Binaural rendering using subband filters

Abstract

Transfer functions like Head Related Transfer Functions (HRTF) needed for binaural rendering are implemented efficiently by a subband-domain filter structure. In one implementation, amplitude, fractional-sample delay and phase-correction filters are arranged in cascade with one another and applied to subband signals that represent spectral content of an audio signal in frequency subbands. Other filter structures are also disclosed. These filter structures may be used advantageously in a variety of signal processing applications. A few examples of audio applications include signal bandwidth compression, loudness equalization, room acoustics correction and assisted listening for individuals with hearing impairments.

Description

technical field [0001] The present invention relates generally to signal processing, and more particularly to signal processing that provides accurate and efficient implementation of transfer functions. Background technique [0002] Typical signal processing techniques for implementing transfer functions often use computationally intensive high-order filters. Stereo rendering techniques are examples of applications where transfer functions are typically applied to synthesize the auditory effects of many audio sources in a sound field using only two channels. Stereophonic rendering techniques produce a two-channel output signal with spatial cues derived from one or more input signals, each of which is associated with a position specific to a listener position. The resulting two-channel output signal, when played back on suitable equipment such as headphones or speakers, is intended to convey the same aural image of the sound field produced by the input sound signal originati...

AI Technical Summary

Problems solved by technology

The length of the impulse response used to render the HRTF directly affects the computational complexity of the processing required to implement the filter

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