Frequency digital converter
First Claim
Patent Images
1. A frequency digital converter comprising:
- input means for receiving an input signal whose frequency is to be measured;
an oscillator including frequency changing means for changing the oscillation frequency of said oscillator in a stepped manner, in accordance with a received instruction signal;
counting means connected to said input means and said oscillator for counting the output pulses of said oscillator during a time determined on the basis of said frequency of said input signal;
means connected to said counting means for producing said instruction signal having a value in accordance with a respective predetermined number of pulses corresponding to each oscillating frequency step of said oscillator;
means for applying said instruction signal to said frequency changing means in said oscillator; and
digital output means for taking out the content of said counting means.
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Abstract
The proposed device serves to convert the input frequencies into corresponding digital values. In the pulse counting means for counting the pulses from a reference oscillator during each period of the input signal to be processed, the frequency of the reference oscillator is varied in a predetermined manner. It is therefore possible to appropriately change the output digital values in accordance with the change in the input frequency, the change in the output digital value being the set characteristic of each of predetermined ranges of frequencies.
25 Citations
18 Claims
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1. A frequency digital converter comprising:
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input means for receiving an input signal whose frequency is to be measured; an oscillator including frequency changing means for changing the oscillation frequency of said oscillator in a stepped manner, in accordance with a received instruction signal; counting means connected to said input means and said oscillator for counting the output pulses of said oscillator during a time determined on the basis of said frequency of said input signal; means connected to said counting means for producing said instruction signal having a value in accordance with a respective predetermined number of pulses corresponding to each oscillating frequency step of said oscillator; means for applying said instruction signal to said frequency changing means in said oscillator; and digital output means for taking out the content of said counting means. - View Dependent Claims (2, 3, 4, 5, 6)
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- 7. A frequency digital converter comprising:
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8. an input means for receiving an input signal whose frequency is to be measured;
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an oscillator whose oscillation frequency is varied in accordance with an instruction signal; a first counting means for counting the output pulses of said oscillator during a time determined on the basis of said frequency of said input signal; a second counting means for counting the pulses applied from said oscillator to said first counting means; and a means for delivering said instruction signals when the content of said second counting means becomes equal to the preset value, wherein said second counting means is reset when the content of said second counting means becomes equal to said preset value. - View Dependent Claims (10, 11, 12, 14, 18)
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13. A frequency digital converter comprising:
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an input means for receiving an input signal whose frequency is to be measured; an oscillator including frequency changing means for changing the oscillation frequency of said oscillator in a stepped manner, in accordance with a received instruction signal; a counting means for counting the output pulses of said oscillator during a time determined on the basis of said frequency of said input signal; a memory means for storing a predetermined number; and a means for delivering said instruction signal when the predetermined number in said memory means becomes equal to the content of said counting means. - View Dependent Claims (15, 16, 17)
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Specification