Virtins Sound Card Spectrum Analyzer 3.1

Virtins Sound Card Spectrum Analyzer 3.1 is a beneficial and powerful tool which will satisfies with a powerful PC based virtual instrument.

It consists of a sound card real time oscilloscope and a sound card real time spectrum analyzer and can run them concurrently. Unlike most of the sound card oscilloscopes in the market which search trigger event after data collection, it features a specially designed data acquisition approach which is able to monitor the input signal continuously without missing any trigger event before the frame of data is collected.

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 Function, Real time Transfer Function, 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).
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, 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) 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.
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.
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 and above. Currently supported languages are English, French, German, Italian, Portuguese, Spanish, Russian, Simplified Chinese, Traditional Chinese, Japanese and Korean. It supports only the local language and English under Window 95, 98, Me and Windows NT.