Audio Switching Device Varying Mixing Ratio for Smooth Band Transition
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Solution Overview
Problem
Conventional speech switching apparatuses experience disagreeable sensations or fluctuations in signal quality due to fixed mixing ratio changes, particularly when switching between narrow-band and wide-band decoded speech signals, especially in scenarios with constant background noise.
Innovation Solution
A speech switching apparatus that dynamically adjusts the mixing ratio of narrow-band and wide-band speech signals over time using a configuration with a mixing section and a setting section, allowing for variable degree changes, particularly in permissible intervals detected by power, silence, and sound quality change intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed degree of change in mixing ratio is used for weighted addition of narrow-band and wide-band signals, then the switching process is simple to implement, but the listener experiences disagreeable sensations and fluctuations in signal quality
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed mixing ratio change approach to a variable mixing ratio change approach. The degree of change in mixing ratio is dynamically adjusted based on the detection result of permissible intervals, allowing the system to adapt to different signal conditions and eliminate disagreeable sensations while maintaining implementation feasibility.
Solution Approach 2:
The patent changes the parameter of mixing ratio degree from a constant value to a variable value that depends on detected intervals. By modifying this parameter based on signal characteristics, the system achieves smoother transitions and improved signal quality stability without significantly increasing complexity.
2Speed
If frequent speech switching is performed in intervals with constant background noise, then the responsiveness of the system is improved, but the listener senses variation in power and band sensation
Solution Approach 1:
The patent applies local quality by differentiating between different time intervals and applying different mixing ratio change strategies. In permissible intervals (where rapid change is acceptable), the degree of change is increased for faster switching. In non-permissible intervals (with constant background noise), the degree of change is reduced to avoid perceptible variations, thus achieving context-dependent optimization.
Solution Approach 2:
The system dynamically adjusts the degree of mixing ratio change based on real-time detection of permissible intervals. This dynamic adaptation allows rapid switching when appropriate while preventing perceptible fluctuations during sensitive periods, resolving the contradiction between switching speed and perceived stability.
3Device complexity
If the mixing ratio changes at a constant rate, then the control mechanism is simple, but the smoothness of switching between narrow-band and wide-band signals is insufficient under certain conditions
Solution Approach 1:
The patent changes the control parameter from a constant mixing ratio change rate to a variable rate that adapts to signal conditions. By detecting permissible intervals and adjusting the degree of change accordingly, the system achieves smoother transitions without requiring complex control mechanisms, balancing simplicity and performance.
Data Source
AI summary
There is disclosed a speech switching device capable of improving quality of a decoded signal. In the device, a weighted addition unit outputs a mixed signal of a narrow-band speech signal and a wide-band speech signal when switching the speech signal band. A mixing unit formed by an extended layer decoded speech amplifier and an adder mixes the narrow-band speech signal with the wide-band speech signal while changing the mixing ratio of the narrow-band speech signal and the wide-band speech signal as the time elapses, thereby obtaining a mixed signal. An extended layer decoded speech gain controller variably sets the degree of change of the mixing ratio by the time.