Real-time Octave Spectrum Analyzer Tool
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Octave Spectrum Analyzer

Reference: Documentation

Features
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Built for Standardized Measurement: The Octave Analyzer 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. And, it offers standard sound level metrics, including time and frequency weighting, defined by ANSI S1.4 and IEC 61672 standards for sound level meters.
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Multi-channel Display: View live spectra from up to 16 channels (8 channels on iPhone), simultaneously, including output channels.
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Save Data: Export spectrum magnitude values 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.
Live Web Preview (Pro Feature): Use SignalScope's built-in http web server to monitor the spectrum remotely via a standard web browser. Your own custom software can remotely retrieve information from the Octave Analyzer as JSON data to format, analyze, store, or display according to your specific needs.
Specifications
  • Input: Up to 16 channels simultaneously (limited to 8 on iPhone), selected from any available input, output, or virtual output channels
  • Filter Type: Order 3 Butterworth digital bandpass
  • Bandwidth: 1/1, 1/3-octave
  • Supported Sample Rates (samples/second): 44100, 48000, 88200, 96000, 176400, 192000
  • 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
  • Frequency Weighting: Z (zero, or no weighting), A, C
  • Sound Level Type:
    • Time-exponential-weighted Sound Level (Lp)
    • Equivalent Sound Level (Leq)
    • Percentile-exceeded Sound Level (Lx) (Lx is a Pro Feature)
  • Sound Level Time Weighting: Fast, Slow, Impulse
  • Signal Level Type: Exponential, RMS
  • Signal Averaging Time (s): 1/8, 1, infinite (limited only by the measurement duration)
  • Automatic Stop: Enable/Disable
    • Duration: 0.1 seconds up to 14 days, 23 hours, 59 minutes, 59.9 seconds
  • Automatic Start Triggering: Enable/Disable
    • Source Channel: selected from any available input, output, or virtual output channels
    • Threshold: Recording will start when this user-defined threshold is exceeded on the source channel
    • Pre-trigger Delay: Up to 100 milliseconds of data from before the trigger event will also be captured
  • Data Logging (Pro Feature)
    • Log Size: Uses Automatic Stop Duration
    • Log Levels: Enable/Disable
    • Log Interval: User-defined, with constraints
      • Data Log Size > 10 hours: Log interval >= 10 seconds
      • Data Log Size > 1 hour: Log interval >= 1 seconds
      • Data Log Size <= 1 hour: Log interval >= 0.1 seconds
    • Reset Leq at Intervals: Enable/Disable
    • Auto Save Log: Enable/Disable
    • Log File Format: CSV, MAT, TXT
    • Base File Name: User-defined
    • Maximum Auto Saves: User-defined, if Auto Save Log is enabled, data logging will stop after this many log files have been saved
    • Reset All After Auto Save: Enable/Disable
  • Notification Events (Pro Feature): Local Notifications
    • Auto-Stop
    • Lp_max Exceeds: User-definable sound level threshold
    • Leq Exceeds: User-definable sound level threshold
  • Scale
    • Vertical divisions: 10
    • Autoscale: Off, Auto, Up, Down
    • Vertical Axis: Lin, dB
    • dB Level 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 Level 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
    • Horizontal Axis (Frequency Scale): Lin, Log
    • Frequency Units: Hz, cpm
    • Visible Frequency Limits: Min/Max, User-selectable from available center frequencies
  • Display
    • Show Secondary Level: Enable/Disable
    • Secondary Level Type: Max, Peak
    • Draw Div Lines: Enable/Disable
    • Reference Curves: Off, NC, RNC, NR
    • Log Display Channel: User-selectable from any channel which has been selected for analysis
  • Cursor
    • Horizontal Bar: Hidden or drawn at the instantaneous amplitude of any available spectrum
    • Peak Track: Off, Max, Min
      • The cursor can track the peak spectrum 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 Octave 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
  • Average Curve (Pro Feature)
    • The total number of loaded static spectra (including average curves) and live spectra cannot exceed 16 (8 on iPhone)
    • Max Data Files Per Average Curve: 999999999
    • Data File Format: CSV, MAT, TXT (only files created by the Octave Analyzer tool)
  • Specifications Subject to Change
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