Patent ID: 8301281
Filing Date: 2012-10-30
Classification: G10L

Abstract:
1. A high-frequency signal interpolation apparatus, comprising: a band-pass filter, which extracts a signal component of a predetermined frequency band from a sampled original signal supplied to an input terminal; a digital sample and hold means, which digitally samples and holds the extracted signal component in sync with a clock signal of a lower frequency than that of a sampling signal for the sampled original signal where the clock signal is synchronous to the same sampling signal; a ±1 multiplier, which alternately inverts sign bits of digital values output from the digital sample and hold means in sync with the clock signal; a high-pass filter, which extracts high-frequency components of a signal having sign bits inverted alternately by the ±1 multiplier; and an adder, which adds an output signal of the high-pass filter to the original signal supplied to the input terminal.