JPH09331467A - AV signal wireless transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect AV equipment in a prescribed form by judging the ID of various AV equipment or the state of a system connected by AV signal radio transmitter and receiver. SOLUTION: When preventing the illegal copy of AV signals to an external storage device, etc., for example, download information or IC card information from a center is stored at a communication terminal 1a of AV equipment on the side of transmission and corresponding to this information, a protect signal for preventing the illegal AV signal copy is transmitted from the terminal 1a to an AV signal radio transmitter 10a. As a result, the AV signal is outputted from an AV signal radio receiver 20a connected to a TV 2a having no signal recording function but no AV signal is outputted from a receiver 20b connected to a VTR 2b having the signal recording function and the illegal copy can be prevented. Thus, since the selection information of the desired connection form is integrated beforehand, base on the information concerning the ID From various AV equipment to be connected or the state of the system, the AV equipment can be connected in the prescribed form.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AV signal wireless transmission device used in connection between AV devices.

[0002]

2. Description of the Related Art A conventional AV signal wireless transmission device of this type is known from Japanese Patent Application Laid-Open No. 5-22191. FIG. 6 shows the configuration of this conventional device.
The signal input / output interface unit 31, the AV signal input / output switching unit 32, the wireless transmitting / receiving unit 33, and the wireless frequency switching unit 34 are included.

[0003]

However, the above-mentioned conventional AV signal wireless transmission device is limited in that installation of AV devices and distribution of AV signals are facilitated by performing connection between devices by AV cables by wireless transmission. It is a transmission device used for the above-mentioned purpose, and has a problem that it cannot transmit / receive by judging the ID of the connected AV equipment and the state of the system.

The present invention solves the above-mentioned conventional problems, and determines the IDs and system states of various AV devices connected by an AV signal wireless transmitter and a receiver, and determines a predetermined distance between these AV devices. It is an object of the present invention to provide an AV signal wireless transmission device that can be connected in the form of.

[0005]

In order to solve the above problems, the present invention provides an AV signal transmitted between AV devices connected by an AV signal wireless transmitter and a receiver, as well as an AV signal transmitted from the connected AV device. This information is transmitted as a control signal.

According to the present invention, it is possible to obtain an AV signal wireless transmission device capable of connecting AV devices in a desired form based on information from various connected AV devices.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a functional block diagram showing the configurations of an AV signal wireless transmitter and an AV signal wireless receiver constituting an AV signal wireless transmission device of the present invention.
1A shows an AV signal wireless transmitter, and FIG. 1B shows an AV signal wireless receiver. In FIG. 1A, reference numeral 10 denotes an AV signal wireless transmitter, which transmits a video signal S _V , an audio signal S _A and a control signal S _C input from the transmitting AV device 1 to a video signal processing unit 11 and an audio signal processing, respectively. A signal multiplexer 14 that multiplexes via the unit 12 and the control signal processor 13, a modulator 15 that modulates the multiplexed signal to a radio frequency set by the information of the control signal processor 13, and the modulated signal is transmitted. Wireless transmitter for
It consists of 16 and antenna 17.

On the other hand, the AV signal radio receiver 20 shown in FIG.
Is an antenna 27 for receiving a radio signal transmitted from the AV signal radio transmitter 10 and a radio reception unit 26, and a demodulation unit 25 for demodulating a modulated wave at a radio frequency set by the information of the control signal processing unit 23. A signal separation unit 24 for separating the demodulated multiplexed signal, and a control signal processing unit 23 for comparing the control signal separated by the signal separation unit 24 with the control signal input from the receiving AV device 2. The video signal processing unit 21 and the audio signal processing unit 22 are controlled by the information of the control signal processing unit 23.

As described above, since the AV signal such as the video signal S _V and the audio signal S _A as well as the control signal S _C are transmitted between the AV devices respectively connected to the AV signal wireless transmitter and the receiver, each of them is transmitted. Information for selecting a desired connection form systematically incorporated in the AV device is transmitted as this control signal S _{C, and} is separated by the signal separation unit 24.
The desired connection configuration is confirmed by comparing the control signal S _C from the control signal S _C with the predetermined control signal input from the receiving AV device 2, and by executing this, the connection A is established.
V equipment selection, connection restriction, AV signal transmission, etc.
Based on information from various connected AV devices, these AV devices can be connected in a predetermined form.

