Speech Enhancement 2.0 is a Audio Utility product from grittec.com, get 5 Stars SoftSea Rating, GritTec's Noise Cancellation technology of speech enhancement is used for reducing the external hindrances and background noises in speech signal. NC can be used as for the selection of speech signal, so and for the selection of background noises. NC is recommended to use in case of an amount of hindrances is unknown beforehand or it is impossible in the evident type to select 'point' source of hindrances (absent-minded hindrance). Filter noise cancellation is automatically adapted under all types of surrounding hindrances and selects a refined of speech signal.
GritTec's Noise Cancellaion can be impactfully applied for:
* suppression of street noises;
* suppression of office noises (fan noise, computer noise, background speech and so on);
* suppression of a various sort of mechanical noises, such as noises of avto-moto technics;
* suppression of industrial noises;
* suppression of channel distortions and noises arising in a consequence of coding and transfer of a speech signal on analogue and digital communication channels (VoIP);
* suppression of other broadband noises.
Applications
* Wireless telephony systems;
* VOIP telephony;
* Voice messaging services (voice mail);
* Mobile phones or without "hands free" system;
* Call service centers.
Features
* High quality of speech enhancement;
* Low level of speech distortion;
* Operation with low level SNR;
* Separation as cleaned speech signal, so and background noise;
* Three modes adaptation to background noises;
* Controlled level of noise suppression in speech, including broadband color noises up to - 60 dB;
* Possibility of using a graphic equalizer for removing the stationary hindrances;
* Easy integration with target applications.
* Signal requirement
* Signal format: 16-bits linear;
* 6 kHz, ..., 48 kHz sampling rate.
Availability
* PC demo for MS Windows;
* SDK for win32, win64 platforms with object code or ANSI C++ float point code is available on request;
* Portability to any DSP or ARM platforms.
Multi-microphone solution (MMS) of speech enhancement can be impactfully used when noise from many different sources needs to be canceled.
MMS can be used as for separation of speech signal, so and for non-speech signals.
MMS is recommended to use if it is known beforehand that an amount of hindrances and sources of the noises is limited. And they can be presented in the manner of "point" sources of radiation, for instance, noise of car engine, noise of ventilator, enclosed radio or music of TV.
In its simplest form the technique uses 2 microphones. Speaker is recorded synchronous with the source of hindrance (noise). The first microphone bases near by speaker, but the second one bases near by source of hindrance or noise.
Thereby, the first microphone records signal "hindrances+ speech" and signals "hindrances" are recorded in all following microphones. Then filter MMS is automatically adapted and selects refined speech signal.
Sometimes single-microphone solution (SMS) and MMS are used together. At first MMS solution is used for totally suppress of hindrances and noises "point" sources. Then in addition it is used SMS solution to suppress all absent-minded hindrances and all remainder of "point" hindrances, which were not be able to suppress of MMS solution totally.
Multi-microphone solution can be impactfully used:
* Wireless telephony systems;
* Mobile phones or without "hands free" system.
Features
* High quality of speech enhancement;
* Low level of speech distortion;
* Fast adaptation to changing of external noises;
* Controlled level of noise suppression in speech;
* Easy integration with target applications.
* Signal requirement
* Signal format: 16-bits linear;
* 8 kHz, ..., 32 kHz sampling rate.
Availability
* DLL libraries for MS Windows;
* PC demo for MS Windows is available on request;
* Portability to any DSP, ARM or RISC platform.
GritTec's Dual microphone array solution of speech enhancement is used for the suppression of external hindrances and surrounding noises in chosen direction source of the speech. The sources of external hindrances can be an external noise of car, speech of collocutor, music and any other sounds, coming from directions, different from direction of the chosen source of the speech. Suppression of external hindrances is descended by mean of the acoustical beam-forming - directed diagrams of directivity of microphone array. By using acoustical beam-forming techniques, the microphone array can "focus" on the speaker's position.
Applications
* Car audio garniture (Car kits);
* Plane audio garniture;
* Mobile communications systems (mobile VoIP);
* And other voice communications systems.
Features
* Support 2 microphones configurations;
* Directional microphones: unidirectional configuration (omni-uni directional);
* Distance between microphones not less 0.025 meters;
* Distance to the speaker not less 0.2 meters (up to 5 meters);
* Choice of a direction of a speech source: hand control (Default: direct);
* Noise suppression not less 15 db;
* Low level of speech distortion;
* Delay of the algorithm: 0 ms;
* Fast adaptation to changing of external noises;
* Easy integration with target applications.
Signal requirement
* Signal format: 16-bits linear;
* Sampling rate: 6 kHz, ..., 32 kHz.
Availability
* PC demo for MS Windows;
* SDK for win32, win64 platforms with object code or ANSI C++ float point code is available on request;
* Portability to any DSP, ARM platform. The license of this audio & mp3 software is Free Trial Software, the price is $35.00, you can free download and get a free trial before you buy. If you want to get a full or nolimited version of Speech Enhancement, you can buy this audio & mp3 software.