Spectrum analyzer with simultaneous display for plural frequency bands

Claim 2

In combination: a plurality of sources of respectively different frequency signals; selection means connected to said plurality of sources for selecting the signal from any one of said plurality of sources; frequency shifting means connected to said selection means for frequency shifting an input signal by an amount equal to the frequency of the signal selected by said selection means; and means connected to said frequency shifting means for scanning a band of frequencies in the output signal from said frequency shifting means to generate a frequency spectrum signal.

Claim 3

In combination: a plurality of sources of respectively different frequency signals; means for generating signals defining time slots; selection means controlled by said signals defining time slots for selecting the output signal of any one of said plurality of sources for each time slot; a variable frequency oscillator controlled by said signals defining time slots for generating a signal which rises in frequency from a lower limit frequency to an upper limit frequency during each time slot; first time-shared means connected to said selection means and to said variable frequency oscillator for scanning a band of frequencies in an input signal to generate a frequency spectrum signal during each time slot; and second time-shared means connected to said first time-shared means for displaying the frequency spectrum signal generated during each time slot.

Claim 4

In combination: a plurality of sources of respectively different frequency signals; means for generating signals defining time slots; selection means controlled by said signals defining time slots for selecting the output signal of any one of said plurality of sources for each time slot; a variable frequency oscillator controlled by said signals defining time slots for generating a signal which rises in frequency from a lower limit frequency to an upper limit frequency during each time slot; first time-shared means connected to said selection means and to said variable frequency oscillator for scanning a band of frequencies in an input signal to generate a frequency spectrum signal during each time slot; and second time-shared means connected to said first time-shared means for displaying the frequency spectrum signal generated during each time slot.

Claim 5

In combination: a plurality Of sources of respectively different frequency signals; time-shared means connected to said sources for generating frequency spectrum signals for a plurality of frequency bands in an input signal; wherein said plurality of frequency bands are of the same bandwidth and each frequency band is related to the output frequency of one of said sources; a plurality of bias signal sources of respectively different bias levels; and means connected to said bias sources and to said time-shared means for simultaneously displaying said frequency spectrum signals on selected portions of a display surface.

Claim 6

In combination: a plurality Of sources of respectively different frequency signals; time-shared means connected to said sources for generating frequency spectrum signals for a plurality of frequency bands in an input signal; wherein said plurality of frequency bands are of the same bandwidth and each frequency band is related to the output frequency of one of said sources; a plurality of bias signal sources of respectively different bias levels; and means connected to said bias sources and to said time-shared means for simultaneously displaying said frequency spectrum signals on selected portions of a display surface.

Claim 7

In combination: a plurality of sources of signals of respectively different frequencies; means for generating pulses at a selected frequency for defining time slots; a counter connected to said means for generating pulses for counting said pulses and for generating counter output signals at one or more counter output ports; time-shared means for generating frequency spectrum signals comprising: first selection means connected to said output ports of said counter and to said sources for selecting the source determined by said counter output signals appearing at said output ports of said counter for each time slot; and means connected to said first selection means for generating a spectrum signal during each time slot by scanning a selected band of frequencies in an input signal; a plurality of bias signal sources of respectively different bias levels; and means connected to said bias signal sources, said time-shared means for generating frequency spectrum signals, and to said output ports of said counter for generating a simultaneous display of said frequency spectrum signals on selected portions of a display surface.

Claim 8

In combination: a plurality of sources of signals of respectively different frequencies; means for generating pulses at a selected frequency for defining time slots; a counter connected to said means for generating pulses for counting said pulses and for generating counter output signals at one or more counter output ports; time-shared means for generating frequency spectrum signals comprising: first selection means connected to said output ports of said counter and to said sources for selecting the source determined by said counter output signals appearing at said output ports of said counter for each time slot; and means connected to said first selection means for generating a spectrum signal during each time slot by scanning a selected band of frequencies in an input signal; a plurality of bias signal sources of respectively different bias levels; and means connected to said bias signal sources, said time-shared means for generating frequency spectrum signals, and to said output ports of said counter for generating a simultaneous display of said frequency spectrum signals on selected portions of a display surface.

