JPH10173571A - Radio video signal transmitting and receiving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio video signal transmitting/receiving device which is not required to deal with the signals of an extremely wide band even in a spectrum spread system and also can use the general-purpose parts, etc., to construct a modulation part and a demodulation part. SOLUTION: An image pickup part 1 outputs the digital video signals, and an encoding part 2 applies the band compression to the output signals of the part 1 to encode them into a bit stream of an MPFG format. A time base compression part 3 applies the time base compression to the band compressed signals received from the part 2 and then outputs these signals at an optional transmitting speed when they total to a fixed number. Thus, the idle time is produced between the data and a packet conversion part 4 converts the signals that undergone the time base compression into a radio transmitting packet. A modulation part 6 modulates the transmitting packet by a spectrum diffusion system and transmits it by radio via an antenna 7. When the video signals are received from the opposite party side, the spectrum diffusion signals are received via the antenna 7 and a demodulation part 8 adversely diffuses and demodulates the received signals. The signals outputted from the part 8 are converted into the bit stream of an MPFG format that undergone the time base compression via a packet conversion part 9 and then undergo the time base expansion via a time base expansion part 10. Then the bit stream is decoded at a bit stream decoding part 11 and shown by a display device 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless video signal transmitting / receiving apparatus for wirelessly transmitting / receiving video signals, and more particularly to a wireless video transmitting / receiving apparatus using a spread spectrum system.

[0002]

2. Description of the Related Art A conventional example of wirelessly communicating a video signal using a spread spectrum method is disclosed in JP-A-7-50614.
There is a wireless video signal processing device described in Japanese Unexamined Patent Application Publication No. H11-163,873. When transmitting a video signal by wire between the imaging unit and the signal recording unit, the imaging unit and the signal recording unit may be arranged in the same device,
Since it is necessary to carry the imaging unit and the signal recording unit together, the size of the entire device connected by wire increases, and there is a limit to miniaturization. To solve this problem, Japanese Patent Laid-Open Publication No.
In the apparatus disclosed in Japanese Patent No. 0614, the imaging unit and the signal recording unit are separated from each other, and a video signal is wirelessly transmitted between the respective devices to reduce the size and to prevent interference with other devices. The purpose is to realize a small number of configurations.

FIG. 6 is a schematic configuration diagram of a wireless video signal processing device described in the above publication. In FIG. 6, reference numeral 60 denotes a PN code (pseudo-noise code) generator, and 61 denotes a SAW (surface acoustic wave) matched filter.

In the image pickup unit, a video signal input from the image pickup device is converted into a digital signal (14 MHz) by an A / D converter.
z) and mixed directly with the output of the PN code generator 60 to perform direct spreading. As the PN code, a 127-bit m-sequence code is used.

Next, the spread video signal is up-converted to a center frequency of 3.6 GHz, amplified by an amplifier, and output wirelessly from an antenna. As described above, if the spectrum is transmitted after being spread, since the signal is effectively a low level signal, it does not interfere with other devices.

[0006] In the signal recording section, the signal input from the antenna is amplified by an amplifier and passed through a SAW matched filter 61 to be converted into a 14 MHz impulse-like correlation signal. Then, the output signal from the SAW matched filter 61 is converted into a digital signal by a pulse discriminating circuit. After that, it is recorded on a VTR or the like as a digital signal or an analog signal. As described above, the video signal processing device described in the above publication is configured to separate the imaging unit and the signal recording unit and transmit the video signal to the signal recording unit wirelessly.

[0007]

However, in the prior art described in the above-mentioned publication, the signal is spread over a wide band by the spread spectrum method and the communication is performed. Is too wide and communication becomes difficult.

In the conventional example described in the above publication, a video signal input from an image pickup device is converted into a digital signal, the digital signal is divided into ten, and a signal band is set to 1.4 MHz by a time base expansion circuit. Then, the signals are directly spread by mixing with the outputs of different PN code generators, and are passed through SAW matched filters corresponding to the ten types of PN codes and the center frequency to be converted into impulse-like correlation signals. The signal is converted into a digital signal by the judgment circuit. Furthermore, a configuration is described in which each signal is time-compressed by a time-axis compression circuit and then added by a data synthesis circuit. However, this configuration has a problem that the circuit scale becomes relatively large.

