| Patent Number |
Title Of Patent |
Date Issued |
| 7295670 |
Howling suppression device and howling suppression method |
November 13, 2007 |
| An acoustic feedback suppression apparatus according to the present invention comprises a notch filter (109) for filtering out acoustic feedback components, a plurality of first sample fast Fourier transformation means (118 to 120) for performing frequency analysis of every 512 data |
| 6404832 |
Filter device and method of acquiring filter coefficients |
June 11, 2002 |
| A filter device includes a first section for receiving data of a desired cutoff frequency. A second section operates for deciding whether the desired cutoff frequency is in a predetermined low frequency band or a predetermined high frequency band. The predetermined low frequency band is |
| 6219392 |
Filter device and method of acquiring filter coefficients |
April 17, 2001 |
| A filter device includes a first section for receiving data of a desired cutoff frequency. A second section operates for deciding whether the desired cutoff frequency is in a predetermined low frequency band or a predetermined high frequency band. The predetermined low frequency band is |
| 5579397 |
Amplifier device for a condenser microphone |
November 26, 1996 |
| A common-source type buffer amplifier circuit has a microphone capsule, a diode and an FET. An output end of the buffer amplifier circuit, or a drain of the FET is connected to an input end of the current mirror circuit. An output end of the current mirror circuit is connected to one |
