Dynamic gain adjustment based on signal to ambient noise level
First Claim
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1. A method comprising:
- deriving a signal-to-noise ratio based at least in part on a measured level of a signal carrying far-end speech, a measured level of a signal carrying ambient acoustic noise, and a user-selected gain adjustment provided via a user-operable gain controller;
determining a target gain adjustment based at least in part on the derived signal-to-noise ratio, and based at least in part on a mapping of signal-to-noise ratio to gain in which the mapping approaches a unity gain (0 dB) at high signal-to-noise ratios and has a negative slope of nonincreasing magnitude as the signal-to-noise ratios increase from low to high;
applying the target gain adjustment to the signal carrying far-end speech to produce a gain-adjusted signal; and
providing the gain-adjusted signal for audio output from a communications device.
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Abstract
Methods and apparatuses for deriving a signal-to-noise ratio based at least in part on a measured level of a signal carrying far-end speech, and a measured level of a signal carrying ambient acoustic noise; determining a target gain adjustment based at least in part on the derived signal-to-noise ratio; applying the target gain adjustment to the signal carrying far-end speech to produce a gain-adjusted signal; and providing the gain-adjusted signal for audio output from a communications device.
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Citations
11 Claims
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1. A method comprising:
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deriving a signal-to-noise ratio based at least in part on a measured level of a signal carrying far-end speech, a measured level of a signal carrying ambient acoustic noise, and a user-selected gain adjustment provided via a user-operable gain controller; determining a target gain adjustment based at least in part on the derived signal-to-noise ratio, and based at least in part on a mapping of signal-to-noise ratio to gain in which the mapping approaches a unity gain (0 dB) at high signal-to-noise ratios and has a negative slope of nonincreasing magnitude as the signal-to-noise ratios increase from low to high; applying the target gain adjustment to the signal carrying far-end speech to produce a gain-adjusted signal; and providing the gain-adjusted signal for audio output from a communications device. - View Dependent Claims (2, 3, 4)
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5. A communications device comprising:
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a user-operable gain controller; first circuitry operable to derive a signal-to-noise ratio based at least in part on a measured level of a signal carrying far-end speech, a measured level of a signal carrying ambient acoustic noise, and a user-selected gain adjustment provided via the user-operable gain controller; second circuitry operable to determine a target gain adjustment based at least in part on the derived signal-to-noise ratio, and based at least in part on a mapping of signal-to-noise ratio to gain in which the mapping approaches a unity gain (0 dB) at high signal-to-noise ratios and has a negative slope of nonincreasing magnitude as the signal-to-noise ratios increase from low to high; and third circuitry operable to apply the target gain adjustment to the signal carrying far-end speech to produce a gain-adjusted signal and provide the gain-adjusted signal for output from the device. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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Specification