Abstract: A hands-free telephone terminal includes a loudspeaker (HP), a microphone (MI) and loudspeaker gain control means (AUG, DIM, PP). A loudspeaker gain correction method cyclically determines a listening comfort index to deduce gain modification parameters. If the local user modifies the loudspeaker gain using the control means, the gain modification parameters weight the loudspeaker gain to optimize listening comfort during a telephone conversation for the local user and for the remote user.
Type:
Grant
Filed:
August 27, 1997
Date of Patent:
October 19, 1999
Assignee:
Prescom
Inventors:
Yves Le Damany, Frederic Zurcher, Marc Niberon
Abstract: The invention concerns a switching device for a telephone set having a handset enabling an auxiliary device to be substituted for the handset. In an embodiment, the switching device includes a casing provided with at least one compartment, the compartment being intended to receive one end of the handset. The compartment includes a switch actuated by the presence of the handset which triggers the aforementioned substitution. The invention finds application in hands-free telephoning and teleconferencing.
Abstract: Several microphones (M1, M3) are arranged substantially in the same plane (P) and are distributed symmetrically with respect to a direction of symmetry (D) perpendicular to this plane (P). A phase shift is applied between the signals output respectively by different microphones (M1, M3) and the signals thus phase shifted are added, in such a way as substantially to cancel the signals relating to any sound wave arriving in phase and with the same intensity on each of the microphones (M1, M3).
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