Innovaradio Sa

Avatronics Sarl

Avatronics Sa

Jeyran Hezaveh

Ali Asghar Talebi

Amirhooshang Farahanisamani

Amirhooshang Farahani Samani

Alexander Greber

Ali Talebi

Amir Hooshang Farahani Samani

Finn Moller

An active noise cancellation system () for cancelling environment noise perceived by a driver or passenger seated in a seat () mounted in a cabin of a vehicle, in combination with said seat, the seat comprising a seat cushion (), a seat back () coupled to the seat cushion at a bottom end and extending upwards to a seat shoulder (), and a headrest () coupled to the seat back, extending upwardly from the seat shoulder, the active noise cancellation system comprising an active noise cancellation circuit (ANC) (), a plurality of microphones () mounted in the headrest and connected electrically to the ANC, and a plurality of speakers () mounted in the seat and connected electrically to the ANC circuit. The plurality of microphones comprises at least one first microphone mounted on a right side of the headrest and at least one second microphone mounted on a left side of the headrest, and the plurality of speakers comprises at least one first speaker mounted in the seat shoulder on a left side and at least one second speaker mounted in the seat shoulder on a right side, the right speaker configured to generate a noise cancellation sound from a noise signal picked up by the right microphone processed by the ANC circuit and the left speaker configured to generate a noise cancellation sound from a noise signal picked up by the left microphone processed by the ANC circuit.

In-seat active noise cancellation system for moving vehicles

An active noise cancellation system comprising an active noise cancellation circuit connected to a microphone arranged to sense environmental noise, the active noise cancellation circuit comprising: &#x2014;an analog-to-digital converter (ADC) arranged to convert the sensed environmental noise to a digital environmental noise signal, &#x2014;a prediction filter configured for predicting a plurality D of inverted digital environmental noise samples and generating a digital inverted environmental noise signal, &#x2014;a digital-to-analog converter (DAC) to convert the digital inverted environmental noise signal to an analog inverted environmental noise signal for cancelling the environmental noise.

Active noise cancellation system for headphone

The present invention relates to the control of power amplifiers in order to enhance the efficiency of the amplifier by tracking the envelope of input signal and applying the same envelope into the drain voltage of a last stage power transistor. This invention can be used in each and every wireless communication transmitter, since there is definitely a power amplifier in the last part of the transmitter before the antenna, and every power amplifier has limited power performance, depending on type of modulation, due to its input-output curve. We are aiming to enhance the power utility of power amplifiers in different applications through introducing a new method and circuit for supplying power into a power amplifier, wherein the power supplied to the drain of the power amplifier is made to follow the envelope of the transmitted RF signal. Embodiments of the invention provide for a drain power supply module to drive the drain of a power amplifier, wherein an array of parallel amplifiers is controlled, depending on the envelope, to switch at different phases.

High-frequency drain power supply to decrease power dissipation in class-AB power amplifiers

The present invention concerns the field of power amplifiers and in particular the enhancement of the performance of the amplifier by a feedback loop acting on the input signal. It describes a method for linearizing a power amplifier circuit having a digital base-band input signal, a power output signal, a power amplifier and a linearizer module (LM), this method comprising the steps of: extracting a feedback signal from the power amplifier (PA) output signal, down-converting the feedback RF-signal to feedback IF-signal, filtering the feedback IF-signal with a band-pass filter, A/D converting the filtered feedback IF-signal into a feedback digital signal, converting the feedback digital signal into frequency-domain using fast-Fourier transform FFT on a block of n-samples to obtain a feedback FB-FFT block, converting the input base-band digital signal into frequency-domain using fast-Fourier transform FFT on a block of n-samples to obtain a input FF-FFT block, dividing the input FF-FFT block with the feedback FB-FFT block to obtain FFT correction samples blocks, averaging at least two blocks of FFT correction samples to obtain FFT correction coefficient values, applying the FFT correction coefficient values to a digital complex multiplier, converting the output of the multiplier from frequency domain into time domain with an inverse FFT module to obtain a corrected digital input signal, converting the corrected digital input signal to analog IF signal with a digital to analog converter to obtain a corrected IF input signal, applying the band-pass filter to the corrected IF input signal, up-converting the filtered corrected IF input signal to obtain a corrected RF input signal, applying the corrected RF input signal to the power amplifier.

Adaptive digital pre-distortion method and device to enhance the power utility of power amplifiers in wireless digital communication applications

The present invention concerns the field of power amplifiers and in particular the enhancement of the performance of the amplifier by a feedback loop acting on the input signal. We present a method for linearizing a power amplifier circuit having as input signal a digital base-band input signal, (x), a power output signal), a power amplifier (PA) and a linearizer module (LM).

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Lausanne, Switzerland

Jeyran Hezaveh