JPH0514550A - Cordless video telephone system - Google Patents

Abstract

PURPOSE:To use the television telephone set anywhere in any state. CONSTITUTION:The cordless telephone set has a function in which the transmission and reception of an audio signal and a picture signal between a master set, a handset and a picture input output means 4 are implemented with a radio wave. The transmission/reception is implemented by using the handset while observing a picture displayed on a picture display means 3 of the picture input output means 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless video telephone, and more particularly to a cordless video telephone for wirelessly transmitting an image signal of the video telephone to an image display means and receiving it from an image pickup means. ..

[0002]

2. Description of the Related Art Conventionally, a cordless video telephone comprises a base unit and a handset connected to a public telephone line as seen in Japanese Patent Laid-Open No. 1-168154, and radio waves are transmitted and received between them. Therefore, the master unit has a function of transmitting and receiving radio waves, and the handset also has a built-in radio wave transmitter and receiver. That is, the image and sound of the other party are converted from the electric signal to the radio signal by the parent device and sent to the handset. On the contrary, the image signal and the voice signal by the radio wave from the handset are converted from the radio wave signal into the electric signal by the device and sent to the other party. Therefore, cordless video phones are not tied to cords,
You can talk to the other party and see the image from the other party anywhere in the room.

[0003]

However, in the cordless video telephone as described above, although the image of the video telephone can be displayed on the monitor on the handset side, the image displayed on the monitor built in the handset can be seen. It was difficult to see the image while talking with the other party.

The present invention has been made to solve the above-mentioned problems, and an image of a cordless television telephone is wirelessly transmitted to a general television, and the image is displayed on the television. It is an object of the present invention to provide a cordless video phone that further improves the convenience of the cordless video phone.

[0005]

In order to achieve this object, the present invention is a videophone for transmitting and receiving an image signal and an audio signal by a telephone line, wherein the image signal and the audio signal are received from the telephone line. A master unit having an image / sound transmitting circuit for transmitting a radio wave to a handset, an image transmitting / receiving circuit for image input / output means, and an image / sound receiving circuit for receiving a radio wave from the voice transmitting circuit of the handset; An image receiving circuit that receives an electric wave from a voice transmitting circuit and separates an image signal, an image output circuit that outputs an image signal that is an output signal of the image receiving circuit, and an image output by the image output circuit is displayed. And an image input circuit for inputting an image from an external camera,
An audio input / output unit that includes an image transmission circuit that transmits the input signal of the image to the master unit by radio waves, and a voice reception that receives the radio waves from the image / voice transmission circuit of the master unit and separates the audio signals. The handset includes a circuit and a voice transmitting circuit that transmits an input signal of voice input from a microphone to the master unit by radio waves.

[0006]

The video / audio transmitting circuit of the cordless video telephone of the present invention having the above-mentioned configuration wirelessly transmits the video signal and the audio signal received from the telephone line by the video telephone to the handset. The image / audio receiving circuit receives the radio waves transmitted by the image transmitting circuit of the image input / output means and the voice transmitting circuit of the handset, which will be described later.

The image receiving circuit receives the radio wave from the image / audio transmitting circuit of the base unit and separates the image signal. The image output circuit outputs an image signal which is an output signal of the image receiving circuit. The image display means displays the image output by the image output circuit. The image input circuit inputs an image from an external camera. The image transmission circuit transmits the input image signal to the parent device by radio waves.
The image input / output unit includes the image receiving circuit, the image output circuit, the image display unit, and the image transmitting circuit.

The voice receiving circuit of the handset receives the radio wave from the image and voice transmitting circuit of the base unit and separates the voice signal. The voice transmitting circuit transmits a voice signal input from the microphone to the base unit by radio waves.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

First, referring to the external views of FIGS. 1 to 3 and the block diagrams of FIGS. 4 to 6, the configuration of the entire cordless video telephone will be described.

First, the configuration of the telephone monitor 4 will be described with reference to FIGS. The telephone monitor 4 includes an antenna 1 for transmitting and receiving radio waves to and from the base unit 20, and an image receiving circuit 3 for converting the radio signal into an electric signal and separating the image signal.
0, an image output circuit 32 that inputs the image signal and drives the monitor 3, a monitor 3 (image display unit) that displays an image, a camera 2 that captures an image, and a signal from the camera. An image input circuit 33 that outputs an image signal and an image transmission circuit 31 that inputs the image signal and converts the image signal into a radio signal.