Further, when wireless transmission is performed by the spread spectrum method, use of weak power or specific low power is considered, so that a spread spectrum signal in a normal use environment may interfere with other devices. There is a problem
In some cases, images of sufficient quality cannot be obtained during reception.

An object of the present invention is to eliminate the need to handle an extremely wide band signal even when the spread spectrum system is used.
An object of the present invention is to realize a wireless video signal transmission / reception device in which a modulation unit and a demodulation unit can be configured by general-purpose components and the like.

Another object of the present invention is to provide a wireless video signal transmitting / receiving apparatus capable of obtaining a high-quality image with little image quality deterioration on the receiving side even if interference is received from another device during wireless transmission. It is to realize.

[0012]

[Means for Solving the Problems]

(1) In order to achieve the above object, the present invention is configured as follows. That is, in the wireless video signal transmission device, an imaging unit that photoelectrically converts input light to output a video signal, an encoding unit that compresses and encodes the information amount of the video signal in a digital band, A time axis compressing section for compressing the output digital band compressed signal on a time axis, and converting the time axis compressed digital band compressed signal output from the time axis compressing section into a packet for wireless transmission,
A packet conversion unit that matches the transmission speed with the transmission speed of the wireless transmission section; a modulation unit that modulates a signal output by the packet conversion unit by a spread spectrum method; and wirelessly transmits a spread spectrum transmission signal output by the modulation unit. A transmission unit and a communication control unit that controls the operation of the packet conversion unit are provided.

Since the information amount of the video signal is compressed by the encoding unit before the spread spectrum is performed by the modulation unit, the bandwidth of the spread spectrum signal can be reduced. There is no need to handle wideband signals.

Since the idle time can be generated by the time axis compression processing by the time axis compressing section, the signal output from the time axis compressing section is converted into a radio transmission packet by the packet converting section during the idle time. Since the signal is converted and the transmission speed of the signal is made to match the transmission speed of the wireless transmission section, signal processing can be performed with high efficiency.

(2) In the wireless video signal transmitting / receiving apparatus, an imaging unit for photoelectrically converting input light to output a video signal, and an encoding unit for compressing and encoding the information amount of the video signal in a digital band. A time axis compressing section for compressing the digital band compressed signal output from the encoding section on the time axis, and converting the time axis compressed digital band compressed signal output from the time axis compressing section to a wireless transmission packet,
A first packet converter for making the transmission rate equal to the transmission rate of the wireless transmission section, a modulator for modulating a signal output from the first packet converter by a spread spectrum method, and a spread spectrum output from the modulator. A transmitting unit that wirelessly transmits a transmission signal; a receiving unit that receives a wirelessly transmitted spread spectrum transmission signal; a demodulation unit that demodulates the spread spectrum transmission signal received by the receiving unit; A second packet converter for converting the trust packet into a digital band compressed signal that has been time-axis-compressed and matching the transmission speed with the data transmission speed to be transmitted to the time-axis decompression processor; A time axis extending unit for extending the time axis compressed digital band compressed signal to be outputted, and a digital signal outputted by the time axis extending unit. A decoding unit that decodes the compressed region signal, a display device that displays an image using the image signal decoded by the decoding unit, and controls the first packet conversion unit and the second packet conversion unit. And a communication control unit.

Since the information amount of the video signal is compressed by the encoding unit before the spectrum is spread by the modulation unit, the bandwidth of the spread spectrum signal can be reduced. There is no need to handle wideband signals.

Further, since the idle time can be generated by the time axis compression processing by the time axis compression section, the signal output from the time axis compression section is transmitted wirelessly by the first packet conversion section during the idle time. Since the signal is converted into a trust packet and the transmission speed of the signal is made equal to the transmission speed of the wireless transmission section, signal processing can be performed with high efficiency.
The signal processing is performed as described above, and the spread spectrum transmission signal transmitted wirelessly is received by the receiving unit, and is transmitted via the demodulation unit, the second packet conversion unit, the time axis decompression unit, and the decoding unit. The image is supplied to the display device and displayed on the screen.

