JPH0955874A - Imaging device with wireless transmission function - Google Patents

Abstract

(57) [Abstract] [Purpose] In an imaging device, an imaging unit and a signal recording unit are separated, and communication of information between each other is performed using a wireless system in which interference or obstruction is less likely to occur. [Structure] An image pickup means 11 for photographing an image, a compression means 12 for compressing a video signal, and a transmitting means 13 for transmitting.
, A receiving unit 21 for receiving the transmitted information, and a decompressing unit 2 for decompressing the received signal.
It is composed of a receiving unit 2 having two. Each of the signal processing means performs signal compression and decompression processing so that communication between the transmission unit 1 and the reception unit 3 is performed using a spread spectrum system. [Effect] By performing compression / expansion processing of the video signal, it is possible to perform the communication of the video signal using spread spectrum communication, which has a low signal level and has little influence on other devices. This makes it possible to separate the image pickup unit, the signal recording unit, and the image display unit, and to downsize the image pickup unit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image pickup apparatus having a wireless transmission function for performing communication using a spread spectrum system.

[0002]

2. Description of the Related Art In an image pickup apparatus, transmission of a video signal shot by an image pickup unit is performed by using a wire as shown in Japanese Patent Laid-Open No. 53-113419. Therefore, the image pickup unit, the signal recording unit, and the video display unit are arranged in the same device or connected by a wire, so that the entire device becomes large and it is difficult to miniaturize it. In order to solve this problem, Japanese Patent Laid-Open No. 07-050614 proposes a system in which an image pickup unit, a signal recording unit, and a video display unit are separated, and signals are wirelessly communicated. In the above system, a spread spectrum method is used as a communication method in order to perform communication with little interference or interference.

[0003]

However, the current transmission rate of the communication using the spread spectrum method is about 2 Mbps, and it is difficult to communicate a video signal requiring a transmission rate of 100 Mbps or more.

The present invention has been made in view of the above problems and provides means for solving the problems.

[0005]

In order to solve the above problems, the present invention solves the above problems by a transmitting unit having an image pickup means for photographing an image and a transmitting means for transmitting a signal, and a receiver for receiving a transmitted signal. Communication means comprising a receiving unit having means, the transmitting unit including compression means for compressing the signal output by the image pickup means, and the receiving unit including decompression means for decompressing the signal output by the receiving means. An image pickup apparatus having a wireless transmission function using a spread spectrum method is provided.

[0006]

With the above construction, the image signal is obtained by the image pickup means, the image signal is compressed by the compression means, the compressed signal is communicated by the transmission means in the spread spectrum system, and the communicated signal is The signal received by the receiving means is expanded by the expanding means and output as a video signal.

By thus compressing the video signal by the compression means, the amount of information can be reduced, interference and obstruction are less likely to occur and received, and the signal concealing ability is high and the spread spectrum method is difficult to be intercepted. It becomes possible to communicate within the transmission rate.

[0008]

EXAMPLES Examples of the present invention will be shown.

FIG. 1 is a block diagram of an image pickup apparatus having a wireless transmission function according to the present invention. 1 is a transmission unit,
The imaging unit 11, the compression unit 12, and the transmission unit 13 are included.
A lens block 111 performs autofocus control, auto iris control, and zoom control according to a control signal from the lens control unit 112. Reference numeral 113 denotes a CCD, which converts the light passing through the lens block 111 into an electric signal. A CDS and AGC circuit 114 removes noise from the video signal obtained by the CCD 113 and amplifies the gain. Reference numeral 115 is an A / D conversion circuit, which is a CDS, AGC
The signal obtained from the circuit 114 is converted into a digital signal. A digital signal processing LSI 116 performs signal processing such as auto white balance control and electronic zoom control on the signal obtained from the A / D conversion circuit 115.
Reference numeral 121 denotes a compression circuit, which is a digital signal processing LSI 116.
The signal obtained from is compressed. Known compression methods include MPEG1 and MPEG2. When MPEG1 is used in the present invention, it is possible to compress a video signal having a signal amount of 100 Mbps or more to about 1,5 Mbps. 131 is a correction signal addition circuit, which is a compression circuit 1
A signal for error correction during communication is added to the compressed signal obtained from 21. Reference numeral 132 denotes a spread modulation circuit, which multiplies the signal obtained from the correction signal addition circuit 131 and the signal obtained from the PN signal generation circuit to generate a spread spectrum signal. The spread spectrum signal obtained from the spread modulation circuit 132 is frequency-converted by the frequency conversion circuit 134, amplified by the power amplification circuit 135, and transmitted.

