Apparatus for appoximating envelope data and for extracting envelope data from a signal
US5548080A · kind A · utility
3Cited by
15References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 25, 1994 |
| Grant date | Aug 20, 1996 |
| Priority date | — |
| Expiry date | Apr 25, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10H1/0575
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An envelope extracting circuit extracts an envelope from the waveform sampled by a musical tone sampling circuit, and stores the envelope data into a memory. An envelope approximating circuit approximates the envelope data as stored in the memory by the function data such as linear or exponential function data. The original envelope is approximated by a limited number of function waveforms whose characteristics change at switching points.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.