JP2006324960A - Radio communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication apparatus which can display character information of character broadcasting, caption broadcasting, etc. in sufficient quality. <P>SOLUTION: A signal separator 21 separates a composite signal "a" including video, voice and character information into a video and voice signal "b" and an accompanying signal "c", an encoder 23 carries out coding processing for the video and voice signal "b", a first communication processor 25 respectively gives identification codes to the coded video and voice signal "e", and the coded accompanying signal "f"; carries out transmission signal processing; and carries out radio communication of the composite signal "a" including video, voice and character information. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a wireless communication apparatus, and more particularly, to a wireless communication apparatus for a synthesized signal including video, audio, and accompanying information.

  Currently, wireless communication devices that can be carried between short distances, for example, wireless televisions that can be carried at home, have been put into practical use.

  A wireless television has a station that transmits video and audio data received by an antenna according to a wireless communication method such as IEEE802.11b and 11a, and a monitor that receives and displays video and audio data transmitted by the station. is doing.

  The station is connected to an antenna that receives broadcast radio waves, selects a TV channel broadcast requested by the user, a video decoder that converts an analog video signal input from the tuner into a digital video signal, and a video decoder A wireless signal that has been subjected to transmission processing, and has an encoder that compresses the amount of information by encoding the digital video signal output from the transmission, and a transmission processing unit that performs processing for wirelessly transmitting the output from the encoder Is connected to the antenna to transmit.

  On the other hand, the monitor is connected to an antenna that receives a radio signal transmitted from the station, and a reception processing unit that extracts an encoded video signal from the radio signal received by the antenna, and decodes the encoded video signal. A decoder for performing the conversion process, and an output unit for outputting the decoded digital video signal to a display such as a liquid crystal panel.

  As a result, video and audio signals can be transmitted from the station to the monitor using radio, and the user can carry the monitor to a desired location for reception and view the television broadcast.

  In recent years, character broadcasting (teletext) and subtitle broadcasting (closed captioning) have begun to spread, and it is required that wireless television can display not only video and audio information but also text information in a good manner.

  However, in the conventional wireless television, when an accompanying signal other than video and audio signals, for example, a character signal is included, the character signal is also treated as a video signal, so that the image quality of characters displayed on the display is deteriorated. .

  That is, characters such as teletext are encoded as video by an encoder at a station, for example, compressed by MPEG (Moving Picture Experts Group), etc., and decoded and displayed by a monitor decoder. There arises a problem that the outline of the material is broken.

Furthermore, since signals other than characters, for example, VBI (Vertical Blanking Interval) signals accompanying video and audio signals cannot be normally transmitted to the monitor, there is a problem that appropriate processing cannot be performed on the monitor side based on the VBI signal.
For example, even when the VBI signal is a copy guard signal, there arises a problem that video and audio can be copied.

  On the other hand, a playback apparatus that handles video, audio signals, and character signals separately is known (see, for example, Patent Document 1).

  In an apparatus for reproducing an information signal composed of character information and an image signal disclosed in Patent Document 1, an output unit that processes character information and outputs it to an external device, and a plurality of modes including a normal reproduction mode. It has mode setting means for setting the mode of the apparatus, and control means for controlling the operation of the output means in accordance with the mode set by the mode setting means.

However, in the playback apparatus disclosed in Patent Document 1, even when an operation such as stop, pause, search, etc. is performed during playback of a tape on which a video signal on which closed caption information is multiplexed is recorded, characters are normally displayed. No indication is made about the case where a composite signal including video, audio signals and character signals is transmitted wirelessly.
JP 2001-245251 (page 4, FIG. 1)

  The present invention provides a wireless communication apparatus capable of displaying text information in text broadcast, subtitle broadcast, etc. with sufficient quality.

  In order to achieve the above object, in the wireless communication device of one aspect of the present invention, a signal separation unit that separates a composite signal including video, audio, and accompanying information into the video, audio signal, and the accompanying signal, and the separation An encoding processing unit that performs encoding processing on the encoded video and audio signals, and transmission signal processing by adding identification codes to the encoded video, audio signals, and the separated accompanying signals, and the transmission And a communication processing unit for transmitting a composite signal including signal-processed video, audio, and accompanying information.

