JPS6078A - Peak value holding meter circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a peak value hold meter circuit, and more particularly to a peak value hold meter circuit that selects an arbitrary signal depending on the level of one or more discontinuous signals of one period, and This invention relates to a meter circuit that samples and holds the peak value of a selected signal completely independently of the signal.

When metering one or more periodic signals that are discontinuous in time, it is required to distinguish the sampled peak value from the others in order to monitor each signal independently.

Conventionally, when indicating a temporally discontinuous periodic signal with a meter, a method has been considered in which when an input signal of a certain value or more is applied, a sampling circuit is operated to hold and indicate the peak value. However, in this method, if the number of discontinuous signals per period is cy, or if there are two or more discontinuous signals but their peak values are all equal, the sampled peak value can be correctly indicated, but if the discontinuous signal is If there are two or more discontinuous signals per period and their peak values are different, all the discontinuous signals are sampled in each period, so the meter reading depends on the position of each discontinuous signal in the period. The value varies from the maximum value to the minimum value, and there was a drawback that individual values could not be determined.

In contrast, by synchronizing the sampling circuit with the period of the discontinuous signal and providing a circuit that determines the phase at which the desired discontinuous signal is output, the desired discontinuous wave signal sampling value can be distinguished from other signals and metered. A circuit is being considered that instructs the However, phase synchronization requires very high precision and has the disadvantage of requiring expensive circuitry.

The present invention has been made to improve these drawbacks, and therefore, an object of the present invention is to add one window comparator, adjust the detection level of the cine continuous signal, and distinguish the cine continuous signal, and calculate its peak value. The object of the present invention is to provide a novel meter circuit at a low cost that allows sampling and holding instructions to be performed completely independently of other signals.

In order to achieve the above objectives, the peak value hold meter circuit according to the present invention includes a window comparator whose detection level is adjustable and a sampling hold circuit driven by the output of this window comparator in the meter circuit. , and a meter that indicates the output of this sampling and holding circuit, so that even multiple periodic discontinuous signals can be controlled at any level without using complex circuits such as phase synchronization. The feature is that each signal is selected and its peak value is sampled and held individually.

Next, a preferred embodiment of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

In the figure, the reference number / is a signal input terminal, λ is a window comparator, 3 is a timer circuit driven by the window converter tacho, and da is a timer circuit driven by the timer circuit 3. 6 is a sampling circuit driven by timer circuit DA, 6 is a hold circuit that holds the output of sampling circuit J for more than one cycle, and 6 is a hold circuit that resets the signal previously held in hold circuit B when sampling circuit S is driven. A discharge circuit, an amplifier,
9 each indicates a meter.

Now, if the level of the input signal given to the input signal terminal l is within the level range determined by the wind converter tachometer, the wind converter tachometer detects this and sends the detection to the timer circuit 3. send a signal. The timer circuit 3 is a delay timer circuit for delaying the sampling period in consideration of distortion at the rising edge of the input signal.

After the operating time, timer circuit 3 sends a signal to timer circuit DA. The timer circuit DA is a circuit that determines the sampling period, and after the signal from the timer circuit 3 is sent to the timer circuit q, it sends a signal to the sampling circuit S for a certain period of time. Therefore, the input signal to the signal input terminal l passes through the sampling circuit S and is sent to the hold circuit 6, where its peak value is held. At the same time, since the signal previously held in the hold circuit B is discharged to the discharge circuit 7 through the sampling circuit 3, the signal held in the hold circuit B becomes purely the current sampling peak value. This value is amplified by amplifier g and then sent to the meter for indication.

On the other hand, if the input signal level to the input terminal l is outside the range determined by the window converter tacho, the window converter tacho does not accept it, and the sampling circuit 5 does not operate.

In this way, discontinuous signals of the same level are selected and instructed to be sampled and held. Therefore, as long as there is no change in the input signal level, it is possible to meter discontinuous signals of the same series.

Furthermore, by adjusting the detection level of the wind comparator λ, the signal to be sampled can be selected, and even for periodic discontinuous signals with different levels, individual values can be measured completely independently of the others. It becomes possible to give instructions.

It is clear that if there are one or more discontinuous signals per period, but their peak values are all the same, then by expanding the detection level range of the window comparator, it will show the same performance as the conventional circuit. .

In view of the above, according to the present invention, by adding a win/do comparator whose detection level is adjustable, it is possible to synchronize with one or two periodic signal sequences that are discontinuous in time. It becomes possible to select one series of signals without adding any additional circuits, sample and hold the peak value of the signal, and indicate it on the meter, completely independently of other signals.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. /...Signal input terminal, Co...Window comparator with adjustable detection level, 3...Timer circuit, Hiro...
Timer circuit, S...sampling circuit, 6...peak value hold circuit, R...discharge circuit (discharge resistor),
g...buffer amplifier, r...meter patent applicant
NEC Corporation Representative Patent Attorney Yutabe Kumagai

Claims (1)

[Claims] The meter circuit includes a window comparator with an adjustable detection level, a sampling and holding circuit that is driven by the output of this window comparator, and a meter that indicates the output of this sampling and holding circuit. A peak value hold meter circuit whose function is to select a signal at each arbitrary level from a plurality of discontinuous signals and sample and hold their peak values individually.