Abstract: Several forms of a novel amplitude-modulated (AM) signal format are disclosed. Circuits of several types for generating the desired special vestigial-sideband (SVSB) AM waveforms are discussed. The principal form of the SVSB modulation provides for a reduction in transmitted signal bandwidth compared with standard double-sideband techniques plus very linear amplitude characteristics with simple synchronous detectors. Circuits according to the invention may also include means for dynamically varying signal bandwidth to accommodate special applications.

Abstract: Several circuit detectors and noise reduction networks with circuit detectors are disclosed. Detectors and networks according to the invention generally include a discharge diode placed within a feedback loop of an operational amplifier so that the hold time of the system is unaffected by the detector level. Circuits according to the invention may also include a conductor to provide a dynamically controlled charge and/or discharge path in combination with an active signal amplifying device.