The Audio Capture is a PC based multifunction audio testing system that is ideal for designing, verification and quality check of audio components such as loudspeakers, acoustics and audio electronics. Audio-Capture acquires complex frequency response by applying either a maximum-length sequence (MLS) stimulus, Sweep tone (time-domain chirp), Gated Sine or Multitone to the unit or acoustic environment under test. Audio-Capture interfaces to a quality stereo or four to eight channel soundcard. Simultaneous measurements can be made on multi-channel units or in multiple positions. For production quality tests or performance check a Quality Check module can perform Pass / Fail judgement of up to three parameters at the same time. A user-friendly graphical interface creates the tolerance limits. For the loudspeaker designer, loudspeaker boxes can be simulated by either a database of Thiele-Small parameters or acquired by impedance measurement. Active and passive crossover networks can be simulated. Polar- and Directivity-plots can be acquired. Audio-capture supports several industry standard turntables. For bench test of electronics and sound reinforcement distortion test, Audio-Capture offers several software instruments such as; Spectrum analyser, Dual channel oscilloscope, AC Volt and Watt meter, IM-Distortion analyser, Function generator and LCR-meter.

· Multiple measurements can be taken at several measurement locations and averaged.
· Quality check with tolerance limits for Pass / Fail with post-processing reporting.
· Fast and reliable measurement using MLS stimulus using up to 4 millions points.
· Accelerated Log Sine Sweep (Chirp) increases the dynamic measured range at low frequencies.
· Measurements can be presented as Waterfall graphs or Polar plots.
· Loudspeaker box and crossover simulation using impedance measurement and Thiele-Small parameters.

Time-Domain Stimulus Types
White MLS - Length: 255 – 4.194.303 points for all MLS types
Pink MLS
Chirp - Log Sine Sweep that is converted to time-domain
Spike - The oldest method for impulse measurement
Sin2 pulse - Squared sine pulse
External Wave File - One shot Dual Channel FFT with music as stimulus
Frequency-Domain Stimulus Types
Gated Sine Wave - Sine bursts used for distortion measurements
Log Sine Sweep - Sweep time up to 10s per octave and a maximum resolution of 4096 ppo
Multitone - Ideal for Rub’n Buzz measurements in production
Amplitude Sweep - Sweeps Level, Power or THD vs. amplitude

Analysis Result Windows
Frequency Response - Industry standard windowing and convenient operations such as Smoothing, Normalize, Average etc.
Polar-Plot - This window is combined with a frequency graph where you can select which frequencies that is visible in the polar-plot. Support for industry standard turntables. It also has directivity-plot.
Impedance - This can show both single impedance curves and complete Thiele-Small impedance curve pairs. A Nyquist plot can also be shown.
Impulse (PIR) - This window also have these result curves: Step Response, Shroeder Plot, ETC, Log Square and Cepstrum.
CSD (Waterfall) - This can be shown in standard 3D form or as a sonogram where the colour show the magnitude.
Multi-Graph - Can show several frequency and/or impedance curves at the same time (good for comparison and documentation).

· Mille-volt and dB meter with RMS, Peak and Average detectors, weighting and band-pass filters
· Distortion Analyser; THD, IMD, SMPTE, CCIF and DIM
· L-C-R meter
· Function Generator; with sine, triangle, saw tooth, square, white/pink-noise and bursts waves
· Oscilloscope, with trigger filtering and phosphor emulation
· Spectrum Analyser
· RTA ; with 1, 1/3, 1/6 octave resolution and weighting filters
· Microphone Calibrator; in conjunction with a calibrated microphone is it very easy to calibrate an unknown microphone

· PC with Win 2000 SP4 or XP
· Soundcard with 2 inputs and 2 outputs (duplex mode) or up to 8 channels
· For loudspeaker equalization:
A flat measurement microphone and pre-amp
Loudspeaker power amplification
Digital/analog equalizer or loudspeaker digital signal processor

Download: Audio-Capture PDF Brochure


Frequency response



Waterfall (CSD)

2D Waterfall (CSD)

Limits editor for Quality Check

Some of the instruments


RT-Capture, EQ-Capture, Room-Capture, Audio Capture, WaveCapture and their logos are trademarks of GSW and 7dbm Electronics AB, Sweden. Copyright 2006 GSW and 7dbm Electronics AB. All rights reserved. This product is protected by Swedish and International copyright and other intellectual property laws and international treaties. Unauthorized use, distribution or duplication of this product is strictly prohibited.