Digital speech processing system
First Claim
1. A method of operation in a speech processing system, including receiving an incoming audio frequency signal by the speech processing system, amplifying the incoming audio frequency signal by an audio gain factor, representing the amplified audio signal by a finite range of audio levels, and adjusting the audio gain factor by applying the following steps:
- in an attack mode initiated when a speech signal is detected to be present, analyzing one or more speech blocks of the amplified audio frequency signal to determine whether clipping of the amplified audio frequency signal has taken place;
in a hold mode applied whilst no gain adjustment is being applied and when it is detected in the attack mode that clipping has taken place, analyzing the energy level of one or more blocks of the amplified audio frequency signal to determine what required adjustment should be applied to the audio gain factor; and
in a release mode applied following the hold mode, adjusting the audio gain factor according to the required adjustment determined in the hold mode.
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Accused Products
Abstract
In a speech processing system (10) characterized by a finite range of audio levels, the speech processing system (10) receiving an incoming audio signal, the speech processing system amplifying (12) the incoming audio signal by an audio gain factor, the speech processing system (10) representing the amplified audio signal by the finite range of audio levels, a method for adjusting the audio gain factor, including the steps of: decreasing the audio gain factor when detecting clipping of the amplified audio signal, maintaining the audio gain factor for a hold time period, and increasing the gain factor when detecting that the result of amplification of the incoming sound levels by the audio gain factor, is lower than the highest level of the finite range of audio levels.
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Citations
15 Claims
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1. A method of operation in a speech processing system, including receiving an incoming audio frequency signal by the speech processing system, amplifying the incoming audio frequency signal by an audio gain factor, representing the amplified audio signal by a finite range of audio levels, and adjusting the audio gain factor by applying the following steps:
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in an attack mode initiated when a speech signal is detected to be present, analyzing one or more speech blocks of the amplified audio frequency signal to determine whether clipping of the amplified audio frequency signal has taken place;
in a hold mode applied whilst no gain adjustment is being applied and when it is detected in the attack mode that clipping has taken place, analyzing the energy level of one or more blocks of the amplified audio frequency signal to determine what required adjustment should be applied to the audio gain factor; and
in a release mode applied following the hold mode, adjusting the audio gain factor according to the required adjustment determined in the hold mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification