Philips Electronics
Low voltage transmission circuits with dialler interface
Philips Electronics
Low voltage versatile telephone transmission circuit with dialler interface
Philips Electronics
Voice switched speakerphone IC
Telefunken Licences GmbH
Quasi Parallel Sound Processing with Quadrature Intercarrier Demodulator
Philips Electronics
Speech and loudspeaker amplifie IC with auxiliary inputs/outputs and analog multiplexer
Unspecified
Tone Ringer IC (14-Pin Plastic Package TO-116)
Philips Electronics
Versatile telephone transmission circuit with dialler interface
Philips Electronics
Speech and listening-in IC