US 7,110,940 B2 · Recursive multistage audio processing

Abstract

Efficient recursive audio processing of one or more input data streams using a multistage processor for performing one or more predetermined functions and programmable audio effects. A first stage performs a first predetermined function, such as frequency shifting function. Intermediate results are preferably mixed. The second stage applies programmable audio effects to the mixed data, such as a reverberation effect, and stores the second stage output in a destination mix bin. The second stage output is preferably transferred to a main memory accessible to a primary processor. The second stage output is directed back to the first stage of the multistage processor to perform a second predetermined function, such as three dimensional spatialization. The primary processor modifies parameters of the first predetermined function to efficiently perform dynamic operations, such as Doppler shifts and volume transitions between multiple sound sources and a mixture of those sounds as a single point source.

Claims20

Dependent claims

A method for recursive audio processing using a multistage processor of a computing device, comprising the steps of:

(a) processing first input data with a first predetermined function of a first stage of the multistage processor, to produce an intermediate output;
(b) storing the intermediate output in a location that is accessible to a second stage of the multistage processor;
(c) processing the intermediate output with the second stage to produce a second stage output;
(d) storing the second stage output in a destination location that is accessible to a second predetermined function of the first stage of the multistage processor;
and
(e) processing the second stage output with the second predetermined function of the first stage of the multistage processor, producing at least one output audio signal.

3 more elements

A computing device in which recursive processing is employed to produce at least one audio output signal, comprising:

(a) a primary processor;
(b) a multistage processor that is substantially independent of the primary processor, said multistage processor being programmed with machine instructions stored in a secondary memory for carrying out a plurality of functions for processing audio data;
(c) a sound transducer that is coupled in communication with the primary processor;
and
(d) a primary memory in communication with the multistage processor and with the primary processor and shared by both, said primary memory storing machine instructions that cause the primary processor to carry out a plurality of functions in regard to the audio data that are distinct from the plurality of functions carried out in regard to the audio data by the multistage processor, wherein the plurality of functions carried out by the primary processor and the secondary processor include:
(i) processing first input data with a first predetermined function of a first stage of the multistage processor, to produce an intermediate output;
(ii) storing the intermediate output in a location that is accessible to a second stage of the multistage processor;
(iii) processing the intermediate output with the second stage to produce a second stage output;
(iv) storing the second stage output in a destination location that is accessible to a second predetermined function of the first stage of the multistage processor;
and
(v) processing the second stage output with the second predetermined function of the first stage of the multistage processor, producing at least one output audio signal.

8 more elements

Dependencies are inferred from the claim text.

Recursive multistage audio processing

Life of this patent

Recursive multistage audio processing

Life of this patent

Abstract

Claims20