Time Delay Spectrometry (TDS)
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Sound Lab TDS Software for Windows
Click to see Enhanced Features

The ultimate in sound analysis
Today's sound professionals demand technology that is accurate and affordable. Sound Lab TDS software from TEF Products, is the Time Delay Spectrometry software that enables you to perform faster, simpler sound measurements on your PC. You can create printouts and incorporate results into presentations to clients.
 
Time Delay Spectrometry, "TDS", is the most widely used TEF Program. TDS is now available as a Windows based application which runs in all of the current Windows programs - 95, 98, Me, 2000, NT and XP. Based on modern 32 bit code, it is easy to use and combines modern Windows functions with a look and feel that is still recognizable to current TEF users.
 
Fine-tune your capabilities
A long list of measurement capabilities means you can use Sound Lab TDS software to analyze a room and solve many acoustic problems. With Sound Lab TDS, you can identify and treat reflections, measure the frequency response of any given reflection, and perform equalizations by using the frequency response.
Sound Lab TDS simplifies aligning clusters and setting delay lines-both easily accomplished through data gained by the TEF. Comprehensive room analysis capabilities include measurements for reverberation, which can be obtained even in the presence of high ambient noise. Sound Lab TDS can also calculate speech intelligibility including %ALCONS, RASTI and STI. Other displays include the Nyquist (phase versus magnitude) and a 100-curve 3D waterfall. The ability to output pink noise, white noise and sine wave signals is included, eliminating the need to carry extra equipment.

New functions include a Pass/Fail Mode, an auto polarity test, easily modified user tests for standardized tests, and modern graphics support. Additionally, as a Windows based program it is possible to have multiple measurements tiled on the screen, and to move between them on a live basis. The HTML format manual means that in the future updates for the manual will be downloadable from our web site. And, further down the road we will be linking the manual directly to streamed audio and video for on-line classroom instruction.

TDS - Enhanced - Improving the TDS function
An important issue in sound and acoustics is accurate reproduction of sound and the ability to reproduce speech without loss of intelligibility. An important tool in sound measurement is the ability to measure the time it takes for a signal of a particular frequency to be absorbed by the environment. The measurement of this absorption time is known as the RT60 time, which can be evaluated using different methods and different bandwidths. The RT60 time is an evaluation of how long previously produced signals take to decay to the point where they no longer interfere with newly produced sounds or speech.
Sound Lab's TDS module is a primary method for evaluating the RT60 time for a room. The advanced time and frequency filtering available in TDS can greatly improve the signal to noise ratio in the measurement and increase the accuracy of the measurement by lowering the apparent noise floor. However, there is still a great deal of work involved in processing the several dozen of frequency bands involved in doing a third octave RT60 measurement and making an octave measurement still involves entering all the parameters required in making each measurement.

 
  Download the Information Sheet for the New Enhanced TDS. 860K.
You will need a copy of the Adobe® Acrobat® Reader to view it.

A sound decision
With Sound Lab TDS software and the TEF 20 or TEF 20 HI, never has so much been so affordable. The TEF 20 offers legendary technology and unrivaled flexibility, which enable you to conduct business with professionalism and precision. It all adds up to one powerful package - and a decidedly sound decision.
To speak with the TEF Sales Department, call 203-938-2588.
 Measurements/Displays

Energy Time Curves (ETC)

  • Selectable frequency range and sweep time
  • Selectable number of data sample points (512, 1024, 2048, 4096, 8192)
  • Selectable measurement windows (Blackman, Hamming, Hanning, Kaiser, Rectangular)
  • Selectable scaling parameters as fine as one dB per division or auto scale
  • Data cursor displays absolute or relative amplitude

Frequency and Phase Response Curves

  • Selectable frequency range, sweep time, frequency resolution, sweep rate and bandwidth
  • Selectable number of data sample points (512, 1024, 2048, 4096, 8192)
  • Selectable scaling parameters as fine as one dB per division or auto scale
  • Data cursor displays absolute or relative amplitude

Noise Criteria Curves (NC)

  • Uses ANSI* type one filters
  • Selectable integration time (1 to 9,999 seconds)

RT60

  • Calculated from ETC data
  • Reverberation time
  • Direct/reverberant ratio

Speech Intelligibility-% ALCONS

  • Calculated from ETC data
  • Calculated direct/reverberant ratio
  • Displays Schroeder Integration Curve

Speech Intelligibility-RASTI and STI

  • Displays data in tabular or graph format
  • Stores NC and ETC data taken during measurement
  • Ability to post process with different noise values

3D Waterfall

  • Select from 2 to 100 curves
  • Examine data from left or right, forward or reverse view

Nyquist Display

  • Amplitude and phase information in a polar format

Heyser Spiral

Three dimensional plot of the real and imaginary components of the TEF signal

Averaging mode

Either vector or magnitude averaging of both frequency and time curves

Overlays

Available for energy time curves, frequency and phase response measurements

Difference mode

Available for energy time curves, frequency and phase response measurements

Pass / Fail Mode

Allows comparison of data to a reference curve

Smoothing of data

Percentage octave smoothing of frequency data (0 to 1000%)

Sound generator

Enables the TEF to output pink noise, white noise, and pure sine wave tones

Data storage

Data storage limited only by hard drive or floppy disk capacity

Function keys

Quick access to frequently used commands

Configuration files

Storage and recall of global parameter settings

TEF requirements

Works with TEF25, TEF20, TEF20 HI and TEF20 SHIP

Computer system requirements

Microprocessor- Pentium class
 
RAM- 16 megabytes of available memory
 
Monitor - VGA (640x480)
 
Hard disk- 6 megabytes for installation
 
Operating system- Windows 95, 98, NT, 2000 or XP
 
Netscape or Internet Explorer for on line manual
 
FOR TEF20's -
 
Interface, parallel- One bidirectional 8-bit parallel port. Must be assigned as LPT1 or LPT2
 
Interface, host- One 8-bit ISA expansion

(TEF20 HI)- slot for TEF20 HI-PC card

* American National Standards Institute

®The trademark SOUND LAB is licensed under United States Trademark Registration No. 1,424,678 and 1,732,027.

THE ABILITY TO SHOW MULTIPLE MEASUREMENTS SIMULTANEOUSLY ON THE SCREEN

WITH THE PUSH OF A SINGLE BUTTON, SOUND LAB MAKES NC (NOISE CRITERIA) MEASUREMENTS AND PROVIDES DISPLAYS QUICKLY.

THE ABILITY TO MAKE FAST, ACCURATE ENERGY TIME MEASUREMENTS ALLOWS YOU TO IDENTIFY AND TREAT REFLECTIONS.

3D WATERFALL CURVES ALLOW DETAILED ANALYSIS OF A LOUDSPEAKER OR THE SOUND FIELD IN A ROOM.

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To speak with the TEF Sales Department, call 203-938-2588.