As described above, according to the present embodiment, the AV
Since a control signal is transmitted in addition to the AV signal between the AV equipments respectively connected to the signal wireless transmitter and the receiver, information for selecting a desired connection form as this control signal is systematically provided to each AV equipment. If incorporated, these AV devices can be connected in a predetermined form based on IDs from various connected AV devices and information on the system state.

[0011]

EXAMPLES Next, specific examples of the present invention will be described. It should be noted that the same reference numerals are used for the parts common to the above-described embodiment and the following examples, and the overlapping description will be omitted.

(Embodiment 1) FIG. 2 shows a specific example in the case of preventing illegal copying of an AV signal to an external storage device or the like.
In the figure, download information or IC card information from the center is accumulated in the communication terminal 1a, which is the AV device on the transmission side, and the communication terminal 1a outputs the AV information based on this information.
A protect signal for preventing illegal copying of the AV signal is transmitted to the signal wireless transmitter 10a as the control signal, and as a result,
An AV signal is output from the AV signal wireless receiver 20a connected to the TV (display) 2a having no signal recording function, but A connected to the VTR 2b having a signal recording function.
The V signal wireless receiver 20b operates so that the AV signal is not output.

Thus, it is possible to prevent illegal copying of an AV signal which needs to be protected against copying to an external storage device or the like.

(Embodiment 2) FIG. 3 shows a specific example in the case of distributing an AV signal to a plurality of specific AV devices connected to an AV signal wireless receiver. In the figure, the communication terminal 1b stores download information from the center or IC card information. The AV signal distribution permission signal is transmitted as the control signal from the communication terminal 1b to the AV signal wireless transmitter 10b based on these pieces of information, whereby the TV 2c, T
All AV signal radio receiver 20 connected to V2d and VTR2e
AV signals are output from c, 20d, and 20e.

As described above, the AV signals from the transmitting side AV equipment are connected to the AV signal wireless receiver, and a plurality of specific receiving side A's are connected.
V equipment can be distributed.

(Embodiment 3) FIG. 4 shows a specific example of the case where the AV signal radio transmitter functions as a guard key. In this case, the AV equipment 1d and 2f to be connected are connected by the AV signal radio transmitter 10c and the AV signal radio receiver 20f, and the AV equipment 1c which should not be connected is not connected to the AV signal radio transmitter. Then, the AV signal wireless transmitter is configured to function as a guard key.

As described above, the AV signal wireless transmitter is set to the transmitting side A.
If it is not connected to the V device, the AV signal cannot be output from the AV wireless receiver.
The signal radio transmitter may serve as a guard key.

Incidentally, FIG. 5 shows a connection form between the AV equipment and the AV signal transmitter or receiver in the AV signal wireless transmission apparatus, and is shown in FIGS. 5 (a), (b) and (c). In, the video signal terminal 6, the audio signal L terminal 7, the audio signal R terminal 8 and the control signal / DC provided in the AV device 3
A terminal corresponding to the power supply terminal 9 and fitted and connected to the power supply terminal 9 is provided on the side of the AV signal transmitter or the receiver so as to directly connect the both without using an AV cable. This greatly simplifies the wiring connection on the back of the AV device and connects the AV signal transmitter or receiver as compared with the case where each signal terminal of each AV device is connected by an AV cable. It is easy to see if there is any, and it is easy to check the wiring connection of each terminal.

[0019]

As described above, according to the present invention, in addition to an AV signal transmitted between AV devices connected by an AV signal wireless transmitter and a receiver, information from the transmitting AV device is used as a control signal. It was designed to be transmitted,
An advantageous effect is obtained in which the ID of each AV device and the system state can be determined based on information from various connected AV devices and the AV devices can be connected in a predetermined form.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing a configuration in an embodiment of an AV signal wireless transmission device of the present invention.

FIG. 2 is a block diagram for explaining an operation in the first embodiment of the AV signal wireless transmission device of the present invention.

FIG. 3 is a block diagram for explaining an operation in the second embodiment of the AV signal wireless transmission device of the present invention.

