Demodulation of angle-, frequency- or phase- modulated oscillations

HELECTRICITY H03Electronic circuits H03DDEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER

H03D3/00Demodulation of angle-, frequency- or phase- modulated oscillations

H03D3/001Details of arrangements applicable to more than one type of frequency demodulator H03D3/002Modifications of demodulators to reduce interference by undesired signals H03D3/003Arrangements for reducing frequency deviation H03D3/004wherein the demodulated signal is used for controlling an oscillator H03D3/005wherein the demodulated signal is used for controlling a bandpass filter H03D3/006by sampling the oscillations and further processing the samples H03D3/007by converting the oscillations into two quadrature related signals H03D3/008Compensating DC offsets H03D3/009Compensating quadrature phase or amplitude imbalances H03D3/02by detecting phase difference between two signals obtained from input signal H03D3/04by counting or integrating cycles of oscillations H03D3/06by combining signals additively or in product demodulators H03D3/08by means of diodes H03D3/10in which the diodes are simultaneously conducting during the same half period of the signal H03D3/12by means of discharge tubes having more than two electrodes H03D3/14by means of semiconductor devices having more than two electrodes H03D3/16by means of electromechanical resonators H03D3/18by means of synchronous gating arrangements H03D3/20producing pulses whose amplitude or duration depends on phase difference H03D3/22by means of active elements with more than two electrodes to which two signals are applied derived from the signal to be demodulated and having a phase difference related to the frequency deviation H03D3/24Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits H03D3/241the oscillator being part of a phase locked loop H03D3/242combined with means for controlling the frequency of a further oscillator H03D3/244combined with means for obtaining automatic gain control H03D3/245using at least twophase detectors in the loop H03D3/247using a controlled phase shifter H03D3/248with means for eliminating interfering signals H03D3/26by means of sloping amplitude/frequency characteristic of tuned or reactive circuit H03D3/28Modifications of demodulators to reduce effects of temperature variations H03D3/30by means of transit-time tubes H03D3/32by deflecting an electron beam in a discharge tube H03D3/34by means of electromechanical devices