Demodulating wide-band ultrasound signals
US6248071A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 28, 2000 |
| Grant date | Jun 19, 2001 |
| Priority date | — |
| Expiry date | Jan 28, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S15/8979
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A demodulator for use in an ultrasound information processing system is described, where in a preferred embodiment the demodulator uses a half-band filter to perform mirror-cancellation during the demodulation process. The demodulator comprises a mirror canceling quadrature mixer that mixes the input signal with quarter-sampling-frequency sinusoids and then low-pass-filters the mixed signals with half-band filters having a cutoff frequency of one-fourth the sampling frequency. In an ultrasound demodulator in accordance with a preferred embodiment, a significantly sharper mirror cancellation on the wideband input signal is achieved. Additionally, the number and complexity of mirror canceling filter operations significantly reduced, allowing for easier hardware implementation using less expensive, off-the-shelf components. Furthermore, simplified hardware for digitally providing harmonic imaging applications is achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.