Portable cordless telephone set for outputting various discriminiation sounds with simple circuit construction

Claim 1

A portable cordless telephone set for outputting various types of discrimination sounds in radio communication with a base unit, and having a telephone transmission and reception portion comprising: a sound generation control circuit operatively connected to said telephone transmission and reception portion to receive a discrimination sound request and having at least one microcomputer; a clock generation circuit generating an operation clock signal of said sound generation control circuit; a sound generator generating one of a plurality of discrimination sounds having sound pressures different from one another in response to one of a plurality of resonant frequencies different from one another supplied thereto, one of said resonant frequencies being near a frequency of the operation clock signal of the sound generation control circuit and output from the clock generation circuit, and other resonant frequencies being selected to satisfy the relationship of a ratio of an integer with respect to said one resonant frequency; a frequency divider circuit operatively connected to the clock generation circuit to receive the clock signal and having at least one frequency divider dividing the clock signal and providing a divider frequency signal; a switch circuit connected to the clock generation circuit and the frequency divider circuit to selectively output one frequency signal therefrom; and a timing control circuit operatively connected between the switch circuit and the sound generator, receiving the frequency signal from the switch circuit and outputting an ON/OFF timing signal of the received frequency signal to the sound generator in response to a command from the sound generation control circuit; the sound generation control circuit energizing the switch circuit and sending the command to the timing control circuit in response to the received discrimination sound request.