Active noise and vibration cancellation system
US5619581A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 1994 |
| Grant date | Apr 8, 1997 |
| Priority date | — |
| Expiry date | May 18, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K2210/3214
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An active noise and vibration control system (20) for cancellation of noise or vibration. The system (20) provides a system whereby the adaptation path and feedforward path are implemented in separate hardware. As a result, the computational burden on the digital signal processor (DSP) (28) is reduced allowing the DSP (28) to handle multiple inputs (22), error sensors (34), and transducers (32). In one embodiment, the processing of the input signal from sensor (22) takes place in a waveform generator (24) comprising a phase-locked loop, a frequency divider, a shift register, and at least one switched capacitor filter. In another embodiment the input signal processing takes place in separate feedforward circuitry including a field programmable gate array (64).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.