(3) Further, in the wireless video signal transmitting apparatus, an imaging unit for photoelectrically converting input light to output a video signal, an audio input unit for inputting audio and converting it into an audio signal,
An encoding unit for compressing and encoding the information amount of the video signal and the audio signal in a digital band, a time axis compressing unit for compressing a digital band compressed signal output from the encoding unit in a time axis, and a time axis compressing unit A packet converter for converting the time-axis-compressed digital band compressed signal output from the transmitter into a packet for wireless transmission, and matching the transmission rate with the transmission rate of the wireless transmission section; and a spread spectrum signal output from the packet converter. A modulation unit that modulates by a scheme, a transmission unit that wirelessly transmits a spread spectrum transmission signal output by the modulation unit, and a communication control unit that controls the operation of the packet conversion unit are provided.

Since the information amount of the video signal and the audio signal is compressed by the encoding unit before the spread spectrum is performed by the modulation unit, the bandwidth of the spread spectrum signal can be reduced, and the spread spectrum method is used. However, there is no need to handle extremely wideband signals.

Further, since the idle time can be generated by the time axis compression processing by the time axis compressing section, the signal output from the time axis compressing section is converted into the radio transmission packet by the packet converting section during the idle time. Since the signal is converted and the transmission speed of the signal is made to match the transmission speed of the wireless transmission section, the video signal and the audio signal can be processed with high efficiency.

(4) In the wireless video signal transmitting and receiving apparatus, an image pickup unit for photoelectrically converting input light to output a video signal, an audio input unit for inputting audio and converting it into an audio signal,
An encoding unit for compressing and encoding the information amount of the video signal and the audio signal in a digital band, a time axis compressing unit for compressing a digital band compressed signal output from the encoding unit in a time axis, and a time axis compressing unit A first packet converter for converting the time-axis-compressed digital band compressed signal output by the first unit into a packet for wireless transmission, and matching the transmission speed with the transmission speed in the wireless transmission section; and a first packet converter. A modulation unit that modulates an output signal by a spread spectrum method, a transmission unit that wirelessly transmits a spread spectrum transmission signal output by the modulation unit, a reception unit that receives a wirelessly transmitted spread spectrum transmission signal, A demodulation unit for demodulating a transmission signal, and converting a radio transmission packet output from the demodulation unit into a digital band compressed signal that has been time axis compressed. Together it is, first to match the data transmission rate for transmitting the transmission rate to the time axis expansion processing side 2
, A time-axis expanding unit for expanding the time-axis-compressed digital band compressed signal output from the second packet converting unit, and a digital band-compressed signal output from the time-axis expanding unit. A decoding unit, a display device for displaying video using the video signal decoded by the decoding unit, and an audio output unit for outputting audio using the audio signal decoded by the decoding unit. , A communication control unit for controlling the first packet conversion unit and the second packet conversion unit.

Before the spread spectrum in the modulation section, the information amount of the video signal and the audio signal is compressed in the coding section, so that the bandwidth of the spread spectrum signal can be reduced, and the spread spectrum method is used. However, there is no need to handle extremely wideband signals.

Further, since the idle time can be generated by the time axis compression processing by the time axis compression section, the signal output from the time axis compression section is transmitted wirelessly by the first packet conversion section during the idle time. Since it is converted into a trust packet and the transmission speed of the signal is made to match the transmission speed of the wireless transmission section, the signal processing of the video signal and the audio signal can be performed with high efficiency.

Then, the signal is processed as described above,
The wirelessly transmitted spread spectrum transmission signal is received by the receiving unit, and is supplied to the display device or the audio output unit via the demodulation unit, the second packet conversion unit, the time axis decompression unit, and the decoding unit, Display and audio output.

(5) Preferably, the above (2) or (4)
An error correction encoding unit that adds an error correction code to the wireless transmission packet during transmission, and an error correction decoding unit that performs error correction on the wireless transmission packet received by the reception unit and to which the error correction code is added during reception. And a unit.

