Real time pitch detection by stream processing
US4486900A · kind A · utility
56Cited by
4References
12Claims
0Family size
Assignee
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Key dates
| Filing date | Mar 30, 1982 |
| Grant date | Dec 4, 1984 |
| Priority date | — |
| Expiry date | Mar 30, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/90
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Continuous stream processing of an input signal to find the autocorrelation function and pitch period is simplied. The input speech signal is sampled at 8 khz, from which the autocorrelation function is formed by multiplying each sample by a stored-delay reduced sequence of up to 30 past samples. The reduced sequence is formed by every fourth sample of input signal gated to storage. Autocorrelation values are sequentially compared by a peak-peaker for maxima, thus further minimizing storage requirements to find the pitch period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.