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US 10,542,152 B2Granted
Echo time delay detection method, echo elimination chip, and terminal equipment
AssigneeTencent Technology (Shenzhen) Company Limited
InventorJun Bin Liang
Life of this patent
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Abstract
An echo time delay detection method, an echo elimination device, and terminal equipment are provided. The echo time delay detection method includes: obtaining an audio signal transmitted through air and acquired by an audio input device of terminal equipment when detecting a call access request, the audio signal corresponding to an audio output by an audio output device of the terminal equipment; converting the audio signal to obtain a signal to be processed; determining a reference signal corresponding to the audio signal; and determining an echo time delay value according to the reference signal and the signal to be processed.
Claims21
An echo time delay detection method, comprising:
- obtaining an audio signal transmitted through air and acquired by an audio input device of terminal equipment when detecting a call access request, the audio signal corresponding to an audio output by an audio output device of the terminal equipment;
- converting the audio signal to obtain a signal to be processed;
- determining a reference signal corresponding to the audio signal;
- determining a binary array, comprising binary values of all frequency bins, of each frame of the reference signal and a binary array, comprising binary values of all frequency bins, of each frame of the signal to be processed;
- and
- determining a first echo time delay value based on binary arrays of respective frames of the reference signal and the signal to be processed,
- wherein the determining the binary array of each frame of the reference signal comprises:
- respectively performing fast fourier transform (fft) of 2M frequency bins on each frame of the reference signal, to obtain a fft processing result of all frequency bins of each frame of the reference signal, wherein M is a set value;
- making j a frequency bin number, and respectively calculating a power spectrum of a jth frequency bin of each frame of the reference signal according to the fft processing result of all frequency bins of each frame of the reference signal;
- and
- for each frame of the reference signal, setting a value for the jth frequency bin in response to the power spectrum of the jth frequency bin, to obtain binary values corresponding to all frequency bins, to construct a binary array corresponding to each frame of the reference signal.
8 more elements
An echo elimination device, comprising:
- at least one memory operable to store program code;
- and
- at least one processor operable to read the program code, and operate as instructed by the program code, the program code comprising:
- obtaining code configured to cause the at least one processor to obtain an audio signal transmitted through air and acquired by an audio input device of terminal equipment when detecting a call access request, the audio signal corresponding to an audio output by an audio output device of the terminal equipment;
- conversion code configured to cause the at least one processor to convert the audio signal to obtain a signal to be processed;
- first determination code configured to cause the at least one processor to determine a reference signal corresponding to the audio signal;
- second determination code configured to cause the at least one processor to determine a binary array, comprising binary values of all frequency bins, of each frame of the reference signal and a binary array, comprising binary values of all frequency bins, of each frame of the signal to be processed;
- and
- third determination code configured to cause the at least one processor to determine a first echo time delay value based on binary arrays of respective frames of the reference signal and the signal to be processed,
- wherein the second determination code causes the at least one processor to determine the binary array of each frame of the reference signal by:
- respectively performing fast fourier transform (fft) of 2M frequency bins on each frame of the reference signal, to obtain a fft processing result of all frequency bins of each frame of the reference signal, wherein M is a set value;
- making j a frequency bin number, and respectively calculating a power spectrum of a jth frequency bin of each frame of the reference signal according to the fft processing result of all frequency bins of each frame of the reference signal;
- and
- for each frame of the reference signal, setting a value for the jth frequency bin in response to the power spectrum of the jth frequency bin, to obtain binary values corresponding to all frequency bins, to construct a binary array corresponding to each frame of the reference signal.
11 more elements
A non-transitory computer-readable storage medium having stored therein a computer readable code executable by a processor to perform:
- obtaining an audio signal transmitted through air and acquired by an audio input device of terminal equipment when detecting a call access request, the audio signal corresponding to an audio output by an audio output device of the terminal equipment;
- converting the audio signal to obtain a signal to be processed;
- determining a reference signal corresponding to the audio signal;
- determining a binary array, comprising binary values of all frequency bins, of each frame of the reference signal and a binary array, comprising binary values of all frequency bins, of each frame of the signal to be processed;
- and
- determining a first echo time delay value based on binary arrays of respective frames of the reference signal and the signal to be processed,
- wherein the determining the binary array of each frame of the reference signal comprises:
- respectively performing fast fourier transform (fft) of 2M frequency bins on each frame of the reference signal, to obtain a fft processing result of all frequency bins of each frame of the reference signal, wherein M is a set value;
- making j a frequency bin number, and respectively calculating a power spectrum of a jth frequency bin of each frame of the reference signal according to the fft processing result of all frequency bins of each frame of the reference signal;
- and
- for each frame of the reference signal, setting a value for the jth frequency bin in response to the power spectrum of the jth frequency bin, to obtain binary values corresponding to all frequency bins, to construct a binary array corresponding to each frame of the reference signal.
8 more elements
Dependencies are inferred from the claim text.