Audio Signal Morphing via FIR Crossfade to Cut Processor Load
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Solution Overview
Problem
Existing morphing devices for audio signal processing in vehicles require high computational processor power and storage, leading to inefficient use and potential for improvement.
Innovation Solution
A method involving an FIR filter device and a signal processing device, where the audio signal is gradually transferred between them using transfer functions, allowing for changes in FIR coefficients to optimize processor use and reduce acoustic interference, thereby enabling efficient morphing processes that are imperceptible to listeners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a known morphing device is used to change output parameters of an audio signal, then the morphing process can be carried out, but the computational processor power and storage requirements are comparatively high
Solution Approach 1:
The audio signal processing is segmented into two separate devices: a first device (e.g., FIR filter) and a second device (e.g., IIR filter or amplification device). Each device handles a portion of the signal processing, allowing the computationally intensive morphing operations to be distributed. This segmentation reduces the computational burden on any single processor while maintaining the overall morphing capability.
Solution Approach 2:
An audio mixing device acts as an intermediary between the first and second signal processing devices. The mixing device combines the outputs of both devices, allowing gradual transition between different audio signal paths. This intermediary enables smooth morphing by blending signals from both processing paths, reducing the need for high computational power in any single device.
2Reliability
If a known morphing device is used to change output parameters of an audio signal, then the morphing process can be carried out, but the storage requirements are comparatively high
Solution Approach 1:
The storage requirements are segmented across multiple devices. The first signal processing device stores its own set of parameters and filter coefficients, while the second device stores its own separate parameters. This distributed storage approach reduces the storage burden on any single device compared to a centralized morphing device that would need to store all parameters simultaneously.
Solution Approach 2:
The audio mixing device serves as an intermediary that dynamically combines outputs from both processing devices based on transfer functions. This allows the system to achieve morphing effects without storing complete morphing parameter sets in one location, as the mixing device generates the transition effects in real-time based on inputs from both segmented processing paths.
3Productivity
If the audio signal is rapidly transferred between signal processing devices, then the morphing process is faster, but acoustic interference becomes perceptible to listeners
Solution Approach 1:
The transfer function between the two signal processing devices is dynamically adjusted over time. Rather than an abrupt switch, the transfer function gradually transitions, allowing the audio signal to smoothly move from one processing path to another. This dynamic adjustment ensures that the morphing process completes at an appropriate speed while maintaining acoustic quality and avoiding perceptible interference.
Solution Approach 2:
The audio mixing device monitors the combined output from both signal processing devices and adjusts the mixing ratio based on transfer function parameters. This feedback mechanism ensures that during the morphing transition, the acoustic output remains smooth and free of perceptible interference, while still achieving the desired morphing effect within an acceptable time frame.
Data Source
AI summary
Method for carrying out a morphing process, wherein an output parameter relating to the output of an audio signal outputted into an interior via an audio output device is changed.