Echo Cancellation in Multi-Speaker Devices Using Frequency Segmentation
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Solution Overview
Problem
Electronic devices face challenges in canceling echo phenomena when providing audio services, especially with increasing numbers of speakers and microphones, as existing methods struggle to effectively attenuate output audio signal components from multiple speakers.
Innovation Solution
The implementation of an electronic device with multiple speakers and microphones, where a processor configures each speaker to output specific frequency bands and applies filters to input signals from microphones to isolate and attenuate echo components, allowing for the creation of a transmission audio signal that cancels echo by mixing partial audio signals from multiple microphones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple speakers are installed to provide louder sound volume and three-dimensional sound, then audio service quality is improved, but echo phenomenon becomes more difficult to cancel
Solution Approach 1:
The audio signal is divided into multiple frequency bands, with each speaker responsible for specific frequency ranges. The echo cancellation system is segmented to process each frequency band separately, allowing precise identification and cancellation of echo components from individual speakers while preserving the enhanced audio quality provided by multiple speakers.
Solution Approach 2:
Different frequency bands are assigned to different speakers based on their spatial locations and characteristics. The echo cancellation applies localized processing to each speaker's output, using microphones positioned adjacent to specific speakers to cancel echo from those particular speakers while maintaining overall audio service quality.
2Measurement precision
If multiple microphones are used to detect user voice accurately, then voice detection accuracy is improved, but difficulty to identify and cancel output audio signal components increases
Solution Approach 1:
The echo cancellation system segments the audio signal processing by frequency bands and speaker sources. Each microphone's input is processed to identify echo components from specific speakers operating in specific frequency ranges, making the detection and cancellation of output audio signal components more manageable despite having multiple microphones.
Solution Approach 2:
Filter units act as intermediaries between the microphones and the echo cancellation processing. These filters selectively pass specific frequency bands to corresponding echo cancellation units, facilitating the identification and cancellation of echo components from individual speakers while preserving accurate voice detection capabilities.
Data Source
AI summary
A method for canceling an echo and an electronic device thereof are provided. The electronic device includes a housing, a communication module, a first speaker disposed in a first region of the housing, a second speaker disposed in a second region of the housing, a first microphone disposed adjacent to the first region, a second microphone disposed adjacent to the second region, and a processor. The processor is configured to receive a first audio signal from an external electronic device, and output a first given frequency band, and output a second given frequency band, and provide a first signal by applying a filter capable of passing a band corresponding to the second given frequency band, and provide a second signal by applying a filter capable of passing a band corresponding to the first given frequency band, and provide a second audio signal corresponding to the external audio signal, and transmit the second audio signal to the external electronic device.