Integrate and dump phase demodulator

Claim 2

A demodulator for the digital modulation signals of claim 1, wherein the feedback means for noise-compensating signals includes adding means for outputting the compensated phase deviation signals by adding the phase deviation signals and the noise-compensating signals.

Claim 3

A demodulator for the digital modulation signals of claim 1, wherein the generation means for noise-compensating signals includes: generation means for ideal phase deviation signals for outputting ideal phase deviation signals depending on the phase deviation based on the demodulated data; phase error selection means for outputting error signals by subtracting the ideal phase deviation signals from the compensated phase deviation signals; and multiplying means for outputting the noise-compensating signals by multiplying the error signals with a positive number less than 1.

Claim 4

A demodulator for the digital modulation signals of claim 3, wherein the generation means for noise-compensating signals further includes delaying means for outputting delayed error signals by delaying the error signals from the phase error selection means for integral time necessary for the integral discharge filter and subsequently for outputting the delayed error signals to the multiplying means.

Claim 5

A demodulator for the digital modulation signals of claim 3, the demodulator further comprising a high-pass filter installed between the phase error selection means and the feedback means for noise-compensating signals in order to cut off direct-current elements.

Claim 6

A demodulator for digital modulation signals comprising: frequency detection means; an integral discharge filter; feedback means for noise-compensating signals; compensation means for interference from preceding data; discrimination means; and generation means for noise-compensating signals, wherein; the frequency detection means outputs frequency detection signals by detecting frequencies of the digital modulation signals, the integral discharge filter outputs phase deviation signals by integrating the frequency detection signals for a given interval, the feedback means for noise-compensating signals outputs compensated phase deviation signals to the discrimination means by feeding back the noise-compensating signals from the generation means for noise-compensating signals to the phase deviation signals from the integral discharge filter, the compensation means for interference from preceding data outputs interference-compensated phase deviation signals by removing the interference from the preceding demodulation data from the compensated phase deviation signals, the discrimination means outputs demodulation data by discriminating the deviation of the digital modulation signals based on the compensated phase deviation signals, and the generation means for noise-compensating signals outputs the noise-compensating signals based on the phase deviation signals with compensated interference, demodulated data, and succeeding demodulation data.

Claim 7

A demodulator for the digital modulation signals of claim 6, wherein the feedback means for noise-compensating signals includes adding means for outputting the compensated phase deviation signals by adding the phase deviation signals and the noise-compensating signals.

Claim 8

A demodulator for the digital modulation signals of claim 6, wherein the compensation means for interference from preceding data comprises: a shift register for shifting the demodulation data from the discrimination means according to a given clock while withholding them for a given period as preceding data; and generation means for interference signals from preceding data for outputting interference signals from preceding data depending on the interference withheld by the shift register, wherein the compensation means for interference from preceding data outputs interference-compensated phase deviation signals by subtracting the interference signals from preceding data from the noise-compensated phase deviation signals.

Claim 9

A demodulator for the digital modulation signals of claim 6, wherein the generation means for noise-compensating signals comprises: generation means for ideal phase deviation signals for outputting ideal phase deviation signals depending on the phase deviation based on the demodulation data; generation means for interference signals from succeeding data for outputting interference signals from succeeding data depending on the interference based on the succeeding data; phase error selection means for outputting error signals by subtracting the ideal phase deviation signals and interference signals from succeeding data from the interference-compensated phase deviation signals, and multiplying means for outputting noise-compensating signals by multiplying the error signals with a positive number less than 1.

Claim 10

A demodulator for the digital modulation signals of claim 9, wherein the phase error selection means comprises delaying means for delaying signals obtained by subtracting the ideal phase deviation signals based on demodulation data from the interference-compensated phase deviation signals for integral time necessary for the integral discharge filter, and wherein the phase error selection means outputs error signals by subtracting the interference signals from succeeding data from the delayed signals.

Claim 11

A demodulator for the digital modulation signals of claim 9, the demodulator further comprising a high-pass filter installed between the phase error selection means and the feedback means for noise-compensating signals to cut off direct-current elements.

Claim 12

A demodulator for digital modulation signals comprising: frequency detection means for detecting frequency deviation by detecting frequencies of the digital modulation signals; an integral discharge filter for detecting phase deviation of the digital modulation signals by integrating the frequency deviation detected by the frequency detection means for a given time; and error accumulation means for accumulating errors included in the phase deviation detected by the integral discharge filter while multiplying the accumulated errors with a positive number less than 1 at each accumulation; discrimination means for outputting demodulation data by discriminating the phase deviation of the digital modulation signals based on the phase deviation detected by the integral discharge filter and the accumulated errors accumulated by the error accumulation means.

Claim 13

A demodulator for digital modulation signals of claim 12, wherein the discrimination means outputs the demodulation data actually by comparing the size of a sum of the phase deviation detected by the integral discharge filter and the accumulated errors by the error accumulation means with a given threshold.

Claim 14

A demodulator for digital modulation signals of claim 12, wherein the error accumulation means adds the differences between the phase deviation detected by the integral discharge filter and the ideal phase deviation depending on the phase deviation based on the demodulation data and the accumulated errors, while multiplies the accumulated errors with a positive number less than 1.

Claim 15

A demodulator for digital modulation signals of claim 12, the demodulator further comprises delaying means for delaying the accumulated errors accumulated by the accumulation means for an integral time necessary for the integral discharge filter, wherein the discrimination means outputs the demodulation data by discriminating the phase deviation of the digital modulation signals based on the phase deviation detected by the integral discharge filter and the delayed accumulated errors by the error accumulation means and delaying means.

Claim 16

A demodulator for digital modulation signals of claim 12, the demodulator further comprising: a high-pass filter for cutting direct-current elements of the accumulated errors accumulated by the error accumulation means, wherein the discrimination means outputs the demodulation data by discriminating the phase deviation of the digital modulation signals based on the phase deviation detected by the integral discharge filter, and the errors accumulated by the error accumulation means and cut off the direct-current elements by the high-pass filter.