Loudspeaking telephone with a variable gain circuit
Low complexity echo compensation
Low cost acknowledge-back system for a pager using existing...
Low cost adjustable (base) stand
Low cost teleprocessing system
Low cost user reprogrammable communication system
Low distortion signal oscillator
Low frequency discriminator circuit
Low harmonic telephone ringing generator
Low pass filtering device with integrated insulator and...
Low power consumption relay switching circuit for use in...
Low power control apparatus for a coin operated telephone
Low power dialer
Low resistance origination scan circuit
Low-pass filters for splitterless pots and data transmission
Lpc-based dtmf receiver for secondary signalling