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Multi-Instrument - Spectrum Analyzer
Sound Card Spectrum Analyzer

1. Seven view types: Real time Amplitude Spectrum, Real time Phase Spectrum, Real time Auto Correlation Function, Real time Cross Correlation Function, Real time Coherence / Non-Coherence Function, Real time Transfer Function / Impedance Analyzer, Real time Impulse Response.

2. Independent X axis and Y axis zooming and scrolling.

3. In Amplitude Spectrum, Y axis supports relative modes in linear and dBr scale, and absolute mode in RMS voltage, dBV, dBu, dBSPL, dBFS scale. X axis supports linear, logarithmic and octave scale (1/1, 1/3, 1/6, 1/12, 1/24, 1/48, 1/96).  Support power spectrum density display.  Y axis can be converted to impedance display.

4. Analysis results can be exported as TXT files.

5. Data curve can be printed out directly or saved as BMP files.

6. Fast display refresh rate: about 50 frames per second (tested with a sound card under Windows XP SP2 on IBM ThinkPad R51 Laptop PC with Intel Pentium M processor 1.60 GHz, with scan time=10 ms and FFT size=1024 and both the Oscilloscope and the Spectrum Analyzer running under "Auto" mode). Thus data are displayed and analyzed in "true" real time.

7. The colors of display, font size, screen refresh rate are configurable.

8. FFT size can be adjusted from 128 to 4194304 points.

9. Allow record length to be different from FFT size. If the FFT size is greater than the record length, then zero(s) will be added at the end of the actual measurement data during FFT computation. If the FFT size is less than the record length, then the measurement data will be split into different segments with the size of each segment equal to the FFT size. Segment overlap percentage can be selected among 0%, 25%, 50%, 75%. The final result will be obtained by averaging the FFT results from all segments.

10. Support 55 window functions: Rectangle, Triangle (or Fejer), Hanning, Hamming, Blackman, Exact Blackman, Blackman Harris, Blackman Nuttall, Flat Top, Exponential, Gaussian, Welch (or Riesz), Cosine, Riemann (or Lanczos), Parzen, Tukey, Bohman, Poisson, Hanning-Poisson, Cauchy, Bartlett-Hann, Kaiser, etc.

11. Display peak frequency with sub-FFT-bin-size accuracy in Amplitude Spectrum display, second peak time delay and corresponding coefficient in Auto Correlation Function display, peak time delay and corresponding coefficient in Cross Correlation Function display, peak frequency and corresponding coefficient in Coherence Function display, peak frequency and corresponding gain and phase in Transfer Function display, peak time and corresponding value in Impulse Response display.

12. Allow the measurement of Total Harmonic Distortion (THD), THD+Noise (THD+N), Signal in Noise and Distortion (SINAD), Signal-to-Noise Ratio (SNR) and Noise Level (NL), Total Non-Coherent Distortion+Noise (TNCD), and GedLee Metric in a specified frequency range.

13. Allow the measurement of IMD-SMPTE/DIN, IMD-CCIF1, IMD-CCIF2, Crosstalk, Bandwidth (-3dB), Harmonics, Energy in user defined frequency bands, Peaks, Wow & Flutter, sound loudness, loudness level & sharpness.

14. Support one cursor reader and two markers which stick to the measurement data.

15. Intra-frame processing includes: Remove DC Component, Frequency Compensation, Frequency Weighting (flat, A weighting, B weighting , C weighting, ITU-R 468 weighting), and Smooth via Moving Average. Frequency compensation is achieved via loading a user configurable text-based Frequency Compensation File (*.fcf).

16. Four inter-frame processing methods: None, Peak Hold, Linear Average, Exponential Average. The number of frames (2~200, forever) for peak hold or linear averaging can be specified. The process can be reset during runtime if “forever” is chosen.

17. Five chart types: Line, Scatter, Column, Bar, and Step. Line width is adjustable.

18. Up to five reference curves can be set for each channel. The reference curve can be configured by either copying the current curve, or loading a properly formatted text file or a previously saved reference file from the hard disk.  Reference curves can be assigned as High-High, High, Low, Low-Low limits.

19. The data in the graph can be copied into the clipboard as text and later paste into other software such as Microsoft Excel for further analysis. The image of the graph can be copied into the clipboard as Bitmap image and later paste into other software such as Microsoft Word.

20. Supports Multilingual User Interface under Windows 2000, XP, 2003, Vista, 7, 8, 10 and above. Currently supported languages are English, French, German, Italian, Portuguese, Spanish, Russian, Simplified Chinese, Traditional Chinese, Japanese and Korean.


USB Spectrum Analyzer THD Measurement
Measurement of THD, THD+N, SNR, SINAD, ENOB...
USB Spectrum Analyzer IMD Measurement
Measurement of IMD (SMPTE)
USB Spectrum Analyzer Crosstalk Measurement
Measurement of crosstalk
USB Spectrum Analyzer Frequency Response Measurement using White Noise
Measurement of frequency response using white noise
USB Spectrum Analyzer Fast Frequency Response Measurement using Multi Tones
Fast measurement of frequency response using multi-tones
USB Spectrum Analyzer Frequency Response Measurement using Pink Noise and Octave Analysis
Measurement of frequency response using pink noise + octave analysis
VT USB Spectrum Analyzer Impact Test
Impact test

USB Spectrum Analyzer Signal Spectrum
Normalized amplitude spectrum of a signal
USB Spectrum Analyzer Auto Correlation Measurement
Auto correlation
USB Spectrum Analyzer Cross Correlation Measurement
Cross correlation
USB Spectrum Analyzer Phase Spectrum
Phase Spectrum
USB Spectrum Analyzer Kaiser 6 Window Function Spectrum
Spectra of Kaiser 6 Window Function

USB Spectrum Analyzer Coherence
USB Spectrum Analyzer Bode Plot
Bode Plot

USB Spectrum Analyzer Impulse Response
Impulse Response
USB Spectrum Analyzer GedLee Metric
GedLee Metric for Perception Based Nonlinear Distortion

USB Spectrum Analyzer 2 and 3 harmonics vs fundamental
Comparison between a distorted sine wave and its 2nd & 3rd harmonics residual (obtained by 1022-order band-pass FIR)
USB Spectrum Analyzer Impedance Analyzer
Impedance Analyzer

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