Enrique Masgrau

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Robust beamforming is a challenging task in a number of applications (radar, sonar, wireless communications, etc.) due to strict restrictions on the number of available snapshots, signal mismatches, or calibration errors. We present a new approach to adaptive beamforming that provides increased robustness against the mismatch problem as well as additional(More)
A novel analysis of FxLMS convergence when the reference signal is deterministic is presented in this paper. The simple case of a sinusoidal reference is considered first, to be later extended to any combination of multiple sinusoids. In both cases, we derive an upper bound for the algorithm step size which ensures convergence. In the derivation of this(More)
In this paper, a robust speech recognition system for videoconference applications is presented based on a microphone array. By means of a microphone array, the speech recognition system is able to know the position of the users and increase the signal-to-noise (SNR) ratio between the desired speaker signal and the interferences from the other users. The(More)
A speech reinforcement system is presented to improve communication between the front and the rear passengers in large motor vehicles. This type of communication can be difficult due to a number of factors, including distance between speakers, noise and lack of visual contact. The system described makes use of a set of microphones to pick up the speech of(More)
Passengers communication inside a car can be improved by using a speech reinforcement system. This system picks up the speech of each passenger, amplifies it and plays it back into the cabin through the loudspeakers of the car. Due to the electro-acoustic coupling between loudspeakers and microphones, a closed-loop system is created. To avoid the risk of(More)
A simplified algorithm is presented for computing the gradient in adaptive IIR lattice filters. For a filter with N zeros and N poles, this algorithm requires only order Ncomputations and it is shown to be completely equivalent to the previously proposed formulation which has a complexity of order N Z . Manuscript received May 7, 1990; revised October 4 ,(More)
A Cabin Car Communication System (CCCS) has the goal of improving the communication among passengers inside the car. Wind, road and engine noise, the distance between passengers and other factors make difficult the communication inside vehicles. The driver must often look away from the road and passengers move out of normal seating positions. The CCCS makes(More)
This paper presents a cabin car communication system (CCCS) to improve the communication among passengers inside a car. Noise, distance between speakers and many other factors make difficult to maintain a conversation inside a car. The CCCS picks up the speech of each passenger, amplifies it, and uses the car loudspeaker system to return it into the cabin.(More)