US 6,483,922 B1 · Method and system for generating a simulated reverberation audio signal

Abstract

A method and apparatus for generating a simulated reverberation characteristic in an input audio signal having a plurality of channels, each channel transmitting time-synchronized data elements. The method and apparatus imparts a unique delay to each element of a set of time-synchronized data elements and thereafter delays the data element set through a series of delay elements. Each of a plurality of early reflection taps reads in and outputs a unique linear combination of the delayed data elements. The delayed elements are selectively input to at least one summing filter incorporating a plurality of comb filters. The output of the at least one summing filter is selectively combined based upon a summing scheme to provide a plurality of sum output elements. The sum output elements are combined with the early reflection tap output and a preselected combination of the time-synchronized data elements of the input signal to create a simulated reverberation signal.

Claims28

Dependent claims

A method for generating a simulated reverberation signal having a plurality of output channels, comprising the steps of:

receiving an audio input signal having a plurality of input channels, each input channel containing time-synchronized data elements, the corresponding time-synchronized data elements of the plurality of input channels forming a set of data elements;
imparting a unique delay to each data element of the set of data elements;
repeatedly delaying the set of data elements;
associating a plurality of taps with the repeatedly delayed set of data elements, each tap having a plurality of latch elements equal to the plurality of output channels;
coupling the latch elements of each tap to a distinct linear combination of the repeatedly delayed data elements;
reading into and outputting from each tap a tap output set comprising the distinct linear combination of the data elements;
inputting to each one of a plurality of summing filters a uniquely ordered combination of the repeatedly delayed set of data elements, each uniquely ordered combination comprising a plurality of complementary subsets;
within each summing filter inputting each one of the plurality of complementary subsets into one of a plurality of individual filters;
for each of the plurality of summing filter, combining the output of the individual filters and outputting this combination, each summing filter output being an element of a summing filter output set;
generating the simulated reverberation signal, each of the output channels comprising a summation of a predetermined combination of the summing filter output set elements, the tap output set element of each of the plurality of taps which corresponds to the output channel, and a preselected combination of the time-synchronized data elements of the audio input signal.

7 more elements

A method for generating a simulated reverberation signal having a plurality of output channels, comprising the steps of:

receiving an audio input signal comprising a plurality of input channels, the plurality of input channels continuously transmitting time-synchronized data element sets;
for each data element set, imparting a unique delay to each data element;
repeatedly delaying the data element set;
associating a plurality of taps with the repeatedly delayed data element set, each tap having a plurality of latch elements equal to the plurality of output channels;
coupling the latch elements of each tap to a distinct linear combination of the repeatedly delayed data elements;
reading the distinct linear combination of the repeatedly delayed data elements into each tap and outputting the distinct linear combination of the repeatedly delayed data elements from each tap as a tap set;
recursively generating a uniquely ordered combination of the repeatedly delayed data element set, each uniquely ordered combination comprising a plurality of complementary subsets;
for each uniquely ordered combination of the repeatedly delayed data element set, inputting each one of the plurality of complementary subsets thereof into one of a plurality of individual filters and combining outputs of each of the plurality of individual filters corresponding to the uniquely ordered combination of the repeatedly delayed data element set, thereby generating an adder sum set;
selectively combining individual adder sum set elements to produce an adder output sum set having a number of elements equal to the plurality of output channels;
combining corresponding elements of the plurality of tap sets to produce tap output sum sets having a number of elements equal to the plurality of output channels;
combining corresponding elements of the adder output sum set and the tap output sum set and a preselected combination of the time-synchronized data element set to produce an output data element set having a reverberation effect introduced therein.

8 more elements

A system for generating a simulated reverberation signal having a plurality of output channels comprising:

a preprocessor stage which receives an audio input signal comprising a set of time-synchronized data elements, the preprocessor stage comprising:
a delay component for imparting a unique delay to each element of the time-synchronized data element set;
a series of memory elements connected to the delay component, a first memory element receiving the set of uniquely delayed time-synchronized data elements and each of the plurality of memory elements imparting a delay to the set of uniquely delayed time-synchronized data elements;
and
a plurality of taps, each tap having a plurality of latch elements equal to the number of output channels, each tap coupled to the series of memory elements at a unique delay wherein the plurality of latch elements of each tap align with a unique linear combination of time-synchronized data elements and each tap reads in the unique linear combination of the synchronized data elements and outputs a tap data set;
a diffused field processor stage which receives the delayed set of uniquely delayed time-synchronized data elements, the processor stage comprising:
a first processor for receiving the delayed set of uniquely delayed time-synchronized data elements and generating a set of combinations of the delayed set of uniquely delayed time-synchronized data elements, each element of the combinations set comprising a uniquely ordered combination of the set of uniquely delayed time-synchronized data elements;
a memory for receiving and storing the combinations set;
and
a plurality of summing filters connected to the first processor, each of the plurality of summing filters comprising a plurality of filters, wherein the output of the plurality of filters of each summing filter are summed and output from the summing filter;
and
wherein the first processor transfers to each of the plurality of summing filters a distinct one of the elements of the combinations set such that each one of a plurality of complementary subsets of the uniquely ordered combination is input to each of the plurality of filters and the output of each summing filter is output from the diffused field processor stage;
and
a post processor stage which receives the output of each summing filter, the set of time-synchronized data elements and the tap data set of each tap, the post processor stage comprising:
a second processor for receiving the output of each summing filter, the set of time-synchronized data elements and the tap data set of each tap and selectively combining the outputs of the summing filters into a sum output set, the sum output set having a number of elements equal to number of output channels;
and
a plurality of adders connected to the second processor, each of the adders receiving from the second processor a distinct element of the sum output set, a corresponding element of the tap data set of each tap, and preselected combination of the time-synchronized data elements, wherein each adder adds the received elements and provides an output for each of the plurality of output channels.

