Voice-switching device and method for multiple receivers
AssigneeNortel Networks Limited
InventorsPaul Provencal, Christopher M Forrester
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Abstract
A voice-switching device for use in a telephone terminal which applies an optimal amount of switched loss to a plurality of distinct receive transducers. The voice-switching device detects speech signals on the transmit and receive paths to determine a mode of operation. Based on the mode of operation the device applies optimal amount of loss to the transmit path and each output path separately. This system eliminates excessive attenuation of non-dominant receive transducers as well as optimizes the transition time from active to quiescent mode for all receive transducers.
Claims11
A method for varying the inserted switched loss of a terminal having a transmit path, a receive path, and a plurality of output paths, said method comprising the steps of:
- sampling the transmit and receive paths to determine the presence and magnitude of speech signals;
- determining the mode of operation of said terminal responsive to said sampling;
- and
- adjusting the value of the switched loss applied to the transmit path and each output path separately responsive to determining the mode of operation;
- wherein said mode of operation includes:
- a transmit mode;
- a receive mode;
- and
- a quiescent mode;
- and
- wherein the step of determining the mode of operation includes:
- identifying transmit mode when speech signals present on the transmit path are greater than those present on the receive path;
- and
- identify receive mode when speech signals present on the receive path are greater than those present on the transmit path;
- and
- identifying quiescent mode when no speech signals are present on either the receive or transmit paths;
- and
- wherein the step of adjusting the value of the switched loss includes determining the amount of loss necessary to compensate for the output path which provides the greatest amount of coupling with the transmit path.
A telephone voice-switching device to improve audio quality in a telephone terminal, wherein said device comprises:
- a transmit path;
- a receive path;
- a plurality of output paths for connecting receiver transducers to the receive path;
- means for sampling the transmit and receive paths in order to identify the presence of speech signals;
- means for determining the mode of operation responsive to sampling the transmit and receive paths;
- and
- means for adjusting the value of the switched loss applied to the transmit path and each output path separately responsive to determining the mode of operation and responsive to determining the amount of loss necessary to compensate for the output path which provides the greatest amount of coupling with the transmit path.
A telephone voice-switching device to improve audio quality in a telephone terminal comprising:
- a transmit path;
- a receive path;
- a plurality of output paths;
- a speech detector connected to the transmit path;
- a speech detector connected to the receive path;
- a variolosser connected to the transmit path;
- a separate variolosser connected to each receive output path;
- and
- a controller for controlling said variolossers responsive to detected speech signals by determining the amount of loss necessary to compensate for the output path which provides the greatest amount of coupling with the transmit path.
Dependencies are inferred from the claim text.