Tone generation method and apparatus using stored reference calibration coefficients
US4394743A · kind A · utility
3Cited by
10References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 18, 1980 |
| Grant date | Jul 19, 1983 |
| Priority date | — |
| Expiry date | Dec 18, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/505
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A tone generator operates in a multiplicative (19) manner with respect to a reference signal (20) for providing a selectable sequence of tones. A digital calibration coefficient is constructed for at least one tone for modifying (22) the reference signal to a value that produces a predetermined output amplitude for the tone. The coefficient is stored (16) for subsequent recall each time the predetermined output amplitude for the tone is required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.