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      • First Handheld Sound Camera
      • Simplest Way to Image Sound Sources
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Octave Band Analysis & Analyzer

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.
Picture

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 relatively 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 the 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.
Picture

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.
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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.
Picture

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
Picture

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DEWE SOLUTIONS PTE LTD. Data Acquisition Systems, Software & Sensors... Ready to measure!
Website is maintained by Louis Looi   ©  2020 Louis Some Rights Reserved
  • Home
  • Products
    • Dewesoft Test & Measurement Equipment >
      • USB & Ethercat DAQ Systems
      • Rugged Data Acquisition Systems
      • Portable Data Acquisition Systems
      • Modular Data Acquisition Systems
      • Power Analyzer
      • Data Acquisition Software
      • Sensors
    • Neo Messtechnik Power Quality Analyzer
    • CAE Acoustic & Vibration
    • PCB Test & Measurement Sensors & Instrumentation >
      • Accelerometers
      • Acoustics
      • Force Sensors
      • Impact Hammers
      • Pressure Sensors
      • Strain Sensors
      • Signal Conditioners & Amplifiers
    • IMI Sensors for Condition Monitoring >
      • Industrial Accelerometers for Machinery Health Monitoring
      • 4 - 20mA Vibration Transmitters for Process Vibration Monitoring
      • Pressure Transducers
      • Vibration Switches
    • Endevco Sensors for Challenging Test & Measurement Applications >
      • Accelerometers
      • Accelerometer Simulator
      • Pressure Transducers
      • Signal Conditioners
    • Larson Davis for Noise Monitoring Solutions >
      • Sound Level Meters
      • Environmental Noise Monitoring
      • Workplace Noise & Vibration
    • Resensys Remote Monitoring Sensors
    • OMS Non-Contact Vibration Measurement
  • APPLICATIONS
    • DEWESOFT >
      • Acoustics >
        • Sound Level Meter
        • Octave Band Analysis
        • Sound Intensity
        • Sound Power
        • Reverberation Time RT60
      • Structural Dynamics >
        • FFT Analyzer
        • Fatigue Testing
        • Modal Testing
        • Shock Response Spectrum
        • Sine Reduction Test (COLA)
        • Bridge Monitoring
      • Monitoring >
        • Condition Monitoring
        • Condition Monitoring Software
      • Vibration Analysis >
        • FFT Analyzer
        • Human Body Vibration
        • Octave Analysis
        • Order Tracking Analysis
      • Vehicle Testing >
        • ADAS >
          • Collision Avoidance Testing
          • Blind Spot Detection Testing
          • Lane Departure Warning & Lane Assist System Testing
          • Adaptive Cruise Control Testing
          • Autonomous Vehicles Testing
        • Brake Testing >
          • Flexible Brake Testing System
          • Brake Testing Calculations
          • Automated Testing Workflow
          • Brake Test System Configuration Examples
          • Supported Automated Brake Testing Standards
          • Free Online Brake Test Training & Resources
        • Brake Noise Testing >
          • Brake Noise Detection
          • Brake Noise Input Channel Configuration
          • Brake Noise Analysis Results
        • Combustion Analysis >
          • In-car and Testbed Data Acquisition System
          • Internal Combustion Engine R & D
          • Simple & Intuitive Configuration
          • Heat Release Calculation
          • IC Engine Knocking Detection
          • Combustion Noise Measurement & Analysis
          • Additional Math Calculations & Statistics
          • Combustion Analysis Features
          • Raw Data Storage, Post Processing & Reporting Capabilities
          • Free Online Training Course
        • E-Mobility >
          • Electric Vehicle Testing
          • Hybrid Vehicle Testing
          • Hydrogen Vehicle Testing
          • Battery Testing
          • EV Charging Analysis
          • Testbed & On-road Testing
          • Synchronized Measurement of Several Vehicle Parameters
          • Exemplary E-Mobility
          • Analyzing Different Driving Situations
          • Charging Profile, Time & Efficiency
          • EMC Test
        • Harsh Environment Testing >
          • Vehicle Environmental Tests
          • Distributed Data Acquisition
          • Heating & Air Condition Testing
          • Climate Comfort Testing
        • Roadl Load Data / Durability >
          • Durability Testing Overview
          • Compact All-in-one DAQ System
          • Powerful DAQ Software
          • Digital Interface to 3rd Party Durability Test Benches
        • Vehicle Dynamics >
          • Vehicle Dynamics Test Suite
          • Vehicle Dynamics DAQ System Overview
          • Standard Vehicle Test Maneuvers
          • Data Processing
          • Vehicle Test Suite Applications
          • Easy Controls for Test Driver
      • Power & Energy >
        • Power Analyzer >
          • Motor & Inverter
          • Power Transformer
          • Standby Power
          • Electrical Equipment
        • Power Quality Analyzer >
          • Railway
          • Renewable Energy
          • Wind Power
    • CAE ACOUSTIC & VIBRATION >
      • First Handheld Sound Camera
      • Simplest Way to Image Sound Sources
      • Room / Building Acoustic
      • Compressed Air Leak Detection
      • SoundCam in Automotive Industry
      • Noise at Construction Site
      • Acoustic Applications
    • PCB PIEZOTRONICS >
      • Test & Measurement
      • Aerospace & Defense
      • Automotive
    • ENDEVCO SENSORS >
      • Endevco Sensors Typical Applications
    • IMI INDUSTRIAL SENSORS >
      • Energy
      • PDM & Process Monitoring
    • OMS LASERPOINT & SCANNER
  • VIBRATION TESTING & CALIBRATION SYSTEM
    • DEWESoft Vibration Shakers
    • PCB Portable Handheld Shaker
    • IMI Industrial Portable Handheld Shaker & Calibrator
    • ECON Vibration Testing System >
      • Miniature Shaker
      • Air Cooled Shaker
      • Water Cooled Shaker
      • Climate Chamber Combined Shaker
      • Hydraulic Shaker
      • Multi-Axis Shaker
      • Vibration Controller >
        • VT-6 Series Servo-vibration Controller
        • VT-8 Series MIMO Vibration Controller
        • VT-9 Series Vibration Controller
      • Power Amplifier >
        • VSA-L Series Linear PA
        • VSA-H Series Switching PA
      • Slip Table
      • Head Expander
    • Dewesoft & PCB Instrument Calibration Service >
      • DEWESoft
      • PCB Sensors & Instrumentation
  • INFORMATION
    • DOWNLOAD >
      • DEWESOFT >
        • Products Catalog
        • Applications Brochure
        • Products Brochure
      • CAE Acoustic & Vibration
      • PCB Piezotronics >
        • ENDEVCO Sensors
        • Accelerometers
        • Acoustic & Sound Measurement
        • Force, Load & Strain Sensors
        • Pressure Sensors
        • Torque Sensors
        • Electronics & Signal Conditioning
      • IMI Industrial Sensors >
        • ICP Accelerometers
        • Charge Accelerometers
        • 4-20mA Transmitters
        • Vibration Switches
        • IMI Pressure Sensors
        • Cables, Enclosures & Accessories
        • Electronics
      • Calibration Instruments
    • VIDEOS >
      • CAE Acoustic & Vibration
      • DEWESoft
      • PCB Piezotronics >
        • PCB Piezotronics Virtual Tour
    • TRAINING >
      • Getting Started with DEWESOFT
      • How to Measure Signals
      • How to Analyze Data
    • WEBINARS
  • Contact