Echo cancellation method and device
An echo cancellation, right channel technology, applied in the field of vehicles, can solve the problems of I2S resource shortage and difficulty in ensuring I2S data synchronization.
Pending Publication Date: 2020-11-03
广州易点智慧出行科技有限公司
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[0004] Among them, in the solution of implementing the elimination algorithm by software, the uplink signal and the reference signal need to be directly transmitted to the SoC (System on Chip, system-level chip, equivalent to a micro small system) to process the AEC algorithm, but in some SoCs with limited system resources, the I2S resources are also relatively tight, and because the two I2S data (ie, the uplink signal and the reference signal) are transmitted to the SoC system through two I2S buses Algorithm processing, it is difficult to ensure the synchronization of two I2S data
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[0056] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0057] In usage scenarios with uplink and downlink audio data streams, since the pickup system is often interfered by music and background noise, what the microphone receives includes not only the user’s voice signal but also music and background noise. The music here can be called Call it an echo.
[0058] In practical applications, since the echo cancellation is not clean, the data obtained after speech recognition using the speech recognition engine may include echo signals. For example, in the following scenario, the vehicle-mounted system sends out the voice "A call is coming, do you want to answer it, or reject it?" At this time, due to the unclean echo cancellation, "answer" and / or "reject" may be picked up through the acou...
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The embodiment of the invention provides an echo cancellation method and device, and the method comprises the steps: obtaining an uplink signal and a reference signal, transmitting the uplink signal to a data merging module through an uplink signal input interface, and transmitting the reference signal to the data merging module through a reference signal input interface; merging the uplink data left channel and the reference data left channel through a data merging module to obtain target left channel data, and merging the uplink data right channel and the reference data right channel to obtain target right channel data; and transmitting the target left channel data and the target right channel data to a processing system through a single-channel audio bus, so as to enable the processingsystem to perform echo cancellation processing. Transmission of four-channel data including uplink signals and reference signals is achieved through a single-channel audio bus, and it is guaranteed that transmission of the channel data is achieved under the condition that I2S resources are limited.
Description
technical field [0001] The invention relates to the technical field of vehicles, in particular to an echo cancellation method and an echo cancellation device. Background technique [0002] In the multimedia field, the Acoustic Echo Cancellation (AEC) system has been widely used, and it is mainly used in usage scenarios with uplink and downlink audio data streams, such as terminal calls, voice recognition, multi-microphone array smart speakers, etc. In the above scenario, the sound pickup system is often disturbed by music and background noise, which makes it difficult for the user's voice to be captured by the system. This is because what the microphone receives can include not only the user's voice signal, but also music and background Noise, the music here is called an echo, and the path through which music and background noise are transmitted to the microphone is called an acoustic path. [0003] At this time, the AEC system can be used to eliminate the echo received by ...
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IPC IPC(8): G10L21/0208
CPCG10L21/0208G10L2021/02082
Inventor 谢芳
Owner 广州易点智慧出行科技有限公司