Digital Signal Multiplexing Apparatus Arbitrary Frequency Intervals
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Solution Overview
Problem
Conventional digital signal demultiplexing and multiplexing apparatuses are limited in processing signals with arbitrary frequency intervals and bandwidths, requiring the same bandwidth and regular center frequencies for all channels.
Innovation Solution
The apparatus performs discrete Fourier transform on input signals, extracts samples within specific frequency bands, adjusts sample counts to powers of two, and applies discrete inverse Fourier transform, using butterfly computation and waveform shaping coefficients to handle signals with arbitrary bandwidths and frequencies, allowing for flexible channel processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the same number of filters and frequency conversion circuits as the number of channels are used, then channel processing capability is improved, but apparatus size and adjusting parts increase
Solution Approach 1:
Multiple channel processing functions are merged into a single digital signal processing circuit. The circuit performs collective processing of multiple channels by sequentially applying different filter coefficients and frequency conversion parameters to the same hardware resources, eliminating the need for separate filters and frequency conversion circuits for each channel.
Solution Approach 2:
The digital signal processing circuit dynamically reconfigures its operation mode based on the input signal characteristics. By changing filter coefficients, sampling rates, and frequency conversion parameters in real-time, the same circuit can adaptively process different channel configurations without requiring dedicated hardware for each channel.
2Manufacturing precision
If conventional digital signal processing is used, then processing of signals with regular center frequencies is improved, but processing of signals with arbitrary frequency intervals and bandwidths is limited
Solution Approach 1:
The digital signal processing circuit changes its operating parameters including filter coefficients, sampling rates, and frequency conversion factors based on the input signal characteristics. This allows the circuit to accurately process signals with arbitrary frequency intervals and bandwidths by adapting to each signal's specific parameters rather than requiring fixed regular spacing.
Solution Approach 2:
A single digital signal processing circuit is designed to universally handle multiple signal types with different frequency characteristics. The circuit incorporates programmable filter banks and frequency conversion capabilities that can be configured for any channel configuration, making it versatile for both regular and arbitrary frequency spacing applications.
Data Source
AI summary
A digital signal demultiplexing apparatus that can demultiplex and a digital signal multiplexing apparatus that can multiplex signals of channels having arbitrary frequency intervals and bandwidths are provided. The digital signal demultiplexing apparatus performs discrete Fourier transform on an input signal, output samples existing within frequency bands of each channel from samples of the frequency domain, add samples such that the number of samples of each channel become a power of two, and performs, on the samples of each channel, discrete inverse Fourier transform of a length the same as the number of the samples. The digital signal multiplexing apparatus performs discrete Fourier transform of a length the same as the number of samples of an input signal for a predetermined period, outputs samples existing within frequency bands of each channel from samples of the frequency domain of each channel, and arrange the samples according to frequency assignment of each channel to perform discrete inverse Fourier transform.