System and method for audio sample rate conversion
First Claim
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1. A method for audio sample rate conversion, comprising:
- receiving an audio signal at a first rate, the audio signal having a fundamental frequency;
determining absolute derivatives of the audio signal at the first rate including a first order derivative and at least one derivative higher than a first order derivative;
generating a weighted sum of the absolute derivatives to arrive at a combined absolute derivative;
analyzing the combined absolute derivative to locate a local minimum of the combined absolute derivative;
selecting a location in the audio signal based on the local minimum of the combined absolute derivative; and
altering at least one audio sample of the audio signal at the selected location to develop an audio signal at a second rate.
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Abstract
A method for audio sample rate conversion may include receiving an audio signal at a first rate, the audio signal having a fundamental frequency, determining absolute derivatives of the audio signal at the first rate, and generating a weighted sum of the absolute derivatives to arrive at a combined absolute derivative. The combined absolute derivative may be analyzed to locate a local minimum of the combined absolute derivative, a location in the audio signal may be selected based on the local minimum of the combined absolute derivative and at least one audio sample in the audio signal may be altered at the selected location to develop an audio signal at a second rate.
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Citations
36 Claims
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1. A method for audio sample rate conversion, comprising:
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receiving an audio signal at a first rate, the audio signal having a fundamental frequency; determining absolute derivatives of the audio signal at the first rate including a first order derivative and at least one derivative higher than a first order derivative; generating a weighted sum of the absolute derivatives to arrive at a combined absolute derivative; analyzing the combined absolute derivative to locate a local minimum of the combined absolute derivative; selecting a location in the audio signal based on the local minimum of the combined absolute derivative; and altering at least one audio sample of the audio signal at the selected location to develop an audio signal at a second rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for audio sample rate conversion, comprising:
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a memory for receiving an audio signal at a first rate, the audio signal having a fundamental frequency; logic for determining absolute derivatives of the audio signal at the first rate including a first order derivative and at least one derivative higher than a first order derivative; logic for generating a weighted sum of the absolute derivatives to arrive at a combined absolute derivative; logic for analyzing the combined absolute derivative to locate a local minimum; logic for selecting a location in the audio signal based on the local minimum of the combined absolute derivative; and logic for altering at least one audio sample of the audio signal at the selected location to develop an audio signal at a second rate; and a digital-to-analog converter for providing the audio signal at the second rate. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for audio sample rate conversion, comprising:
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receiving an audio signal at a first rate, the audio signal having a fundamental frequency; determining absolute derivatives of the audio signal at the first rate, the absolute derivatives comprising at least two derivatives higher other than a first order derivative; generating a weighted sum of the absolute derivatives to arrive at a combined absolute derivative; analyzing the combined absolute derivative to locate a local minimum of the combined absolute derivative; selecting a location in the audio signal based on the local minimum of the combined absolute derivative; and altering at least one audio sample of the audio signal at the selected location to develop an audio signal at a second rate. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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30. An apparatus for audio sample rate conversion, comprising:
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a memory for receiving an audio signal at a first rate, the audio signal having a fundamental frequency; logic for receiving an audio signal at a first rate, the audio signal having a fundamental frequency; logic for determining absolute derivatives of the audio signal at the first rate, the absolute derivatives comprising at least two derivatives higher than a first order derivative; logic for generating a weighted sum of the absolute derivatives to arrive at a combined absolute derivative; logic for analyzing the combined absolute derivative to locate a local minimum of the combined absolute derivative; logic for selecting a location in the audio signal based on the local minimum of the combined absolute derivative; and logic for altering at least one audio sample of the audio signal at the selected location to develop an audio signal at a second rate. - View Dependent Claims (31, 32, 33, 34, 35, 36)
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Specification