Audio Signal Morphing via Parallel FIR and IIR Processing
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Solution Overview
Problem
Existing morphing devices for audio signal processing in vehicles require high computing processor power and memory, making them inefficient and in need of improvement for better performance.
Innovation Solution
A method that uses a parallel signal processing approach with an FIR filter device and a signal processing device, such as an amplification or IIR filter device, to change FIR coefficients during a morphing process, creating an alternative signal path that reduces computational load and memory requirements, while ensuring the process is imperceptible to listeners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a known morphing device is used to change output parameters of audio signals, then the morphing process can be carried out, but the computing processor power and memory requirements are comparatively high
Solution Approach 1:
The audio signal processing is divided into two separate devices: a FIR filter device and a signal processing device (amplifier or IIR filter). This segmentation allows the computationally intensive FIR filtering to be performed only when needed, while the signal processing device handles amplification or IIR filtering, reducing the overall computing processor power requirements for morphing operations.
Solution Approach 2:
The patent extracts the FIR filtering function from the main signal processing path and implements it as a separate parallel device. This extraction allows the system to use less computationally demanding operations (amplification or IIR filtering) for the majority of signal processing, reserving the intensive FIR processing only for specific morphing operations.
2Reliability
If a known morphing device is used to change output parameters of audio signals, then the morphing process can be carried out, but the memory requirement is comparatively high
Solution Approach 1:
By dividing the audio processing into separate FIR filter device and signal processing device, the memory requirements are distributed and optimized for each device's specific function, reducing the total memory requirement compared to a single comprehensive morphing device.
Solution Approach 2:
The FIR filtering component is extracted as a separate device with its own dedicated memory, allowing the main signal processing device to use less memory. This extraction enables more efficient memory utilization by allocating memory resources according to the specific needs of each processing function.
3Adaptability or versatility
If the audio signal supply is changed from FIR filter device to signal processing device, then the output settings can be changed, but acoustic interference may occur
Solution Approach 1:
The system performs preliminary actions by gradually transitioning the audio signal supply from the FIR filter device to the signal processing device over a period of time. This gradual transition, rather than an abrupt switch, prevents acoustic interference by allowing the listener's auditory system to adapt to the changing signal characteristics.
Solution Approach 2:
The audio signal supply is dynamically adjusted over time, transitioning from the FIR filter device to the signal processing device. This dynamic approach allows the system to adapt the signal path based on the current state, ensuring smooth changes in output settings without generating perceptible acoustic interference.
Data Source
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AI summary
Method for carrying out a morphing process, wherein an output parameter relating to the output of an audio signal output into an interior (10) via an audio output device (3) is changed, comprising the following steps of: - supplying an audio signal provided by an audio signal source device (6) to an audio mixing device (4) via an FIR filter device (5) comprising a plurality of FIR coefficients, wherein 100% of the audio signal is supplied to the audio mixing device (4) via the FIR filter device (5), - applying a first transfer function, according to which the supply of the audio signal via the FIR filter device (5) is gradually reduced from 100% to 0% and the supply of the audio signal via a signal processing device (7) connected in parallel with the FIR filter device (5) is conversely gradually increased from 0% to 100%, - changing at least some of the FIR coefficients of the FIR filter device (5) while supplying the audio signal via the signal processing device (7), - applying a second transfer function, according to which the supply of the audio signal via the signal processing device (7) is gradually reduced from 100% to 0% and the supply of the audio signal via the FIR filter device (5) is conversely gradually increased from 0% to 100%, wherein the audio signal is supplied via the FIR filter device (5) on the basis of the changed FIR coefficients of the FIR filter device (5).