| 摘要 |
The invention relates to a method of increasing the signal-to-noise ratio of a periodical electrical signal. In general, noise suppression of a periodical signal may be obtained by means of averaging a number of successive signals. In one embodiment of the present invention, the amplitudes of successive periodical signals are integrated for successive time periods which exclude various signal suppression subperiods. The suppression subperiods may be of variable duration, and are positioned beside each other in consecutive fashion. An overall integration value is also formed, by processing the amplitude of the signal without suppressing any portion thereof. From this overall integration value, the integration values associated with the various suppression subperiods are subtracted. The resulting difference signals are arranged in the same sequence as their associated suppression subperiods so as to produce an output signal having the same general waveform as the periodical signal. In an alternative embodiment, instead of integration values, corresponding average values of the signal amplitude may be used.
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