  According to another aspect of the present invention, there is provided a wireless communication device that includes a signal separation unit that separates a composite signal including video, audio, and accompanying information into the video, audio signal, and the accompanying signal, and the separated video and audio signal. An encoding processing unit that performs encoding processing on the encoded image, the audio signal, and the separated accompanying signal, each of which is subjected to transmission signal processing, and the transmission signal processed video, A first wireless communication device having a first communication processing unit for transmitting a synthesized signal including voice and accompanying information; receiving the transmitted synthesized signal; and based on the identification code based on the received synthesized signal A second communication processing unit that performs reception signal processing and reproduces the encoded video and audio signals and the separated accompanying signal; and a decoding process that performs decoding processing on the encoded video and audio signals Department and A second wireless communication device comprising: an output unit that combines the decoded video and audio signals and the separated accompanying signal and outputs the combined signal to a display unit; It is a feature.

  ADVANTAGE OF THE INVENTION According to this invention, the radio | wireless communication apparatus which can display the character information in character broadcasting, caption broadcasting, etc. with sufficient quality is obtained.

  Embodiments of the present invention will be described below with reference to the drawings.

  A wireless communication apparatus according to Embodiment 1 of the present invention will be described with reference to FIGS. The wireless communication apparatus according to the present embodiment is an example of a wireless television that performs two-way information communication in a short distance by a wireless communication method such as IEEE802.11b in 2.4 GHz band or IEEE802.11a in 5 GHz band. 1 is a system configuration diagram of a wireless television, FIG. 2 is a block diagram illustrating a configuration of the station, and FIG. 3 is a block diagram illustrating a configuration of the monitor.

  As shown in FIG. 1, the wireless television 10 of the present embodiment includes a station (first wireless communication device) 11 and a monitor (second wireless communication device) 12 that communicate with each other.

  When one of the station 11 and the monitor 12 is the transmission side, the other is the reception side. However, regarding the video signal and the audio signal, the station 11 is usually the transmission side and the monitor 12 is the reception side.

  The station 11 is connected to an antenna 13 for receiving broadcast radio waves and an antenna 14 for communicating with the monitor 12. Furthermore, AV equipment 15 such as a VTR (Video Tape Recorder) and a DVD (Digital Versatile Disk) for reproducing recorded video can be connected.

  An antenna 16 for communicating with the station 11 and a display 17 for displaying an image are connected to the monitor 12.

  As shown in FIG. 2, the station 11 selects a TV channel requested by the user from broadcast radio waves received by the antenna 13, and analog video, audio and associated information of the TV channel selected by the tuner 20, for example, A signal separation unit 21 that separates a synthesized signal a including character information into a video, audio signal (hereinafter referred to as a video signal) b and a character signal c; a video decoder 22 that converts the video signal b into a digital video signal d; An encoder 23 that encodes the video signal d into a video signal e whose amount of information is compressed by, for example, an MPEG (Moving Picture Experts Group) system; a CPU 24 that converts the character signal c into a coded character signal f; A first communication processing unit 25 that performs transmission signal processing on the video signal e and the character signal f and wirelessly transmits the signal is provided.

  The first communication processing unit 25 includes buffers 26 and 27 for temporarily storing the video signal e and the character signal f, a CPU 28, a baseband processing unit 29, an RF (Radio Frequency) processing unit 30, and a communication control program. Etc. and a storage unit 31 for storing control data and the like.

  The CPU 24 is connected to the tuner 20, the signal separation unit 21, the video decoder 22, the encoder 23, and the first communication processing unit 25 through a common bus (not shown), and exchanges data, control commands, and the like to operate the entire station 11. Is controlling.

  The CPU 24 and the first communication processing unit 25 are connected by a dedicated bus, for example, an IIC (Inter Integrated Circuit) (R) bus 32, and the CPU 24 operates as a master and the first communication processing unit 25 operates as a slave.

  When receiving the character signal c, the CPU 24 encodes the character signal f, accesses the first communication processing unit 25, and writes the encoded character signal f in the buffer 27.

