Télécharger Sound Spectrum Analysis sur PC

                   


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Sound Spectrum Analysis Sur iTunes

ESTIMATE THE TOTAL NOISE LEVEL BY USING THE SOUND WAVE MODE AT THE MAXIMUM VALUE.  • Automatic stop in the sound wave mode (when increasing or decreasing signal strength).  When the sound is almost inaudible, it is necessary to find the amplitude for the frequency of 1000 Hz on the spectrum (FFT size: 16384).  FFT size: 2048 (the accuracy of determining the frequency of ±12 Hz), 4096 (±6 Hz), 8192 (±3 Hz), 16384 (±2 Hz), 32768 (±1 Hz), 65536 (±0.5 Hz), 131072 (±0.2 Hz).  • Values of any point (for frequency scale and sound wave (at maximum detail)).  The beginning of the signal is not calculated accurately (just like with an automatic stop in the sound wave mode).  To interpolate the frequency of the peak, select the Gaussian window (the accuracy of determining the frequency can increase by 10-100 times).  You can calibrate your microphone by launching a signal generator with a sinusoid frequency of 1000 Hz on another device and making the volume very low.  • Calculation of the amplitude (in the list of peaks) using neighboring bins (to compensate for spectral leakage and use of the window).  The amplitude of the waveform can be changed in the sound wave mode.  Files with saved data (SavedData_[date]_[time].txt) can be copied to a desktop/laptop computer or transferred to another iPhone using iTunes.  The application is designed for analysis of a sound spectrum in real time (with a microphone).  • Linear frequency scale with maximum details (there is a choice for the displayed frequency range).  Now you can stop data collection when the start of the fading signal reaches the end of the FFT buffer.  • Export data to a WAV or text file ("Y=[y1 y2... yn]", "y1;y2;... yn", "x1;y1\nx2;y2;..."). Number of points is adjusted via "FFT size".  • List of frequency peaks.  • Automatic stop in the spectrum mode.  Besides, the application can be used as a measuring instrument of noise level (not for exact measurements).  • Sound level meter (dB SPL).  • Window functions (Blackman, Hamming, Hann (Hanning), Blackman–Nuttall, Gaussian, Flat top).  The app recognizes only files for the UMIK-1 microphone, but you can specify which microphones you need support for.  The number of bins used for calculation is written in brackets.  There are buttons for quick loading and comparing saved files.  This value should be multiplied by 1.2 (to compensate for spectral leakage).  If several peaks have a common base, then they are considered as one peak.  The calculation is not done for the extreme bins or if the adjacent bin is zero.  • Collecting recent data (last minute).  • Interpolation of frequencies in the list of peaks.  It will be the reference value for your microphone.  You can move over all collected data.  The minimum height of the peak for octave bands is 2 dB.