H - Electricity – 04 – R
Patent
H - Electricity
04
R
H04R 25/00 (2006.01)
Patent
CA 2385812
Change over of the sound receiving characteristic of a hearing aid having spaced apart first and second microphone means (Fmic, Bmic) between the omnidirectional characteristic and a directional characteristic is effected by controlled attenuation and time or phase delay of signals derived from the signals (X front, X back) from the first and second microphone means before forming and overall combined signal (Y) to be supplied to the hearing aid signal processor, whereby the overall combined signal (Y) is determined by Y = X front *(1 - omni * e-j.omega.T) + X back * (omni -e- j.omega.T), where omni is an adjustable attenuation control parameter preferably in the range 0 <= omni <= 1 and T is a time delay corresponding to the acoustical delay between the first and second microphone means. In result, the change between the omnidirectional characteristic and any desired form of the directional characteristic is effected as a smooth change-over substantially without affecting phase relationship, time delay and amplitude characteristic of the hearing aid.
L'invention concerne le changement de la caractéristique de réception de son d'une aide auditive équipée d'un premier et d'un second microphone séparés (Fmic, Bmic), passant de l'état de caractéristique omnidirectionnelle à l'état de caractéristique directionnelle, changement obtenu par une atténuation commandée et un retard temporel ou de phase de signaux dérivés des signaux (Xavant, Xarrière) du premier et du second microphone, avant de former un signal global combiné (Y) à transmettre au processeur de signaux de l'aide auditive. Le signal global combiné (Y) est déterminé par Y = Xavant * (1 - <i>omni</i> * e<-j omega T>) + Xarrière * <i>omni</i> - e<-j omega T>), <i>omni</i> étant un paramètre de commande d'atténuation réglable correspondant, de préférence, à 0 </= <i>omni</i> </= 1, et T étant un retard temporel correspondant au retard acoustique entre le premier et le second microphone. Par conséquent, le changement d'état de la caractéristique omnidirectionnelle à toute forme désirée de caractéristique directionnelle représente un léger changement n'affectant sensiblement pas la relation de phase, le retard temporel et la caractéristique d'amplitude de l'aide auditive.
Jensen Lars Baekgaard
G. Ronald Bell & Associates
Widex A/s
LandOfFree
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