Method and device for transmitting and receiving signals in remote ANC system
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Solution Overview
Problem
Existing active noise control systems in vehicles face limitations due to low-performance controllers, which hinder effective noise cancellation and require computational resources that exceed the capabilities of onboard systems.
Innovation Solution
A remote ANC system is implemented, where a vehicle compresses multi-channel signals using ADPCM and transmits them to a server for processing, allowing the server to update adaptive filters and restore signals, thereby distributing computational tasks and improving noise control performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle controller performs all active noise control processing locally, then real-time noise cancellation can be achieved, but the controller performance requirements become excessively high and costly
Solution Approach 1:
The patent introduces a server as an intermediary component that handles complex computational tasks for adaptive filter updates. The vehicle controller communicates with this external server, which performs the intensive signal processing and returns updated filter coefficients. This mediator approach allows the vehicle to achieve high-performance noise control without requiring an overly complex or powerful onboard controller.
2Loss of information
If multi-channel signal data is transmitted without compression, then the server can process complete signal information, but the data transmission volume becomes excessively large
Solution Approach 1:
The patent applies ADPCM (Adaptive Differential Pulse Code Modulation) compression to transform the signal data parameters. Instead of transmitting raw multi-channel signal data at full resolution, the system compresses the data by exploiting temporal redundancy and adaptive quantization, significantly reducing the transmission volume while preserving the essential information needed for adaptive filter updates.
3Quantity of substance
If ADPCM compression is applied to multi-channel signals, then data transmission volume is reduced, but synchronization and restoration accuracy may be compromised
Solution Approach 1:
The patent implements a feedback mechanism where the vehicle controller transmits not only the compressed ADPCM data but also relevant status information and channel metadata to the server. The server uses this feedback information to accurately reconstruct and process the compressed signals, ensuring that the restoration accuracy is maintained despite the compression. The system continuously monitors and adjusts the compression parameters to preserve signal fidelity.
Data Source
AI summary
In a method and device for transmitting and receiving signals in a remote ANC system, the method for transmitting and receiving a multi-channel signal between a vehicle and a server in a remote active noise cancelling (ANC) system includes compressing, by the vehicle, a multi-channel signal including at least one reference signal, at least one noise control signal, and at least one error signal for each channel using adaptive differential pulse code modulation (ADPCM); constructing, by the vehicle, a packet including a signal compressed for each channel, corresponding channel information, and corresponding ADPCM status information, for each predetermined transmission unit; transmitting, by the vehicle, the constructed packet to a server; and restoring, by the server, the signal compressed for each channel based on the received packet.