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.)
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.
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).
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.
Input: Up to 3 channel pairs can be selected and analyzed simultaneously, with channels selected from any available input, output, or virtual output channels