According to the present embodiment, the compression processing is used for the captured video signal, so that the video signal is transmitted using spread spectrum communication, which has a low signal level and is less affected by interference with other devices. You can

A block diagram of the second embodiment is shown in FIG.
Compared to FIG. 1 which is a block diagram of the first embodiment, the image pickup unit 1
1 has a microphone block 117 and an amplifier circuit 118 as constituent elements. The audio signal input from the microphone block 117 is amplified by the amplifier circuit 118, and the A / D conversion circuit 1
15 is output. The output audio signal is compressed by the compression unit and transmitted by the transmission unit, similarly to the video signal.

According to the present embodiment, the video signal and the audio signal can be transmitted by using the spread spectrum communication by using the compression processing for the video signal and the audio signal.

A block diagram of the third embodiment is shown in FIG.
As compared with FIG. 1 which is a block diagram of the first embodiment, it has a control signal receiving unit 14 as a component. Therefore, the control signal receiving unit 14 receives the control signal transmitted from the outside or the receiving unit 2 including the control signal transmitting unit 23, and the image pickup unit 11 zooms, iris, focus, pans, tilts, based on the received signal. The electronic zoom and the like can be controlled, and the compression unit can control the compression rate and the like.

According to this embodiment, since the transmission unit of the image pickup apparatus having the wireless transmission function has the control signal receiver, the transmission unit can be controlled based on the control signal transmitted from the outside.

A block diagram of the fourth embodiment is shown in FIG.
A receiving unit 2 includes a receiving unit 21 and an expanding unit 22. An RF amplifier circuit 211 amplifies the received signal. Reference numeral 212 is a SAW matched filter, which converts the reception signal obtained from the RF amplification circuit 211 into an impulse-shaped correlation signal. 213 is a pulse determination circuit, which is a SAW
The signal obtained by the matched filter 212 is converted into a digital signal. An error detection / correction circuit 214 detects and corrects an error generated during communication, and also removes redundant bits. A decompression circuit 221 decompresses the signal obtained from the error detection / correction circuit 214, converts it to a digitized video signal, and outputs it.

According to the present embodiment, the compression processing is used for the captured video signal so that the communication between the video signal and the audio signal is performed by using the spread spectrum communication which has a low signal level and has less influence of interference to other devices. Can be done.

A block diagram of the fifth embodiment is shown in FIG.
As compared with FIG. 4, which is a block diagram of the fourth embodiment, the control signal transmission unit 23 is included as a component. Therefore, it is possible to transmit a control signal from the receiving unit 2 to the transmitting unit 1 and control the transmitting unit 1 using the transmitted control signal.

According to this embodiment, since the receiving unit of the image pickup apparatus having the wireless transmitting function has the control signal transmitting section, the transmitting unit can be controlled based on the control signal.

[0019]

According to the present invention, video signal communication can be performed using spread spectrum communication, which has a low signal level and has little influence on other devices, by performing compression and expansion processing of the video signal. Is. This makes it possible to separate the image pickup unit, the signal recording unit, and the image display unit, and to downsize the image pickup unit.

[Brief description of drawings]

FIG. 1 is a block diagram of a transmission unit according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a transmitting unit according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a transmitting unit according to a third embodiment of the present invention.

