FIR Filter with Integrated Gain and Compression
Quickfilter Technologies Inc. has developed an audio applications-specific FIR (Finite Impulse Response) filter chip that will enable audio equipment designers to achieve higher audio quality at a low cost. The QF1Da512 SavFIRe (Simple and versatile FIR engine) is believed to be the industry's first audio applications-specific FIR filter to contain an integrated gain and compressor stage that directly addresses the issue of dynamic range loss in audio equalization applications. The Digital Gain and Compression (DGC) feature in the QF1Da512 SavFIRe also known as the Audio SavFIRe combines both gain and compression in one operational block. The compression is performed sample by sample with an instant attack and release. The slope of the compression curve is adjusted as the gain increases. The gain block is configured to provide up to 24 dB of positive digital gain. This combines to yield the maximum in dynamic range without distortion. As a result, the QF1Da512 SavFIRe allows manufacturers to use lower-cost speakers while providing audio quality equivalent to high-end speakers.