Claim 9

The combination of claim 4 wherein said means for generating a simultaneous display comprises: second selection means connected to said output ports of said counter and to said bias signal sources for selecting the bias signal source determined by said counter output signals at said output ports of said counter for each time slot; and time-shared means connected to said second selection means and connected to said time-shared means for generating frequency spectrum signals for generating a display of the respective frequency spectrum signals on different portions of an oscilloscope screen during the respective time slots.

Claim 10

In combination: a generator of a selected frequency signal; a first frequency multiplier connected to said generator and having a first selected multiplier factor; a second frequency multiplier connected to said generator and having a second selected multiplier factor; and means connected to said first and second frequency multipliers for generating a first and a second spectrum signal comprising: selection means connected to said first and second frequency multipliers for alternately selecting the output signals from said first and second frequency multipliers; a mixing means connected to said selection means for heterodyning an input signal with the selected output signal; a filter connected to said mixing means for bandpass filtering the output signal from said mixing means; a sweep frequency signal generator for repetitively generating a signal whose frequency rises from a first limit frequency to a second limit frequency; a mixer connected to said filter and to said sweep frequency signal generator for heterodyning the output signal from said filter with the output signal from said sweep frequency signal generator; filtering means connected to said mixer for filtering the output signal from said mixer; and detector means connected to said filtering means for detecting the output signals from said filtering means.

Claim 11

In combination: a generator of a selected frequency signal; a first frequency multiplier connected to said generator and having a first selected multiplier factor; a second frequency multiplier connected to said generator and having a second selected multiplier factor; and means connected to said first and second frequency multipliers for generating a first and a second spectrum signal comprising: selection means connected to said first and second frequency multipliers for alternately selecting the output signals from said first and second frequency multipliers; a mixing means connected to said selection means for heterodyning an input signal with the selected output signal; a filter connected to said mixing means for bandpass filtering the output signal from said mixing means; a sweep frequency signal generator for repetitively generating a signal whose frequency rises from a first limit frequency to a second limit frequency; a mixer connected to said filter and to said sweep frequency signal generator for heterodyning the output signal from said filter with the output signal from said sweep frequency signal generator; filtering means connected to said mixer for filtering the output signal from said mixer; and detector means connected to said filtering means for detecting the output signals from said filtering means.

Claim 12

The combination of claim 6 further comprising: a first bias signal source; a second bias signal source; and means connected to said means for generating a first and a second spectrum signal and said first and second bias signAl sources for simultaneously displaying said spectrum signals on a signal display device.

Claim 13

In combination: a source of a plurality of signals of respectively different frequency; selection means connected to said source for selecting any one of said plurality of signals; time-shared frequency shifting means connected to said selection means for frequency shifting an input signal by an amount equal to the frequency of the selected signal; time-shared filtering means connected to said time-shared frequency shifting means for bandpass filtering the output signals of said time-shared frequency shifting means; time-shared frequency scanning means connected to said time-shared filtering means for frequency scanning the output signals of said time-shared filtering means to produce frequency spectrum signals; and time-shared means connected to said time-shared frequency scanning means for displaying said frequency spectrum signals on selected portions of a display screen.

Claim 14

In combination: a source of a plurality of signals of respectively different frequency; selection means connected to said source for selecting any one of said plurality of signals; time-shared frequency shifting means connected to said selection means for frequency shifting an input signal by an amount equal to the frequency of the selected signal; time-shared filtering means connected to said time-shared frequency shifting means for bandpass filtering the output signals of said time-shared frequency shifting means; time-shared frequency scanning means connected to said time-shared filtering means for frequency scanning the output signals of said time-shared filtering means to produce frequency spectrum signals; and time-shared means connected to said time-shared frequency scanning means for displaying said frequency spectrum signals on selected portions of a display screen.

Claim 15

In combination: a first source of a first frequency signal; a second source of a second frequency signal; first selection means connected to said first and second sources for selecting said first frequency signal or said second frequency signal; a source of scanning control signals; means connected to said source of scanning control signals for generating a scanning signal comprising a sweep of frequencies between a first limit frequency and a second limit frequency; scanning means connected to said first selection means and to said means for generating a scanning signal for scanning a band of frequencies in an input signal to produce a frequency spectrum signal instantaneously corresponding to the amplitude of the concurrently scanned frequency of said input signal; wherein the width of the band of frequencies scanned is determined by the difference between said first limit frequency and said second limit frequency; and means connected to said scanning means for displaying said frequency spectrum signal.

