JPH04348282A - Measuring device of signal amplitude - Google Patents

Abstract

PURPOSE:To enable discrete measurement of the amplitudes of a plurality of signals being present at the same time and different in a frequency. CONSTITUTION:A frequency filter bank 1 separating an input signal into each frequency, detection circuits 2 detecting outputs of the frequency filter bank, signal detecting circuits 3 determining the presence or absence of outputs of the detection circuits, and a signal selecting circuit 4 selecting one of outputs of the signal detecting circuits 3, are provided. Moreover, a frequency tuning control circuit 5 generating a frequency tuning signal corresponding to a signal outputted from the signal selecting circuit, a frequency tuned circuit 6 being tuned to the frequency in accordance with an output of the frequency tuning control circuit and passing only a signal of a tuned frequency out of input signals, and an amplitude measuring circuit 7 measuring the amplitude of the signal passed through the frequency tuned circuit 6 on the basis of a signal of the detection time of the signal outputted from the signal selecting circuit, are provided.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal amplitude measuring device, and more particularly to a signal amplitude measuring device having a measurement function for each frequency unit.

0002

2. Description of the Related Art As shown in FIG. 3, a conventional signal amplitude measuring device includes a frequency filter bank 1 that separates input signals by frequency, and a detection circuit 2 that detects signals separated by frequency. A signal detection circuit 3 that determines the presence or absence of each output of each of the detection circuits 3 by comparing with a reference level determined by the signal detection circuit 3, and a number of the Furuta bank 1 in which a signal is detected from among the outputs of these signal detection circuits 3 are selected. The signal selection circuit 4 has a signal selection circuit 4 that outputs the signal, and an amplitude measurement circuit 7 that measures the amplitude of the input signal based on the detection time signal of the signal output from the signal selection circuit 4.

0003

[Problem to be Solved by the Invention] This conventional signal amplitude measuring device measures the amplitude of the input signal as it is based on the detection time signal, so multiple signals with different frequencies are input at the same time. In this case, a plurality of signals are output from the signal selection circuit 4, and if the amplitude of the input signal is measured based on these signals, the amplitude of a signal in which the plurality of signals are superimposed will be measured. An object of the present invention is to provide a signal amplitude measuring device that is capable of separately measuring the amplitudes of a plurality of signals having different frequencies existing at the same time.

0004

[Means for Solving the Problems] A signal amplitude measuring device of the present invention provides an output from a signal selecting circuit to a signal amplitude measuring device comprising a frequency filter bank, a detection circuit, a signal detecting circuit, a signal selecting circuit, and an amplitude measuring circuit. a frequency tuning control circuit that generates a frequency tuning signal corresponding to the signal to be tuned; and a frequency tuning control circuit that is tuned to a frequency according to the output of the frequency tuning control circuit;
a frequency tuning circuit that passes only the signal at the tuning frequency among the input signals, and the amplitude measurement circuit measures the amplitude of the signal passed through the frequency tuning circuit based on the detection time signal of the signal output from the signal selection circuit. The configuration is configured to measure. In this case, the frequency tuning circuit includes a local oscillation circuit that generates a signal with a frequency based on the output of the frequency tuning control circuit, a mixer that mixes the input signal with the output signal of the local oscillation circuit to convert the frequency, and an output signal from the mixer. It may also be configured with a bandpass filter that performs bandpass filtering on the signal.

[0005]

[Operation] According to the present invention, only a signal having a frequency tuned to the signal selected by the signal selection circuit is passed through the frequency tuning circuit, and only the amplitude of the passed signal is measured by the amplitude measurement circuit. It becomes possible to separate and measure the amplitudes of multiple signals with different frequencies that exist at the same time.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of the present invention. In the figure, 1 is a frequency filter bank, which separates an input signal by frequency and outputs the separated signals. Reference numeral 2 denotes a detection circuit, which detects and outputs the respective outputs separated by the frequency filter bank 1. 3 is a signal detection circuit which determines the presence or absence of the output from the detection circuit 2 and outputs the result. A signal selection circuit 4 selects and outputs one of the outputs of the signal detection circuit 3. A frequency tuning control circuit 5 generates and outputs a frequency tuning signal from the output of the signal selection circuit 4. Reference numeral 6 denotes a frequency tuning circuit, which varies the tuning frequency according to the output of the frequency tuning control circuit 5, and selects and outputs only the frequency corresponding to the frequency tuning signal from among the input signals. Reference numeral 7 denotes an amplitude measuring circuit, which measures the amplitude of the output of the frequency tuning circuit 6 based on the signal detection time signal output from the signal selection circuit 4, and outputs the measurement result.

