Spatialization using stereo decorrelation

A method for spatialization using stereo decorrelation, in an audio system having left and right input channels, the method comprising:

• generating decorrelated left and right signals by:
• filtering the left input channel using an all-pass filter with a first group delay;
• filtering the right input channel using an all-pass filter with a second group delay;
• the second group delay being different than that of the first group delay;
• subtracting the decorrelated left signal from the decorrelated right signal to create a second left signal;
• subtracting the decorrelated right signal from the decorrelated left signal to create a second right signal;
• generating a side signal by adding the filtered left input channel signal and the filtered right input channel signal;
• applying gain to the second left and right signals, and the side signal;
• where the gain applied to the side signal is greater than the gain applied to either of the second left second right signals;
• filtering the second left and second right signals to enhance high frequencies, and filtering the side signal to enhance low frequencies;
• adding the side signal to the second left signal to generate a left output signal;
• adding the side signal to the second right signal to generate a right output signal;
• and,
• adding a delay to the second left and second right signals before the side signal is added to the second left and second right signals to generate the right output signal and the left output signal.

A method for spatialization using stereo decorrelation, in an audio system having left and right input channels, the method comprising:

• generating decorrelated left and right signals by:
• filtering the left input channel using an all-pass filter with a first group delay;
• filtering the right input channel using an all-pass filter with a second group delay;
• the second group delay being different than that of the first group delay;
• and,
• subtracting the decorrelated right signal from the decorrelated left signal to create a side signal.

A method for spatialization using stereo decorrelation, in an audio system having left and right input channels, the method comprising:

• generating decorrelated left and right signals by:
• filtering the left input channel using an all-pass filter with a first group delay;
• filtering the right input channel using an all-pass filter with a second group delay;
• the second group delay being different than that of the first group delay;
• subtracting the decorrelated right signal from the decorrelated left signal to create a side signal;
• filtering the left and right input channels to enhance high frequencies and filtering the side signal to enhance low frequencies;
• applying gain to the left and right input channels;
• adding a delay to the side signal;
• applying gain to the side signal, where the gain applied to the side signal is greater than the gain applied to either of the left and right input channels;
• adding the side signal to the left input channel to recreate a left stereo channel;
• inverting the side signal;
• and,
• adding the inverted side signal to the right input channel to recreate a right stereo signal.

An article of manufacture comprising a computer-readable medium having computer-executable instructions for performing a method of spatialization using stereo decorrelation, in an audio system having left and right input channels, the method comprising:

• generating decorrelated left and right signals by:
• filtering the left input channel using an all-pass filter with a first group delay;
• filtering the right input channel using an all-pass filter with a second group delay;
• the second group delay being different than that of the first group delay;
• subtracting the decorrelated left signal from the decorrelated right signal to create a second left signal;
• subtracting the decorrelated right signal from the decorrelated left signal to create a second right signal;
• generating a side signal by adding the filtered left input channel signal and the filtered right input channel signal;
• adding the side signal to the second left signal to generate a left output signal;
• and,
• adding the side signal to the second right signal to generate a right output signal.

An article of manufacture comprising a computer-readable medium having computer-executable instructions for performing a method of spatialization using stereo decorrelation, in an audio system having left and right input channels, the method comprising:

• generating decorrelated left and right signals by:
• filtering the left input channel using an all-pass filter with a first group delay;
• filtering the right input channel using an all-pass filter with a second group delay;
• the second group delay being different than that of the first group delay;
• subtracting the decorrelated left signal from the decorrelated right signal to create a second left signal;
• subtracting the decorrelated right signal from the decorrelated left signal to create a second right signal;
• generating a side signal by adding the filtered left input channel signal and the filtered right input channel signal;
• applying gain to the second left and right signals, and the side signal;
• where the gain applied to the side signal is greater than the gain applied to either of the second left second right signals;
• filtering the second left and second right signals to enhance high frequencies, and filtering the side signal to enhance low frequencies;
• adding the side signal to the second left signal to generate a left output signal;
• adding the side signal to the second right signal to generate a right output signal;
• and,
• adding a delay to the second left and second right signals before the side signal is added to the second left and second right signals to generate the right output signal and the left output signal.

An article of manufacture comprising a computer-readable medium having computer-executable instructions for performing a method of spatialization using stereo decorrelation, in an audio system having left and right input channels, the method comprising:

• generating decorrelated left and right signals by:
• filtering the left input channel using an all-pass filter with a first group delay;
• filtering the right input channel using an all-pass filter with a second group delay;
• the second group delay being different than that of the first group delay;
• and,
• subtracting the decorrelated right signal from the decorrelated left signal to create a side signal.

An article of manufacture comprising a computer-readable medium having computer-executable instructions for performing a method of spatialization using stereo decorrelation, in an audio system having left and right input channels, the method comprising:

• generating decorrelated left and right signals by:
• filtering the left input channel using an all-pass filter with a first group delay;
• filtering the right input channel using an all-pass filter with a second group delay;
• the second group delay being different than that of the first group delay;
• subtracting the decorrelated right signal from the decorrelated left signal to create a side signal;
• filtering the left and right input channels to enhance high frequencies and filtering the side signal to enhance low frequencies;
• applying gain to the left and right input channels;
• adding a delay to the side signal;
• applying gain to the side signal, where the gain applied to the side signal is greater than the gain applied to either of the left and right input channels;
• adding the side signal to the left input channel to recreate a left stereo channel;
• inverting the side signal;
• and,
• adding the inverted side signal to the right input channel to recreate a right stereo signal.

A circuit for generating spatialization in an audio system using stereo decorrelation, the circuit comprising:

• left and right decorrelators;
• a first adder configured to subtract the output of the left decorrelator from the output of the right decorrelator to;
• the adder having an output connected to a left signal path;
• a second adder configured to subtract the output of the right decorrelator from the output of the left decorrelator to;
• the adder having an output connected to a right signal path;
• a third adder configured to add the outputs of the left and right decorrelators;
• the output of the third adder connected to a side signal path;
• a fourth adder configured to add the outputs of the first and third adders;
• the fourth adder connected to the left signal path and the side signal path;
• the output of the fourth adder connected to a left output signal path;
• and,
• a fifth adder configured to add the outputs of the second and third adders;
• the fifth adder connected to the right signal path and the side signal path;
• the output of the fifth adder connected to a right output signal path.

A circuit for generating spatialization in an audio system using stereo decorrelation, the system having left and right input channels;

• the circuit comprising:
• left and right decorrelators connected to the left and right input channels, respectively;
• a first adder configured to add the output of the left decorrelator and the output of the right decorrelator;
• the adder having an output connected to a side signal path;
• a second adder connected to the left input channel and the side signal path;
• the second adder having a left channel output;
• a third adder connected to the right input channel and the side signal path;
• the third adder having a right channel output.