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US 4,257,104 AGranted
Apparatus for spectrum analysis of an electrical signal
AssigneeHewlett-Packard Company
InventorsLarry R. Martin, Michael S. Marzalek
Life of this patent
Estimating the term…
Abstract
An input signal is mixed with sampling signals from oscillators which vary the frequency of the sampling signal from a first frequency to a second frequency. The resulting Intermediate Frequency (IF) signal is processed and digital values are stored in a memory in response thereto. Waveforms are then displayed which correspond to these frequency and amplitude values. Various input and display circuits facilitate the display and interpretation of these waveforms.
Claims13
Apparatus for use in the spectrum analysis of a signal, said apparatus comprising:
- input means having inputs for receiving an input signal and a sampling signal for providing an intermediate frequency signal in response to said input signal and said sampling signal;
- signal processing means coupled to said input means for providing a first digital signal in response to said intermediate frequency signal;
- memory means coupled to said signal processing means for storing electrical representations of said digital signal in response to a memory control signal;
- memory control means coupled to said memory means for providing said memory control signal;
- display means coupled to said memory means for providing a waveform display in response to display control signals and said electrical representations;
- display control means coupled to said display means for providing said display control signals in response to operator control signals;
- operator controls coupled to said display control means for providing said operator control signals and including means for providing a first marker control signal in response to first operator manifestations indicating it is desired to include a first visual indication with said waveform display;
- and
- said display control means including means for causing said display means to include a first visual indication at a first predetermined position on said waveform display in response to said first marker control signal.
6 more elements
Apparatus for use in a spectrum analysis of a signal, said apparatus comprising;
- input means having inputs for receiving an input signal and a sampling signal for providing an intermediate frequency signal in response to said input signal and said sampling signal;
- signal processing means coupled to said input means for providing a first digital signal in response to said intermediate frequency signal and operator control signals;
- memory means coupled to said signal processing means for storing electrical representations of said digital signal in response to a memory control signal;
- memory control means coupled to said memory means for providing said memory control signal;
- display means coupled to said memory means for providing a waveform display in response to display control signals and said electrical representations;
- display control means coupled to said display means for providing said display control signals in response to said operator control signals;
- operator controls coupled to said display control means and said signal processing means for providing said operator control signals;
- and
- means for causing said operator controls to alter the waveform display in the same proportion as the magnitude of the activation of said controls has to a first preselected parameter of said display without regard to the absolute values currently represented by said display waveform.
6 more elements
Apparatus for use in the spectrum analysis of a signal, said apparatus comprising:
- input means having inputs for receiving an input signal and a sampling signal and for providing an intermediate frequency signal in response to said input signal and said sampling signal;
- signal processing means coupled to said input means for providing a first digital signal in response to said intermediate frequency signal;
- memory means coupled to said signal processing means for storing electrical representations of said digital signal in response to a memory control signal;
- memory control means coupled to said memory means for providing said memory control signal;
- display means coupled to said memory means for providing a waveform display in response to display control signals and said electrical representations, said waveform display having span parameters comprising a start frequency, a center frequency and a stop frequency for each displayed waveform, said display control means causing said display means to sequentially provide waveform displays corresponding to said input signal and said sampling signal;
- and
- center frequency selection means coupled to said display control means and said display means for causing the greatest frequency value of each said waveform display to be the center frequency.
4 more elements
Dependencies are inferred from the claim text.