An error correction code is added to a signal converted into a packet for wireless transmission by an error correction coding unit in the idle time generated by the time axis compression processing. Then, on the receiving side, an error correction decoding unit for decoding the error correction code is added, so that the influence of a transmission path error occurring on a wireless transmission path can be reduced.

(6) Preferably, in (5), an interleave processing unit for changing the arrangement of data output from the error correction encoding unit, and A deinterleaving unit for returning the changed data array to the original data array.

Since the data arrangement is changed by the interleave processing unit, even if a burst error occurs during transmission, the burst error becomes scattered by returning to the original data arrangement by the deinterleaving unit on the receiving side. The error correction decoding unit can correct the error.

(7) Preferably, the above (2),
In (4), (5), or (6), the transmitting unit and the receiving unit are shared to form a single transmitting / receiving unit.

(8) Preferably, in the above (7), a switch is provided between the transmission / reception section and the modulation section and the demodulation section so that the reception mode and the transmission mode can be switched.

[0031]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the embodiment described below, since the description will be made on the premise of full-duplex communication, different spreading codes are used in the modulation unit and the reception unit in the wireless video signal transmitting / receiving apparatus.

FIG. 1 is a block diagram of a wireless video signal transmitting / receiving apparatus according to a first embodiment of the present invention. In the figure, 1 is an imaging unit, 2 is an encoding unit, 3 is a time axis compression unit, 4
Is a packet converter, 5 is a communication controller, 6 is a modulator, 7 is an antenna, 8 is a demodulator, 9 is a packet converter, 10 is a time base expander, 11 is a decoder, and 12 is a display device. .

An image pickup unit 1 including an image pickup device such as a CCD (Charge Coupled Device), an amplifier circuit, an A / D conversion circuit, a signal processing circuit and the like photoelectrically converts input light and outputs a digital video signal. The signal processing circuit of the imaging unit 1 performs known signal processing such as filtering, enhancement, gamma correction, and white balance on the digitized video signal. Further, the signal processing circuit converts the digitized video signal into an intermediate format necessary for the next encoding. This intermediate format depends on the encoding method performed by the encoding unit 2.

In the first embodiment, the MPEG (Movi)
SIF (Source Input Format) is used for encoding by the NG Picture Experts Group. MPE
Encoding other than G, for example, H.264 for communication. When encoding according to the H.261 standard, CIF (Common Intermediat
e Format) or QCIF (Quarter CIF). The encoding unit 2 compresses and encodes the information of the video signal output from the imaging unit 1 by digital band compression, and outputs it as a binary signal.

The encoding by the encoding unit 2 is performed in a format according to MPEG. There are MPEG1 and MPEG2 schemes with different compression ratios in MPEG encoding. In this embodiment, a video signal is encoded using MPEG1 to 1.5
Compress to Mbps. Also, in this embodiment, the MPE
The configuration for realizing the G encoding conforms to a general configuration, and a detailed description of the encoding unit 2 will be omitted.

The digital band compression signal output from the encoding unit 2 is supplied to a time axis compression unit 3, and the time axis compression unit 3 performs time axis compression processing. In the time axis compression process, an arbitrary data amount (for example, 32 kbytes) is stored in the buffer memory by the buffer memory and the control circuit in the time axis compression unit 3 and, when the data amount becomes constant, an arbitrary transmission rate is set by the control circuit. (13.5 Mbps as an example). Since data is output after a certain amount of data is output, there is a free time between data blocks. As will be described later, this idle time is applied to packet conversion, error correction code addition, and interleaving processing.

The signal output from the time axis compression unit 3 is transmitted wirelessly from the bit stream in the MPEG format which has been time axis compressed by the packet conversion unit 4 controlled by the communication control unit 5 using the idle time described above. The signal is converted into a trust packet, and the transmission rate of the signal is made equal to the transmission rate of the wireless transmission section (for example, 1.5 Mbps).

The signal output from the packet converter 4 is PN
The signal is modulated by a spread spectrum system (for example, direct spread) by a modulation unit 6 including a code (pseudo noise code) generator, a mixer, a modulator, a transmitter, an amplifier circuit, and the like. The spread spectrum signal output from the modulation unit 6 is transmitted to the antenna 7
Is transmitted wirelessly.

