12 reviews

Octave Band AnalyzerOctave band frequency analysis solution for sound and noise

Octave band analysis is an indispensable tool for sound measurement because it gives a close approximation of how the human ear responds. Dewesoft octave band analyzer meets all of the IEC and ANSI specifications for octave filters.

Dewesoft offers flexible data acquisition hardware with an industry-leading 7-year warranty, free lifetime software updates, and free technical support.

IEPE

IEPE

Voltage

Voltage

Vibrations

Vibrations

Frequency

Frequency

Video

Video

Sound

Sound

Sound pressure

Sound pressure

USB 2.0

USB 2.0

USB 3.0

USB 3.0

Ethernet

Ethernet

IP50

IP50

-40°C to +60°C

-40°C to +60°C

Octave Band Analyzer highlights

True Octave Analysis

True octave filters exactly represent the filter sets defined by the IEC 61260 standards and give the user a real-time response for vivid live visualization of data, crucial for advanced acoustic analysis.

Synthesized Analysis

For large channel count systems, Dewesoft provides extremely fast calculations from the frequency domain.

Seamless Acoustic Suite Integration

The octave analyzer is perfectly integrated with sound level, sound power, sound intensity, and other modules for advanced sound analysis.

Resolution up to 1/24 Octave

For deep analysis of data Dewesoft provides very narrow band analysis up to 1/24th octave.

Frequency Sound Weighting

Standard frequency weighting curves (A, B, C, D, and Z) can be applied directly in a frequency domain for the analysis of sound.

Frequency Averaging

Block history with linear, peak, exponential averaging or overall calculation is available.

Software included

Every Dewesoft data acquisition system is bundled with award-winning DewesoftX data acquisition software. The software is easy to use but very rich and deep in functionality. All software updates are free forever with no hidden licensing or yearly maintenance fees.

Dewesoft quality and 7-year warranty

Enjoy our industry-leading 7-year warranty. Our data acquisition systems are made in Europe, utilizing only the highest build quality standards. We offer free and customer-focused technical support. Your investment into the Dewesoft solutions is protected for years ahead.

Constant Percentage Bandwidth (CPB)

CPB filter is a filter whose bandwidth is a fixed percentage of a centre frequency. The width of the individual filters is defined relative to their position in the range of interest. The higher the centre frequency of the filter, the wider the bandwidth.

The widest octave filter used has a bandwidth of 1 octave. Many subdivisions into smaller bandwidths are often used. The filters are often labeled as “Constant Percentage Bandwidth” filters. A 1/1-octave filter has a bandwidth of close to 70% of its centre frequency. The most popular filters are perhaps those with 1/3-octave bandwidths. One advantage is that this bandwidth at frequencies above 500 Hz corresponds well to the frequency selectivity of the human auditory system. DEWESoft supports up to 1/24-octave bandwidth.

Calculation Principle

True octave(ANSI, IEC)

Uses filter sets as in analog octave analyzers. One of the main advantages is that we can really see the dynamic behavior of the input data.

Synthesized

Calculated using FFT as the base and is updated when every FFT is being calculated.

Frequency Weighting

Frequency weighted noise measurements offer standard ways to measure sound, and we use each of these frequency weightings for different types of measurements.

  • A-weighting is applied to measured sound levels in an effort to account for the relative loudness perceived by the human ear. The human ear is less sensitive to low and high audio frequencies.

  • B-weighting is the best weighting to use for music listening purposes.

  • C-weighting is used for high-level noise measurements.

  • D-weighting was specifically designed for use when measuring high-level aircraft noise in accordance with the IEC 537 measurement standard. The large peak in the D-weighting curve reflects the fact that humans hear random noise differently from pure tones, an effect that is particularly pronounced around 6 kHz.

  • Z-weighting is linear at all frequencies and it has the same effect on all measured values.

Averaging Type

Averaging is used to get more stable results. There are three averaging modes available:

  • Linear averaging - each FFT counts the same

  • Exponential averaging - FFT’s become less and less important with time

  • Peak hold averaging - only maximum results are stored and shown

FAQFrequently asked questions

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