Methods and apparatus for detecting harmonic structure in a waveform
US5809453A · kind A · utility
17Cited by
7References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 25, 1996 |
| Grant date | Sep 15, 1998 |
| Priority date | — |
| Expiry date | Jan 25, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L2025/937
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The periodicity of a signal from a voice channel is determined by sampling the signal, computing the log power spectrum, optionally thresholding and differencing the power spectrum, and then performing an autocorrelation function of limited order to confine the search for periodicity to spans of up to about 400 Hz to 500 Hz.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.