On the other hand, when receiving a video signal transmitted by the other party, the antenna 7 receives a spread spectrum signal. The spread spectrum signal received by the antenna 7 is
The signal is despread by a demodulation unit 8 including an amplification circuit, a SAW (surface acoustic wave) matched filter, a pulse discrimination circuit, and the like, and is demodulated into a signal of a wireless transmission packet.

The signal output from the demodulation unit 8 is transmitted to the communication control unit 5
The packet conversion unit 9 controls the packet for wireless transmission to convert the packet for wireless transmission into a bit stream in the MPEG format compressed on the time axis, and transmits the transmission rate to the time axis decompression processing side. Matched with data transmission speed. The time axis decompression unit 10 executes a time axis decompression process on the bit stream in the MPEG format that has been time axis compressed and output from the packet conversion unit 9.

1.5M output from the time axis extending unit 10
The bit stream in bps MPEG format is
The data is decoded by the decoding unit 11. In the first embodiment, since the configuration of the decoding unit 11 conforms to a general configuration for implementing MPEG decoding, detailed description of the decoding unit 11 is omitted. The video signal decoded by the decoding unit 11 is displayed as an image using the display device 12. Display device 1
Although a detailed configuration of 2 is not shown, as an example, a digital video signal may be inputted and displayed on a liquid crystal display.

As described above, according to the first embodiment of the present invention, before the spectrum is spread by the modulator 6,
Since the information amount of the video signal is compressed by the encoding unit 2, the bandwidth of the spread spectrum signal can be reduced,
Even if the spread spectrum method is used, there is no need to handle an extremely wide band signal, and a wireless video signal transmitting / receiving apparatus in which a modulation unit and a demodulation unit can be configured by general-purpose components or the like can be realized.

An idle time is generated by the time axis compression process, the signal output from the time axis compression unit 3 is converted into a packet for wireless transmission during the idle time, and the transmission speed of the signal is reduced to the wireless transmission interval. Therefore, signal processing can be performed with high efficiency.

FIG. 2 is a block diagram of a wireless video signal transmitting / receiving apparatus according to a second embodiment of the present invention. In the figure, parts performing the same operations as those in the embodiment shown in FIG. 1 are denoted by the same reference numerals, and the description of the operations will be omitted. Then, in the example of FIG. 2, a voice input unit 20 and a voice output unit 21 are added to the example of FIG. 1, and other configurations are the same.

In FIG. 2, an audio signal from an audio input unit 20 composed of a microphone, an amplification circuit and the like is supplied to an encoding unit 2 and encoded by the encoding unit 2. Then, the encoded audio signal is output to the time axis compression unit 3.
, And is packet-converted by the packet converter 4, modulated by the modulator, and transmitted wirelessly from the antenna 7.

The audio signal transmitted by the other party is received by the antenna 7, demodulated by the demodulation unit 8, and transmitted via the packet conversion unit 9 and the time axis expansion unit 10 to the decoding unit 1.
1 is supplied. The decoding unit 11 decodes the encoded audio signal. The audio signal decoded by the decoding unit 11 is supplied to an audio output unit 21 including an amplifier, a speaker, and the like, and the audio output unit 21 outputs an audio according to the supplied audio signal. You.

As described above, according to the second embodiment of the present invention, not only the video signal but also the audio signal can obtain the same effect as that of the first embodiment. It is possible to realize a wireless video signal transmission / reception device capable of performing highly efficient communication with the video and audio.

FIG. 3 is a block diagram of a wireless video signal transmitting / receiving apparatus according to a third embodiment of the present invention. In the figure, parts performing the same operations as those in the embodiment shown in FIG. 2 are denoted by the same reference numerals, and the description of the operations will be omitted. Then, in the example of FIG. 3, an error correction encoding unit 30 and an error correction decoding unit 31 are added to the example of FIG. 2, and other configurations are the same.

