Matsushita Electric Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Toshihiro Nishimura

Shinji Fukuda

Toshiyuki Sugitani

Toshio Hayashi

Hideshi Fujiki

Junji Nakamura

Hirotaka Kawano

In a wireless communication system based on a time division multiple access method such as cordless telephone systems including a door camera, voice communication is performed in a bi-directional communication by using a paired time slots, and image communication is performed in a uni-directional communication by using both of paired time slots. One of the paired time slots may be used for transmitting a control signal such as an image data resend control signal.

Wireless communication method and wireless communication system

A visual communication is performed between a calling party and a called party through a plurality of channels. After the parties are connected through a first channel, an available telephone number of a second channel stored in a BAS control portion is read to a TNI control portion on each of the parties, and the TNI control portions of the parties exchange the available telephone numbers. Thereafter, when an incoming call having a telephone number is received through the second channel by a call control processing portion of the called party, the telephone number of the call is compared with the available telephone number of the second channel by an ICJ portion. To perform correct visual communication between parties, in cases where the telephone number of the call agrees with the available telephone number, the call is established by the call control processing portion, and image and audio signals are transmitted from the calling party to the called party through codec portions, multiplexing/demultiplexing portions and the first and second channels to perform a visual communication. In contrast, in cases where the telephone number of the call does not agree with the available telephone number, the second channel is released.

Visual communication terminal apparatus for performing multiplex

A first pictorial communication apparatus for transmitting and receiving a pictorial signal and a sound signal through a first channel and a control message through a second channel, having a line interface for communicating with ISDN, a video codec portion for coding and decoding of the pictorial signal, a key input portion and a camera, further comprises a character storing portion for storing character codes in corporation with the key input portion, a data conversion portion for converting character data train read from the character storing portion into a character video signal. On arrival of a call in an automatic answering mode, the character data train is read and transmitted through the first channel in place of a video signal from the camera after the conversion. The second apparatus has similar structure. A called second apparatus transmits the character code data train included in the control message through the second channel in the automatic answering mode on the arrival of call without the conversion. The called apparatus detects the character code data train from the control message and indicates the character code data train as an answering message after conversion by the data conversion portion.

Pictorial communication apparatus

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Fukuoka, Japan

Toshihiro Nishimura