Wireless multi-unit conference phone
First Claim
Patent Images
1. A conference phone system comprising:
- a. a base station having a telephone line interface, a POD interface and a base control processor coupled to the telephone line interface and the POD interface operable to exchange call control and audio communications signalling between the telephone line interface and the POD interface;
b. at least one POD unit, each such POD unit having a microphone, a loudspeaker, a base interface and a POD control processor interconnecting the microphone, loudspeaker and base interface to exchange communications signalling with the base station via the POD interface and base interface and operable to filter out audio signalling received over the base interface from the signal produced by the microphone supplied to the base interface; and
wherein the base POD interface prevents audio signaling communication between each POD.
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Abstract
A wireless conference phone system has a base station to couple at least one conference unit to a telephone network, such as the public switched telephone network (PSTN) or a digital telephone network such as a voice over internet protocol (VolP) network. Each conference unit performs echo cancellation of the audio signal received from a remote location allowing a simplified base station implementation
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Citations
19 Claims
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1. A conference phone system comprising:
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a. a base station having a telephone line interface, a POD interface and a base control processor coupled to the telephone line interface and the POD interface operable to exchange call control and audio communications signalling between the telephone line interface and the POD interface;
b. at least one POD unit, each such POD unit having a microphone, a loudspeaker, a base interface and a POD control processor interconnecting the microphone, loudspeaker and base interface to exchange communications signalling with the base station via the POD interface and base interface and operable to filter out audio signalling received over the base interface from the signal produced by the microphone supplied to the base interface; and
wherein the base POD interface prevents audio signaling communication between each POD. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for conducting a conference call using a base station with a call control processor controlling a telephone line interface connected to a telephone network and a POD interface operable to exchange call control and audio communications signalling between the telephone network and the POD interface and at least one POD control processor unit controlling a microphone, a loudspeaker and a base interface to exchange communications signalling with the base station POD interface comprising the steps of:
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a. producing audio output on each POD loudspeaker corresponding to audio signalling received from the telephone network;
b. performing echo cancellation processing at the POD control processor on the audio signalling produced by the microphone to remove the audio output produced by step a; and
c. delivering the echo cancellation output produced by each POD to the base station call control processor for summing and delivery into the telephone network and blocking a side-tone of a POD from delivery to another POD. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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Specification