Abstract: A speakerphone of the present invention can obtain an output in which an acoustic coupling component between a louder speaker and a speech microphone has been removed. The loudspeaker telephone set of the present invention comprises a noise canceling microphone 25 which is located near the speech microphone 6, a band-pass filter amplifier 26 for extracting only a partial frequency component of a signal from the noise canceling microphone 25 and a differential amplifier 27 for adding a signal extracted by the band-pass filter amplifier 26 in opposite phase to a signal from the speech microphone 6 so that an acoustic coupling component between the louder speaker 4 and the speech microphone 6 is canceled by the result of the above addition.

Abstract: A tape carrier package is used as a controller for controlling a liquid crystal display panel, and the tape carrier package are connected to each other with use of a heat seal. The liquid crystal display panel is stack to one face of a liquid crystal display panel substrate via spacer, on the other hand, the tape carrier package is stack to the other face thereof, and then, the liquid crystal display panel substrate is attached to a main circuit board by means of a retaining member, thereby the liquid crystal display panel being attached to a display window of a telephone housing. Therefore, a structure around the liquid crystal display panel is simplified, so that the number of components can be reduced, and also an assembling work can be readily performed.

Abstract: A transmitter for communication equipment, including a casing with a speaker piece. The speaker piece is provided with a plurality of outer microphone through holes. An air chamber housing is arranged on an inner surface of the speaker piece and includes an air chamber communicating to the outer microphone holes. The air chamber housing has an inner microphone hole formed through it to open at an upper surface thereof. A microphone holder is integrally formed with the upper surface of the air chamber housing to communicate to the inner microphone hole. The microphone holder is adapted to receive a condenser microphone. A jack is integrally erected on the upper surface of the air chamber housing.