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Apparatus and method for producing 3d audio in systems with closely spaced speakers

A sound and left audio technology, applied in the field of audio signal processing, can solve problems such as the difficulty of reconstructing spatial audio, achieve the effects of reducing sensitivity, good sound transmission, and achieving scalability and efficiency

Inactive Publication Date: 2011-04-06
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recreating spatial audio is particularly difficult for such devices due to their limited processing power and their close speaker spacing

Method used

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  • Apparatus and method for producing 3d audio in systems with closely spaced speakers
  • Apparatus and method for producing 3d audio in systems with closely spaced speakers
  • Apparatus and method for producing 3d audio in systems with closely spaced speakers

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Embodiment Construction

[0056] image 3 is a simplified schematic diagram of the audio processing circuit 30 including the acoustic crosstalk cancellation block 32 . By offering advantages in terms of power consumption and computational resource requirements, the crosstalk cancellation block 32 includes a number of implementation simplifications that complement its ability to operate with closely spaced speakers 34R and 34L (e.g. the angular span from the listener to both speakers should be 10 degree or less) audio equipment. In particular, the crosstalk cancellation block 32 provides for input digital audio signal B based on a small number of configurable attenuation and delay parameters. R and B L crosstalk cancellation processing. Setting these parameters to specific values ​​tunes the crosstalk cancellation performance for specific characteristics of the loudspeakers 34R and 34L.

[0057] In one or more embodiments, these parameter values ​​are freely configurable, such as by software program ...

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Abstract

An audio processing circuit includes a crosstalk cancellation circuit that is advantageously simplified for use in audio devices that have closely-spaced speakers. In particular, crosstalk filtering as implemented in the circuit assumes that the external head-related contralateral filters are time-delayed and attenuated versions of the external, head-related ipsilateral filters. With this assumption, the circuit's crosstalk filtering is configurable for varying audio characteristics, according to a small number of settable parameters. These parameters include configurable first and second attenuation parameters for cross-path signal attenuation, and configurable first and second delay parameters for cross-path delay. Optional sound normalization, if included, uses similar simplified parameterization. Further, in one or more embodiments, the audio processing circuit and method include or are associated with a defined table of parameters that are least-squares optimized solutions. The optimized parameter values provide wider listening sweet spots for a greater variety of listeners.

Description

technical field [0001] The present invention relates generally to audio signal processing, and in particular to audio signal processing for delivering 3D audio (eg, binaural audio) to a listener through an audio device with closely spaced speakers. Background technique [0002] A binaural audio signal is a stereo signal composed of left and right signals reaching the listener's left and right eardrums in a real or virtual 3D environment. Streaming or playing a binaural signal through a good pair of headphones enables the listener to experience the immersive feeling of being in a real or virtual environment, because the binaural signal contains all the spatial cues that build up that feeling. ). [0003] In a real environment, binaural signals are recorded using small microphones placed in the ear canals of real people or artificial heads constructed to be acoustically equivalent to ordinary human heads. One application of streaming or playing such a binaural signal to anot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04S1/00H04S7/00
CPCH04S7/30H04S2420/01H04S1/00H04R2499/11
Inventor E·卡尔森P·桑德格伦
Owner TELEFON AB LM ERICSSON (PUBL)
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