Producing headphone driver signals in a digital audio signal processing binaural rendering environment
First Claim
1. A method for rendering a sound program in a binaural rendering environment for headphones, comprising:
- receiving an indication of diffuse audio in a sound program;
receiving an indication of direct audio in the sound program;
analyzing a plurality of candidate binaural room impulse responses (BRIRs) to determine a BRIR suitable for diffuse content and another BRIR suitable for direct content;
selecting the BRIR suitable for diffuse content as a selected first BRIR, and selecting the BRIR suitable for direct content as a selected second BRIR;
performing a first binaural rendering process on the diffuse audio to produce a plurality of first intermediate signals, wherein the first binaural rendering process applies the selected first BRIR and a first head related transfer function (HRTF) to the diffuse audio;
performing a second binaural rendering process on the direct audio to produce a plurality of second intermediate signals, wherein the second binaural rendering process applies the selected second BRIR and a second HRTF to the direct audio; and
summing the first and second intermediate signals to produce a plurality of headphone driver signals that are to drive the headphones.
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Abstract
A number of candidate binaural room impulse responses (BRIRs) are analyzed to select one of them as a selected first BRIR that is to be applied to diffuse audio, and another one as a selected second BRIR that is to be applied to direct audio, of a sound program. A first binaural rendering process is performed on the diffuse audio by applying the selected first BRIR and a first head related transfer function (HRTF) to the diffuse audio. A second binaural rendering process is performed on the direct audio by applying the selected second BRIR and a second HRTF to the direct audio. Results of the two binaural rendering processes are combined to produce headphone driver signals. Other embodiments are also described and claimed.
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Citations
22 Claims
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1. A method for rendering a sound program in a binaural rendering environment for headphones, comprising:
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receiving an indication of diffuse audio in a sound program; receiving an indication of direct audio in the sound program; analyzing a plurality of candidate binaural room impulse responses (BRIRs) to determine a BRIR suitable for diffuse content and another BRIR suitable for direct content; selecting the BRIR suitable for diffuse content as a selected first BRIR, and selecting the BRIR suitable for direct content as a selected second BRIR; performing a first binaural rendering process on the diffuse audio to produce a plurality of first intermediate signals, wherein the first binaural rendering process applies the selected first BRIR and a first head related transfer function (HRTF) to the diffuse audio; performing a second binaural rendering process on the direct audio to produce a plurality of second intermediate signals, wherein the second binaural rendering process applies the selected second BRIR and a second HRTF to the direct audio; and summing the first and second intermediate signals to produce a plurality of headphone driver signals that are to drive the headphones. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An audio playback system comprising:
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a processor; and memory having stored therein a plurality of candidate binaural room impulse responses (BRIRs), and instructions that when executed by the processor receive an indication of diffuse audio in a sound program that is to be played back through headphones, receive an indication of direct audio in the sound program, analyze the plurality of candidate BRIRs to determine a BRIR suitable for diffuse content and another BRIR suitable for direct content, select the BRIR suitable for diffuse content as a selected first BRIR, and select the BRIR suitable for direct content as a selected second BRIR, perform a first binaural rendering process on the diffuse audio to produce a plurality of first intermediate signals, wherein the first binaural rendering process applies the selected first BRIR and a first head related transfer function (HRTF) to the diffuse audio, perform a second binaural rendering process on the direct audio to produce a plurality of second intermediate signals, wherein the second binaural rendering process applies the selected second BRIR and a second HRTF to the direct audio, and combine the first and second intermediate signals to produce a plurality of combined headphone driver signals that are to drive the headphones. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. An article of manufacture comprising:
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a non-transitory machine readable storage medium having stored therein a plurality of candidate binaural room impulse responses (BRIRs) and instructions that when executed by a processor analyze the plurality of candidate BRIRs to determine a BRIR suitable for diffuse content and another BRIR suitable for direct content; select the BRIR suitable for diffuse content as a selected first BRIR that is to be applied to diffuse audio, and select the BRIR suitable for direct content as a selected second BRIR that is to be applied to direct audio, perform a first binaural rendering process on the diffuse audio by applying the selected first BRIR and a first head related transfer function (HRTF) to the diffuse audio, perform a second binaural rendering process on the direct audio by applying the selected second BRIR and a second HRTF to the direct audio, and combining results of the first and second binaural rendering processes to produce a plurality of headphone driver signals that are to drive the headphones. - View Dependent Claims (19, 20, 21, 22)
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Specification