Patent Document ID: 20140046673
Application ID: 14058498
Patent Flag: 0

Claim One:
1. An audio encoder configured to generate encoded audio data in response to input audio data, said encoder including at least one multistage filter coupled and configured to filter the audio data, wherein the multistage filter includes: a buffer memory; at least two biquad filter stages, including a first biquad filter stage and a subsequent biquad filter stage; and a controller, coupled to the biquad filter stages and configured to assert a single stream of instructions to both the first biquad filter stage and the subsequent biquad filter stage, wherein said first biquad filter stage and said subsequent biquad filter stage operate independently and in parallel in response to the stream of instructions, wherein the first biquad filter stage is coupled to the memory and configured to perform biquadratic filtering on a block of N input samples in response to the stream of instructions to generate intermediate values, and to assert the intermediate values to the memory, wherein the intermediate values include a filtered version of each of at least a subset of the input samples, and wherein the subsequent biquad filter stage is coupled to the memory and configured to perform biquadratic filtering on buffered values retrieved from the memory in response to the stream of instructions to generate a block of output values, wherein the output values include an output value corresponding to each of the input samples in the block of N input samples, and the buffered values include at least some of the intermediate values generated in the first biquad filter stage in response to the block of N input samples.