Apparatus for converting reproducing speed and method of converting reproducing speed
AssigneeSony Corporation
InventorsAkira Inoue, Masayuki Nishiguchi
Life of this patent
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Abstract
A method and apparatus for converting the reproducing speed of an acoustic signal where, of the acoustic signals held in a data recording section 1, the input acoustic signal s1 (sampled for max. pitch cycle×2) is read from a process-start position P. A low-pass filter 7 controls the high-band component of the acoustic signal s1. A decimation section 8 performs appropriate down-sampling on a signal output from the low pass filter 7. The signal, thus down-sampled, is read into a signal buffer section 9. A down-sampled, input acoustic signal s2 is transferred from the signal buffer section 9 to a pitch-calculating section 3, which calculates a pitch cycle s3.
Claims14
An apparatus for converting an acoustic-signal reproducing speed, comprising:
- recording means for recording and holding acoustic signals;
- decimation means for performing a decimation process on the acoustic signals recorded in the recording means;
- first accumulating means for accumulating acoustic signals down-sampled by the decimation means;
- pitch-calculating means for calculating a pitch cycle of the acoustic signals accumulated in the first accumulating means;
- second accumulating means for accumulating the acoustic signals recorded in the recording means;
- operation means for calculating a waveform similar to a waveform of the pitch cycle calculated by the pitch-calculating means;
- third accumulating means for accumulating data representing the similar waveform calculated by the operation means;
- and
- control means for controlling reading of data into the second accumulating means, the calculation performed in the operation means, and transfer of data to the third accumulating means.
A method of converting an acoustic-signal reproducing speed, compromising:
- a decimation step of performing a decimation process on acoustic signals recorded in recording means;
- a first input-output step of inputting and outputting acoustic signals down-sampled in the decimation step, into and from a first accumulating means;
- a pitch-calculating step of calculating a pitch cycle of the signals accumulated in the first accumulating means;
- a second input-output step of inputting and outputting the acoustic signals recorded in the recording means, into and from a second accumulating means;
- an operation step of calculating a similar waveform similar to a pitch waveform of the pitch cycle calculated in the pitch-calculating step;
- and
- a third input-output step of inputting and outputting data representing the similar waveform calculated in the pitch-calculating step, into and from a third accumulating means.
An apparatus for converting an acoustic-signal reproducing speed, comprising;
- recording means for recording and holding acoustic signals;
- decimation means for performing a decimation process on the acoustic signals recorded in the recording means;
- first accumulating means for accumulating, in units of frames, acoustic signals down-sampled by the decimation means;
- pitch-calculating means for calculating a pitch cycle of the acoustic signals accumulated in the first accumulating means;
- second accumulating means for accumulating, in units of frames, the acoustic signals recorded in the recording means;
- operation means for calculating a similar waveform similar to a waveform of the pitch cycle calculated by the pitch-calculating means;
- third accumulating means for accumulating, in units of frames, data representing the similar waveform calculated by the operation means;
- and
- data-position designating means for controlling a position in the second accumulating means to which acoustic signals are read, a position in the second accumulating means at which the calculation of the pitch cycle is started, a position in the third accumulating means to which the data representing the similar waveform is transferred, and a position in the third accumulating means at which the data representing the similar waveform is recorded.
A method of converting an acoustic-signal reproducing speed, comprising:
- a decimation step of performing a decimation process on acoustic signals recorded in recording means;
- a first input-output step of inputting and outputting, in units of frames, acoustic signals down-sampled in the decimation step, into and from a first accumulating means;
- a pitch-calculating step of calculating a pitch cycle of the signals accumulated in the first accumulating means;
- a second input-output step of inputting and outputting, in units of frames, the acoustic signals recorded in the recording means, into and from a second accumulating means;
- an operation step of calculating a similar waveform similar to a pitch waveform of the pitch cycle calculated in the pitch-calculating step;
- and
- a third input-output step of inputting and outputting data representing the similar waveform calculated in the pitch-calculating step, into and from a third accumulating means.
Dependencies are inferred from the claim text.