Wireless telephone with multiple microphones and multiple description transmission
First Claim
1. A wireless telephone, comprising:
- a receiver configured to receive multiple versions of a voice signal from a second wireless telephone via a communications link between the wireless telephone and the second wireless telephone, each version being produced from a microphone in a microphone array of the second wireless telephone;
a decoder coupled to the receiver and configured to decode the multiple versions of the voice signal to produce an output signal, wherein for each voice frame of the multiple versions of the voice signal, the decoder is further configured to estimate channel impairments caused by transmission via the communications link and decode one of the multiple versions of the voice signal with the least channel impairments, whereby the decoded version is used as the output signal for the respective voice frames; and
a speaker configured to receive the output signal and produce a sound pressure wave corresponding thereto.
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Accused Products
Abstract
The present invention is directed to a multiple description transmission system that provides redundancy to combat transmission channel impairments. The multiple description transmission system includes a first and second wireless telephone. The first wireless telephone includes the following: an array of microphones, wherein each microphone in the array of microphones is configured to receive voice input from a user and to produce a voice signal corresponding thereto; an encoder coupled to the microphone array and configured to encode each of the voice signals; and a transmitter coupled to the encoder and configured to transmit each of the encoded voice signals. The second wireless telephone includes the following: a receiver configured to receive the transmitted signals; a decoder coupled to the receiver and configured to decode the signals received by the receiver, thereby producing an output signal; and a loudspeaker that receives the output signal and produces a pressure sound wave corresponding thereto.
116 Citations
18 Claims
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1. A wireless telephone, comprising:
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a receiver configured to receive multiple versions of a voice signal from a second wireless telephone via a communications link between the wireless telephone and the second wireless telephone, each version being produced from a microphone in a microphone array of the second wireless telephone; a decoder coupled to the receiver and configured to decode the multiple versions of the voice signal to produce an output signal, wherein for each voice frame of the multiple versions of the voice signal, the decoder is further configured to estimate channel impairments caused by transmission via the communications link and decode one of the multiple versions of the voice signal with the least channel impairments, whereby the decoded version is used as the output signal for the respective voice frames; and a speaker configured to receive the output signal and produce a sound pressure wave corresponding thereto. - View Dependent Claims (2, 3)
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4. A wireless telephone, comprising:
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a receiver configured to receive multiple versions of a voice signal from a second wireless telephone via a communications link between the wireless telephone and the second wireless telephone, each version being produced from a microphone in a microphone array of the second wireless telephone; a decoder coupled to the receiver and configured to decode the multiple versions of the voice signal to produce an output signal, wherein for each voice frame of the multiple versions of the voice signals, the decoder is further configured to set a threshold of channel impairments caused by transmission via the communications link and dynamically discard at least one of the multiple versions of the voice signal having a channel impairment worse than the threshold; and a speaker configured to receive the output signal and produce a sound pressure wave corresponding thereto. - View Dependent Claims (5, 6)
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7. A wireless telephone, comprising:
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a receiver configured to receive multiple versions of a voice signal from a second wireless telephone via a communications link between the wireless telephone and the second wireless telephone, each version being produced from a microphone in a microphone array of the second wireless telephone; a decoder coupled to the receiver and configured to decode the multiple versions of the voice signal to produce an output signal, wherein the multiple versions of the voice signal have been encoded and transmitted at different bit rates by the second wireless telephone, and wherein for each voice frame of the multiple versions of the voice signal received by the receiver, the decoder is further configured to estimate channel impairments caused by transmission via the communications link; and a speaker configured to receive the output signal and produce a sound pressure wave corresponding thereto. - View Dependent Claims (8, 9)
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10. A multiple-description wireless-communication transmission system, comprising:
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a first wireless telephone comprising; an array of microphones, each microphone in the array configured to receive voice input from a user and to produce a voice signal corresponding thereto, thereby providing a plurality of voice signals, an encoder coupled to the array of microphones and configured to encode each of the plurality of voice signals to provide a plurality of encoded voice signals, and a transmitter coupled to the encoder and configured to transmit each of the plurality of encoded voice signals to provide a plurality of transmitted signals; and a second wireless telephone comprising; a receiver configured to receive the plurality of transmitted signals via a communications link, a decoder coupled to the receiver and configured to decode the plurality of signals received by the receiver, thereby producing an output signal, wherein for each voice frame of the plurality of signals received by the receiver, the decoder is further configured to estimate channel impairments caused by transmission of the plurality of transmitted signals between the first and second wireless telephones via the communications link and decode one of the plurality of signals received by the receiver with the least channel impairments, thereby producing the output signal for the respective voice frames, and a speaker configured to receive the output signal and produce a sound pressure wave corresponding thereto. - View Dependent Claims (11, 12)
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13. A multiple-description wireless-communication transmission system, comprising:
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a first wireless telephone comprising an array of microphones, each microphone in the array configured to receive voice input from a user and to produce a voice signal corresponding thereto, thereby providing a plurality of voice signals, an encoder coupled to the array of microphones and configured to encode each of the plurality of voice signals to provide a plurality of encoded voice signals, and a transmitter coupled to the encoder and configured to transmit each of the plurality of encoded voice signals to provide a plurality of transmitted signals; and a second wireless telephone comprising; a receiver configured to receive the plurality of transmitted signals via a communications link, a decoder coupled to the receiver and configured to decode the plurality of signals received by the receiver, thereby producing an output signal, wherein for each voice frame of the plurality of signals received by the receiver, the decoder is further configured to estimate channel impairments caused by transmission of the signals between the first and second wireless telephones via the communications link and dynamically discard at least one of the plurality of received signals having a channel impairment worse than a threshold; and a speaker configured to receive the output signal and produce a sound pressure wave corresponding thereto. - View Dependent Claims (14, 15)
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16. A multiple-description wireless-communication transmission system, comprising:
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a first wireless telephone comprising; an array of microphones, each microphone in the array configured to receive voice input from a user and to produce a voice signal corresponding thereto, thereby providing a plurality of voice signals, an encoder coupled to the array of microphones and configured to encode each of the plurality of voice signals to provide a plurality of encoded voice signals, wherein the encoder is configured to encode one of the voice signals at a first bit rate for transmission over a main channel and each other voice signal at a bit rate different from the first bit rate for transmission over a corresponding auxiliary channel, and a transmitter coupled to the encoder and configured to transmit each of the plurality of encoded voice signals to provide a plurality of transmitted signals; and a second wireless telephone comprising; a receiver configured to receive the plurality of transmitted signals via a communications link, a decoder coupled to the receiver and configured to decode the plurality of signals received by the receiver, thereby producing an output signal, wherein for each voice frame of the plurality signals received by the receiver, the decoder is further configured to estimate channel impairments caused by transmission of the signals between the first and second wireless telephones via the communications link; a speaker configured to receive the output signal and produce a sound pressure wave corresponding thereto. - View Dependent Claims (17, 18)
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Specification