Patent ID: 11888538
Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A receiving apparatus comprising:
M receivers configured to receive signals based on sound waves propagating in water;
M FIR filters configured to perform waveform operation on the signals received by the receivers;
a combiner configured to combine output signals of the M FIR filters; and
a filter coefficient calculator configured to calculate a tap coefficient of the M FIR filters so as to reduce an error of the output signals combined by the combiner,
wherein the M FIR filters have a tap length that is shorter than a delay spread that is a possible range between a time of arrival of a direct wave and a time of arrival of a delayed wave of the sound waves, where M is an integer greater than or equal to two.