 can display a smooth image.

  In the first embodiment, the recording / playback control unit 14 performs control so that the broadcast signal displayed in the display device 34 is erased from the HDD 23 when the reception state of the wireless communication is good and the video / audio signal is wirelessly transmitted. May be. In addition, the broadcast signal corresponding to the maximum delay time is usually stored in a buffer memory (not shown) provided separately from the HDD 23, and recording for a long time is required before normal wireless transmission can be resumed. In such a case (only when the capacity of the buffer memory is insufficient), the HDD 23 may be recorded.

  The signal stored in the recording unit 2 is recorded in the form of an undecoded stream, or in the case of digital television broadcast reception, generally in the form of an MPEG2 stream in order to reduce the necessary storage capacity. Since the decoding process by the decoder 13 needs to be performed from the first frame of the GOP, in order to wirelessly transmit the frame of the frame number in which the wireless transmission has become defective from the wireless transmission unit 16 until the wireless state is recovered. The GOP including the frame is decoded so that wireless transmission can be resumed from the frame.

  Furthermore, time may be used as the frame information added by the frame information adding unit 15 in the first embodiment. Here, the time added by the frame information adding unit 15 includes a current time, a PTS (Presentation Time Stamp) used in MPEG decoding, and the like. In this case, it is possible to use the time information used when decoding the video / audio signal compressed by MPEG instead of the frame number, so that it is not necessary to count the frames.

  As described above, the television broadcast receiving apparatus according to the first embodiment includes the tuner unit 1, the display unit 3, and the recording unit 2. When the display unit 3 detects a missing frame, The lost frame is transmitted to the tuner unit 1, and the tuner unit 1 reads and decodes the stream stored in the recording unit 2 from the missing frame based on the frame information sent from the display unit 3, and displays it on the display unit 3. Therefore, the video display can be resumed so as to smoothly connect to the screen of the display unit 3 that has been stopped while the reception state between the tuner unit 1 and the display unit 3 is deteriorated. For this reason, according to the television broadcast receiving apparatus according to the first embodiment, even when there is a period in which the wireless transmission cannot be performed normally, the viewer can continue the television broadcast after the wireless transmission state is recovered. Thus, the viewer does not have to miss part or all of the television broadcast.

Embodiment 2. FIG.
The television broadcast receiving apparatus according to Embodiment 2 of the present invention is characterized in that a function for reducing the reproduction time of the broadcast signal received from the recording / reproduction control unit 14 is added to the decoder 13a that decodes the broadcast signal into a video / audio signal. This is different from the television broadcast receiving apparatus according to the first embodiment. Except for this difference, the television broadcast receiving apparatus according to the second embodiment is the same as the television broadcast receiving apparatus according to the first embodiment. Therefore, FIG. 1 is referred to in the description of the second embodiment.

  FIG. 2 is a block diagram schematically showing the configuration of the decoder 13a of the television broadcast receiving apparatus according to the second embodiment. As shown in FIG. 2, the decoder 13 a includes a demultiplexer 130, a stream extraction unit 131, a video decoder 132, a video stream analysis unit 133, a playback speed control unit 134, and an audio decoder 135. .

  The demultiplexer 130 receives a broadcast signal in which a video signal and an audio signal are multiplexed from the recording / playback control unit 14 and separates the received broadcast signal into a video stream and an audio stream. The video stream analysis unit 133 receives the video stream from the demultiplexer 130, analyzes the received video stream, and determines a stream position to be extracted. The stream extraction unit 131 receives the video stream from the demultiplexer 130, cuts out a part of the video stream in a decodable form, that is, thins out the frames. The video decoder 132 receives the video stream from the stream extraction unit 131, decodes the received video stream in accordance with the MPEG2 standard, and outputs a video signal.

  The audio decoder 135 receives the audio stream from the demultiplexer 130, decodes the received audio stream in accordance with the MPEG2 standard, and outputs an audio signal. The audio decoder 135 receives the control signal from the playback speed control unit 134 and adjusts the clock frequency to perform decoding according to the playback speed of the video signal generated by the decoding of the video decoder 132.

