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 Post By：2008-11-12 11:00:28 [只看该作者]
SoundCheck Step Editors
Hardware
- Windows Multimedia devices including sound cards (PCI, PCMCIA, USB, Fire wire), Bluetooth, and VoIP
- NI DAQmx data acquisition cards including NI 4461
- Calibration and settings including sampling rate, bit depth, analog or digital audio, maximum voltage, and alias free frequency limit.
- I/O cards for TTL relay control
- Computer interfaces control with RS-232, GPIB (IEEE-488), footswitch and buzzer
- DC Connect? programmable DC power supply and measuring amplifier setup
- Multichannel configuration with table view of channels
Calibration
- Measure Input and Output sensitivities for transducers, amplifiers, and signal conditioning devices using built-in routines
- Calibration with external, absolute source including acoustic, vibration, or voltage
- User-defined physical units (e.g. Pa, V, G, etc.)
- Complex Equalization (amplitude and phase) of input and output devices (e.g. microphones and amplifiers). If the output device is an acoustic source, (e.g. loudspeaker, mouth simulator), SoundCheck can automatically equalize any test signal including arbitrary signals.
Messages
- Message steps initiated based on Pass/Fail conditions
- Display text message in local language, input numeric values, Yes/No dialog
- Digital I/O
- IEEE-488 and RS-232
Stimulus
- Sine (stepped – any linear or logarithmic resolution, log sweep, and amplitude sweep)
- Two-tone (two sweeping tones for Difference Frequency Distortion or one fixed and one sweeping tone for IM)
- Multitone with linear or logarithmic spacing
- Noise (pink & white with user-defined bandpass range)
- Arbitrary (any WAV file)
- Equalization
- DC (requires Listen DC Connect or National Instruments hardware)
Aquisition
- Play & Record, or any combination of Signal Generator, Multimeter, RTA, and FFT
- Capture response time waveform as a WAV file
- Multichannel-multicard acquisition
- Triggered record
Analysis
Time:
- Impulse Response
- Auto-Correlation
- Cross-Correlation
- Time Envelope
- Loose particle detection
- Automatic delay compensation
Frequency:
- FFT & DFT (any size)
- Hann and Blackman-Harris windows
- Auto-spectrum & Cross-spectrum
- Spectral Scaling: RMS or Power Density
- Frequency and phase response including harmonics
- Complex or power averaging
- Relative or absolute response
- Coherent Output Power
- Non-Coherence
- Coherence
- Signal-to-Noise Ratio
- Measurement Confidence
- Impedance
Algorithms:
- Broadband RMS to measure unfiltered level of an AC or DC signal
- Time Selective Response to measure free-field and impulse response of fundamental AND harmonics. Deconvolved time response is included
- Heterodyne to measure frequency and phase response only
- HarmonicTrak? Algorithm tracks level and phase of any user-selected harmonics including sub-harmonics or intermodulation products; no limit to number of harmonics
- Loose particle detection
- Multitone
- Dual Channel Analysis
Distortion:
- THD and Rub & Buzz
- Normalized THD and Rub & Buzz distortion (harmonics compared to amplitude of fundamental at measured frequency)
- THD + Noise
- Intermodulation or Difference Frequency
- Difference Frequency
- Non-Coherent Distortion
Recall
- Automatically recall data or results
Post Processing
- Complex math: Addition, subtraction, multiplication, division, offset by constant (X, Y, or Z dimensions), change sign, reciprocal, absolute value, square, square root, exponential, and logarithm
- Scalar (Ave, Power, Max, Min, Resonant Frequency, Q, Notch, Loudness)
- Windowing (time and frequency)
- User-defined Equations (e.g. Thiele-Small parameters)
- Change resolution to Nth octave or user-defined linear or logarithmic
- Nth Octave synthesis
- Power Summation of any user-defined frequency range
- Group delay
- Unwrapped phase
- Search range to find intersection of two curves (e.g. -3dB points of crossover network)
- Curve smoothing with 1/3, 1/6, 1/12, and 1/24 octave or user-defined linear or log resolution
- Loudness rating according to IEEE and ITU-T; example sequences for TIA and other industry standards included
- Attack & Release time calculates the time for the response signal to rise or decay, respectively, by a user-defined amplitude in dB or linear units
- Directivity Index
- Resampling and sampling rate correction
- FFT / Inverse FFT
Statistics
- Average
- Max, Min, Mean
- Standard Deviation with user-defined sigma
- Process Control (Pp & Ppk)
- Best and Worst Fit to Average with ranking
- Yield
Limits
- Pass/Fail
- Absolute
- Floating (x & y directions)
- Aligned to a pre-defined value (e.g. 0 dB at 1 kHz)
- Dynamic, using live measurements
- Waveforms, single values, and curves
- Control of significant digits
- Margin, Critical and Failed points
Display
- Multiple displays can be placed on the screen to view curves, single values, and test results with PASS/FAIL indicators; display layout can be transferred to Word or as HTML document; curves with different units (e.g. dBSPL and Ohms) can be displayed in one graph with no limit to number of curves displayed in a single graph; data from any one graph can be exported directly to a new Excel file or pre-defined template
- Displays include XY graph, table, results, text, polar plots and embedded images
Printing
- Automatically print display layout to default printer or HTML
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