Abstract A system for analyzing and displaying in real time the frequency components of a complex analog signal. In a preferred embodiment, a tracking filter is periodically swept over a frequency band of interest by a sine wave received from an oscillator the operation of which is in turn controlled by a sawtooth wave generator. The output of the tracking filter is employed to intensity modulate a light beam. The modulated beam is directed to the mirror of a galvanometer, and, when this mirror is oscillated by the output of the sawtooth wave generator, the beam reflected therefrom is swept in cyclic fashion laterally across a moving film or sensitized paper to develop thereon a record of the frequency characteristics of the input energy.
Inventors
👤 Arne J Herleikson
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-25 20:01
CPC Classifications
G; G01; G01R; G01R23/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A system for displaying in real time frequency components of a complex input signal of analog form, said system comprising: means for separating said input signal into a plurality of discrete frequency components, said separating means including a tracking filter to which said input signal is applied, a sawtooth wave generator, a voltage-controlled sine wave oscillator receiving the output of said sawtooth wave generator, and means for applying the output of said voltage-controlled oscillator to said tracking filter to cause the latter to periodically sweep over a predetermined frequency band; a light source having an output in the form of a narrow beam; means for applying the output of said tracking filter to intensity-modulate said light beam; a sensitized recording medium; and means for applying the output of said sawtooth wave generator to cyclically deflect said intensity-modulated light beam across said recording medium.
Claim 2
Independent Claim
143 words
A system for displaying in real time frequency components of a complex input signal of analog form, said system comprising: means for separating said input signal into a plurality of discrete frequency components, said separating means including a tracking filter to which said input signal is applied, a sawtooth wave generator, a voltage-controlled sine wave oscillator receiving the output of said sawtooth wave generator, and means for applying the output of said voltage-controlled oscillator to said tracking filter to cause the latter to periodically sweep over a predetermined frequency band; a light source having an output in the form of a narrow beam; means for applying the output of said tracking filter to intensity-modulate said light beam; a sensitized recording medium; and means for applying the output of said sawtooth wave generator to cyclically deflect said intensity-modulated light beam across said recording medium.