Abstract: In the receive subsystem, the analogue-to-digital converter (40) works on the output of the low-noise amplifier (33), at a chosen rate (F), which corresponds to a bandwidth sampling. The processing stages comprise a custom circuit (5), with * an input memory (510) arranged to contain N successive digital samples, renewed at the chosen rate in blocks of M samples, * a complex digital low-pass filtering function (511, 512), of chosen cut-off frequency, operating on the input memory to supply N filtered digital samples (515), * an M-periodic summing function (531) on the N filtered digital samples, supplying M filtered and summed digital samples (533), * an M?M discrete Fourier transform stage (55), operating on these M filtered and summed digital samples, the digital signals on the M outputs (559) of the Fourier transform representing M separate channels, of width defined by the cut-off frequency of the abovementioned low-pass filter.

Abstract: The invention provides a portable device for recognizing and/or reconstructing speech by ultrasound probing of the vocal apparatus, the device including at least one ultrasound transducer (20) for generating an ultrasound wave and for receiving a wave reflected by the user's vocal apparatus, and analysis means for analyzing a signal generated by the ultrasound transducer, wherein the device includes locating means (21, 23) for determining the position of the ultrasound transducer relative to the skull of the user.

Abstract: The disclosure relates to a method for locating a mobile station inside an area covered by a wireless telephony cellular network in which the mobile station operates. The method includes using the mobile station to measure the received power on at least seven different communication channels of the network (step 200) and then locating the station according to the measurements and relevant predetermined information of the correspondence between received power on the channels and location within the covered area. The predetermined information can include power levels previously measured on the channels at different locations and stored in a database, in which case the station is located by comparing the measurements with the contents of the database. The method also enables greater locating accuracy, even inside buildings.

Abstract: In the receive subsystem, the analogue-to-digital converter (40) works on the output of the low-noise amplifier (33), at a chosen rate (F), which corresponds to a bandwidth sampling. The processing stages comprise a custom circuit (5) with * an input memory (510) arranged to contain N successive digital samples, renewed at the chosen rate in blocks of M samples, * a complex digital low-pass filtering function (511, 512), of chosen cut-off frequency, operating on the input memory to supply N filtered digital samples, * an M-periodic summing function (531) on the N filtered digital samples, supplying M filtered and summed digital samples (533), * an M1M discrete Fourier transform stage (55), operating on these M filtered and summed digital samples, the digital signals on the M outputs (559) of the Fourier transform representing M separate channels, of width defined by the cut-off frequency of the abovementioned low-pass filter.