Audio Processing Unit Dynamic Directivity Control
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Solution Overview
Problem
Existing audio processing units are limited in their ability to adjust the directional characteristic of microphones effectively, particularly in responding to changes in audio signal amplitude and frequency.
Innovation Solution
An audio processing unit with first and second inputs for symmetrically structured microphone capsules, featuring filter and delay units, a control unit that adjusts filter parameters and delay times based on audio signal amplitude, and a voltage-controlled directing unit to dynamically adjust the directivity factor, allowing switching between cardioid, figure-of-eight, supercardioid, omnidirectional, and wide cardioid directional characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the directional characteristic of the microphone is adjusted by influencing the output signals of the microphone capsules, then the directional characteristic can be changed, but the system cannot respond dynamically to changes in audio signal amplitude and frequency
Solution Approach 1:
The patent implements dynamic adjustment of filter parameters and delay times based on the amplitude and frequency of the audio signal. The control unit continuously monitors the signal characteristics and automatically modifies the processing parameters, enabling the microphone system to adapt its directional characteristic in real-time according to the acoustic environment.
Solution Approach 2:
The control unit receives feedback from the audio signal amplitude and frequency detection, and uses this information to adjust the filter and delay unit parameters. This closed-loop control mechanism enables automatic adaptation of the directional characteristic without manual intervention.
2Measurement precision
If multiple filter units and delay units are used to control directional characteristics, then precise control is achieved, but the device complexity increases
Solution Approach 1:
The patent divides the audio processing function into separate filter units and delay units, each handling specific aspects of signal processing. This segmentation allows independent optimization of each unit while maintaining overall system precision for directional characteristic control.
Solution Approach 2:
The filter units and delay units are designed to work together in a unified control system that can achieve multiple directional characteristics (cardioid, figure-of-eight, supercardioid, omnidirectional, wide cardioid) through coordinated operation, reducing the need for separate hardware for each mode.
Data Source
AI summary
An audio processing unit having a first and second input for receiving output signals of a microphone with a first and a second physically symmetrically structured microphone capsule. The audio processing unit further has a first filter unit and a first delay unit which is coupled to the first input, and a second filter unit and a second delay unit which is coupled to the second input. The audio processing unit further has an adding unit for adding signals from the first and second filter units and a control unit for influencing the filter parameters of the first and second filters and/or the delay times of the first and second delay units depending on an amplitude of an audio signal received via the first and/or second input. A directivity factor of the output signal of the microphone is controlled depending on the amplitude of the output signal of the microphone.