Loudspeaking telephone instrument

Details Loudspeaking telephone instrument Loudspeaking telephone instrument

H - Electricity

04

M

379/81

H04M 1/60 (2006.01) H04M 9/08 (2006.01)

Patent

CA 1230437

ABSTRACT LOUDSPEAKING TELEPHONE INSTRUMENT. A loudspeaking telephone instrument comprises a transmit path comprising a microphone (1) and comb filter (2); a receive path comprising a comb filter (3), a frequency shifter (4) and a loudspeaker (5); and a hybrid circuit (6). The frequency shifter (4) shifts the frequency of a signal applied to its input by a fixed amount and the comb filters (2,3) are arranged so that the frequency shifted signal falls in their stop bands. This increases the available gain in the loudspeaking telephone instrument before instability occurs. The spacings of the pass and stop bands of the comb filters (2,3) are at a multiple of the frequency by which the frequency shifter shifts that of its input signal. Figure 1.

476557

Affiliated with

Also associated with

Rating

Loudspeaking telephone instrument does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Loudspeaking telephone instrument, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Loudspeaking telephone instrument will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1260833