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Sound Intensity Analyzer

Reference: Documentation

Found in these Apps
Features
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3 Axis Sound Intensity and Acoustic Particle Velocity: Measure up to 3 axes of acoustic intensity, acoustic particle velocity, and acoustic pressure with 2-microphone (p-p) sound intensity probes in whole or 1/3-octave bands, or in narrowband FFT-based spectra. It can also indicate the sign (positive or negative direction, relative to the orientation of the probe) of the intensity and velocity data in individual frequency bands as well as for overall levels. (Multi-axis measurements require a multi-axis probe. Sound Intensity probes sold separately by third parties.)
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Built for Standardized Measurement: The Sound Intensity Analyzer was designed according to the requirements specified in ANSI standard S1.9, Instruments for the Measurement of Sound Intensity. It offers phase compensation for each 2-mic (p-p) probe axis, means of measuring the pressure-residual-intensity index, and overload (clipping) indicators. It employs real-time Order 3 digital Butterworth bandpass filters, in whole or 1/3-octave frequency bands, designed with standard filter characteristics defined by ANSI S1.11 and IEC 61260.
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User-friendly Frequencies: Traditional FFT-based spectrum analyzers use FFT's (Fast Fourier Transforms) with lengths that are powers of 2 (e.g. 2 to the 12th power = 4096). With typical audio sample rates, such as 48 kHz, this yields non-integer (awkward) frequency resolutions, such as 11.71875 Hz (48000/4096 = 11.71875). SignalScope's Sound Intensity Analyzer uses mixed-radix FFT's that yield frequency resolutions that are more than just user-friendly—they allow for precise amplitude measurement at frequencies such as 1000 Hz (a frequency commonly used for calibrating sound level meters and measuring total harmonic distortion, or THD). For example, an FFT length of 4800, when used with a sample rate of 48 kHz, yields a frequency resolution of exactly 10 Hz (48000/4800 = 10).
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Save Data: Export frequency and time domain data and metadata to a data file (.csv, .mat, or .txt). Or, generate a high-resolution image of the graph and save it to a PDF file.
Specifications
  • Input: Up to 3 channel pairs can be selected and analyzed simultaneously, with channels selected from any available input, output, or virtual output channels
  • Measurement Types:
    • Sound Intensity Level
    • Particle Velocity Level
    • Sound Pressure Level
    • Sound Intensity Time Data
    • Particle Velocity Time Data
    • Sound Pressure Time Data
    • Pressure-residual-intensity
  • Bandwidth: Narrowband (FFT), octave, 1/3 octave
  • Supported Sample Rates (samples/second): 44100, 48000, 88200, 96000, 176400, 192000
  • Octave Spectrum
    • Filter Type: Order 3 Butterworth digital bandpass
    • Nominal Band Center Frequencies (Hz)
      • Whole Octave, per sample rate
        • 44100, 48000: 1, 2, 4, 8, 16, 31.5, 63, 125, 250, 500, 1000, 2000, 4000, 8000, 16000
        • 88200, 96000: 1, 2, 4, 8, 16, 31.5, 63, 125, 250, 500, 1000, 2000, 4000, 8000, 16000, 32000
        • 176400, 192000: 1, 2, 4, 8, 16, 31.5, 63, 125, 250, 500, 1000, 2000, 4000, 8000, 16000, 32000, 64000
      • 1/3 Octave, per sample rate
        • 44100, 48000: 0.8, 1, 1.25, 1.6, 2, 2.5, 3.15, 4, 5, 6.3, 8, 10, 12.5, 16, 20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500, 3150, 4000, 5000, 6300, 8000, 10000, 12500, 16000, 20000
