Higher harmonic noise eliminating method

Abstract

Abstract PURPOSE:To enable high-speed data transmission in a system that uses a power line as a signal transmission line, by storing higher harmonic noise of AC wave over one period of the AC wave, and subtracting stored noises from received signals. CONSTITUTION:In a stage where no signal is transmitted, AC wave and higher harmonic noise are sampled in a sampling circuit 3, and the result is converted to digital values and sotred in a storing circuit 6. When a signal is transmitted, renewal of memory is not made from that point of time, and a final stored value is inputted from the storing circuit 6 to an arithmetic discriminating circuit 7. On the other hand, a sampling value obtained by digital conversion of received signal is inputted to the arithmetic discriminating circuit 7 from an input terminal 1 through a filter 2 and the sampling circuit 3. The arithmetic discriminating circuit 7 makes subtraction of these two kinds of input signals, and outputs only signal component eliminating higher harmonic noise component.

Inventors

• 👤 Mitsuaki Fukushima
• 👤 福島　光明
• 👤 Satoshi Komazawa
• 👤 駒沢　聰
• 👤 Etsuro Nakayama
• 👤 悦郎 中山

Bibliographic Details