| 摘要 |
Apparatus for reducing frequency shifts in a frequency modulated carrier, comprising apparatus for reproducing from a record a recorded reference signal and a recorded information signal, a bi-directional accumulator, apparatus for adding pulses to the accumulator at a rate proportional to the frequency of the reproduced information signal, apparatus for subtracting pulses from the accumulator at a rate proportional to the reproduced reference frequency, apparatus for adding pulses to the accumulator at a reference rate equal to the rate at which the reproduced reference pulses would be subtracted in the absence of frequency deviation, and means for deriving an output signal from overflow signals produced by the accumulator.
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