Reduced-Memory Ultrasonic Activity Templates via Downsampling
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Solution Overview
Problem
Existing systems face challenges in efficiently storing and retrieving playback signals due to memory size limitations, often requiring hardware modulators or additional processing to recreate desired signals accurately.
Innovation Solution
A method and system that generate a reduced-memory template signal by demodulating and downsampling an original signal, storing it in memory, and upsampling for playback, while determining conditions to either retrieve from memory or synthesize the signal based on available resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the original signal is stored directly in memory, then signal accuracy is maintained, but memory size requirements increase significantly
Solution Approach 1:
The patent extracts only the essential characteristics of the original signal by demodulating it to a lower frequency and downsampling to reduce the data rate. This creates a template signal that contains the core information needed for playback while occupying minimal memory space, rather than storing the complete high-frequency original signal
Solution Approach 2:
The patent transforms the signal parameters by changing its frequency domain characteristics through demodulation and altering its time-domain sampling rate through downsampling. These parameter changes enable the signal to be stored efficiently in memory while still allowing accurate reconstruction through reverse operations (upsampling and remodulation)
2Measurement precision
If hardware modulators are used to recreate signals accurately, then signal fidelity improves, but device complexity increases
Solution Approach 1:
The patent replaces hardware modulators with software-based signal processing operations. The template signal is reconstructed by performing digital upsampling and remodulation through software algorithms, eliminating the need for dedicated hardware modulator circuits while maintaining signal accuracy
Solution Approach 2:
The patent creates a simplified copy of the original signal in the form of a downsampled template that captures the essential signal characteristics. This template copy is stored in memory and can be quickly retrieved and reconstructed when needed, avoiding the complexity of storing and processing the full-resolution original signal
3Measurement precision
If high-resolution signals are stored in memory, then playback quality is maintained, but processing time increases
Solution Approach 1:
The patent performs preliminary processing of the signal by demodulating and downsampling it before storage. This pre-processing creates a compact template signal that can be quickly retrieved from memory and then reconstructed on-demand through upsampling and remodulation, reducing the processing time required at playback while maintaining quality
Data Source
AI summary
A method for generating a signal for a device process may include retrieving a reduced-memory template signal centered on a chosen subharmonic of a reconstruction sample rate, upsampling the reduced-memory template signal to generate the signal for the device process at a desired data rate, and communicating the signal to a transducer for playback by the transducer.