  As shown in FIG. 3, the monitor 12 includes a second communication processing unit 40 that reproduces an encoded video signal e and an encoded character signal f from a signal received by the antenna 16, and an encoded video signal e. The decoder 41 that converts the video signal d into a digital video signal d, the CPU 42 that converts the encoded character signal f into the video signal h, and displays the video signal d and the video signal h so as to meet the display specifications. A scaler 43 that controls the size and the like, and an output unit 44 that outputs a display signal of voice and character information restored by driving the display 17 are provided.

  The second communication processing unit 40 includes buffers 45 and 46 for temporarily storing the video signal e and the character signal f, a CPU 47, a baseband processing unit 48, an RF (Radio Frequency) processing unit 49, and communication control. And a storage unit 50 for storing programs and the like and storing control data and the like.

  The CPU 42 is connected to the second communication processing unit 40, the decoder 41, the scaler 43, and the output unit 44 via a common bus (not shown), and exchanges data, control commands, and the like to control the overall operation of the monitor 12. .

  The second communication processing unit 40 is connected by a dedicated bus, for example, an IIC (R) bus 51, and the second communication processing unit 40 operates as a master and the CPU 42 operates as a slave.

  When the character signal f is written in the buffer 46, the second communication processing unit 40 accesses the CPU 42 and writes the character signal f in a buffer (not shown) in the CPU 42.

  On the other hand, the second communication processing unit 40 can operate as a slave and the CPU 42 can operate as a master. In this case, the CPU 42 periodically accesses the buffer 46 to check whether or not the character signal f has been written to the buffer 46. If the CPU 42 determines that the character signal f has been written, the CPU 42 reads the character signal f from the buffer 46. To a buffer (not shown).

  Next, a method for wirelessly transmitting the video signal e and the character signal f to the monitor 12 will be specifically described.

  FIG. 4 is a diagram showing video, audio and character signals, FIG. 4 (a) is a composite signal a including video, audio and character information, FIG. 4 (b) is a separated analog video signal b, FIG. c) is the separated character signal c, FIG. 4 (d) is the encoded video signal d, FIG. 4 (e) is the encoded character signal f, and FIG. 4 (f) is the video signal e and the character signal. It is a figure which shows typically the packet transmission signal which attached | subjected the identification signals p and q to f, respectively.

  As shown in FIG. 4A, the composite signal a including the video, audio, and character information received by the antenna 13 and selected by the tuner 20 is superimposed on the video, audio, and character information, and has a high frequency in the VHF to UHF band. Frequency modulated by the carrier.

  Next, as shown in FIGS. 4B and 4C, the signal separation unit 21 separates the analog video signal b and the character signal c from the synthesized signal a including video, audio, and character information.

  Next, as shown in FIGS. 4D and 4E, the video signal b is encoded by the video decoder 22 and the encoder 23, and the encoded video signal e is packetized by the first communication processing unit 25. Thus, a video packet V is obtained.

  Similarly, the character signal c is encoded by the CPU 24, and the encoded character signal f is packetized by the first communication processing unit 25 to obtain a character packet M.

  Next, as shown in FIG. 4 (f), the first communication processing unit 25 adds an identification code p to the head of each video packet V using, for example, the idle time T1 for the packet period T0. A packet transmission signal g with an identification code q is generated at the head of each character packet M.

  Therefore, it is possible to wirelessly transmit to the monitor 12 in a form that can identify whether the packet signal is the video packet V or the character packet M by the identification code at the head of each packet signal.

  The monitor 12 determines that the packet signal received by the second communication processing unit 40 is a video packet V when the identification code is p, and a character packet M when the identification code is q, and separates it into a video signal e and a character signal f. Is possible.

  As described above, according to the wireless television 10 of the first embodiment, the video, audio signal, and character signal are separated, and the character signal is wirelessly transmitted without being subjected to the encoding process. Display quality does not deteriorate.

  As a result, it is possible to display character information in character broadcasting, subtitle broadcasting, etc. with sufficient quality. Accordingly, it is possible to provide a wireless communication device with high display quality of character information.

  Although the case where character information is transmitted wirelessly has been described here, the same applies to other VBI signals.

  Next, a wireless television according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a block diagram showing the configuration of the station, and FIG. 6 is a diagram showing the relationship between the encoding rate and processing delay time that occur when a video signal is encoded by an encoder and decoded by a decoder.

  In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different portions are described.

