Echo Cancellation Using Amplifier Feedback Reference Signals
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Solution Overview
Problem
The precision of the reference signal in echo canceling techniques significantly affects the quality of echo cancellation and sound acquisition, necessitating an enhancement to improve echo cancellation performance.
Innovation Solution
An audio processing apparatus and method that utilizes a signal processed by a power amplification circuit of a playback device as a reference signal in an echo canceling algorithm, incorporating a digital-to-analog conversion (DAC) circuit, an analog-to-digital conversion (ADC) circuit, and a processor to perform echo cancellation, thereby enhancing the precision of the feedback mechanism and improving echo cancellation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional reference signal is used for echo cancellation, then the echo canceling mechanism can operate, but the precision of the reference signal is insufficient, leading to poor echo cancellation quality
Solution Approach 1:
The patent creates a copy of the playback signal through the power amplification circuit and ADC conversion to generate a reference signal that accurately replicates the actual playback voice characteristics. This copied reference signal includes the echo path effects, making it highly similar to the actual echo in the received audio signal, thereby significantly improving echo cancellation precision
Solution Approach 2:
The patent implements a feedback mechanism where the output signal from the power amplification circuit is fed back through the ADC circuit to generate a reference signal. This feedback loop ensures that the reference signal continuously reflects the actual playback conditions, including any distortions or characteristics introduced by the power amplification circuit, thereby improving the reliability of echo cancellation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in better echo cancellation effects by using a reference signal that is similar to the playback voice, allowing for more effective removal of echo components from received audio signals, thereby improving the overall quality of sound acquisition.
Implementation Method 1
The DAC circuit is configured to perform digital-to-analog conversion according to the input digital audio signal to generate an output analog audio signal
Implementation Method 2
The power amplification circuit performs power amplification on the output analog audio signal to generate an amplified signal
Implementation Method 3
the loudspeaker plays the amplified signal to generate a playback voice
Implementation Method 4
The ADC circuit is configured to perform analog-to-digital conversion on the amplified signal generated by the power amplification circuit to generate an amplified digital signal
Data Source
AI summary
An audio processing apparatus having an echo canceling mechanism is provided. An audio transmission circuit receives an input digital audio signal from an external device. A DAC circuit performs conversion according to the input digital audio signal to generate an output analog audio signal to an external display device for power amplification and playback. An ADC circuit performs analog-to-digital conversion on an amplified signal generated by a power amplification circuit and a received audio signal generated by an audio receiving device to generate an amplified digital signal and a received digital audio signal. A processor implements an echo canceling algorithm to perform echo cancellation according to the amplified digital signal and the received digital audio signal to generate an output digital audio signal to be transmitted to the external device through the audio transmission circuit.