BBC Radio Leicester high point in Charnwood Forest, part of the National Forest. Since 6 December 2002, the station's DAB signal has come from the NOW Digital East Midlands (NDEM) Leicester 11B multiplex, which comes from Copt Oak and Houghton on the Hill. The Waltham transmitter and Houghton-on-the-Hill have a Digital One multiplex and Waltham has a BBC National DAB multiplex. The Copt Oak transmitter also broadcasts Gem 106. The majority of the station's programming is produced and broadcast from Leicester. During off-peak hours, BBC Radio Leicester also carries regional programming for the Midlands and East Midlands regions, produced from sister stations BBC
Time reversal signal processing time reversal (using a negative time) of that solution is also a solution. This occurs because the standard wave equation only contains even order derivatives. Some media are not reciprocal (e.g. very lossy or noisy media), but many very useful ones are approximately so, including sound waves in water or air, ultrasonic waves in human bodies, and electromagnetic waves in free space. The medium must also be approximately linear. Time reversal techniques can be modeled as a matched filter. If a delta function is the original signal, then the received signal at the TRM is the impulse response of the