In FIG. 3, the output signal from the packet converter 4 is supplied to an error correction encoder 30. next,
Under the control of the communication control unit 5 in the error correction encoding unit 30, an error correction code such as a Reed-Solomon code is added for each specific block (or byte), and a wireless transmission packet is configured. Then, by the modulation unit 6 and the antenna 7,
The video signal and the like and the error correction code are transmitted at a total transmission speed of about 2 Mbps. As described above, the idle time generated by the time axis compression processing is converted into a wireless transmission packet and an error correction code is added.

On the receiving side, the packet for radio transmission demodulated by the demodulation unit 8 is subjected to error correction by the error correction decoding unit 31 under the control of the communication control unit 5 and then transmitted from the packet conversion unit 9. It is output as an MPEG format bit stream that has been time axis compressed. Thereafter, the output signal from the packet conversion unit 9 is output to the time axis expansion unit 10,
The display device 12 or the audio output unit 2 via the decoding unit 11
1 is supplied.

As described above, according to the third embodiment of the present invention, the same effects as those of the second embodiment can be obtained, and the error correction encoding unit 30 and the error correction decoding unit 31 Is added, it is possible to realize a wireless video signal transmitting / receiving apparatus capable of reducing the influence of a transmission path error occurring in a wireless transmission path.

FIG. 4 is a block diagram of a wireless video signal transmitting / receiving apparatus according to a fourth embodiment of the present invention. In the figure, parts performing the same operations as those in the embodiment shown in FIG. 3 are denoted by the same reference numerals, and the description of the operations will be omitted. Then, in the example of FIG. 4, an interleave processing unit 40 and an interleave release unit 41 are added to the example of FIG. 3, and other configurations are the same.

In the third embodiment described above, when an error exceeding the error correction capability occurs,
The error correction code does not work. However, errors often occur in bursts over several bits of the information signal. For this reason, even when the error rate when the entire transmitted video signal is viewed is low, error correction may not be possible when an error occurs in a burst.

In the fourth embodiment, when an error occurs in a burst as described above, the error is dispersed by performing interleaving to prevent the error from being corrected. In the idle time generated by the time axis compression processing, the packet is converted into a packet for wireless transmission and interleaving processing is performed.

FIG. 5 shows an example of interleaving.
In FIG. 5, reference numeral 50 denotes a memory. For easy understanding of the operation, writing and reading to and from the memory 50 are two-dimensional examples. The communication controller 5 controls writing and reading to and from the memory 50.

The error correction coding unit 3 shown in FIG.
0, signals a0 to an, b0 to bn, c0 to cn,
The interleave processing unit 40 writes d0 to dn and e0 to en in the horizontal direction (row direction) indicated by an arrow in FIG.
Then, it is read and transmitted in the vertical direction (column direction) indicated by the arrow. Therefore, the data array after interleaving has a0 to e0, a1 to e1,
a2 to e2,..., an to en.

On the receiving side, the signal is completely returned to the original arrangement by the reverse operation of the interleave processing unit 40 by the deinterleave unit 41, that is, by writing data in the memory in the column direction and reading data in the row direction. On the other hand, burst errors received during transmission can be restored by returning the data to the original sequence.
Since the data is scattered, the error correction decoding unit 31 can correct the error.

As described above, according to the present embodiment,
In addition to the same effects as in the third embodiment, the effect of the burst error can be reduced even in an environment where a burst error occurs in the wireless transmission path, and the image quality degradation and the like can be reduced as compared with the third embodiment. A small number of wireless video signal transmitting and receiving devices can be realized.

In another embodiment, the modulator 6 and the antenna 7 are disposed between the modulator 6 and the demodulator 8 and the antenna 7.
There is an example in which a switch is arranged to switch between the connection of the demodulation unit 8 and the antenna 7 and the same spread code is used for transmission and reception, and half-duplex communication is performed. in this case,
The switching of the switch is performed by the communication control unit 5. The example of performing the half-duplex communication is applicable to the first to fourth embodiments.