  In the television broadcast receiving apparatus according to the second embodiment, the tuner unit 1 includes a decoder 13a that decodes a broadcast signal, and the decoder 13a has a constant ratio from the stream of the broadcast signal read by the recording / playback control unit 14. The frame is thinned and decoded and output as a video / audio signal. The television broadcast signal while the display by the display unit 3 is interrupted is recorded by the recording unit 2, and the reproduction is resumed after the wireless transmission state between the tuner unit 1 and the display unit 3 becomes normal. By performing high-speed playback, which is faster than normal playback, immediately after resuming playback, the RF receiver 11 can catch up with the TV broadcast being received, and recording the broadcast signal to the recording unit 2 after catching up. Even without this, it is possible to display a video on the display unit 3.

  FIG. 3 is a diagram illustrating each frame of the video stream. As shown in FIG. 3, the video stream of the broadcast signal encoded in the MPEG2 format is divided into three types, that is, an intra frame (I frame), a prediction frame (P frame), and a bidirectional prediction frame (B frame). Encoded separately. In FIG. 3, I indicates an I frame, and the I frame is a frame that is encoded within the frame and can be decoded without depending on other frames to obtain a frame screen. P indicates a P frame, and the P frame encodes a difference between frames by motion compensation prediction from the preceding I frame or P frame, and therefore, one frame with a smaller data amount than an I frame closed within the frame. Can be encoded. B indicates a B frame, and the B frame is a frame that is encoded so that a minimum amount of data based on motion compensation prediction is obtained from both the immediately preceding I or P frame and the immediately following I or P frame.

  In the second embodiment, frames are thinned out from a stream to be decoded at a certain rate in order to increase the reproduction speed. For example, since the broadcast signal is 30 frames / second, when one frame is thinned out per second, reproduction is performed at 30/29 times speed.

  Here, the process of thinning out a frame includes a method of thinning out a frame from a video signal after decoding and a method of thinning out a frame from a video signal before decoding. In order to increase the reproduction speed, the decoder 13a must also execute signal processing at a high speed in accordance with the increased reproduction speed. As a video decoder 132, a video decoder 132 that can execute signal processing at a higher speed than normal reproduction is available. I need it. In the second embodiment, a method that can reduce the amount of signal processing, that is, a case where decoding is performed after thinning out frames will be described.

  Next, the operation of the decoder 13a in the second embodiment will be described. The broadcast signal input from the digital demodulator 12 to the demultiplexer 130 is separated into a video stream and an audio stream. The video stream is sent to the video stream analysis unit 133, and a stream portion corresponding to the frame to be thinned is determined. The video stream analysis unit 133 calculates the number of frames to be thinned out at regular intervals based on the playback speed instruction sent from the playback speed control unit 134.

  When I frames are thinned out, P frames or B frames existing after the thinned I frames cannot be decoded. When P frames are thinned out, B frames existing before and after the thinned P frames are decoded. As a result, the video cannot be displayed until the next I frame. Therefore, it is desirable that the frame to be thinned out is a B frame. When there is no B frame to be thinned out, the video stream analysis unit 133 instructs the stream extraction unit 131 to thin out the P frame immediately before the I frame.

  The stream extraction unit 131 thins out frames in accordance with instructions from the video stream analysis unit 133 and sends the video stream with the thinned frames to the video decoder 132. The video decoder 132 decodes the received video stream.

  When the video decoder 132 sequentially decodes the input stream and detects a drop of a frame (missing due to thinning), the video decoder 132 skips to the data of the next frame and continues decoding. At this time, for example, if a video stream is continuously input to the stream extraction unit 131 at a constant rate of 30 frames per second, the playback speed can be adjusted according to the ratio of frames dropped by the stream extraction unit 131. On the other hand, for audio, the decoding speed is increased by increasing the clock frequency of the audio decoder 135 or the like. The playback speed control unit 134 controls playback of both video and audio so that the video and audio are decoded at a synchronized speed.

  As described above, in the television broadcast receiving apparatus according to Embodiment 2, the tuner unit 1 includes the decoder 13a that decodes the broadcast signal, and the decoder 13a reads the broadcast signal read by the recording / playback control unit 14. The video stream is decoded by thinning out frames at a constant rate and output as a video / audio signal. For this reason, according to the television broadcast receiver display unit 3 according to the second embodiment, the television broadcast while the video display is interrupted is recorded by the recording unit 2, and is read and reproduced after the wireless transmission state is recovered. It is possible to catch up with the actual broadcast by performing high-speed playback, and the subsequent broadcast recording can be made unnecessary.

