Method for automatically adjusting audio response for improved intelligibility
First Claim
1. A method of dynamically altering an audio response of a radio receiver, the method comprising:
- (a) determining an ambient noise level by sampling the ambient noise level using a microphone input;
(b) determining an audio response function in accordance with the ambient noise level; and
(c) adjusting the audio response of the radio receiver in accordance with the audio response function by sacrificing a gain of low audio frequencies in favor of a gain of high audio frequencies without regard to fidelity.
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Abstract
Intelligibility of received speech in a radio receiver is improved by automatically adjusting audio response in accordance with ambient noise levels. When high ambient noise is present, the relative gain of the higher audio frequencies is increased at the expense of low frequency response. In this instance, some "naturalness" is traded for the higher intelligibility provided by increased high frequency gain. The ambient noise level is determined based on either a volume level or a direct sample of ambient noise by a microphone. An audio response message is built in accordance with the ambient noise level, and a digital signal processor adjusts the audio response of the radio receiver in accordance with the audio response message.
281 Citations
21 Claims
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1. A method of dynamically altering an audio response of a radio receiver, the method comprising:
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(a) determining an ambient noise level by sampling the ambient noise level using a microphone input; (b) determining an audio response function in accordance with the ambient noise level; and (c) adjusting the audio response of the radio receiver in accordance with the audio response function by sacrificing a gain of low audio frequencies in favor of a gain of high audio frequencies without regard to fidelity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of dynamically altering an audio response of a radio receiver, the method comprising:
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(a) determining an ambient noise level by sampling the ambient noise level using a microphone input; and (b) adjusting a gain of high audio frequencies relative to a gain of low audio frequencies in accordance with the ambient noise level by sacrificing the gain of low audio frequencies in favor of the gain of high audio frequencies without regard to fidelity. - View Dependent Claims (12)
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13. An apparatus for dynamically altering an audio response of a radio receiver, the apparatus comprising:
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means for determining an ambient noise level comprising a microphone input that samples the ambient noise level; a controller that builds an audio response message in accordance with the ambient noise level; and a digital signal processor (DSP) that adjusts the audio response of the radio receiver in accordance with the audio response message by sacrificing a gain of low audio frequencies in favor of a gain of high audio frequencies without regard to fidelity. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. An apparatus for dynamically altering an audio response of a radio receiver, the apparatus comprising:
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means for determining an ambient noise level comprising a microphone input that samples the ambient noise level; and means for adjusting a gain of high audio frequencies relative to a gain of low audio frequencies in accordance with the ambient noise level by sacrificing the gain of low audio frequencies in favor of the gain of high audio frequencies without regard to fidelity. - View Dependent Claims (21)
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Specification