Receiving apparatus
AssigneeNippon Telegraph and Telephone Corporation
InventorsYosuke Fujino, Hiroyuki Fukumoto, Kazunori Akabane
Life of this patent
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Abstract
A receiving apparatus includes: 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 calculation portion 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. 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.
Claims5
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.
Dependencies are inferred from the claim text.