频谱 Resources

Showing items tagged with "频谱"

This course project involves acquiring speech signals via microphone and implementing filtering techniques for noise reduction. Developed on MATLAB 7.1 platform, the design process includes three key phases: capturing speech signals with spectral analysis, designing a Hamming window FIR filter, and applying the filter to enhance signal clarity. Post-filtering results demonstrate significant improvements in speech intelligibility, achieving the primary design objective through proper digital signal processing implementation.

MATLAB 257 views Tagged
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This MATLAB program simulates the QPSK modulation process, generates constellation diagrams and spectral plots, and implements error rate analysis with comprehensive performance evaluation metrics.

MATLAB 248 views Tagged
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1) Speech signal acquisition using audio recording functions 2) Spectral analysis through FFT implementation 3) Design of high-pass/low-pass digital filters with frequency response visualization 4) Signal filtering using convolution operations 5) Comparison of pre/post-filtering waveforms and spectra 6) Original signal audio playback 7) Time-stretching algorithms for fast/slow playback 8) Echo effect implementation using delay lines 9) Pitch shifting techniques for high/low voice effects 10) GUI system design with interactive controls

MATLAB 273 views Tagged
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This experiment involves generating an ECG signal, adding noise, and then applying filtering techniques. Starting from an ECG signal data table, we first process the original signal containing known noise through filtering to obtain a clean ECG waveform. We then intentionally add high-frequency and mid-frequency noise to simulate real-world conditions. The noisy signal is displayed and filtered again to demonstrate noise removal. Each time-domain signal is visualized alongside its corresponding frequency spectrum for analysis. Different filter types are implemented and compared throughout the process to evaluate their performance characteristics.

MATLAB 230 views Tagged
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