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On this page you will found :

  1. Posters from the NSL lab
  2. Papers from the NSL lab
  3. Examples of sound morphing
  4. Word morphing
  5. Examples of sound distortions
  6. Examples of TORCs
  7. NSL toolbox
  8. HRTF Database

1. Posters from the NSL lab include :


2. Papers from the NSL lab include (pdf format) :


3. Examples of sound morphing (all .au formats) :

To morph, we first perform a ripple decomposition, and then reconstruct. The following is a sentence decomposed into 99 ripple components and then reconstructed. The slight whining comes from the reconstruction. 
'She had your dark suit in greasy wash-water all year' (Female)

The same but for a male voice. 
'She had your dark suit in greasy wash-water all year' (Male)

The first sentence is morphed progressively into the second (Female to Male)
'She had your dark suit in greasy wash-water all year'

And now the second sentence is morphed into the first one (Male to Female)
'She had your dark suit in greasy wash-water all year'


4. Word morphing :


5. Examples of sound distortions:

The sound 'She had your dark suit in greasy wash-water all year' (Female) is distorted by: 

 
 

6. Examples of TORCs:

Below are 6 examples of TORCs (Temporally Orthogonal Ripple Combinations). Each of the signals is 3 seconds long. The components tones have randomized phases. The signals differ in either the frequency range of  the component tones or their frequency spacing or direction in which the ripples move. 

TORC1:
Description: 
The component tones vary from 125 Hz to 4000Hz. The modulating ripples are upward moving.
 

TORC2:
Description: 
The component tones vary from 125 Hz to 4000Hz. The modulating ripples are downward moving.

TORC3:
Description: 
The component tones vary from 250 Hz to 8000Hz. The modulating ripples are downward moving. 

TORC4:
Description: 
The component tones vary from 500 Hz to 16000Hz. The modulating ripples are downward moving. 

HARMTORC1:
Description: 
The component tones vary from 125 Hz to 4000Hz. The modulating ripples have a frequency spacing of 50Hz. 

HARMTORC2:
Description: 
The component tones vary from 125 Hz to 4000Hz. The modulating ripples have a frequency spacing of 100Hz. 


7. Tools :

Most of the examples on this pages have been computed using Matlab. You can have a look at the tools and programs we use by downloading the following package :  Usage : This is a tar/gzip archive. Under Unix, use 'gzip -d nsltools.tar.gz' and the 'tar xvf nsltools.tar' to install the package.

8. HRTF Database:

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Last update: July 10, 1997 shantanu@isr.umd.edu