Patent ID: 9536532
Date: 2017-01-03
CPC Classifications: G10L

Claim:
1. A method of detecting whether a transient exists within an audio signal, comprising: (a) dividing a segment of a digital audio signal into blocks; (b) calculating a norm value for each of a plurality of the blocks, resulting in a set of norm values for the plurality of blocks, each said norm value representing a measure of signal strength within a corresponding block; (c) identifying a maximum norm value across said plurality of the blocks; (d) applying a test criterion to the norm values; (e) if the test criterion is not satisfied, outputting a first signal indicating that the segment does not include any transient; (f) if the test criterion is satisfied, outputting a second signal indicating that the segment includes a transient; and (g) providing the digital audio signal and at least one of the first signal or the second signal to an audio signal encoder, wherein the test criterion involves a comparison of the maximum norm value to a different second maximum norm value, subject to a specified constraint, within the segment, and wherein said steps (a)-(d) are performed in the time-sampled domain.