||Maximum Length Sequence (MLS)
Sound Lab MLS Software for Windows
- Maximum Length Sequence measurements
- Now you can get TDS technology and TEF performance, along with the
ability to do Maximum-Length Sequence measurements (MLS) in one analyzer.
Sound Lab MLS software enables you to obtain an impulse response containing
the entire audio frequency range over the measured time range. You can
post process the data off-site to see information you didn't even think
about when you performed the measurement.
- Imagine being able to analyze a comprehensive set of measurement data
out of a single measurement.
- Power, flexibility, convenience
- Multiple display options include:
- Impulse, Doublet, Intensity, ETC, Log-Squared Impulse from Time Domain
- Magnitude, Phase, Group Delay, Heyser Spiral, Nyquist from Frequency Domain
- 3-D Waterfall Phase
- Time can be further processed to find Phase, Instantaneous Frequency, RT60, %ALcons and Heyser Spiral
- Intelligibility can be found from impulse as STI, RaSTI or %ALcons
- The powerful DSP in the TEF guarantees sequence lengths from 5.3 milliseconds
to 10.9 seconds, making the TEF implementation of MLS flexible enough to
meet virtually any measurement requirement. Full bandwidth long sequences
are especially useful for measuring large concert halls and arenas, while
medium to short sequences can be used in smaller spaces and for electrical
and speaker testing.
- Impulse is stored as a WAV file for easyexport to other applications, and all post processing is available for any WAV file.
- You no longer have to choose between TDS and MLS
- Combined with your personal computer and the appropriate software,
you can transform the TEF into a TDS analyzer, noise analyzer, real time
analyzer, and now, a maximum-length sequence analyzer. So, you no longer
have to choose between TDS and MLS, as long as you choose TEF.
- To speak with the TEF Sales Department, call 203-938-2588.
- Tests performed
- Impulse Response using Maximum-Length Sequences (MLS)
- Full 0 to 24 kHz frequency range
- Selectable number of data sample points (255 to 524287)
- Selectable sequence lengths (5.3125 milliseconds through 10.922 seconds)
- Alternate sequence seeds
- Data cursors
- Selectable scaling parameters as fine as one dB per division, or auto
- Editing capability
- Octave band filtering
- Post processing multiple display options
- Time domain
- Log-Squared Impulse
- Group Delay
- Heyser Spiral
- Select from 2 to 1000 curves
- Examine data from any angle
Speech Intelligibility-RASTI and STI
- Displays data in tabular or graph format
Noise Criteria Curves (NC)
* American National Standards Institute
- Uses ANSI* type one filters
- Selectable integration time (1 to 9,999 seconds)
- Available in select measurements
- Difference mode
- Available for energy time curves, frequency and phase response measurements
- Smoothing of data
- Percentage octave smoothing of frequency data (0 to 1000%)
Data file formats
- Sound Lab ASCII and Binary
- Configuration files
- Storage and recall of global parameter settings
- TEF requirements
- Works with the TEF25. Also with TEF20, TEF20 HI and TEF20 SHIP. Of the TEF20's, TEF20 HI or TEF20 SHIP is recommended. Serial communication limits sequence length to 341 milliseconds.
Computer system requirements
- Microprocessor - Pentium Class
- RAM - 32 megabytes of available memory
- Monitor - VGA (1024x768 recommended minimum)
- Hard disk - 80 megabytes
- Operating system - Windows 9x/ME/2000/NT/XP
- FOR TEF20's -
- Interface, serial - One RS232 serial port capable of operating at
57.6 kilobaud. Must be assigned as COM 1 or COM 2
- Interface, parallel - One bidirectional 8-bit parallel port. Must be
assigned as LPT1 or LPT2
- Interface, HI - One 8-bit ISA expansion slot for TEF 20 HI-PC card
®The trademark SOUND LAB is licensed under United States Trademark
Registration No. 1,424,678 and 1,732,027.
|SOUND LAB MLS GIVES YOU THE ABILITY TO POST PROCESS
A COMPREHENSIVE SET OF DISPLAYS FROM A SINGLE IMPULSE RESPONSE.
|CURSORS ALLOW YOU TO IDENTIFY POINTS AND TO SELECT REGIONS
FOR FREQUENCY ANALYSIS.
|SUCCESSIVE FFTs ON THE IMPULSE GIVES A PLOT OF TIME v ENERGY v FREQUENCY.
|A TOP-DOWN VIEW OF THE 3D DISPLAY RENDERS A SONOGRAPH.