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US 8,798,278 B2Granted
Dynamic gain adjustment based on signal to ambient noise level
AssigneeBose Corporation
InventorsSteven H. Isabelle, Vasu Iyengar
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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.
Claims11
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.
2 more elements
A communications device comprising:
- 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.
2 more elements
Dependencies are inferred from the claim text.