Fluid flow control speaker system
US4194095A · kind A · utility
25Cited by
4References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1978 |
| Grant date | Mar 18, 1980 |
| Priority date | — |
| Expiry date | Jan 6, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/2245
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A fluid flow control system has a fluid source and plural flow pipes connected to the fluid source. Each of the pipes has an opening of a specific area corresponding to one of the bit orders of a PCM (Pulse Code Modulated) input signal. The flow-condition of the fluid through each of the pipes is controlled by the PCM signal without changing the PCM signal to an analog signal. The summation of the outflow from each of the pipes combines to produce an analog flow output signal in response to the PCM input signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.