Frequency spectrum analyzer with a real time display device

Claim 2

A frequency spectrum analyzer comprising: a frequency spectrograph for dividing a predetermined spectrum section of each of two input signals into a plurality of constituent frequency components; coder means for coding the intensities of said frequency components into time-sequential signals; a signal processing circuit for providing a predetermined time delay to said time-sequential signals to time-compress and convert said signals into analogous signals representing the intensities of said spectrum sections; a visual display device for visually displaying the spectrograms of said two input signals in a contrastive manner, said spectrograms representing the relation between time, frequency components and intensities thereof obtained through the analysis; said signal processing circuit including a changeover circuit for changing over the display mode of said display device; and a timing signal generator circuit for timing said circuit and said device with each other.

Claim 3

A frequency spectrum analyzer as defined in claim 1, wherein said signal processing circuit includes: decoder means for generating a plurality of level-representing signals in accordance with the codes selected for said time-compressed pulses; and means for generating color defining signals to select a series of predetermined different colors in accordance with said level-representing signals.

Claim 4

A frequency spectrum analyzer as defined in claim 1, wherein said visual display device includes: a color picture tube and its associated driving circuit; and means for providing a color display in which respective colors correspond to different intensities of the analyzed frequency components of the input signals.

Claim 5

A frequency spEctrum analyzer comprising: a frequency spectrograph for converting a plurality of constituent frequency components of each of two input signals into time-sequential signals and selecting the spectrum sections of said two inputs alternately to combine them together into a single time-sequential signal; coder means for coding the frequency components constituting said time-sequential spectrum sections into signals representative of plural bits, the signals representative of each bit train being provided as parallel outputs; a signal processing circuit provided for each bit train and including a time compressing circuit, a gate circuit for selecting a particular portion of each spectrum section time-compressed by said time-compressing circuit and separating signals corresponding to said two input signals into two circuits, a circuit for designating the display mode for the spectrograms of said two input signals to thereby control the time range for said gate circuit to select the spectrum section, second time-compressing circuits disposed toward the outputs of said two gate circuits, each of said second time-compressing circuits including a plurality of delay circuits and associated changeover circuits arranged in a loop forming said time-compressing circuit, and a circuit for combining together the outputs of said two second time-compressing circuits into a single time-sequential signal; a control signal generator circuit for driving gate and switch circuits in said plurality of signal processing circuits to generate command signals representing vertical, horizontal, moving and stationary display modes for the spectrograms of said two signals; and a circuit for combining the outputs of said parallel signal processing circuits and converting them into color signals.

Claim 6

A frequency spEctrum analyzer comprising: a frequency spectrograph for converting a plurality of constituent frequency components of each of two input signals into time-sequential signals and selecting the spectrum sections of said two inputs alternately to combine them together into a single time-sequential signal; coder means for coding the frequency components constituting said time-sequential spectrum sections into signals representative of plural bits, the signals representative of each bit train being provided as parallel outputs; a signal processing circuit provided for each bit train and including a time compressing circuit, a gate circuit for selecting a particular portion of each spectrum section time-compressed by said time-compressing circuit and separating signals corresponding to said two input signals into two circuits, a circuit for designating the display mode for the spectrograms of said two input signals to thereby control the time range for said gate circuit to select the spectrum section, second time-compressing circuits disposed toward the outputs of said two gate circuits, each of said second time-compressing circuits including a plurality of delay circuits and associated changeover circuits arranged in a loop forming said time-compressing circuit, and a circuit for combining together the outputs of said two second time-compressing circuits into a single time-sequential signal; a control signal generator circuit for driving gate and switch circuits in said plurality of signal processing circuits to generate command signals representing vertical, horizontal, moving and stationary display modes for the spectrograms of said two signals; and a circuit for combining the outputs of said parallel signal processing circuits and converting them into color signals.