Ringing circuit for use in portable telephone set

Details Ringing circuit for use in portable telephone set Ringing circuit for use in portable telephone set

H - Electricity

04

M

H04M 1/00 (2006.01) H04M 19/04 (2006.01) H04M 1/60 (2006.01)

Patent

CA 2035411

A portable telephone set having a ringing circuit for producing different ringing tones depending upon the use mode of the portable telephone set, a portable mode or a mobile mode. The ringing circuit comprises a mode detecting circuit fox detecting the use mode, an internal loudspeaker housed in a housing of the portable telephone set fox producing 2 first ringing signal when the portable telephone set is in the portable mode, an external loud- speaker connected externally of the housing fox producing a second ringing signal when it is in the mobile mode and a ringing tone generator for generating a first and a second ringing tones for driving the respective loud- speakers producing first and second ringings. The first and second ringing tones have frequency spectra compatible with frequency characteristics of these loudspeakers to produce the respective ringings efficiently. The ringing signal generator may be a single ringing tone generating circuit producing two kinds of ringing tone or may be comprised of two different ringing tone generating circuits.

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