Audio Signal Format Switching for M/S Codec Compatibility
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Solution Overview
Problem
Existing encoding methods, such as M/S stereo encoding, can impair encoding performance when dealing with M/S format signals from M-S microphones, as they may not be compatible with existing codecs like EVS, leading to uncomfortable user experiences and inefficient signal conversion.
Innovation Solution
An encoding and decoding apparatus that dynamically converts sound signal formats based on the capabilities of the decoding apparatus, allowing for appropriate encoding and decoding of M/S format signals by determining the signal format to be used, either converting to L/R format if supported or maintaining M/S format, thereby ensuring compatibility and optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If M/S stereo encoding is applied to M/S format signals from M-S microphones, then encoding performance deteriorates and user experience becomes uncomfortable, but converting to L/R format may be incompatible with existing codecs
Solution Approach 1:
The encoding apparatus dynamically switches between M/S format and L/R format encoding based on the capabilities of the decoding apparatus. The control circuitry determines whether to apply M/S stereo encoding or convert to L/R format by checking if the decoding apparatus supports M/S format, thereby adapting the encoding method to the specific situation rather than using a fixed approach
Solution Approach 2:
The system changes the signal format parameter from M/S format to L/R format based on the decoding capability information. When the decoding apparatus does not support M/S format, the control circuitry converts the signal format parameter, allowing existing codecs to process the signal correctly without compatibility issues
2Adaptability or versatility
If signal format conversion is performed based on decoding apparatus capability, then codec compatibility is improved, but system complexity increases
Solution Approach 1:
The system performs preliminary determination of the decoding apparatus's M/S format support capability before encoding. The control circuitry checks the decoding capability in advance and decides the encoding method beforehand, avoiding the need for complex real-time adjustments during the encoding process itself
Solution Approach 2:
The control circuitry acts as an intermediary between the encoding circuitry and the decoding apparatus. It receives capability information from the decoding apparatus, processes this information to determine the appropriate encoding method, and then controls the encoding circuitry accordingly, simplifying the overall system architecture
Data Source
AI summary
This encoding device is provided with a control circuit that, on the basis of information relating to the capability to convert the signal form of a sound signal in a decoding device for decoding encoded data of the sound signal, controls the conversion of the signal form of the sound signal, and an encoding circuit that encodes the sound signal in accordance to the conversion control.