  The second embodiment is different from the first embodiment in that a delay time equal to a processing delay time generated when a video signal is encoded and decoded with respect to a character signal is generated.

That is, as shown in FIG. 5, the first communication processing unit 60 of the station 11 has a delay processing unit 61 connected between the buffer 27 and the CPU 28.
For example, an inverter delay circuit connected in cascade in multiple stages is suitable as the delay processing unit 61, but is not particularly limited.

  The delay processing unit 61 receives, for example, MPEG encoding rate data as the delay time setting signal i from the encoder 23, and refers to the MPEG encoding rate and processing time correspondence table stored in the delay processing unit 61 to perform MPEG encoding. A delay time Δτ2 equal to the delay time Δτ1 due to the process and the decoding process is calculated, the character signal f is subjected to a delay process by Δτ2, and the character signal f synchronized with the video signal e is output.

  As shown in FIG. 6, the relationship between the coding rate and the delay time is such that the higher the MPEG coding rate, the shorter the delay time. For example, when the MPEG coding rate is 2.7 Mbps, the delay time is 1000 ms, and the MPEG coding rate 14 The delay time is 300 ms at 4 Mbps.

  As a result, the video signal e and the character signal f can be synchronized in accordance with the MPEG encoding rate, so that the display of characters does not deviate in time from the display of video and high-quality character information can be displayed. Is possible.

  As described above, according to the wireless television of the second embodiment, an appropriate delay process can be performed on the character signal f in accordance with the MPEG encoding rate of the encoder 23.

  As a result, there is an advantage that the video signal e and the character signal f can be synchronized to display high-quality character information without time lag.

  Although the case where the video signal e and the character signal f are synchronized on the station 11 side has been described here, the video signal e and the character signal f may be synchronized on the monitor 12 side.

  That is, as shown in FIG. 7, the second communication processing unit 62 of the monitor 12 has a delay processing unit 63 connected between the CPU 47 and the buffer 46.

  The delay processing unit 63 wirelessly receives the MPEG encoding rate data of the encoder 23 from the station 11, and refers to the MPEG encoding rate and processing delay time correspondence table stored in the delay processing unit 63. It is possible to calculate a delay time Δτ2 that is equal to the delay time Δτ1 due to the conversion processing and the decoding processing, perform a delay processing on the character signal f by Δτ2, and output the character signal f synchronized with the video signal e. .

  FIG. 8 is a block diagram showing a configuration of a wireless television station according to the third embodiment of the present invention.

In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different portions are described.
The third embodiment is different from the second embodiment in that the delay processing for the character signal is executed by software.

  That is, as shown in FIG. 8, the first communication processing unit 64 of the station 11 has a delay notification unit 65 having one end connected to the encoder 23 and the other end connected to the CPU 24.

  The delay notification unit 65 receives the MPEG coding rate data from the encoder 23, refers to the correspondence table between the MPEG coding rate and the processing delay time stored in the delay processing unit 65, and performs MPEG coding processing and decoding processing. A delay time Δτ2 equal to the delay time Δτ1 is calculated and notified to the CPU 24.

  The CPU 24 receives the delay time data and executes a delay process by software to output the character signal f delayed by a time Δτ2 equal to Δτ1 to the buffer 27 via the IIC bus (R) 32.

The delay process by software can be performed, for example, by repeatedly executing the wait loop a number of times corresponding to the delay time, but is not particularly limited.
However, since a load is applied to the CPU 24, it is suitable when the MPEG encoding rate is relatively fast or when the character information is relatively small.

  As a result, the character signal f can be delayed by Δτ2 by software to obtain the character signal f synchronized with the video signal e.

  As described above, according to the wireless television of the third embodiment, appropriate delay processing can be applied to the character signal f by software according to the MPEG encoding rate of the encoder 23.

  Therefore, there is no need for a delay circuit for performing delay processing on the character signal, and there is an advantage that the configuration of the first communication processing unit 64 of the station 11 can be simplified.

  Here, the case where the delay processing of the character signal f is performed by software on the station 11 side has been described, but it may be performed on the monitor 12 side.

  That is, as shown in FIG. 9, the second communication processing unit 66 of the monitor 12 has a delay notification unit 67 having one end connected to the CPU 47 and the other end connected to the CPU 42.

