Unaliased quadrature audio synthesizer
US4607642A · kind A · utility
9Cited by
0References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 19, 1984 |
| Grant date | Aug 26, 1986 |
| Priority date | — |
| Expiry date | Apr 19, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S15/8979
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The apparatus described unaliases a Doppler signal which is related to the velocity of blood flowing in a sample volume. It then generates an audio output corresponding to the unaliased Doppler signal. The device generates an unaliased, instantaneous signal which corresponds to the Doppler frequency associated with the blood velocity in the sample volume. That unaliased instantaneous frequency is fed into programmable read only memories (PROMs) which provide digitized values for the sine and cosine functions. Those values are fed into digital-to-analog converters, and they are scaled to provide audio outputs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.