Loading patent…
AssigneeCambridge Signal Technologies, Inc.
InventorRonald P. Genereux
Estimating the term…
A filter and method of adapting a digital filter provides a single fixed finite impulse response (FIR) filter adaptively from measured data, in a manner whereby the filter's frequency and time resolution can be controlled. The resulting filter exhibits properties which allow it to be efficiently implemented in various multi-rate configurations. Specifically, the system and method produce an FIR filter with high resolution at low frequencies by having a large number of coefficients, but reduces resolution at higher frequencies by allowing only a fraction of the coefficients to adapt to the high frequency part of the signal. This is accomplished by using a multi-rate, segmented adaptation procedure, such that resolution and bandwidth are controlled independently at each state. If desired, the resulting filter can be made to approximate constant Q resolution. In addition, by adapting only a short part of the filter at a time, misadjustment is minimized.
A method for generating coefficients of a digital filter of length N operating at a designated bandwidth such that frequency and time resolution characteristics of said filter are jointly controlled, said method comprising the steps of:
An audio equalization system for filtering audio signals over a designated bandwidth in which filter coefficients are generated such that frequency and time resolution characteristics of the system are jointly controlled, said system comprising:
A system for implementing a finite impulse response (FIR) digital filter in which filter coefficients are generated by segmenting the filter into a plurality of time segments, said system comprising:
Dependencies are inferred from the claim text.