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Author = Fagan, A.D.;
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Displaying Results 1 - 2 of 2 on page 1 of 1
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A Novel Efficient Algorithm for Music Transposition
(1999)
Lawlor, Bob; Fagan, A.D.
A Novel Efficient Algorithm for Music Transposition
(1999)
Lawlor, Bob; Fagan, A.D.
Abstract:
We present a novel efficient algorithm for scaling the frequency content of an audio signal by any desired factor in the range 0.5 (minus one octave) to 2.0 (plus one octave) enabling a recording to be played in any desired key without affecting the tempo. The algorithm uses an adaptive overlap-add (AOLA) technique to realise the desired frequency scaling without affecting the duration. Informal listening tests show output quality equal to that of a conventional overlap-add algorithm used in many commercially available systems, but offering significant computational saving relative to that algorithm. The algorithm is also used to simultaneously scale both the tempo and key of a recording.
http://mural.maynoothuniversity.ie/9709/
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A novel high quality efficient algorithm for time-scale modification of speech
(1999)
Lawlor, Bob; Fagan, A.D.
A novel high quality efficient algorithm for time-scale modification of speech
(1999)
Lawlor, Bob; Fagan, A.D.
Abstract:
We present a novel efficient algorithm for time-scale modification (TSM) of speech which gives output quality equal to that of a conventional TSM algorithm, but having computational load an order of magnitude less. The algorithm presented uses a fixed length rectangular stepping window and a simple peak alignment criterion to track the local natural scaling factor and adapt the window step size. The desired TSM factor is realised by the appropriate number of applications of the constantly varying local natural scaling factor. The local natural scaling factor estimate is updated at sub-pitch period intervals giving accurate pitch tracking and high quality in the output scaled signal.
http://mural.maynoothuniversity.ie/9768/
Displaying Results 1 - 2 of 2 on page 1 of 1
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