Uniden Corporation

Hiroyuki Ishida

Hideo Hikuma

Takahiro Kudo

Masayasu Fujino

Katsuhiko Otsuji

Yuzo Ishida

Kunihiro Takahashi

Min Zhao

Yoshihisa Takebe

Yuichi Bannai

Fumiya Hirayama

Hideo Hikiuma

A cordless telephone set having a base unit and handset units and enabling communications using a channel selected from a plurality of channels. The cordless telephone set comprises apparatus for storing a specified number of channels selected by the telephone apparatus and storing historical channel use data. Whether or not a channel is unused is determined and channels used with high frequency with the data stored in the first storage are changed to those used with low frequency according to the historical use data. Channels that are stored are progressively specified prior to a start of call and a specified channel is selected, if it is determined that the channel is an unused one.

Adaptive channel selection method for a cordless telephone

A cordless telephone set having various functions, such as transplantation, secrecy, repeated display and compressed display function is disclosed. A control circuit of a main unit and a control circuit of a subunit of the cordless telephone set are preprogrammed to realize a transplantation function for transplanting functions of the digital telephone set to the cordless telephone set, a secrecy function for preventing the digital telephone set from eavesdropping on communication conducted through the cordless telephone set, a repeated display function for repeatedly displaying a display message received from digital switching equipment when the subunit Y issues no answer to a call, and a compressed display function for displaying, in a compressed manner, a display message received from the digital switching equipment.

Cordless telephone set

Communication method, communication apparatus, and cordless telephone

A cordless telephone consisting of base and handset units is disclosed wherein a control circuit incorporated in the base unit comprises first and second D/A converters, first and second A/D converters, and first and second sync. signal generation circuits. The first and second D/A converters respectively convert digital signals from the handset unit and a PBX. The first and second A/D converters convert the analog signals provided from the first and second D/A converters to transmit them to the PBX and handset unit, respectively. The first sync. signal generation circuit regenerates a first clock signal synchronously with a sync. signal provided from the PBX to render the first A/D and second D/A converters to operate in synchronism with the sync. signal from the PBX. The second sync. signal generation circuit generates a second clock signal which is independent of the sync. signal from the PBX to render the first D/A and second A/D converters to operate in synchronism with the second clock signal. Accordingly, the synchronization between the base and handset units is effected independently of the synchronization signal from the PBX.

Cordless telephone

Plurality of radio channels include a first radio channel group having channel(s) permitted to be used only when the radio channels are not being used by other device, a second radio channel group available for communication regardless of whether the radio channels are being used by other device, a base unit and/or a handset unit therein comprises a first memory unit for storing radio channels in first and second radio channel groups, a determining unit for determining whether a specified radio channel is busy, a control unit for specifying a radio channel in the first radio channel group prior to start of call and determining whether the radio channel is busy, selecting the radio channel if not busy, and otherwise one radio channel from the second radio channel group.

Channel selecting cordless telephone

Growing community of inventors

Chiba-ken, Japan

Hiroyuki Ishida