Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural meters
Patent
1986-04-22
1988-05-10
Levy, Stewart J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural meters
324120, G01R 100
Patent
active
047438436
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a display signal generator device connected to an analog or digital display unit for generating a display pulse train signal regulated to display on any of analog and digital display units.
BACKGROUND ART
A conventional display signal generator device of this type needs to convert a certain signal into a signal of analog magnitude in the case of displaying the certain signal on an analog display unit, while the display signal generator device needs to convert the certain digital signal into a signal in the case of displaying the certain signal on a digital display unit.
As described above, the conventional display signal generator device requires a unit for processing the signal to be displayed corresponding to the format of the display unit, i.e., analog or digital. Thus, the conventional device is complicated in construction or needs to have two types of units for one for analog and one for digital, and is thus uneconomical.
DISCLOSURE OF THE INVENTION
It is therefore an object of the present invention to overcome such deficiency of the conventional display signal generator device. More particularly, the present invention has for its object to provide a display signal generator device which can convert a signal to be displayed into a frequency signal having a pulse repetition rate corresponding to the content of the signal, set the width of each pulse of this frequency signal to a predetermined value to thereby generate a pulse train signal capable of being applied to the display unit even if the display unit is of analog or digital type.
According to the present invention, there is provided a display signal generator device, which comprises: a converter for converting digital data representing the level of a signal to be displayed into a frequency signal in the form of a pulse train, and a pulse generator which outputs a signal for a digital display unit from the converter which has a predetermined pulse width in the output signal of the pulse generator so as to be capable of also driving an analog display unit.
In accordance with the present invention, the signal for the digital display unit has a pulse repetition rate corresponding to the content of the signal to be displayed, and is digitally displayed by an ordinary digital display unit using a counter, while the signal for the analog display unit has a value corresponding to the content of the signal to be displayed with the average value of the signal, and the analog display unit such as a meter is analog-displayed in response to the average value.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram of a display signal generator device according to one embodiment of the present invention,
FIG. 2 is a waveform diagram showing the operation of the display signal generator device shown in FIG. 1, and
FIG. 3 is a block diagram of a display signal generator device according to another embodiment of the invention.
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a block diagram showing an embodiment of a display signal generator device according to the present invention. Numeral 1 designates an amplifier, which amplifies an input signal S having a certain analog magnitude. Numeral 2 designates an analog-to-digital (A/D) converter for analog-to-digital converting a signal S1 which is output from the amplifier 1, numeral 3 designates a frequency (D/F) converter having a rate multiplier for generating a signal S3 in the form of a pulse train from a signal S2 of the A/D converter 2, numeral 4 designates a frequency divider for suitably dividing the frequency of the signal S3 and supplying a signal S4 to a digital display unit 6, and numeral 5 designates a pulse generator which is, for example, a monostable multivibrator, which accepts the signal S4, applies a pulse width T.sub.0 to the pulse and supplies a signal S5 to an analog display unit 7 such as, for example, a movable coil type ammeter.
The operation of the display signal generator device will be described with reference to FIG.
REFERENCES:
patent: 3689835 (1972-09-01), Bickfrod
patent: 3794916 (1974-02-01), Ritzenthaler
patent: 4081745 (1978-03-01), Yasunaga
patent: 4415855 (1983-11-01), Dubauskas
Arana Louis M.
Levy Stewart J.
Mitsubishi Denki & Kabushiki Kaisha
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