Claim 16

In combination: a first source of a first frequency signal; a second source of a second frequency signal; first selection means connected to said first and second sources for selecting said first frequency signal or said second frequency signal; a source of scanning control signals; means connected to said source of scanning control signals for generating a scanning signal comprising a sweep of frequencies between a first limit frequency and a second limit frequency; scanning means connected to said first selection means and to said means for generating a scanning signal for scanning a band of frequencies in an input signal to produce a frequency spectrum signal instantaneously corresponding to the amplitude of the concurrently scanned frequency of said input signal; wherein the width of the band of frequencies scanned is determined by the difference between said first limit frequency and said second limit frequency; and means connected to said scanning means for displaying said frequency spectrum signal.

Claim 17

The combination of claim 9 wherein said means for displaying said frequency spectrum signal comprises: a first bias signal source; a second bias signal source; second selection means connected to said first and second bias signal sources for selecting an output signal from any one of said bias signal sources; summing means connected to said scanning means and to said second selection means for generating a display signal by summing the output signal of said second selection means and said frequency spectrum signal; and means connected to said summing means for displaying said display signal.

Claim 18

In combination: a plurality of sources of different frequency signals; first selection means connected to said plurality of sources for selecting the output signal of any one of said plurality of sources; first heterodyning means connected to said first selection means for frequency shifting an input signal by an amount equal to the frequency of the signal selected by said selection means; filtering means connected to said first heterodyning means for substantially attenuating signal components with frequencies below a first lower limit frequency and above a first upper limit frequency in the output signal from said first heterodyning means; a tuned amplifier for amplifying signals of a selected tuned frequency and substantially attenuating other signals; a source of scanning control signals; a variable frequency source connected to said source of scanning control signals for generating a signal having its frequency vary in time within a band of frequencies defined by a second lower limit frequency and a second upper limit frequency; wherein said second lower limit frequency is equal to said first lower limit frequency minus said tuned frequency and said second upper limit frequency is equal to said first upper limit frequency minus said tuned frequency; second heTerodyning means connected to said filtering means and to said variable frequency source for instantaneously frequency shifting the output signal from said filtering means by an amount equal to the concurrent frequency of the output signal from said variable frequency source; wherein said tuned amplifier is connected to said second heterodyning means; detector means connected to said tuned amplifier for detecting the output signal from said tuned amplifier; a plurality of sources of different bias signals; second selection means connected to said plurality of sources of bias signals for selecting any one of said bias signals; summing means connected to said detector means and to said second selection means for summing the output signal from said detector means with the selected bias signal to generate a display signal; and means connected to said summing means for displaying said display signal.

Claim 19

In combination: a plurality of sources of different frequency signals; first selection means connected to said plurality of sources for selecting the output signal of any one of said plurality of sources; first heterodyning means connected to said first selection means for frequency shifting an input signal by an amount equal to the frequency of the signal selected by said selection means; filtering means connected to said first heterodyning means for substantially attenuating signal components with frequencies below a first lower limit frequency and above a first upper limit frequency in the output signal from said first heterodyning means; a tuned amplifier for amplifying signals of a selected tuned frequency and substantially attenuating other signals; a source of scanning control signals; a variable frequency source connected to said source of scanning control signals for generating a signal having its frequency vary in time within a band of frequencies defined by a second lower limit frequency and a second upper limit frequency; wherein said second lower limit frequency is equal to said first lower limit frequency minus said tuned frequency and said second upper limit frequency is equal to said first upper limit frequency minus said tuned frequency; second heTerodyning means connected to said filtering means and to said variable frequency source for instantaneously frequency shifting the output signal from said filtering means by an amount equal to the concurrent frequency of the output signal from said variable frequency source; wherein said tuned amplifier is connected to said second heterodyning means; detector means connected to said tuned amplifier for detecting the output signal from said tuned amplifier; a plurality of sources of different bias signals; second selection means connected to said plurality of sources of bias signals for selecting any one of said bias signals; summing means connected to said detector means and to said second selection means for summing the output signal from said detector means with the selected bias signal to generate a display signal; and means connected to said summing means for displaying said display signal.