Digital automatic gain control
First Claim
Patent Images
1. A hearing aid, comprising:
- a microphone to receive an input signal;
anda digital processor to process the input signal at a gain, wherein the processor includes an inhibitor to inhibit distortions and an adjuster to adjust the gain of the input signal, wherein the inhibitor smoothes an envelope of the input signal so as to inhibit distortions arising from apparent modulation of the input signal due to sampling of the input signal.
8 Assignments
0 Petitions
Accused Products
Abstract
Systems, devices, and methods are provided to inhibit apparent amplitude modulation in non-linear processing that causes distortion in a processed signal. One aspect of the invention includes a hearing aid. The hearing aid includes a microphone to receive an input signal, a speaker to reproduce the input signal, and a processor. The processor processes the input signal using a gain. The processor includes an inhibitor, which inhibits distortions, and an adjuster, which adjusts the gain. The inhibitor acts to smooth an envelope of the input signal to inhibit undesired modulation. The adjuster adjusts the gain if the envelope is either above or below a threshold.
-
Citations
20 Claims
-
1. A hearing aid, comprising:
-
a microphone to receive an input signal; and a digital processor to process the input signal at a gain, wherein the processor includes an inhibitor to inhibit distortions and an adjuster to adjust the gain of the input signal, wherein the inhibitor smoothes an envelope of the input signal so as to inhibit distortions arising from apparent modulation of the input signal due to sampling of the input signal. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A method comprising:
-
sampling an input signal; smoothing an envelope of the input signal; and adjusting the gain if the envelope is greater than a threshold, wherein the smoothing inhibits distortions arising from apparent modulation of the input signal produced by sampling the input signal. - View Dependent Claims (7, 8, 9, 10)
-
-
11. An apparatus for processing a digital audio signal, comprising:
-
an adjuster to adjust amplification of the digital audio signal; and a detector to form a smooth envelope that is a rectified version of the digital audio signal, wherein the detector presents the smooth envelope to the adjuster, and wherein the smooth envelope excludes apparent modulation of the digital audio signal. - View Dependent Claims (12, 13, 14, 15)
-
-
16. A hearing aid for processing an input signal, comprising:
-
a preamplifier having a gain to amplify the input signal and produce an amplified input signal; a sampler to sample the amplified input signal; a detector to form a smooth envelope that is rectified; and an adjuster to adjust the gain of the preamplifier if the smooth envelope is greater than a threshold to reduce distortions due to an apparent modulation arising from sampling of the amplified input signal. - View Dependent Claims (17, 18, 19, 20)
-
Specification