The configuration of the handset 10 will be described with reference to FIGS. 2 and 5. The handset 10 is the base unit 2
An antenna 11 for transmitting and receiving radio waves to and from 0, a voice receiving circuit 44 for converting the radio signal into an electric signal and separating the voice signal, a voice output circuit 46 for inputting the voice signal and driving the speaker 12, A speaker 12 (voice output means) for outputting voice and a microphone 13 for inputting voice
And a voice input circuit 47 for inputting the signal from the microphone 13 and converting it into a voice signal for output, and a voice transmitting circuit 45 for receiving the voice signal and converting it into a radio signal.

Further, the configuration of the base unit 20 of the cordless video telephone will be described with reference to FIGS. 3 and 6.

In the figure, a master unit 20 is connected to a telephone line 21, separates a voice signal and an image signal from a signal received from the telephone line 21, and outputs a voice signal and an image signal. An input interface 52 for inputting an image signal from the camera 27 and an audio signal from the microphone 25 and outputting the audio signal and the image signal to the system control circuit 51, receiving radio waves from the telephone monitor 4 and the handset 10, A voice from the telephone circuit 50 and an image / sound receiving circuit 56 that converts a radio wave signal into an electrical signal, separates the electrical signal into a sound signal and an image signal, and outputs the sound signal and the image signal to the system control circuit 51. A signal and an image signal, an audio signal and an image signal from the input interface 52, and an audio signal and an image signal from the image and audio receiving circuit 56. From the system control circuit 51, the system control circuit 51 that switches the output signal according to the usage status of the line, the line button 22 that inputs the usage status of the line, and selectively controls the system control circuit. An image driver 53 which inputs an image signal and outputs it to the monitor 26, and an audio driver 54 which outputs an audio signal from the system control circuit 51 to the speaker 24.
And an image / sound transmission circuit 55 for synthesizing the image signal and the sound signal from the system control circuit 51 and converting them into a radio wave signal and sending out from the antenna 23, a camera 27 for shooting an image, and a monitor for displaying the image. 26, a microphone 25 for inputting voice, and a speaker 24 for outputting voice.

Next, the operation of the cordless videophone of this embodiment will be described with reference to FIGS.

In the base unit 20 of the cordless videophone shown in FIGS. 3 and 6, the telephone circuit 50 receives the telephone signal sent from the telephone line 21 as in the case of an ordinary telephone.
Separated into image and audio signals. The image signal and the audio signal are input to the system control circuit 51.

The image taken by the camera 27 and the sound collected by the microphone 25 are converted into an image signal and a sound signal by the input interface 52 and input to the system control circuit 51. Further, the image signal is received from the handset 10 and the radio signal from the telephone monitor 4, the radio signal is converted into an electric signal, and the electric signal is separated from the electric signal into an image signal and an audio signal. And a voice signal are input to the system control circuit 51.

The image signal and the audio signal from the telephone circuit 50, the input interface 52 and the image / sound receiving circuit 56, which are input to the system control circuit 51, are output by the line switch 22 according to the use condition of the line. The system control circuit 51 is selectively switched to output an image signal to the image driver 53 and an audio signal to the audio driver 54. At the same time, the image signal and the audio signal are transmitted to the image / audio transmitting circuit 55 and the telephone circuit 5.
Send to 0.

That is, the lines are the telephone line 21 and the base unit 20.
When only connected to the system control circuit 51
Outputs the image signal and the audio signal from the input interface 52 to the telephone circuit 50, the image driver 53 and the audio driver 54, and when the line is connected to the telephone line 21 and the handset 10, The system control circuit 51 outputs the image signal and the audio signal received by the image / audio receiving circuit 56 from the handset 10 to the telephone circuit 50, the image driver 53 and the audio driver 54, and the line is in the extension state. When the master device 20 and the handset 10 are connected, the system control circuit 51 causes the image driver 53 and the audio driver 54 to operate.
From the handset 10 to the image / audio receiving circuit 56.
The telephone circuit 50 outputs the image signal and the audio signal received by the
Does not output anything.

The image signal is sent to the image driver 53.
Displays an image on the monitor 26 for image display. For example, the image signal is converted into a composite video signal which is a general video signal and output to the monitor 26.
The audio driver 54 outputs an audio signal to the speaker 24. On the other hand, the image / audio transmitting circuit 55 synthesizes the image signal and the audio signal, converts them into a radio signal, and sends out from the antenna 23. Further, the image signal and the audio signal sent to the telephone circuit 50 are converted into a telephone signal and sent to the telephone line 21.