14 more elements

A system for generating a simulated reverberation signal having a plurality of output channels comprising:

a preprocessor stage which receives an audio input signal comprising a set of time-synchronized data elements, the preprocessor stage comprising:
a series of memory elements connected to the delay component, a first memory element receiving the set of uniquely delayed time-synchronized data elements and each of the plurality of memory elements imparting a delay to the set of uniquely delayed time-synchronized data elements;
and
a plurality of taps, each tap having a plurality of latch elements equal to the number of output channels, each tap coupled to the series of memory elements at a unique delay wherein the plurality of latch elements of each tap align with a unique linear combination of time-synchronized data elements and each tap reads in the unique linear combination of the synchronized data elements and outputs a tap data set;
a diffused field processor stage which receives the delayed set of uniquely delayed time-synchronized data elements, the processor stage comprising:
a first processor for receiving the delayed set of uniquely delayed time-synchronized data elements and generating a set of combinations of the delayed set of uniquely delayed time-synchronized data elements, each element of the combinations set comprising a uniquely ordered combination of the set of uniquely delayed time-synchronized data elements;
a memory for receiving and storing the combinations set;
and
a plurality of summing filters connected to the first processor, each of the plurality of summing filters comprising a plurality of filters, wherein the output of the plurality of filters of each summing filter are summed and output from the summing filter;
and
wherein the first processor transfers to each of the plurality of summing filters a distinct one of the elements of the combinations set such that each one of a plurality of complementary subsets of the uniquely ordered combination is input to each of the plurality of filters and the output of each summing filter is output from the diffused field processor stage;
and
a post processor stage which receives the output of each summing filter, the set of time-synchronized data elements and the tap data set of each tap, the post processor stage comprising:
a second processor for receiving the output of each summing filter, the set of time-synchronized data elements and the tap data set of each tap and selectively combining the outputs of the summing filters into a sum output set, the sum output set having a number of elements equal to number of output channels;
and
a plurality of adders connected to the second processor, each of the adders receiving from the second processor a distinct element of the sum output set, a corresponding element of the tap data set of each tap, and preselected combination of the time-synchronized data elements, wherein each adder adds the received elements and provides an output for each of the plurality of output channels.

13 more elements

A system for generating a simulated reverberation signal having a plurality of output channels comprising:

a preprocessor stage which receives an audio signal comprising a set of time-synchronized data elements, the preprocessor stage comprising:
a delay component for imparting a unique delay to each element of the time-synchronized data element set;
a series of memory elements connected to the delay component, a first memory element receiving the set of uniquely delayed time-synchronized data elements and each of the plurality of memory elements imparting a delay to the set of uniquely delayed time-synchronized data elements;
and
a diffused field processor stage which receives the delayed set of uniquely delayed time-synchronized data elements, the processor stage comprising:
a first processor for receiving the delayed set of uniquely delayed time-synchronized data elements and generating a set of combinations of the delayed set of uniquely delayed time-synchronized data elements, each element of the combinations set comprising a uniquely ordered combination of the set of uniquely delayed time-synchronized data elements;
a memory for receiving and storing the combinations set;
and
a plurality of summing filters connected to the first processor, each of the plurality of summing filters comprising a plurality of filters, wherein the output of the plurality of filters of each summing filter are summed and output from the summing filter;
and
wherein the first processor transfers to each of the plurality of summing filters a distinct one of the elements of the combinations set such that each one of a plurality of complementary subsets of the uniquely ordered combination is input to each of the plurality of filters and the output of each summing filter is output from the diffused field processor stage;
and
a post processor stage which receives the output of each summing filter and the set of time-synchronized data elements, the post processor stage comprising:
a second processor for receiving the output of each summing filter and the set of time-synchronized data elements and selectively combining the outputs of the summing filters into a sum output set, the sum output set having a number of elements equal to number of output channels;
and
a plurality of adders connected to the second processor, each of the adders receiving from the second processor a distinct element of the sum output set and preselected combination of the time-synchronized data elements, each adder adding the received elements and providing an output for each of the plurality of output channels.

13 more elements

Dependencies are inferred from the claim text.

Method and system for generating a simulated reverberation audio signal

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Method and system for generating a simulated reverberation audio signal

Life of this patent

Abstract

Claims28