FIG. 4 is a block diagram for explaining an operation in the third embodiment of the AV signal wireless transmission device of the present invention.

FIG. 5 is a schematic explanatory diagram showing each example of a connection form between an AV device and an AV signal transmitter or a receiver in each example of the AV signal wireless transmission device of the present invention.

FIG. 6 is a functional block diagram showing an outline of a conventional AV signal wireless transmission device.

[Explanation of symbols]

1, 1c, 1d, 2, 3 ... AV equipment, 1a, 1b ... Communication terminal, 2a, 2c, 2d, 2f ... TV (display), 2
b, 2e ... VTR, 4 ... AV signal transmitter or receiver,
5 ... Antenna, 6 ... Video signal terminal, 7 ... Audio signal L terminal, 8 ... Audio signal R terminal, 9 ... Control signal / DC
Power supply terminal, 10, 10a, 10b, 10c ... AV signal wireless transmitter, 11, 21 ... Video signal processing section, 12, 22 ... Audio signal processing section, 13, 23 ... Control signal processing section, 14 ... Signal multiplexing section,
15 ... Modulator, 16 ... Wireless transmitter, 17, 27 ... Antenna,
20, 20a, 20b, 20c, 20d, 20e, 20f ... AV signal wireless receiver, 24 ... Signal separating unit, 25 ... Demodulating unit, 26 ... Wireless receiving unit.

Claims (6)

[Claims] 1. A signal multiplexing unit for multiplexing a video signal, an audio signal and a control signal input from a transmitting AV device via a video signal processing unit, an audio signal processing unit and a control signal processing unit respectively, and the control signal. An AV signal wireless transmitter, comprising: a modulator for modulating the multiplexed signal to a radio frequency set by information of a processor, and a wireless transmitter for transmitting the modulated signal. 2. A radio receiving unit for receiving a radio signal sent from the AV signal radio transmitter, a demodulation unit for demodulating the received radio signal, and a demultiplexing unit for separating the demodulated multiplexed signal. A signal separating unit, a control signal from the AV device on the transmitting side separated by the signal separating unit, and an AV on the receiving side.
A control signal processing unit for comparing a control signal input from a device, a video signal processing unit controlled by information of the control signal processing unit, an audio signal processing unit, the demodulation unit of the control signal processing unit. An AV signal radio receiver, characterized in that the radio signal is demodulated at a radio frequency set by information. 3. A signal multiplexing unit for multiplexing a video signal, an audio signal and a control signal input from a transmitting AV device via a video signal processing unit, an audio signal processing unit and a control signal processing unit respectively, and the control signal. An AV signal wireless transmitter including a modulation unit that modulates the multiplexed signal to a radio frequency set by information of a processing unit, and a wireless transmission unit that transmits the modulated signal, and the AV signal wireless transmitter A radio receiving unit for receiving the radio signal transmitted from the demodulator, a demodulating unit for demodulating the received radio signal, a signal separating unit for separating the demodulated multiplex signal, and a separating unit for separating the signal. Control signal processing unit for comparing the control signal from the AV device on the transmitting side and the control signal input from the AV device on the receiving side, and a video signal processing unit controlled by the information of the control signal processing unit An AV signal radio, comprising an audio signal processing unit, wherein the demodulation unit comprises an AV signal radio receiver for demodulating the radio signal at a radio frequency set by information of the control signal processing unit. Transmission equipment. 4. The control signal input from the transmitting AV device to the AV signal wireless transmitter is a protect signal externally set in the AV device, and an external storage device for the AV signal output from the AV device, etc. 4. The AV signal wireless transmission device according to claim 3, which prevents unauthorized copying to the AV signal. 5. The control signal input from the transmitting AV device to the AV signal wireless transmitter is an AV signal distribution permission signal externally set in the AV device, and the AV signal output from the AV device is an AV signal. 4. The AV signal wireless transmission device according to claim 3, wherein the AV signal wireless transmission device is distributed to a plurality of specific AV devices on the receiving side connected to the signal wireless receiver. 6. The AV signal wireless transmitter and the AV signal wireless receiver each input / output terminal is directly connected to each input / output terminal of each AV device without passing through an AV cable. AV signal wireless transmission device.