Method for controlling speed of audio signals
AssigneeLG Electronics Inc.
InventorsWoo Choi, Hye Jeon
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Abstract
A method for controlling the speed of audio signals is provided. The method is based on a TSM that uses an optimized AMDF and an OLA. According to the method, the number of frame sets is differently set depending a TSM speed rate to set the interval of a speed rate, and the number of frame sets required for adjusting the speed rate is determined. Subsequently, a TSM process is performed only when the TSM process is required for the frame set determined to adjust the speed rate, and speed processing is performed such that an input frame becomes an output frame otherwise.
Claims16
A time scale modification (TSM)-based method for controlling the speed of audio signals using an optimized absolute magnitude difference function (AMDF) and an overlap and add (OLA), the method comprising:
- differently setting the number of frame sets depending on a TSM speed rate to set the interval of a speed rate;
- determining the number of frame sets to be TSM-processed so as to adjust the speed rate;
- and
- performing a TSM process only when the TSM process is required for the frame set determined to adjust the speed rate, and performing speed processing such that an input frame becomes an output frame otherwise.
A method for controlling the speed of audio signals, the method comprising:
- reading a sample of an audio file;
- searching/comparing pitches from a predetermined pitch search range;
- and
- increasing or reducing the pitches depending on a speed rate,
- wherein the pitch search range is in a range between Pmax and Pmin, the Pmax has a value of 25/3x (sample rate/1000), and the Pmin has a value of 5/3x (sample rate/1000).
Dependencies are inferred from the claim text.