DIGITAL AUTOMATIC GAIN CONTROL
First Claim
Patent Images
1. A digital analog gain control, comprising:
- a detector to detect an envelope of an input signal using Hilbert filters;
an adder to provide a difference between the envelope and a threshold; and
an adjuster that adjust a gain if the difference is one of two conditions, wherein the two conditions includes being greater than zero and being less than zero.
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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.
82 Citations
40 Claims
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1. A digital analog gain control, comprising:
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a detector to detect an envelope of an input signal using Hilbert filters; an adder to provide a difference between the envelope and a threshold; and an adjuster that adjust a gain if the difference is one of two conditions, wherein the two conditions includes being greater than zero and being less than zero. - View Dependent Claims (2, 3, 4, 5, 8, 9, 11, 16, 17, 20)
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6-7. -7. (canceled)
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10. (canceled)
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12-15. -15. (canceled)
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18-19. -19. (canceled)
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21-22. -22. (canceled)
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23. A digital analog gain control, comprising:
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a detector to detect an envelope of the input signal using infinite-impulse-response (IIR) filters; an adder to provide a difference between the envelope and a threshold; and an adjuster that receives the difference, a release time constant, and an attack time constant, wherein the adjuster adjust a gain if the difference is one of two conditions, wherein the two conditions includes being a negative number and being a positive number, wherein the adjuster increases the gain if the difference is negative, and wherein the adjuster decreases the gain if the difference is positive. - View Dependent Claims (25, 26)
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24. (canceled)
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27-29. -29. (canceled)
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30. A method for controlling a gain of an amplifier, comprising:
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forming an envelope of an input signal that lacks modulation using Hilbert filters; and subtracting the envelope from a threshold to form a difference, wherein the difference is used to control the gain. - View Dependent Claims (31, 32, 35, 36, 40)
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33-34. -34. (canceled)
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37-39. -39. (canceled)
Specification