Signal processing circuit for noise elimination and demodulator circuit using the same for accurate demodulation
AssigneeTEAC Corporation
InventorAkira Mashimo
Life of this patent
Estimating the term…
Abstract
A signal processing circuit for eliminating noise from an input binary signal includes a measurement part and a signal output part. The measurement part measures the cumulative period of time of at least one of high-level and low-level states of the input binary signal for a predetermined period of time after the polarity of the input binary signal is inverted. The signal output part outputs at least one of high-level and low-level signals in accordance with the cumulative period of time.
Claims10
A signal processing circuit for eliminating noise from an input binary signal, the signal processing circuit comprising:
- a measurement part measuring a cumulative period of time of at least one of high-level and low-level states of the input binary signal for a predetermined period of time after a polarity of the input binary signal is inverted;
- and
- a signal output part outputting at least one of high-level and low-level signals in accordance with the cumulative period of time.
A circuit for demodulating a phase-modulated signal, the circuit comprising:
- a binarization circuit converting the phase-modulated signal to a binary signal by using a predetermined level as a threshold;
- a measurement part measuring a cumulative period of time of at least one of high-level and low-level states of the binary signal for a predetermined period of time after a polarity of the binary signal is inverted;
- a signal generation part generating at least one of high-level and low-level signals in accordance with the cumulative period of time;
- and
- a polarity inversion part inverting a polarity of an output signal thereof in accordance with a pulse width of a signal output from said signal generation part.
Dependencies are inferred from the claim text.