  Furthermore, the decoder 13a of the television broadcast receiving apparatus according to Embodiment 2 includes a demultiplexer 130 as a separating unit that separates a broadcast signal into a video stream and an audio stream, and a stream extraction unit 131 that extracts a part of the video stream. A video decoder 132 that decodes the extracted video stream as a video signal, an audio decoder 135 that decodes the audio stream as an audio signal, and a playback speed control that synchronizes the playback of the video signal and the audio signal and outputs them as a video and audio signal. Part 134. For this reason, since the audio signal is also reproduced at high speed in accordance with the high-speed reproduced video, the video and audio can be synchronized and reproduced without deviation from the video and audio. Disappear.

  1 tuner unit, 2 recording unit, 3 display unit, 4 antenna, 11 RF receiving unit, 12 digital demodulator, 13, 13a decoder, 14 recording / playback control unit, 15 frame information adding unit, 16 radio transmitting unit, 17 receiving state Detection unit, 18 signal processing unit, 21 broadcast signal transmission / reception unit, 22 disk control unit, 23 hard disk drive, 31 reception status monitoring unit, 32 wireless reception unit, 33 display processing unit, 34 display device, 130 demultiplexer, 131 stream extraction Unit, 132 video decoder, 133 video stream analysis unit, 134 playback speed control unit, 135 audio decoder.

Claims (8)

A television broadcast receiver having a tuner unit, a recording unit for recording information, and a display unit,
The tuner section is
A broadcast signal receiver for receiving broadcast signals;
A signal processing unit for converting the broadcast signal into a video / audio signal in a format suitable for the display unit;
A frame information adding unit for adding frame information indicating the order of the frames to a frame of the video signal constituting the video / audio signal;
A wireless transmission unit for wirelessly transmitting the video / audio signal with the frame information added thereto;
A recording / playback control unit for causing the recording unit to record the broadcast signal and the frame information, and reading the broadcast signal recorded in the recording unit from the recording unit;
A reception state detection unit that receives reception state information of the video and audio signal wirelessly transmitted from the wireless transmission unit;
The display unit
A wireless receiver for receiving the video and audio signal wirelessly transmitted from the wireless transmitter;
A display device for displaying images;
A display processing unit that causes the display device to display video based on the video and audio signal received by the wireless reception unit;
It is determined whether or not a frame loss has occurred in the video and audio signal received by the wireless reception unit, and if it is determined that a frame loss has occurred, a determination result including frame information of the lost frame And a reception state monitoring unit that transmits the reception state information to the reception state detection unit. When the reception state detection unit receives the reception state information including frame information of the missing frame,
The recording / playback control unit reads the broadcast signal corresponding to the frame information of the missing frame from the recording unit, and the signal processing unit converts the read broadcast signal into the video / audio signal, The television broadcast receiver according to claim 1, wherein the wireless transmission unit wirelessly transmits the video / audio signal to the wireless reception unit. The signal processing unit
A digital demodulator that demodulates the broadcast signal received by the broadcast signal receiver;
The television broadcast receiver according to claim 1, further comprising: a decoder that decodes the demodulated broadcast signal to generate the video / audio signal.   4. The television broadcast reception according to claim 1, wherein transmission of the reception state information from the reception state monitoring unit to the reception state detection unit is performed by wireless transmission or wired transmission. apparatus.   5. The television broadcast receiving apparatus according to claim 1, wherein the frame information is a number assigned to each frame or a predetermined number of frames. 6.   5. The television broadcast receiving apparatus according to claim 1, wherein the frame information is a time stamp attached to each frame.   7. The signal processing unit according to claim 1, wherein the signal processing unit performs a process of thinning out frames at a certain rate from the broadcast signal stream read from the recording unit by the recording / playback control unit. The television broadcast receiver as described. The signal processing unit
Separating means for separating the broadcast signal into a video stream and an audio stream;
Stream extraction means for extracting a part of the video stream;
A video decoder for decoding the extracted video stream as a video signal;
An audio decoder for decoding the audio stream as an audio signal;
8. The television broadcast receiving apparatus according to claim 1, further comprising: a reproduction speed control unit configured to synchronize reproduction of the video signal and the audio signal and to output the video signal as the video / audio signal.

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