Active Noise Cancellation/Equalization

Leaff is actively working on several algorithms for noise cancellation in different scenarios:

automotive: noise reduction with beamforming for hands-free speech communications;
narrow-band noise equalization: creation of "quiet zones" reducing the low frequency tonal noise induced by engines (automobiles, yacths, helicopters, airplanes etc.).

Porting of the algorithms is available for DSP (SHARC, Blackfin) and for PC (NU-Tech).

Application: Luxury Yachts

BJ44-PH is a high quality daughter board specifically designed and used for ANC applications in critical scenarios where accuracy and excellent microphone preamplifiers are mandatory.

The algorithm reaches a remarkable attenuation creating a "Comfort zone" of about 1 meter around the head. The noise has a tonal charachteristic with components at very low frequencies.

DEMO: AVAILABLE

2 x active bass units
1-4 x high quality microphones
1x NU-Core + BJ44-PH

Application: Speech Reinforcement for Automotive Application

Improves communication between the front and the rear passengers in large motor vehicles.

The algorithms involved are:

Echo cancellation (AEC)
Acoustic Feedback Cancellation (AFC)
Noise reduction (NR)

Target Platforms

efficient C implementation
efficient DSP native implementation

Application: Headrest Noise Cancellation for Automotive/Aircraft Application

Improves intra-cabin communications, speech intelligibility and travelling comfort creating a zone of "silence" around the passenger's head.

Performances can vary depending on the noise characteristic, space limitations - i.e. loudspeaker size, sensor positioning etc..

Algorithms can be tuned to reach best results in compliance with customer constraints.

Target Platforms

efficient C implementation
efficient DSP native implementation