Method and apparatus for processing audio signal based on equalization filter

A technology for equalizing filters and audio signals, applied in instruments, sounding devices, frequency response correction, etc.

Active Publication Date: 2021-06-11
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, naturalness can be affected by wearing acoustically closed-back headphones, especially in-ear headphones, which have a strong occlusion effect

Method used

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  • Method and apparatus for processing audio signal based on equalization filter
  • Method and apparatus for processing audio signal based on equalization filter
  • Method and apparatus for processing audio signal based on equalization filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] Example 1, Phone with headset (in-ear headset or earbuds with in-line microphone) in a quiet environment.

[0109] Figure 10 A block diagram of this embodiment is shown. The user's own voice (transmitted through the air) is captured using the embedded microphone of the headset used. The captured speech signal 13 is filtered by a pair of mouth-to-ear transfer functions (HmeTF), which may or may not be determined before 14 separately. The filtered speech signal is then further filtered through a pair of anti-blocking pass-through equalization filters to enhance the high-pass component of the user's own voice. Headphones are then used to play the filtered signal to the user and enhance the naturalness of the user's speech.

[0110] The anti-occlusion direct equalization filter 12 is pre-designed based on the acoustic impedance of the earphone. Therefore, information on the headphones used is required. This operation can be done manually or automatically. For example...

Embodiment 2

[0117] Example 2, phone with headset (in-ear headset or earbuds with in-line microphone) in a noisy environment.

[0118] For example, a user is conducting a conference call with a headset in a noisy space (eg, in a restaurant or an airport). The user's own voice, captured by the built-in microphone, is combined with ambient noise, which can reduce the sense of naturalness. Additionally, users do not want the remote user to hear ambient noise, as this reduces speech intelligibility.

[0119] Therefore, in the case of a noisy environment, the captured user voice is first decomposed into direct sound and ambient sound. Ambient sounds are discarded. The extracted direct sound is filtered through a pair of HmeTFs and further filtered through a pair of anti-occlusion pass-through equalization filters to simulate the direct sound part. Add a measured or synthesized late reverb section to the direct section to simulate a fairly quiet environment but with local spatial information....

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PUM

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Abstract

The invention relates to a method for processing an audio signal, the method comprising: processing the audio signal according to a pair of mouth to ear transfer functions, to obtain a processed audio signal; filtering the processed audio signal, using a pair of equalization filters, to obtain a filtered audio signal, wherein a parameter of the equalization filter is depends on an acoustic impedance of a headphone; and outputting the filtered audio signal to the headphone. The method counteracts the occlusion effect and provides a natural perceived sound pressure.

Description

technical field [0001] The invention relates to the field of audio signal processing and reproduction. More specifically, the present invention relates to a method for processing an audio signal using an equalization filter, and an apparatus for processing an audio signal based on an equalization filter. The invention also relates to a computer-readable storage medium. Background technique [0002] Headphones are a pair of small speaker drivers worn over or around the user's ears. Headphones are electroacoustic transducers that convert electrical signals into corresponding sounds. Headphones allow a single user to listen to an audio source privately, in contrast to speakers, which emit sound outdoors for anyone nearby to hear. Headphones are also known as ear speakers or earphones. Circa-aural (“around the ear”) and supra-aural (“over the ear”) headphones use a strap above the head to hold the speaker in place. Another type, called an eartip or earpiece, consists of ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/04
CPCH04R3/04H04R2460/05G10K11/002H04R1/1083
Inventor 庞立昀丰斯·阿德里安森罗曼·施利珀李松
Owner HUAWEI TECH CO LTD
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