Abstract: A foldable wheelchair ramp is disclosed having a mountable base, a first ramp section and a second ramp section. In an extended configuration, the first and second ramp sections form a single, continuous ramp for facilitating wheelchair access to vehicles. For convenient storage, the first and second ramp sections fold with respect to each other and preferably retract into the vehicle floor such that, in the folded configuration, the top surface of the second ramp section lies substantially in the same plane as the vehicle floor. A linking assembly is provided to facilitate and control the folding of the ramp sections. For safety purposes, the ramp also includes a lid that covers the gaps between the ramp and the vehicle floor when the ramp is in an extended position.

Abstract: There is described a communication system in which data is received by and/or transmitted to a telecomunications apparatus using an acoustic data channel. In embodiments, The data is encoded within the audio track of a media broadcast or other public broadcast. The invention has particular, but not exclusive, relevance to a cellular communication system. There are also described acoustic position detection systems for determining the position of a telecomunications apparatus.

Abstract: An FM radio receiver with a discriminator having connected thereto a plurality of bandpass filters, each tuned to pass a different portion of the audio spectrum from the discriminator, and circuitry connected to the bandpass filters for selecting the filter with the lowest output signal which is an indication of the amplitude of the noise and, hence, the quality of the signal being received by the receiver.