Patent
Direct reading displays for indicating frequency shift of a modulatable carrier oscillator
Edmund I Schwartz,Philip Basse +1 more
TLDR
In this paper, a frequency deviation monitor utilizes a reversible or up-down counter for determining the amount of frequency shift of a carrier oscillator signal, which is used to count down a reversible counter having the unshifted frequency stored therein.Abstract:
A frequency deviation monitor utilizes a reversible or up-down counter for determining the amount of frequency shift of a carrier oscillator signal. A modulating signal is peak detected and thence applied to the carrier oscillator to shift the output frequency. This shifted frequency is used to count down a reversible counter having the unshifted frequency stored therein. The difference between the counts during a predetermined time interval is determinative of the frequency deviation.read more
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Patent
Frequency bandwidth tuning system and method
TL;DR: An electronic system for scanning across a range of received signals and aining a digital representation of a predetermined position, for example, the mid-point, of the received signal, without having to ascertain directly the frequency at said predetermined position as mentioned in this paper.
Patent
Frequency responsive apparatus
Russel M C B,Desborough C L +1 more
TL;DR: In this article, a bidirectional digital ring counter is used to measure the change in the transducer frequency over two successive time intervals, in opposite counting directions, with the length of the time intervals being determined by the transducers' frequency and the counting rate of the counting means determined by a reference frequency.
Patent
System for determining the presence of a given frequency in an incoming signal
TL;DR: In this paper, an incoming signal wave is converted into a square wave fed in parallel to a pair of exclusive-OR gates each also receiving a reference square wave of frequency F 0, the two reference waves being in quadrature with each other.
Patent
Digital circuit for measuring relative frequency in separate pulse trains
TL;DR: In this article, a prescaler circuit was proposed for reducing the frequency of the input pulse train to a level suitable for a digital period-measuring circuit, followed by a frequency-multiplier circuit that produces the reference frequency used to measure the period in the periodmeasurement circuit.
Patent
Remote display of percentage modulation data obtained at a transmitter site
TL;DR: In this article, a method and apparatus for the remote display of percentage modulation data obtained at a transmitter site is described, where a modulation monitor at the transmitter site produces a positive excursion of the audio wave modulation of a carrier wave proportional to percentage modulation of the carrier wave.
References
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Patent
Frequency modulated transmitter monitor
TL;DR: In this article, a radar or radio altimeter FM signal is adjusted in frequency sweep or the tuning of a resonator or tuned circuit adjusted until the maximum or minimum frequency of the sweep coincides with that of the tuned circuit as shown by a train of single and not double pulses appearing after detection on an oscilloscope during the time base scan.