According to this configuration, the signal selection circuit 4 selectively selects one of the detected signals from the frequency tuning control circuit 5.
The frequency tuning control circuit 5 sets the tuning frequency of the frequency tuning circuit 6 based on this output. Therefore, as for the input signal, a signal with a tuned frequency is passed through the frequency tuning circuit 6, and only this passed signal is amplitude-measured in the amplitude measuring circuit 7, so that multiple signals with different frequencies are input at the same time. Even in this case, the amplitudes of signals separated for each frequency can be measured.

FIG. 2 is a block diagram showing a second embodiment of the present invention. The frequency tuning circuit 6 in FIG. 1 is replaced with a local oscillation circuit 8, a mixer 9, and a BPF (bandpass filter) 10. That is, a frequency filter bank 1 separates the input signal according to frequency, and a detection circuit 2 detects and outputs the signal. The signal detection circuit 3 determines the presence or absence of an output and outputs the result. The signal selection circuit 4 selects and outputs one of these outputs. A frequency tuning control circuit 5 generates a frequency tuning signal from this output, and controls the local oscillation frequency which is the output of the local oscillation circuit 8.

[0009]Then, in the mixer 9, the input signal is frequency-converted by the local oscillation frequency,
The BPF 10 selects a frequency corresponding to the frequency selected by the signal selection circuit 4, and the amplitude measurement circuit 7 measures the amplitude of the signal output from the BPF 10 based on the signal detection time signal output from the signal selection circuit 4. Output the measurement results. Therefore, since the amplitude of the input signal is measured after passing through the BPF 10, even if multiple signals with different frequencies are input at the same time, it is possible to measure the amplitude of each signal separated by frequency. .

0010

Effects of the Invention As explained above, the present invention allows only a signal with a frequency tuned to the signal selected by the signal selection circuit to pass through the frequency tuning circuit, and only the signal that has passed is measured by the amplitude measurement circuit. Since it is measured, it has the effect of being able to separate and measure the amplitudes of a plurality of signals with different frequencies that exist at the same time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a first embodiment of a signal amplitude measuring device of the present invention.

FIG. 2 is a block diagram of a second embodiment of the signal amplitude measuring device of the present invention.

FIG. 3 is a block diagram of a conventional signal amplitude measuring device.

[Explanation of symbols]

1 Filter bank
2 Detection circuit 3 Signal detection circuit
4 Signal selection circuit 5 Frequency tuning control circuit 6 Frequency tuning circuit 7 Amplitude measurement circuit

Claims (2)

[Claims] Claim 1: A frequency filter bank that separates an input signal into each frequency, a detection circuit that detects the output of this frequency filter bank, a signal detection circuit that determines the presence or absence of an output of this detection circuit, and this signal detection circuit. 1 of the outputs of
a signal selection circuit that selects one of the input signals; a frequency tuning control circuit that generates a frequency tuning signal corresponding to the signal output from the signal selection circuit; a frequency tuning circuit that passes only a signal having a tuning frequency among the signals; and an amplitude measuring circuit that measures the amplitude of the signal passed through the frequency tuning circuit based on a detection time signal of the signal output from the signal selection circuit. A signal amplitude measuring device comprising: 2. The frequency tuning circuit includes a local oscillation circuit that generates a signal with a frequency based on the output of the frequency tuning control circuit, and a mixer that mixes the input signal with an output signal of the local oscillation circuit to convert the frequency. Claim 1 comprising a bandpass filter for bandpass filtering the signal output from the mixer.
signal amplitude measurement device.