High Frequency Noise Cancelling with low computational requirements:
We pre-calculate the anti-noise transfer function based on the system properties to minimize runtime computational time and load, processing every noise sample as it is captured to enable close alignment of the anti-noise for high frequencies.
Higher Resolution Signal Processing without additional delay or computations:
Our method provides 2x the frequency resolution for a given number of coefficients.
The diagram on the left shows 8 coefficients being used, and usable output requires processing 8 samples of data. If the Fs (sampling rate) was 10 kHz, the expected frequency resolution would be 1250 Hz. Silencer Devices’ method would provide 625 Hz resolution.
Faster Signal Processing and Lower Computational Load in all FIR applications:
We achieve Linear Phase without the usual N/2 delay/latency typically encountered with FIR filters.
To provide the symmetry required for a linear phase response, the coefficient order is normally shifted by N/2 samples in traditional methods, as shown below. This results in the output being delayed by N/2 samples, which may make noise/anti-noise alignment impossible at high frequencies.
The Benefits:
Faster and Higher Resolution FIR Signal Processing – because speed and accuracy matters.
Radically Better Noise Cancelling – covering the full audio range and beyond.
The Noise Cancelling can be scaled to Performance Targets or Cost Constraints.
The near-zero latency provides effectiveness throughout the audio band and implies performance into the GHz range.