Although the above-described example is an example of a wireless video signal transmitting / receiving apparatus in which a transmitting apparatus and a receiving apparatus are integrated, the present invention provides a wireless video signal transmitting / receiving apparatus having only a transmitting-side function among the above-described configurations. It is possible to realize a video signal transmission device. Further, among the above-described configurations, it is also possible to realize a wireless video signal receiving device having only a function on the receiving side.

In the embodiments described above, the MPEG coding is used for the image band compression coding and the direct spread is used for the spread spectrum system. A similar effect can be obtained by applying the present invention to compression coding or a spread spectrum method (such as frequency hopping).

[0062]

Since the present invention is configured as described above, it has the following effects. Before the spread spectrum in the modulation section, the information amount of the video signal is compressed in the coding section, so the bandwidth of the spread spectrum signal can be reduced. It is possible to realize a wireless video signal transmission / reception device that does not need to handle signals and can configure the modulation unit and the demodulation unit with general-purpose components and the like.

Since the idle time can be generated by the time axis compression processing by the time axis compressing section, the signal output from the time axis compressing section is converted into a radio transmission packet by the packet converting section during the idle time. Since the signal is converted and the transmission speed of the signal is made to match the transmission speed of the wireless transmission section, signal processing can be performed with high efficiency.

Further, an error correction code is added to a signal converted into a packet for wireless transmission by an error correction coding section in the idle time generated by the time axis compression processing, and the error correction code is decoded on the receiving side. If the configuration is such that an error correction decoding unit is added, the effect of a transmission path error occurring in a wireless transmission path can be reduced, and a higher quality image can be transmitted.

Also, an interleave processing section for changing the arrangement of data output from the error correction encoding section, and an interleave for returning the arrangement of data changed before being input to the error correction decoding section to the original data arrangement. If the deinterleaving unit is further provided, the data arrangement is changed by the interleave processing unit. Therefore, even if a burst error occurs during transmission, the data array is returned to the original data arrangement by the deinterleaving unit on the receiving side. As a result, the burst errors are scattered, so that the error correction decoding unit can correct the errors. This makes it possible to transmit a higher quality image.

[Brief description of the drawings]

FIG. 1 is a block diagram of a wireless video signal transmitting / receiving apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a wireless video signal transmitting / receiving apparatus according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a wireless video signal transmitting / receiving apparatus according to a third embodiment of the present invention.

FIG. 4 is a block diagram of a wireless video signal transmitting / receiving apparatus according to a fourth embodiment of the present invention.

FIG. 5 is an explanatory diagram of an example of signal interleaving in a fourth embodiment according to the present invention.

FIG. 6 is a block diagram showing an example of a conventional wireless video signal transmitting / receiving apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Image pick-up part 2 Encoding part 3 Time axis compression part 4 Packet conversion part 5 Communication control part 6 Modulation part 7 Antenna 8 Demodulation part 9 Packet conversion part 10 Time axis expansion part 11 Decoding part 12 Display device 20 Audio input part 21 Audio Output unit 30 Error correction encoding unit 31 Error correction decoding unit 40 Interleave processing unit 41 Deinterleave unit 50 Memory

Claims (8)