  The delay notification unit 67 receives the MPEG encoding rate data of the encoder 23 from the station 11 via the wireless communication line, and refers to the MPEG encoding rate and processing time correspondence table stored in the delay notification unit 67. A delay time Δτ 2 equal to the delay time Δτ 1 due to the MPEG encoding process and the decoding process is calculated and notified to the CPU 42 via the IIC (R) bus 51.

  Since the CPU 42 receives the delay time data Δτ2 and executes the delay process by software, the character signal f is delayed by the time Δτ2, so that the character signal c synchronized with the video signal e can be output to the scaler 43. .

  FIG. 10 is a block diagram illustrating a configuration of a monitor of a wireless television according to the fourth embodiment of the present invention.

  In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different portions are described.

  The fourth embodiment is different from the first embodiment in that the presence or absence of a character signal is detected using an identifier on the monitor side.

  That is, as shown in FIG. 10, the second communication processing unit 70 of the monitor 12 has a slave control unit 71 having one end connected to the CPU 47 and the other end connected to the buffer 46.

  When the slave control unit 71 receives the character signal f from the CPU 47, the slave control unit 71 attaches an identifier indicating that character data exists at the head of the data indicating the character signal f and stores the character data in a predetermined storage area in the buffer 46. To do.

  The CPU 42 as a master periodically reads out an identifier stored in a predetermined storage area in the buffer 46 to determine the presence / absence of character data, and reads character data when character data exists.

  When the character data is read by the CPU 42, the slave control unit 71 resets the identifier to an identifier indicating that character data does not exist.

  FIG. 11 is a diagram showing character data stored in the storage area in the buffer 46, FIG. 11 (a) is a diagram showing a state in which an identifier is added to the head of the character data, and FIG. 11 (b) is a diagram showing the storage area. FIG. 11C is a diagram showing a state where an identifier indicating that character data is present, and FIG. 11C is a diagram illustrating a state where an identifier indicating that character data is not present in the storage area.

As shown in FIG. 11A, an identifier 73 is stored at the head of the storage area 72, and character data 74 is stored next.
As shown in FIG. 11B, when the character data 74 exists in the storage area 72, the identifier 73 is set to “00000001”, for example, and as shown in FIG. When the data 74 does not exist, the identifier 73 is set to “00000000”, for example.

  FIG. 12 is a flowchart showing an operation in which the CPU 42 reads the character data 74 stored in the storage area 72 in the buffer 46.

  As shown in FIG. 12, after waiting for a predetermined time (step S01), the CPU 42 as the master reads the identifier 73 stored in the storage area 72 (step S02) and determines whether or not the character data 74 exists. (Step S03).

If the character data 74 exists (Yes in step S03), the character data 74 is read from the storage area 72 (step S04).
On the other hand, if the character data 74 does not exist in the storage area 72 (No in step S03), the process returns to step S01, and the operations from step S01 to step S04 are repeated until an end request is issued (step S05).

  Thus, the master CPU 42 can detect the presence or absence of the character signal 74 using the identifier 73.

  As described above, according to the monitor 12 of the wireless television of the fourth embodiment, the slave control unit 71 temporarily stores the character data 74 with the identifier 73 in the buffer 46, so that the master CPU 42 stores the identifier 73. It is possible to detect the presence or absence of a character signal.

  As a result, the CPU 42 only needs to read data when character data exists, so that there is an advantage that unnecessary power consumption is reduced and unnecessary data traffic on the IIC (R) bus 51 is reduced. .

  Here, the case where the CPU 42 periodically accesses the second communication processing unit 70 to detect the presence or absence of the character signal has been described. However, only when the second communication processing unit 70 receives character data, the CPU 42 receives the character data. Character data may be transmitted.

  That is, as shown in FIG. 13, the second communication processing unit 75 of the monitor 12 has a master control unit 76 having one end connected to the CPU 47 and the other end connected to the buffer 46.

  FIG. 14 is a flowchart showing an operation in which the master control unit 76 transfers a character signal to the CPU 42.

As shown in FIG. 14, when a wireless signal is received, the master control unit 76 determines whether or not it is a character signal (step S11). If it is a character signal (Yes in step S11), IIC ( R) A character signal is sent to the CPU 42 via the bus 51 (step S12).
On the other hand, when the character signal is not received (No in step S11), the process returns to step S11, and step S11 is repeated until the character signal is received.