In the telephone monitor 4 of FIGS. 1 and 4, the radio wave signal transmitted from the antenna 23 of the base unit 20 is
It is received by the antenna 1 on the telephone monitor 4 side and converted into an electric signal by the image receiving circuit 30 of the telephone monitor 4.
Further, the image receiving circuit 30 separates the image signal from the electric signal and outputs it to the image output circuit 32. The image output circuit 32 outputs the image signal to the monitor 3. An image from the outside is transmitted by the camera 2 connected to the image input circuit 33 of the telephone monitor 4. That is, the image captured by the external camera 2 becomes an image signal and is sent to the image input circuit 33. The image input circuit 33 outputs the image signal to the image transmission circuit 31. The image transmission circuit 31 converts the image signal into a radio signal and transmits it from the antenna 1.

In the handset 10 of FIGS. 2 and 5,
The radio signal transmitted from the antenna 23 of the base unit 20 is received by the antenna 11 on the handset 10 side and converted into an electric signal by the voice receiving circuit 44 of the handset 10. Further, the voice receiving circuit 44 separates a voice signal from the electric signal and outputs it to the voice output circuit 46.
The audio output circuit 46 outputs an audio signal to the speaker 12. Also, as with a general telephone, the voice captured by the microphone 13 is converted into a voice signal by the voice input circuit 4.
Input to 7. The voice input circuit 47 outputs a voice signal to the voice transmitting circuit 45. The voice transmission circuit 4
The antenna 5 converts the voice signal into a radio wave signal,
Send from 1.

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the invention.

Signal transmission / reception between the base unit 20, the handset 10 and the telephone monitor 4 is not limited to radio waves, and light or the like may be used.

Further, a home-use television may be used as a substitute for the monitor 3 portion of the telephone monitor 4, and in that case, the telephone monitor 4 is connected to the transmission / reception circuit of the image signal with the base unit 20 and the home-use television. Although it will be configured to have the function of an output circuit,
The configuration is such that the monitor portion of the telephone monitor of the present invention is replaced with a home-use monitor.

[0026]

As is apparent from the above description, since the cordless video telephone of the present invention is composed of the base unit, the voice transmitter / receiver of the handset and the telephone monitor, the caller can monitor at the most suitable place. And you can install a camera, which is even more convenient.

[Brief description of drawings]

FIG. 1 is an external view of a telephone monitor of a cordless videophone according to the present invention.

FIG. 2 is an external view of a handset of the cordless videophone of the present invention.

FIG. 3 is an external view of a base unit of the cordless videophone of the present invention.

FIG. 4 is a block diagram showing a configuration of a telephone monitor of the cordless video telephone according to the present invention.

FIG. 5 is a block diagram showing a configuration of a handset of the cordless videophone of the present invention.

FIG. 6 is a block diagram showing a configuration of a base unit of the cordless videophone of the present invention.

[Explanation of symbols]

 2 camera 3 monitor (image display means) 4 telephone monitor (image input / output means) 10 handset 12 speaker (voice output means) 13 microphone 20 base unit 21 telephone line 30 image receiving circuit 31 image transmitting circuit 32 image output circuit 33 image input Circuit 44 Audio receiving circuit 45 Audio transmitting circuit 55 Image audio transmitting circuit 56 Image audio receiving circuit

Claims (1)

Claim: What is claimed is: 1. A videophone for transmitting and receiving an image signal and an audio signal via a telephone line, wherein the image signal and the audio signal received from the telephone line are transmitted to a handset by radio waves. A master unit having a circuit, an image transmitting circuit of the image input / output unit, and an image voice receiving circuit that receives radio waves from the voice transmitting circuit of the handset; and an electric wave received from the image voice transmitting circuit of the master unit. An image receiving circuit that separates signals, an image output circuit that outputs an image signal that is an output signal of the image receiving circuit, an image display unit that displays the image output by the image output circuit, and an image from an external camera An image input / output means for inputting the image input circuit and an image transmission circuit for transmitting the input signal of the image to the master unit by radio waves; Built-in audio reception circuit that receives radio waves from the image / audio transmission circuit of the base unit and separates audio signals, and voice transmission circuit that transmits the input signal of the voice input from the microphone to the base unit by radio waves. A cordless videophone consisting of a handset.