Name: Professional Real-Time Noise Cancellation and Speech Enhancement Software

Text: Professional Real-Time
Noise Cancellation &
Speech Enhancement Software

Sound Cleaner is unique software for filtering of noise-corrupted sound
recordings and improvement of speech intelligibility.
The user can adjust the filtering parameters and hear the changes
made in real-time.
Allows the user to reduce different types of noise from any sound
source, even in cases where the speech is hardly intelligible.

! Signal is processed by a sequence of
modules. There are 14 typical schemes
of processing available.
! It is possible to build customized
! All modules work simultaneously in

! All options are adjustable in
real-time while listening to
the output.
! Each module is represented
by a separate window with
a number of basic and
professional controls.

Sound Cleaner consists of 19
processing modules including:
! 8192 independent band
graphical equalizer with
automatic and manual
! 2048 manually adjustable
equalizer sliders which
allow the user to suppress
narrow bands (2.5 Hz) by 72
dB down, it is also possible
to operate sliders by group.

! Adaptive broadband noise
filter cancels the most kinds
of home/office equipment
noise. The broadband
noise is suppressed down
by 10-20 dB.

! Adaptive frequency
compensation filter. 8192
taps allow suppression of
many mixed types of

! 4 adaptive stereo filters in time
and frequency domain are
effective against distributed
interference (radio, TV,
concert, bar environment) or
point-source noise.

! Adaptive inverse filter
automatically suppresses
narrowband noise - highly
effective against reverberation
and non-stationary hindrances.

! Pulse-like interference filter

! Dynamic processing /
automatic gain control module
successfully deals with the
recordings of speech at
different volume levels

! The user has the ability to see
waveforms and FFT spectrums
of the source signal and of the
processed one.

! Sound Stretcher module for
playback speed adjustment.
Playback speed can be increased
or decreased up to 2-3 times
without voice pitch distortion or
speech quality loss.

! Sound file (*.wav) or real-time
audio stream can be processed.
The files can be listen to and
stored at the same time.
! Advanced playback
functionality: loop, search,
precise pointer setting.

! Volume control and pseudostereo mode sound playback, for
more comfortable listening.

! Amplification range is -60...+60dB.
When the signal level after
processing drops, a higher gain
setting value is useful.

Eliminates different types of noises and distortions:

! Broadband and narrowband noise, stationary and nonstationary noise can be eliminated.
! From such sources as: telephone lines, engine, home/office
appliances, industrial equipment, street, aircraft engine,
power supply, room echo and reverberation.


19 processing modules


All modules work simultaneously


All controls can be adjusted in real time


The Sequence of the modules can be edited by user


14 pre-defined processing schemes give guidance in
determining what noise is present and how to remove it

Self-adjusting improvement of voice quality and intelligibility
Removal of background noise and interferences
Tonal distortion suppression up to 70 dB
White noise reduction 12-30 dB
Manually adjusted noise reduction characteristics for fine
! Selectable signal bandwidth
! Works on standard PC

Speech Technology Center
St.Petersburg, Russia

" Tel +7 812 3310665

# Fax +7 812 3279297

German office:
Speech Tech GmbH
Saarbr├╝cken, Germany

" Tel +49 681 9655709

# Fax +49 69 25577077

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