Built for Standardized Measurement: The Octave Analyzer employs real-time Order 3, 5, and 7 digital Butterworth bandpass filters, in whole, 1/3, or 1/9-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.

Multi-channel Display: View live spectra from up to 16 channels (8 channels on iPhone), simultaneously, including output channels.

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, 5, or 7 Butterworth digital bandpass (order 5 and 7 filters require a Pro license)
Bandwidth: 1/1, 1/3-octave, 1/9-octave (1/9-octave requires a Pro license)
Supported Sample Rates (samples/second): 44100, 48000, 88200, 96000, 176400, 192000
Frequency Weighting: Z (zero, or no weighting), A, C
Sound Level Time Weighting: Fast, Slow, Impulse
Non-acoustic Signal Level Type: Exponential, RMS
Non-acoustic Signal Averaging Time (s): 1/8, 1, infinite (limited only by the measurement duration)
Automatic Stop: Enable/Disable
Automatic Stop Duration: 0.1 seconds up to 14 days, 23 hours, 59 minutes, 59.9 seconds

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

1/9 Octave, per sample rate (Pro Feature)

44100, 48000: 0.74, 0.8, 0.86, 0.93, 1, 1.08, 1.17, 1.25, 1.36, 1.47, 1.6, 1.71, 1.85, 2, 2.15, 2.33, 2.5, 2.71, 2.93, 3.15, 3.41, 3.69, 4, 4.3, 4.64, 5, 5.4, 5.8, 6.3, 6.8, 7.4, 8, 8.6, 9.3, 10, 10.8, 11.7, 12.5, 13.6, 14.7, 16, 17.1, 18.5, 20, 21.5, 23.3, 25, 27.1, 29.3, 31.5, 34.1, 36.9, 40, 43, 46.4, 50, 54, 58, 63, 68, 74, 80, 86, 93, 100, 108, 117, 125, 136, 147, 160, 171, 185, 200, 215, 233, 250, 271, 293, 315, 341, 369, 400, 430, 464, 500, 540, 580, 630, 680, 740, 800, 860, 930, 1000, 1080, 1170, 1250, 1360, 1470, 1600, 1710, 1850, 2000, 2150, 2330, 2500, 2710, 2930, 3150, 3410, 3690, 4000, 4300, 4640, 5000, 5400, 5800, 6300, 6800, 7400, 8000, 8600, 9300, 10000, 10800, 11700, 12500, 13600, 14700, 16000, 17100, 18500, 20000, 21500
88200, 96000: 0.74, 0.8, 0.86, 0.93, 1, 1.08, 1.17, 1.25, 1.36, 1.47, 1.6, 1.71, 1.85, 2, 2.15, 2.33, 2.5, 2.71, 2.93, 3.15, 3.41, 3.69, 4, 4.3, 4.64, 5, 5.4, 5.8, 6.3, 6.8, 7.4, 8, 8.6, 9.3, 10, 10.8, 11.7, 12.5, 13.6, 14.7, 16, 17.1, 18.5, 20, 21.5, 23.3, 25, 27.1, 29.3, 31.5, 34.1, 36.9, 40, 43, 46.4, 50, 54, 58, 63, 68, 74, 80, 86, 93, 100, 108, 117, 125, 136, 147, 160, 171, 185, 200, 215, 233, 250, 271, 293, 315, 341, 369, 400, 430, 464, 500, 540, 580, 630, 680, 740, 800, 860, 930, 1000, 1080, 1170, 1250, 1360, 1470, 1600, 1710, 1850, 2000, 2150, 2330, 2500, 2710, 2930, 3150, 3410, 3690, 4000, 4300, 4640, 5000, 5400, 5800, 6300, 6800, 7400, 8000, 8600, 9300, 10000, 10800, 11700, 12500, 13600, 14700, 16000, 17100, 18500, 20000, 21500, 23300, 25000, 27100, 29300, 32000, 34100, 36900, 40000, 43000
176400, 192000: 0.74, 0.8, 0.86, 0.93, 1, 1.08, 1.17, 1.25, 1.36, 1.47, 1.6, 1.71, 1.85, 2, 2.15, 2.33, 2.5, 2.71, 2.93, 3.15, 3.41, 3.69, 4, 4.3, 4.64, 5, 5.4, 5.8, 6.3, 6.8, 7.4, 8, 8.6, 9.3, 10, 10.8, 11.7, 12.5, 13.6, 14.7, 16, 17.1, 18.5, 20, 21.5, 23.3, 25, 27.1, 29.3, 31.5, 34.1, 36.9, 40, 43, 46.4, 50, 54, 58, 63, 68, 74, 80, 86, 93, 100, 108, 117, 125, 136, 147, 160, 171, 185, 200, 215, 233, 250, 271, 293, 315, 341, 369, 400, 430, 464, 500, 540, 580, 630, 680, 740, 800, 860, 930, 1000, 1080, 1170, 1250, 1360, 1470, 1600, 1710, 1850, 2000, 2150, 2330, 2500, 2710, 2930, 3150, 3410, 3690, 4000, 4300, 4640, 5000, 5400, 5800, 6300, 6800, 7400, 8000, 8600, 9300, 10000, 10800, 11700, 12500, 13600, 14700, 16000, 17100, 18500, 20000, 21500, 23300, 25000, 27100, 29300, 32000, 34100, 36900, 40000, 43000, 46400, 50000, 54000, 58000, 64000, 68000, 74000, 80000, 86000

Sound Level Type:

Time-exponential-weighted Sound Level (Lp)
Equivalent Sound Level (Leq)
Percentile-exceeded Sound Level (Lx) (Lx is a Pro Feature)

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
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

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

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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