FIG. 4 is a block diagram of a receiving unit according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram of a receiving unit according to a fifth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transmission unit, 2 ... Reception unit, 11 ... Imaging part, 12 ... Compression part, 13 ... Transmission part, 14 ... Reception part, 21 ... Reception part, 22 ... Decompression part, 23 ... Transmission part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryushi Nishimura 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa, Ltd. Hitachi, Ltd. multimedia system development headquarters (72) Inventor Toshiro Kinugasa Yoshida, Totsuka-ku, Yokohama-shi, Kanagawa 292, Machi Co., Ltd.Hitachi, Ltd. Multimedia System Development Headquarters (72) Inventor Tamiya Imade 1410 Inada, Hitachinaka City, Ibaraki Prefecture Personal Media Equipment Division, Hitachi, Ltd. (72) Inventor Tomoyuki Kurashige Yokohama, Kanagawa Prefecture Hitachi Image Information Systems Co., Ltd. 292 Yoshida-cho, Totsuka-ku, Yokohama

Claims (8)

[Claims] 1. An image pickup apparatus having an image pickup means for picking up an image and a transmission means for transmitting a signal obtained by the image pickup means, comprising a compression means for compressing a signal output by the image pickup means, and communication. An image pickup apparatus having a wireless transmission function, characterized in that a spread spectrum method is used as means. 2. An image pickup apparatus having an image pickup means having a voice input means for photographing a video and a transmitting means for transmitting a signal obtained by the image pickup means, wherein a signal outputted by the image pickup means is compressed. An imaging apparatus having a wireless transmission function, which is provided with a compression means and uses a spread spectrum system as a communication means. 3. An image pickup apparatus having an image pickup means for picking up an image and a transmission means for transmitting a signal obtained by the image pickup means, and a compression means for compressing a signal output from the image pickup means, and a control signal. An image pickup apparatus having a wireless transmission function, characterized in that a spread spectrum system is used as a communication means. 4. An image pickup apparatus having an image pickup means having a voice input means for picking up an image and a transmission means for transmitting a signal obtained by the image pickup means, wherein a signal outputted by the image pickup means is compressed. An imaging apparatus having a wireless transmission function, which is provided with a compressing unit and a receiving unit for receiving a control signal, and uses a spread spectrum system as a communication unit. 5. A reception unit having a transmission unit having an image pickup unit for picking up an image, a transmission unit for transmitting a signal obtained by the image pickup unit, and a reception unit for receiving the signal transmitted by the transmission unit. In an imaging device having a unit, the transmission unit includes a compression unit that compresses a signal output by the imaging unit, and the reception unit includes an expansion unit that expands a signal output by the reception unit. An image pickup apparatus having a wireless transmission function, which uses a spread spectrum method. 6. A transmission unit having an image pickup means having an audio input means for photographing an image, a transmission means for transmitting a signal obtained by the image pickup means, and a signal transmitted by the transmission unit. In the image pickup apparatus having a receiving unit having a receiving unit, the transmitting unit includes a compressing unit that compresses a signal output by the image pickup unit, and the receiving unit expands the signal output by the receiving unit. An image pickup apparatus having a wireless transmission function, characterized in that a spread spectrum system is used as a communication means. 7. An image pickup means for picking up an image, a transmitting unit having a transmitting means for transmitting the signal obtained by the image pickup means, and a receiving unit having a receiving means for receiving the signal transmitted by the transmitting unit. In the image pickup apparatus having the above, the transmitting unit includes a compressing unit that compresses a signal output from the image pickup unit and a receiving unit that receives a control signal, and the receiving unit expands a signal output from the receiving unit. An image pickup apparatus having a wireless transmission function, comprising: a decompression means and a transmission means for transmitting a control signal of the transmission unit, wherein a spread spectrum method is used as a communication means. 8. An image pickup unit having a voice input unit for picking up an image, a transmission unit having a transmission unit for transmitting a signal obtained by the image pickup unit, and a signal transmitted by the transmission unit. An imaging apparatus having a receiving unit having a receiving unit, the transmitting unit including a compressing unit for compressing a signal output from the image capturing unit and a receiving unit receiving a control signal, wherein the receiving unit outputs the receiving unit. An image pickup apparatus having a wireless transmission function, which comprises a decompression means for decompressing a signal to be transmitted, a transmission means for transmitting a control signal of the transmission unit, and a spread spectrum system is used as a communication means.