  This eliminates the need for the CPU 42 to periodically access the second communication processing unit 75 in order to detect the presence / absence of a character signal, thereby further reducing power consumption and unnecessary on the IIC (R) bus 51. There is an advantage that data traffic is further reduced.

  A wireless television according to a fifth embodiment of the present invention will be described with reference to FIG. FIG. 15 is a block diagram showing the configuration of the station or monitor.

  In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different portions are described.

  The fifth embodiment is different from the first embodiment in that a station or monitor has a signal processing unit having both an encoder mode and a decoder mode, and a mode control unit having both a master control mode and a slave control mode. And a third wireless communication apparatus capable of selecting a mode by an external signal.

  That is, as shown in FIG. 15, the third wireless communication device 80 of this embodiment includes a third communication processing unit 81, a signal processing unit 82 having both encoder and decoder modes, and a command for mode selection. And a mode selection unit 83.

  Communication with the monitor 12 and the input / output unit 84 having a tuner, a signal separation unit, and a video decoder in the third wireless communication device 80, an external input / output device 85 having an antenna for receiving broadcast via the input / output unit 84 The station 11 is configured by connecting an antenna 86 for performing the processing and the CPU 24 for converting the character signal c into the character signal f.

  On the other hand, the third wireless communication device 80 communicates with the station 11 with an input / output unit 84 having a scaler and an output unit, and an external input / output device 85 with a display such as a liquid crystal panel via the input / output unit 84. The monitor 12 is configured by connecting the antenna 86 and the CPU 24 for converting the character signal f into the video signal h.

  The third communication processing unit 81 is connected between the CPU 28 and the buffer 27 and includes a mode control unit 87 including a slave control unit 71 and a master control unit 76, and the signal processing unit 82 includes the encoder 23 and the decoder 41. ing.

  When the mode selection unit 83 receives a mode control signal from the outside via the external signal input terminal 88, the mode selection unit 83 sends a mode switching command to the signal processing unit 82 and the mode control unit 87.

The signal processing unit 82 switches the internal wiring so as to function as either the encoder 23 or the decoder 41 in response to the mode switching command.
Similarly, the mode control unit 87 switches the internal wiring so as to function as either the slave control unit 71 or the master control unit 76 in response to the mode switching command.

  That is, when the third wireless communication device 80 is used as the station 11, an encoder mode for encoding a video signal and a slave control unit mode are selected.

  On the other hand, when the third wireless communication apparatus 80 is used as the monitor 12, the decoding mode for decoding the encoded video signal and either the master control mode or the slave control mode are selected.

  Thereby, the third wireless communication device 80 can operate as either the station 11 or the monitor 12 by selecting the operation mode of the signal processing unit 82 and the mode control unit 87 by an external signal.

  As described above, according to the present embodiment, the third wireless communication device 80 includes the signal processing unit 82 and the mode control unit 87 that can select a mode by an external signal. Any of the monitors 12 can be used.

  As a result, there is no need to prepare dedicated wireless communication devices for wireless television stations or monitors, and there is an advantage that the manufacturing process of the wireless television can be streamlined.

  Furthermore, when the mode control unit 87 functions as the master control unit 76, the CPU 24 does not need to periodically access the third communication processing unit 81 in order to detect the presence or absence of a character signal. As described above, power consumption is reduced and unnecessary data traffic on the IIC (R) bus 51 is further reduced.

  In the above-described embodiments, the case where the wireless communication apparatus is a wireless television has been described. However, the present invention is not limited to this, and wireless communication is performed on a composite signal including video, audio information, and accompanying information such as characters. For example, a two-way videophone may be used.

