Acoustic Echo Removal via Sampling Frequency Conversion
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Solution Overview
Problem
Existing sound signal processing devices require matching sampling frequencies for echo removal processing, which can be undesirable when increasing the sampling frequency is not feasible, particularly for wireless communication of microphone signals.
Innovation Solution
A sound signal processing device that includes an acquisition section for collecting sound signals at a first sampling frequency, a frequency conversion section to convert reproduced-sound signals from a different second sampling frequency, and an echo removal section to remove acoustic echoes using the converted signals, allowing echo removal processing while maintaining a lower sampling frequency for the microphone signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sampling frequency of the microphone signal is increased to match the reproduced-sound signal for echo removal processing, then the echo removal processing can be performed, but the communication band required for wireless transmission and the amount of data processed increases
Solution Approach 1:
The patent changes the sampling frequency parameter of the reproduced-sound signal to match the microphone signal's sampling frequency. This allows echo removal processing to be performed without increasing the microphone signal's sampling frequency, thus maintaining low communication band requirements while enabling effective echo removal
Solution Approach 2:
The patent introduces a frequency conversion section as an intermediary component that converts the sampling frequency of the reproduced-sound signal. This intermediary allows the system to bridge the gap between different sampling frequencies without requiring the microphone signal to be upsampled, thereby solving the contradiction between echo removal capability and data transmission efficiency
Data Source
AI summary
A sound signal processing device that acquires a collected-sound signal obtained by sampling a sound collected by a microphone at a first sampling frequency, and receives a reproduced-sound signal obtained by sampling a sound for reproduction at a second sampling frequency different from the first sampling frequency, and then converts the sampling frequency of the reproduced-sound signal into the first sampling frequency so as to remove an acoustic echo from the collected-sound signal by using the reproduced-sound signal whose sampling frequency has been converted.