Transmitter-receiver station having low power consumption for a two-way communication link
First Claim
1. A transmitter-receiver station for a two-way communication link, comprising a transmitter-receiver unit, means for supplying current to said transmitter-receiver unit, a telephone handset to be lifted from a cradle in order to be put into service, a telephone set which is provided with a ringer and delivers a "lifted-handset" signal when said handset is removed from its cradle, a power-saving device comprising a frequency generator for producing pulses and a coupling circuit which has the function during a standby-watch state of the station of controlling the operation of the current supply means in dependence on the duration of the pulses and of permitting continuous operation of said current supply means throughout the duration of the lifted-handset signal, said coupling circuit being provided with a delay circuit for receiving the lifted-handset signal, for preventing operation of the ringer and for preventing continuous operation of the current supply means during a predetermined time interval after disappearance of said lifted-handset signal.
1 Assignment
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Accused Products
Abstract
A transmitter-receiver station for two-way communication links comprises a power-saving device and a ringer which is responsive to incoming calls. When the handset of the station considered is replaced in its cradle after a connection with another station, the power-saving device of the station considered comes into operation, with the immediate result that the transmitter-receiver unit is subsequently supplied only in an intermittent manner and that, by means of a delay circuit, the ringer of the telephone set can be actuated only after a predetermined time interval. The effect thereby achieved in the station considered is that operation of the ringer is prevented from taking place as soon as the handset has been replaced if the handset in the other station remains lifted for a slightly longer period of time.
35 Citations
3 Claims
- 1. A transmitter-receiver station for a two-way communication link, comprising a transmitter-receiver unit, means for supplying current to said transmitter-receiver unit, a telephone handset to be lifted from a cradle in order to be put into service, a telephone set which is provided with a ringer and delivers a "lifted-handset" signal when said handset is removed from its cradle, a power-saving device comprising a frequency generator for producing pulses and a coupling circuit which has the function during a standby-watch state of the station of controlling the operation of the current supply means in dependence on the duration of the pulses and of permitting continuous operation of said current supply means throughout the duration of the lifted-handset signal, said coupling circuit being provided with a delay circuit for receiving the lifted-handset signal, for preventing operation of the ringer and for preventing continuous operation of the current supply means during a predetermined time interval after disappearance of said lifted-handset signal.
Specification