A METHOD AND APPARATUS FOR PROCESSING AN AUDIO SIGNAL STREAM TO ATTENUATE AN UNWANTED SIGNAL PORTION

• Main Author: PRICE, Caleb Maynard
• Format: Patent
• Language: English; French; German
• Published: 14.07.2021
• Subjects: ACOUSTICS; MUSICAL INSTRUMENTS; PHYSICS; SPEECH ANALYSIS OR SYNTHESIS; SPEECH OR AUDIO CODING OR DECODING; SPEECH OR VOICE PROCESSING; SPEECH RECOGNITION

A method of processing an audio signal stream to attenuate an unwanted signal portion, the method comprising the steps of(a) providing a filter block having an input port and an output port, the filter block having an inactive state in which signals pass from the input port to the output port without being filtered and an active state in which signals are filtered to attenuate an unwanted signal portion as they pass from the input port to the output port;(b) providing the audio signal stream to the input port of the filter; and,(c) whilst the audio signal stream is being provided to the input port of the filter-(i) calculating the entropy of at least a portion of the audio signal stream;(ii) comparing the calculated entropy to a threshold value; and,(iii) setting the state of the filter block to be either active or inactive depending on the comparison between the calculated entropy and the threshold value.