1 is a block diagram showing a configuration of a wireless television according to Embodiment 1 of the present invention. 1 is a block diagram showing a configuration of a station according to Embodiment 1 of the present invention. 1 is a block diagram showing a configuration of a monitor according to Embodiment 1 of the present invention. The figure which shows the communication method which concerns on Example 1 of this invention. The block diagram which shows the structure of the station which concerns on Example 2 of this invention. The figure which shows the relationship between the coding rate which concerns on Example 2 of this invention, and processing delay time. The block diagram which shows the structure of the monitor which concerns on Example 2 of this invention. The block diagram which shows the structure of the station which concerns on Example 3 of this invention. The block diagram which shows the structure of the monitor which concerns on Example 3 of this invention. The block diagram which shows the structure of the station which concerns on Example 4 of this invention. The figure which shows the structure of the storage area which concerns on Example 4 of this invention. 9 is a flowchart showing a control operation of a station according to Embodiment 4 of the present invention. The block diagram which shows the structure of the monitor which concerns on Example 4 of this invention. 9 is a flowchart showing a control operation of a monitor according to Embodiment 4 of the present invention. The block diagram which shows the structure of the wireless television based on Example 5 of this invention.

Explanation of symbols

10 Wireless TV (wireless communication device)
11 stations (first wireless communication device)
12 Monitor (second wireless communication device)
13, 14, 16, 86 Antenna 15 AV equipment 20 Tuner 21 Signal separation unit 22 Video decoder 23 Encoder 24, 28, 42, 47 CPU
25, 60, 64 First communication processing unit 26, 27, 45, 46 Buffer 29, 48 Baseband processing unit 30, 49 RF processing unit 31, 50 Storage unit 32, 51 IIC bus 40, 62, 66, 70, 75 Second communication processing unit 41 Decoder 43 Scaler 44 Output unit 61, 63 Delay processing unit 65, 67 Delay notification unit 71 Slave control unit 72 Storage area 73 Identifier 74 Character data 76 Master control unit 80 Third wireless communication device 81 Third communication Processing unit 82 Signal processing unit 83 Mode control unit 84 Input / output unit 85 External input / output device 87 Mode selection unit 88 External signal input terminal

Claims (5)

A signal separator that separates a composite signal including video, audio, and accompanying information into the video, audio signal, and the accompanying signal;
An encoding processing unit that performs an encoding process on the separated video and audio signals;
Communication that performs transmission signal processing by adding an identification code to each of the encoded video, audio signal, and the separated accompanying signal, and transmits a composite signal that includes the transmission signal processed video, audio, and accompanying information A processing unit;
A wireless communication apparatus comprising: A signal separator that separates a composite signal including video, audio, and accompanying information into the video, audio signal, and the accompanying signal;
An encoding processing unit that performs an encoding process on the separated video and audio signals;
First, an identification code is attached to each of the encoded video, audio signal, and the separated accompanying signal, transmission signal processing is performed, and a composite signal including the transmission signal processed video, audio, and accompanying information is transmitted. 1 communication processing unit;
A first wireless communication device comprising:
Receiving the transmitted composite signal, subjecting the received composite signal to reception signal processing based on the identification code, and reproducing the encoded video, audio signal and the separated accompanying signal; A communication processing unit;
A decoding processing unit that performs a decoding process on the encoded video and audio signals;
An output unit that synthesizes the decoded video and audio signals and the separated accompanying signal, and outputs the synthesized signal to a display unit;
A second wireless communication device having
A wireless communication apparatus comprising:   3. The delay processing unit according to claim 1, further comprising: delay processing means for causing the accompanying signal to generate a delay equal to a delay generated when the video or audio signal is encoded or decoded. The wireless communication device described.   When the second wireless communication device receives the accompanying information from the first wireless device, the second wireless communication device writes the accompanying information with an identifier indicating the presence of the accompanying information in a predetermined storage area, and the output unit When the accompanying information is read, when the accompanying information is received from a slave control unit that rewrites an identifier indicating the presence of the accompanying information to an identifier indicating the absence of the accompanying information, or when the accompanying information is received from the first wireless communication device, the output unit The wireless communication apparatus according to claim 2, further comprising a master control unit that writes the accompanying information. The first and second wireless communication apparatuses are both in an encoding processing mode in which encoding processing is performed on the video and audio signals and a decoding processing mode in which decoding processing is performed on the encoded video and audio signals. A signal processing unit capable of selecting the mode by an external signal, and a mode control unit having both the slave control mode and the master control mode and capable of selecting the mode by an external signal; Each with
In the first wireless communication device, the encoding processing mode and the slave control mode are selected,
5. The wireless communication device according to claim 2, wherein the decoding processing mode and the slave control mode or the master control mode are selected in the second wireless communication device.

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