Dual Microphone Array

Microphone array solution (MAS) of speech enhancement can be used for reduction of external hindrances and ambient noises in speech source signal.

The technique uses dual microphones array configurations in its simplest form. By using acoustical beam-forming techniques, the microphone array can "focus" on the speaker's position.

By knowing the speaker's position, output from individual microphone can be combined in such a way as to add the separate signal contributions while canceling the noise contributions.

Microphone array solution can be effectively used: ￭ Wireless telephony systems; ￭ Mobile communications systems; ￭ Voice over IP (VoIP) telephony; ￭ And other voice communications systems.

Here are some key features of "Dual Microphone Array":

￭ Support 2 microphones configurations; ￭ Directional microphones: unidirectional configuration; ￭ Distance between microphones not less 4 cm; ￭ Far-field pickup up to 2 meters; ￭ Noise suppression of stationary noise up to 15 db and up to ￭ 18 db for non-stationary noise; ￭ High quality of speech enhancement; ￭ Low level of speech distortion; ￭ Fast adaptation to changing of external noises; ￭ Easy integration with target applications.

Requirements:

￭ Pentium-III class CPU; ￭ 64 Mb RAM; ￭ Soundcard; ￭ Headphones/Speakers; ￭ Microphone.

￭ Windows PCM, 8, 16, 32 bits linear; ￭ 8 bits A/mu-Law PCM encoder; ￭ Microsoft ADPCM (MS ADPCM); ￭ Intel ADPCM (IMA ADPCM); ￭ Microsoft ACM GSM 6.10 (ACM Waveform)

Limitations:

￭ 30 days trial ￭ Only 25 seconds can be processed