Tuning indicator
OwnerJames A. Scharfe, Jr.inventor
Life of this patent
Estimating the term…
Abstract
An indicator for displaying RTTY signals in a terminal unit. The terminal unit converts mark and space signals from a radio receiver at audio frequencies to digital pulses for a readout device. Proper tuning of the radio receiver is facilitated by viewing the displayed signals. The readout device converts the digital pulses to alphanumeric characters.
Claims49
An indicator for visually displaying a pulsating DC signal comprising:
- means for selectively generating a plurality of separate output signals each in response to the pulsating DC signal, each output signal being generated so long as the magnitude of the pulsating DC signal is within one of a plurality of corresponding segments of a predetermined range of signal level;
- a plurality of discrete display devices which emit light when energized by an electrical signal, said plurality of display devices positioned in a row to form a meter;
- and
- means for coupling each output signal from said generating means to a pair of said discrete display devices, each said pair of display devices which are driven by the same output signal being positioned in said row substantially equidistant from the center of said row of display devices, said plurality of display devices being energized by said single generating means outwardly in opposite directions from the center of said bargraph meter in response to an increase in the magnitude of said pulsating DC signal.
An indicator coupled to an RTTY terminal unit for visually displaying mark and space pulsating DC signals received from an RTTY terminal unit comprising:
- first and second meters comprising first and second pluralities of discrete display devices, respectively, which emit light when energized with an electrical signal, said first and second pluralities of display devices each positioned in a row to form said first and second meters, respectively;
- and
- first and second means for selectively generating a plurality of separate output signals in response to mark and space pulsating DC signals from said terminal unit, each output signal being generated so long as the magnitude of its input signal is within one of a plurality of corresponding, segments of first and second predetermined ranges of signal level, respectively, output signals from said first and second generating means being coupled to said first and second meters, respectively.
In a terminal unit for converting mark and space signals from a radio receiver to a series of DC output pulses for further conversion of alphanumeric characters, the improvement comprising first and second meters for visually indicating mark and space signals from said terminal unit, said first and second meters having first and second pluralities of discrete display devices, respectively, which emit light when energized with an electrical signal, said first and second pluralities of display devices each positioned in a row to form first and second bargraph meters for visually displaying the mark and space signals, respectively;
- and
- first and second means for selectively generating a plurality of separate output signals in response to mark and space signals from said terminal unit, each output signal being generated so long as the magnitude of its input signal is one of a plurality of corresponding segments of a predetermined range of signal level, output signals from said first and second generating means being coupled to said first and second meters, respectively, to selectively energize said plurality of discrete display devices.
The indicator as claimed in claim 44 wherein the second means includes a first light emitting diode for visually indicating the reception of input mark signals and wherein said third means comprises a second light emitting diode connected in parallel with said first light emitting diode to indicate the absence of input mark signals to the terminal unit.
Dependencies are inferred from the claim text.