Patent ID: 11871176
Assignee: TENCENT TECHNOLOGY (SHENZHEN) COMPANY LIMITED
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A far-field pickup device, comprising:
a device body; and
a microphone configured to collect user speech and an echo of a first sound signal output by the device body, and the microphone further configured to transmit, to the device body, the collected user speech and the echo,
the device body comprising:
a signal playback source configured to generate a second sound signal, the second sound signal having a frequency in a first frequency band;
a synchronizing signal processor, implemented by at least one processor, configured to generate a synchronizing signal that is synchronized with the second sound signal, the synchronizing signal having a frequency in a second frequency band, wherein the second frequency band is different from the first frequency band;
a speaker configured to output a signal obtained by superimposing the second sound signal with the synchronizing signal, the signal output by the speaker corresponding to the first sound signal;
a delay determining processor, implemented by the at least one processor, configured to determine a time delay between a second frequency band component in the collected user speech and the echo and the synchronizing signal; and
an echo cancellation processor, implemented by the at least one processor, configured to obtain a collected human voice signal by performing echo cancellation on the collected user speech and the echo using a delayed second sound signal.