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Intelligent microphone technology

- NTT‘S Proprietary Hybrid Structure of Beam Forming and Spectrum Filtering -

What can be done

  • Drastic improvement of voice recognition rate without sacrificing sound quality.
  • Achieving high quality extraction in the noisy environment.
  • Low cost solution: NTT IM realizes spectral filtering based on spectrum estimation by direction estimation with only 3 microphones.

[Fig.]MPEG-4 ALS-compliant codec technology

Examples used in products

(1)Automotive Solution: Microphone Module for Car Navigation System

Automobile type

Automotive Solution: Microphone Module for Car Navigation SystemMovie 00:02:59

NTTs Intelligent Microphone shows very much Superior performance under the noisy environment caused by air conditioner, higher speed driving.

(2)Auto tracking Solution: IoT home appliances system and robot.

Auto tracking type

Auto tracking Solution: IoT home appliances system and robotMovie 00:03:00

High performance noise suppression that shows high speech recognition rate under various sound/noise/echo environments. It has been verified by various speech recognition engines such as Google, Siri, ALEXA. Spectral filtering based on spectrum estimation by direction estimation is realized with only 3 microphones.

(3)Tablet Solution: Karaoke remote control.

Tablet type

Tablet Solution: Karaoke remote controlMovie 00:03:05

It is possible to extract only the necessary sound even in the large volume of 100 DB such as karaoke box and night club.

(4)Headset Solution: At noisy construction sites and factories

Headset type

Headset type

Press noise in the factory and noise such as heavy machinery can also be suppressed, so comfortable speech and speech recognition on site.

Offering

We can provide Library Software for your designated chip. Software is tuned for your required application.

[Fig.]MPEG-4 ALS-compliant codec technology

Suggested Requirements

(1)Required specification for Chip

2 microphones:20 to 30 MIPS, Memory 75kbytes

3 microphones:50 to 100 MIPS, Memory 85kbytes

(more ability is required if you utilize echo canceller or direction estimation function)

(2)Required specification for Module

At least 3 microphone is needed if you are to use “Direction Estimation”. Quality variation within 1dB is needed between plural microphones.

Ordinal Amplifier, and Codec is needed.

(3)Required specification for Android

At least 3 microphone is needed if you are to use “Direction Estimation”.

Quality variation within 1dB is needed between plural microphones.

CPU:Coretex A series or more

Comparative evaluation & Test results

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