Wireless Set-Top Box Echo Cancellation via Location Parameters
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Solution Overview
Problem
Wireless set-top boxes and display devices face challenges in echo cancellation and voice recognition due to the separation between the set-top box and display device, leading to signal delay and deteriorated performance.
Innovation Solution
A wireless set-top box equipped with a communication unit, microphone, and control unit that acquires and utilizes echo cancellation parameters based on location and direction information to perform echo cancellation and improve voice recognition by purifying voice data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the wireless set-top box and wireless display device are separated and communicate wirelessly, then the device flexibility and installation ease are improved, but signal transmission delay increases and echo cancellation performance deteriorates
Solution Approach 1:
The system performs preliminary calibration to measure the physical distance and signal transmission characteristics between the set-top box and display device before actual operation. This pre-measured data is stored and used to pre-calculate optimal echo cancellation parameters, compensating for the inherent delay in wireless separated architecture before voice recognition tasks begin.
Solution Approach 2:
The echo cancellation algorithm dynamically adjusts parameters such as delay compensation values, filter coefficients, and gain settings based on the measured transmission characteristics and real-time signal conditions. This allows the system to adapt to varying wireless transmission delays and maintain optimal echo cancellation performance despite the separated architecture.
2Adaptability or versatility
If the wireless set-top box is positioned away from the display device, then installation flexibility is improved, but voice recognition accuracy deteriorates due to increased delay
Solution Approach 1:
The system performs preliminary measurement of the transmission path characteristics including distance, delay, and signal attenuation during installation or initial setup. These pre-measured parameters are used to configure the echo cancellation algorithm optimally for the specific installation environment, ensuring accurate voice recognition regardless of the set-top box position.
Solution Approach 2:
The system continuously monitors the quality of voice signals received from the microphone, including metrics such as signal-to-noise ratio and echo residual levels. Based on this feedback, the echo cancellation algorithm dynamically adjusts its parameters to maintain optimal voice recognition accuracy, compensating for variations in transmission delay caused by different set-top box positions.
3Device complexity
If echo cancellation is performed without considering set-top box position, then processing simplicity is maintained, but echo cancellation performance deteriorates
Solution Approach 1:
The system performs a one-time preliminary calibration during installation to measure the physical distance and signal characteristics between the set-top box and display device. This pre-measured baseline data is stored and used to initialize the echo cancellation algorithm, providing accurate position-based parameters without requiring complex real-time calculations during normal operation.
Solution Approach 2:
The echo cancellation algorithm uses the pre-measured position data to set initial parameters such as delay compensation values and filter lengths. During operation, these parameters are dynamically adjusted based on real-time signal conditions while maintaining the position-based foundation, achieving high performance without excessive computational complexity.
Data Source
AI summary
Disclosed is a wireless display system comprising a wireless set-top box for communicating with a wireless display device and performing voice recognition, the wireless set-top box comprising: a communication unit that transmits image data and sound data to the wireless display device; a microphone that receives a voice command of a user; and a control unit that, when the voice command of the user is received, obtains an echo removal parameter on the basis of location information of the wireless set-top box and performs echo removal by using the echo removal parameter.