H - Electricity – 04 – M
Patent
H - Electricity
04
M
H04M 1/60 (2006.01) H04M 1/02 (2006.01) H04M 1/20 (2006.01) H04R 3/00 (2006.01)
Patent
CA 2241708
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.
La présente invention est un téléphone à haut-parleur dans lequel la composante due au couplage acoustique entre le haut-parleur et le microphone vocal a été éliminée du signal de sortie. Le téléphone à haut-parleur de la présente invention comprend un microphone d'élimination du bruit 25 monté près du microphone vocal 6, un amplificateur à filtre passe-bande 26 servant à extraire une composante fréquentielle du signal de sortie du microphone d'élimination du bruit 25 et un amplificateur différentiel 27 servant à ajouter au signal de sortie du microphone vocal 6, en opposition de phase avec ce signal, un signal extrait par l'amplificateur à filtre passe-bande 26, cette addition étant effectuée de façon à annuler la composante due au couplage acoustique entre le haut-parleur 4 et le microphone vocal 6.
Oku Hidenori
Takahashi Toshiaki
Fetherstonhaugh & Co.
Kabushiki Kaisha Toshiba
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