Digital qp detecting apparatus, spectrum analyzer having the same, and digital qp detecting method
First Claim
1. A digital QP detecting apparatus that detects an input signal and outputs a detection signal, comprising:
- a register that records an input digital data;
a first multiplier that multiplies the digital data recorded in said register by a first coefficient, and outputs the product;
a second multiplier that multiplies the digital data recorded in said register by a second coefficient, and outputs the product;
an adder that adds the input signal and the output from said first multiplier to each other;
a level comparator that compares the level of the input signal and the level of the detection signal with each other; and
a first switch that switches the digital data fed to said register between an output from said adder and the output from said second multiplier based on a comparison result by said level comparator, wherein the detection signal is generated based on an output from said first switch.
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Abstract
A QP detection unit includes digital circuit elements. There is provided a digital QP detector which detects an electric power signal Vi, which is an input signal, and outputs a detection signal Vo. The digital QP detector includes a register which records input digital data, a first multiplier which multiplies the digital data recorded in the register by a first coefficient, a second multiplier which multiplies the digital data recorded in the register by a second coefficient, an adder which adds the electric power signal Vi and the output from the first multiplier to each other, a comparator which compares the level of the electric power signal Vi and the level of the detection signal Vo, and a first switch which switches the digital data to be fed to the register between the output from the adder (Vi>Vo) and the output from the second multiplier (Vi<Vo) based on a comparison result of the comparator. The output of the first switch is output as the detection signal Vo via a third multiplier and a latch.
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Citations
9 Claims
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1. A digital QP detecting apparatus that detects an input signal and outputs a detection signal, comprising:
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a register that records an input digital data;
a first multiplier that multiplies the digital data recorded in said register by a first coefficient, and outputs the product;
a second multiplier that multiplies the digital data recorded in said register by a second coefficient, and outputs the product;
an adder that adds the input signal and the output from said first multiplier to each other;
a level comparator that compares the level of the input signal and the level of the detection signal with each other; and
a first switch that switches the digital data fed to said register between an output from said adder and the output from said second multiplier based on a comparison result by said level comparator, wherein the detection signal is generated based on an output from said first switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A digital QP detecting method of detecting an input signal and outputting a detection signal, comprising:
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recording an input digital data;
multiplying the digital data recorded in said recording step by a first coefficient, and outputting the product;
multiplying the digital data recorded in said recording step by a second coefficient, and outputting the product;
adding the input signal and the output from the step of multiplying the digital data by the first coefficient;
comparing the level of the input signal and the level of the detection signal with each other; and
switching the digital data recorded in said recording step between an output from said adding step and the output from the step of multiplying the digital data by the second coefficient based on a comparison result by said level comparing step, wherein the detection signal is generated based on an output from said switching step.
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Specification