Enhancing the Intelligibility of Received Speech in a Noisy Environment
First Claim
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1. A method comprising:
- computing at a local device a long term signal level of an audio signal, wherein the audio signal is transmitted from a remote device and received by the local device;
computing at the local device an automatic gain control (AGC) gain based on the long term signal level;
computing at the local device a noise factor indicative of a level of ambient noise at the local device;
computing at the local device a dynamic range compression (DRC) gain based on the noise factor; and
adjusting at the local device an amplitude of the audio signal based on the AGC gain and the DRC gain.
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Abstract
A long term signal level of an audio signal is computed at a local device, wherein the audio signal was transmitted from a remote device and received by the local device. An automatic gain control (AGC) gain is computed at the local device based on the long term signal level. A noise factor indicative of a level of ambient noise at the local device is computed at the local device. A dynamic range compression (DRC) gain is computed at the local device based on the noise factor. An amplitude of the audio signal is adjusted at the local device based on the AGC gain and the DRC gain.
37 Citations
20 Claims
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1. A method comprising:
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computing at a local device a long term signal level of an audio signal, wherein the audio signal is transmitted from a remote device and received by the local device; computing at the local device an automatic gain control (AGC) gain based on the long term signal level; computing at the local device a noise factor indicative of a level of ambient noise at the local device; computing at the local device a dynamic range compression (DRC) gain based on the noise factor; and adjusting at the local device an amplitude of the audio signal based on the AGC gain and the DRC gain. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An audio signal processor comprising:
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an automatic gain control (AGC) and dynamic range compression (DRC) unit configured to; compute a long term signal level of an audio signal transmitted from a remote device and received by the apparatus, and adjust an amplitude of the audio signal based on an AGC gain and a weighted DRC gain; wherein the AGC and DRC unit comprises; an AGC gain calculator to compute the AGC gain based on the long term signal level; a noise factor calculator to compute a noise factor indicative of a level of ambient noise proximate to the apparatus; and a DRC gain calculator to compute a DRC gain based on the noise factor. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A handheld telephone, comprising:
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a microphone; a speaker; a codec coupled to the microphone and to the speaker; an encoder to encode a signal for transmission; a decoder to decode a signal transmitted from a remote device and received by the handheld telephone and to generate an audio signal; an automatic gain control (AGC) and dynamic range compression (DRC) unit configured to; compute a long term signal level of the audio signal, and adjust an amplitude of the audio signal based on an AGC gain and a weighted DRC gain; wherein the AGC and DRC unit comprises; an AGC gain calculator to compute the AGC gain based on the long term signal level; a noise factor calculator to compute a noise factor indicative of a level of ambient noise proximate to the apparatus; and a DRC gain calculator to compute a DRC gain based on the noise factor.
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Specification