Audio Spectrum Analyzer - OscilloMeter 7.01

Audio Spectrum Analyzer is a set of Real-Time Multi-Channel Gauges for investigation of data accepted from any ADC you will want or 16-, 24- and 32-bit ADC of sound card. WDM drivers support. FFT Spectrum Analysis, OscilloScope, Frequency counter, AC/DC voltmeter, Signal-to-Noise Ratio, Signal-to-Noise and Distortion, Spurious-Free Dynamic Range, Effective Number Of Bits, Total Harmonic Distortion, Inter-Modulation Distortion, Phase Shift. Special modes of dual-channel FFT spectral analysis: Separate channels spectra, Spectra of digital sum, difference, product of two signals, Spectrum of digital product of original signal and its fundamental, Spectrum of Real and Complex Transfer Function, Cross Spectrum. Standart weighing of spectra according IEC and CCIR. Oscilloscope modes (for dual-channel ADC) are: original signals, sum, difference, dependence of one channel on another, amplitude distribution of input signals.

Major Features:

1. Works by algorithm of Fast Fourier transform (FFT).
2. Size of the FFT block is up to 2²⁴ samples of an input signal.
3. Processing the overlapped time series of samples of input signals for combination of the analysis high resolution both in time and on frequency simultaneously.
4. Spectrum analysis uses different smoothing windows (more than 90 types) for weighting of input signals in time domain.
5. Separate channels spectra.
6. Spectra of digital sum and difference of signals of two channels.
7. Spectrum of digital product of signals of two channels.
8. Spectrum of digital difference of original signal and its fundamental.
9. Spectrum of digital product of original signal and its fundamental. Use for jitter analysis and measurement.
10. Real Transfer Function as Ratio of power of corresponding spectral components versus frequency.
11. Complex Transfer Function as Vector ratio of corresponding spectral components versus frequency.
12. Cross Spectrum as product of left channel spectrum and complex conjugate right channel spectrum.
13. Coherence Function.
14. All above items can be represented by special 3-d spectra versus time view
15. The obtained data and results of Spectral Analysis can be saved to files or clipboard.
16. Oscilloscope modes (for dual-channel ADC) are: original signals, sum, difference, dependence of one channel on another, dependence of channels sum on channels difference (stereo-meter), amplitude distribution of input signals.
17. Spectrum analyzer provides averaging of results of some sequential FFT: equally weighted - scalar or vector; exponentially weighted - scalar. Number of averaging transforms is from 2 up to 20 or infinite.
18. Spectrum analyzer provides measurement of power in fractionary-octave bands: from entire octave to its 1/96 part.
19. The parameters of noise and distortion in audio range can be calculated according to the subjective perception. The weighing is made under the recommendations of International electrotechnical commission (IEC-A,B,C,D), International Radio Consultative Committee (Consultative Committee on International Radiocommunications - CCIR-468-2/DIN45405) or ANSI/IEEE743-1384.
20. Synchronization of Spectrum analyzer is independent from the oscilloscope.
21. Spectrum analyzer can display holding or decaying maximum values of real-time spectra.
22. Indication of ADC input overload (clipping).
23. The OscilloMeter - Spectrum analyzer demo works with ADC of a sound card and is a fully functional copy of the program with one exception that input time is limited to 15 seconds after each "Start" button click.

Requirements: PII-400, 64 Mb, Sound Card

Improvements of this version: Improved 3-D graphics

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