Key telephone system capable of regulating volume of handset

U.S. Patent Number: 5388152

Abstract: A key telephone system has a main service unit including at least a main controller, a terminal interface and an office line interface, and a telephone terminal which is connected to the terminal interface. The telephone terminal includes a handset for transmitting and receiving a voice or a speech signal between a user and the other user, and a speech circuit for regulating a volume of the handset. The system comprises default value storage element for storing a default value which is a control value for setting a volume of each of the handset to a desired amount; change input element for inputting a new default value in order to change the default value each of the handset; default value renewal element for rewriting the default value into said new default value by selecting an input default value from the default value storage element when the default value of each of the handset is changed and input through the change input element; and renewal default value setting element for fixing the new default value as a reference value of the handset itself at completing a telephone call when the default value is changed to the new default value in each of the handset, and enabling a telephone call to a desired volume by using the new default value in a next chance of a telephone call.

Inventors: Kawauchi; Yoshihiro (Hino, JP)

Assignee: Kabushiki Kaisha Toshiba (Kawasaki, JP)

Application Number: 08/043,875

Issued: 1995-02-07

Expired: 2007-02-07

Classes: 379/157 ; 379/390.01

Field of search: 379/156,157,389,390

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