[Claims] An image pickup unit for photoelectrically converting input light to output a video signal, an encoding unit for compressing and encoding the information amount of the video signal in a digital band, and a digital band output from the encoding unit. A time axis compressing section for compressing the compressed signal on a time axis, and converting the time axis compressed digital band compressed signal output from the time axis compressing section into a packet for wireless transmission, and adjusting the transmission rate to the transmission rate of the wireless transmission section. A packet converter for matching, a modulator for modulating a signal output from the packet converter by a spread spectrum method, a transmitter for wirelessly transmitting a spread spectrum transmission signal output from the modulator, and an operation of the packet converter. And a communication control unit for controlling the communication. 2. An imaging unit for photoelectrically converting input light to output a video signal, an encoding unit for compressing and encoding the information amount of the video signal in a digital band, and a digital band output by the encoding unit. A time axis compressing section for compressing the compressed signal on a time axis, and converting the time axis compressed digital band compressed signal output from the time axis compressing section into a packet for wireless transmission, and adjusting the transmission rate to the transmission rate of the wireless transmission section. A first packet converter for matching, a modulator for modulating a signal output from the first packet converter by a spread spectrum method, a transmitter for wirelessly transmitting a spread spectrum transmission signal output from the modulator, A receiving unit that receives a radio-transmitted spread spectrum transmission signal, and a demodulation unit that demodulates the spread spectrum transmission signal received by the receiving unit.
A second packet conversion unit that converts the wireless transmission packet output by the demodulation unit into a digital band compressed signal that has been time-axis-compressed, and matches the transmission speed with the data transmission speed to be transmitted to the time-axis expansion processing side; A time axis extending section for extending the time axis compressed digital band compressed signal output from the second packet converting section, and a decoding section for decoding the digital band compressed signal output from the time axis extending section. A display device for displaying an image using the video signal decoded by the decoding unit, and a communication control unit for controlling the first packet conversion unit and the second packet conversion unit. Wireless video signal transmitting and receiving device. 3. An image pickup unit for photoelectrically converting input light to output a video signal, an audio input unit for inputting audio and converting the input light into an audio signal, and digitally compressing the information amount of the video signal and the audio signal. A time axis compression section for compressing the digital band compressed signal output from the encoding section in the time axis, and a radio signal from the time axis compressed digital band compressed signal output from the time axis compression section. A packet converter that converts the transmission rate into a packet for transmission and matches the transmission rate with the transmission rate of the wireless transmission section, a modulator that modulates a signal output by the packet converter by a spread spectrum method, and an output from the modulator. A wireless video signal transmission device, comprising: a transmission unit that wirelessly transmits a spread spectrum transmission signal; and a communication control unit that controls an operation of the packet conversion unit. 4. An image pickup unit for photoelectrically converting input light to output a video signal, an audio input unit for inputting audio and converting the input light into an audio signal, and digitally compressing the information amount of the video signal and the audio signal. A time axis compression section for compressing the digital band compressed signal output from the encoding section in the time axis, and a radio signal from the time axis compressed digital band compressed signal output from the time axis compression section. A first packet converter that converts the transmission rate into a packet for transmission and matches the transmission rate with the transmission rate of the wireless transmission section, a modulator that modulates a signal output by the first packet converter by a spread spectrum method, A transmitting unit that wirelessly transmits the spread spectrum transmission signal output by the modulation unit, a receiving unit that receives the wirelessly transmitted spread spectrum transmission signal, and the spread spectrum transmission signal. A demodulation unit for demodulating the data, and converting the wireless transmission packet output by the demodulation unit into a digital band compressed signal compressed on the time axis, and matching the transmission rate with the data transmission rate transmitted to the time axis decompression processing side. 2 packet converter, a time base expander for time base expanding the time base compressed digital band compressed signal output from the second packet converter, and a digital band compressed signal output from the time base expander. A decoding unit for decoding;
A display device for displaying an image using the video signal decoded by the decoding unit, an audio output unit for outputting audio using the audio signal decoded by the decoding unit, and the first packet conversion unit A wireless video signal transmitting / receiving apparatus comprising: a communication unit that controls a second packet conversion unit. 5. The wireless video signal transmitting / receiving apparatus according to claim 2, wherein an error correction coding unit for adding an error correction code to said wireless transmission packet during transmission, and an error correction code received by said receiving unit during reception. An error correction decoding unit for correcting the error of the wireless transmission packet to which the code is added,
A wireless video signal transmitting / receiving device, further comprising: 6. The wireless video signal transmitting and receiving apparatus according to claim 5, wherein an interleave processing unit for changing an arrangement of data output from said error correction encoding unit, and an input signal before being input to said error correction decoding unit. A wireless video signal transmission / reception device, further comprising: an interleave release unit for returning the changed data arrangement to the original data arrangement. 7. The wireless video signal transmitting / receiving apparatus according to claim 2, wherein said transmitting section and said receiving section are shared to form a single transmitting / receiving section. Transceiver. 8. The wireless video signal transmitting / receiving apparatus according to claim 7, wherein a switch is provided between said transmitting / receiving section and said modulating section and demodulating section so as to be able to switch between a receiving mode and a transmitting mode. Video signal transmitting and receiving device.