        • 88200, 96000: 0.8, 1, 1.25, 1.6, 2, 2.5, 3.15, 4, 5, 6.3, 8, 10, 12.5, 16, 20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500, 3150, 4000, 5000, 6300, 8000, 10000, 12500, 16000, 20000, 25000, 32000, 40000
        • 176400, 192000: 0.8, 1, 1.25, 1.6, 2, 2.5, 3.15, 4, 5, 6.3, 8, 10, 12.5, 16, 20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200, 250, 315, 400, 500, 630, 800, 1000, 1250, 1600, 2000, 2500, 3150, 4000, 5000, 6300, 8000, 10000, 12500, 16000, 20000, 25000, 32000, 40000, 50000, 64000, 80000
    • Averaging Time (s): 1/8, 1, infinite (limited only by the measurement duration)
    • Frequency Limits: Min/Max, User-selectable from available center frequencies
    • Min Frequency Band Default (Hz): 63 (octave), 50 (1/3 octave)
    • Max Frequency Band Default (Hz): 8,000 (octave), 10,000 (1/3 octave)
  • Narrowband (FFT) Spectrum
    • FFT Type: Mixed Radix
    • Frequency Resolution (Hz):
      • 10, 8, 5, 4, 2, 1
    • Measurement Length (s):
      • 0.1, 0.125, 0.2, 0.25, 0.5, 1
    • FFT Length: Set automatically, based on frequency resolution and current sample rate (e.g. at 48 kHz, a frequency resolution of 5 Hz requires an FFT length of 9600 points)
    • Data Window: Uniform (rectangular)
    • Overlap (%): Off (0)
    • Frequency Limits: Min/Max, User-adjustable between 0 and Nyquist
    • Averaging: Off, Linear (Stable), Exponential, Peak Hold
  • Scale
    • Horizontal divisions: 10 (linear frequency scale)
    • Vertical divisions: 10
    • Autoscale: Off, Auto, Up, Down
    • Spectrum Vertical Axis: Lin, Log, dB
    • Spectrum Type: Octave, FFT
    • dB Vertical Scale (dB/Div)
      • 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.08, 0.09, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.8, 0.9, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 8.0, 9.0, 10.0, 12.0, 15.0, 16.0, 18.0, 20.0, 24.0, 25.0, 27.0, 30.0
    • Lin/Log Vertical Scale (Units/Div)
      • 1e-9, 2e-9, 3e-9, 4e-9, 5e-9, 6e-9, 8e-9, 10e-9, 20e-9, 30e-9, 40e-9, 50e-9, 60e-9, 80e-9, 100e-9, 200e-9, 300e-9, 400e-9, 500e-9, 600e-9, 800e-9, 1e-6, 2e-6, 3e-6, 4e-6, 5e-6, 6e-6, 8e-6, 10e-6, 20e-6, 30e-6, 40e-6, 50e-6, 60e-6, 80e-6, 100e-6, 200e-6, 300e-6, 400e-6, 500e-6, 600e-6, 800e-6, 1e-3, 2e-3, 3e-3, 4e-3, 5e-3, 6e-3, 8e-3,10e-3, 20e-3, 30e-3, 40e-3, 50e-3, 60e-3, 80e-3,100e-3, 200e-3, 300e-3, 400e-3, 500e-3, 600e-3, 800e-3, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 8.0, 10.0, 20.0, 30.0, 40.0, 50.0, 60.0, 80.0, 100.0, 200.0, 300.0, 400.0, 500.0, 600.0, 800.0, 1e3, 2e3, 3e3, 4e3, 5e3, 6e3, 8e3, 10e3, 20e3, 30e3, 40e3, 50e3, 60e3, 80e3, 100e3, 200e3, 300e3, 400e3, 500e3, 600e3, 800e3
    • Frequency Axis: Lin, Log
    • Frequency Units: Hz, cpm
  • Cursor
    • Harmonic Cursors: up to 128
    • Horizontal Bar: Hidden or drawn at the instantaneous amplitude of any available waveform
    • Peak Track: Off, Max, Min
      • The cursor can track the peak value of any channel which has been selected for analysis
  • Data Export
    • Data File Format: CSV, MAT, TXT
    • Image: PDF
    • Optionally include current location in exported data files.
  • Data Import
    • Data File Format: CSV, MAT, TXT (only files created by the Sound Intensity Analyzer tool)
    • The total number of loaded static spectra and live spectra cannot exceed 16 (8 on iPhone)
    • Trace Opacity: 0.25 - 1.0
    • Trace Thickness: 1, 2, 3
  • Specifications Subject to Change
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