VOICE CODER WITH TWO MICROPHONE SYSTEM AND STRATEGIC MICROPHONE PLACEMENT TO DETER OBSTRUCTION FOR A DIGITAL COMMUNICATION DEVICE
First Claim
1. A system to support background noise reduction in a communication device, comprising:
- a first microphone located at a first location and operable to collect primarily a user'"'"'s voice signal;
a second microphone located at a second location and operable to collect a primarily background signal other than the user'"'"'s voice signal; and
a voice coder operable to;
receive signals from both the first microphone and the second microphone; and
generate an enhanced signal with reduced noise and improved signal-to-noise ratio (SNR).
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Accused Products
Abstract
The present invention provides a voice coder for voice communication that employs a multi-microphone system as part of an improved approach to enhancing signal quality and improving the signal to noise ratio for such voice communications, where there is a special relationship between the position of a first microphone and a second microphone to provide the communication device with certain advantageous physical and acoustic properties. In addition, the communication device can have certain physical characteristics, and design features. In a two microphone arrangement, the first microphone is located in a location directed toward the speech source, while the second microphone is located in a location that provides a voice signal with significantly lower signal-to-noise ratio (SNR).
31 Citations
34 Claims
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1. A system to support background noise reduction in a communication device, comprising:
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a first microphone located at a first location and operable to collect primarily a user'"'"'s voice signal; a second microphone located at a second location and operable to collect a primarily background signal other than the user'"'"'s voice signal; and a voice coder operable to; receive signals from both the first microphone and the second microphone; and generate an enhanced signal with reduced noise and improved signal-to-noise ratio (SNR). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method to support background noise reduction in a communication device, comprising:
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collecting primarily a user'"'"'s voice signal via a first microphone; collecting a primarily background signal other than the user'"'"'s voice signal via a second microphone; compensating or removing background ambient noise from the first microphone signal using the background noise signal from the second microphone; and generating an enhanced signal with reduced noise and improved signal-to-noise ratio (SNR). - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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33. A system to support background noise reduction in a communication device, comprising:
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means for collecting primarily a user'"'"'s voice signal via a first microphone; means for collecting a primarily background signal other than the user'"'"'s voice signal via a second microphone; means for compensating or removing background ambient noise from the first microphone signal using the background noise signal from the second microphone; and means for generating an enhanced signal with reduced noise and improved signal-to-noise ratio (SNR).
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34. A system to support background noise reduction in a communication device, comprising:
a voice coder operable to; accept and process signals from a plurality of microphones using appropriate coding scheme; compensate or remove background noise from one of the plurality of microphones signals using the background noise from rest of the plurality of microphone signals; generate an enhanced signal with reduced noise and improved signal-to-noise ratio (SNR); and provide the enhanced signal to a speaker and/or speaker phone; wherein at least one of the plurality of microphones is primarily for the sensing and transducing of a user'"'"'s voice and at least one of the plurality of microphones is primarily for sensing and transducing background or ambient sounds or noise other than the user'"'"'s voice.
Specification