US 2015/0310593 A1Published application

Noise removal system, noise removal method, and program

AssigneeNEC Corporation

InventorEita KOBAYASHI

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Abstract

In order to make it possible to reduce the storage capacity required for noise removal processing in, for example, multi-resolution analysis and the like, without affecting signal quality, the present invention is equipped with: a storage device into which a input signal of a first channel is written, the input signal branching off into at least first and second channels; a first frequency transform processing unit which transforms the input signal read out and inputted from the storage device into a frequency-domain to output a first signal; a second frequency transform processing unit which transforms the input signal inputted from the second system into a frequency-domain to output a second signal; a third frequency transform processing unit which transforms the second input signal inputted from the second frequency transform processing unit into a frequency range to output a third and fourth signals in the first and second frequency bands; a first inverse frequency transform processing unit; and a second inverse frequency transform processing unit to which directly or indirectly inputting the third signal from the third frequency transform processing unit is directly or indirectly inputted and the fourth signal from the third frequency transform processing unit is inputted, and which outputs a third transformed signal produced through performing inverse frequency transform on the inputted signals. Therein, the first inverse frequency transform processing unit, to which the first signal from the first frequency transform processing unit is directly or indirectly inputted and the third converted signal from the second inverse frequency transform processing unit is directly or indirectly inputted, outputs a signal produced through performing inverse frequency transform on the inputted signals.

Claims10

Dependent claims

A noise removal system comprising:

a storage device, an input signal branching off into at least a first channel and a second channel at a branch unit, the input signal of the first channel being written into the storage device;
a first frequency transform processing unit which transforms the input signal read out and inputted from the storage device into a frequency-domain signal to output a first signal;
a second frequency transform processing unit which transforms the input signal, which is inputted, of another channel into a frequency-domain signal to output a second signal;
a third frequency transform processing unit which transforms the second signal inputted from the second frequency transform processing unit into a frequency-domain signal to output a third signal and a fourth signal in a first frequency band and a second frequency band;
a first inverse frequency transform processing unit;
a second inverse frequency transform processing unit to which the third signal is inputted directly or indirectly from the third frequency transform processing unit and the fourth signal is inputted from the third frequency transform processing unit, and which outputs a third transformed signal produced through inverse frequency transform on inputted signals;
and
a first coring processing unit and/or a second coring processing unit, wherein
the first inverse frequency transform processing unit, to which the first signal is inputted directly or indirectly from the first frequency transform processing unit and the third transformed signal is inputted directly or indirectly from the second inverse frequency transform processing unit, outputs a signal produced through inverse frequency transform performed on inputted signals,
the first coring processing unit outputs a first transformed signal produced through noise removal on the first signal from the first frequency transform processing unit, the first transformed signal from the first coring processing unit being inputted as indirect input of the first signal to the first inverse frequency transform processing unit, and
the second coring processing unit outputs a second transformed signal produced through noise removal on the third signal from the third frequency transform processing unit, the second transformed signal from the second coring processing unit being inputted as an indirect input of the third signal to the second inverse frequency transform processing unit.

8 more elements

A noise removal method comprising:

a process of writing temporarily into a storage device an input signal of an first channel, the input signal branching off into at least the first channel and a second channel;
a first frequency transform processing process of transforming the input signal read out from the storage device into a frequency-domain to generate a first signal;
a second frequency transform processing process of transforming the input signal of the second channel into a frequency-domain to generate a second signal;
a third frequency transform processing process of transforming the second signal into a frequency-domain to generate a third signal and a fourth signal in a first frequency band and a second frequency band;
a first inverse frequency transform processing process;
a second inverse frequency transform processing process, to which directly or indirectly inputs the third signal is directly or indirectly inputted and the fourth signal is inputted, of generating a third transformed signal which is produced through inverse frequency transform performed on inputted signals, and
a first coring processing process and/or a second coring processing process;
wherein
in the first inverse frequency transform processing process, the first signal is directly or indirectly inputted, the third transformed signal is directly or indirectly inputted, and a signal produced through inverse frequency transform performed on inputted signals is outputted,
in the first coring processing process, a first transformed signal is outputted, the first transformed signal being produced through noise removal on the first signal from the first frequency transform processing process, the first transformed signal from the first coring processing process being inputted in the first inverse frequency transform process as an indirect input of the first signal, and
in the second coring processing process, a second transformed signal is outputted, the second transformed signal being produced through noise removal on the third signal from the third frequency transform processing process, the second transformed signal from the second coring processing process being inputted in the second inverse frequency transform processing process as an indirect input of the third signal.

8 more elements

A non-transitory computer readable medium storing a program causing a computer to execute:

processing of writing temporarily into a storage device an input signal in a first channel, the input signal branching off into at least the first channel and a second channel;
first frequency transform processing, in which the input signal read out from the storage device is inputted, of transforming the signal into a frequency domain to output a first signal;
second frequency transform processing, in which the input signal in the other channel is inputted, of transforming the signal into a frequency-domain to output a second signal;
third frequency transform processing, in which the second signal from the second frequency domain transform processing is inputted, of transforming the signal into a frequency-domain to output a third signal and a fourth signal in a first frequency band and a second frequency band;
first inverse frequency transform processing;
second inverse frequency transform processing, in which the third signal from the third frequency transform processing is directly or indirectly inputted and the fourth signal from the third frequency transform processing is inputted, of outputting a third transformed signal which is produced through inverse frequency transform performed on inputted signals;
and
first coring processing and/or second coring processing, wherein
in the first inverse frequency transform processing, the first signal from the first frequency transform processing is directly or indirectly inputted, the third transformed signal from the second inverse frequency transform processing is directly or indirectly inputted, and a signal produced through inverse frequency transform performed on inputted signals is outputted,
in the first coring processing, a first transformed signal is outputted, the first transformed signal being produced through noise removal on the first signal from the first frequency-conversion processing, the first transformed signal from the first coring processing being inputted as an indirect input of the first signal to the first inverse frequency transform processing, and
in the second coring processing, a second transformed signal is outputted, the second transformed signal being produced through noise removal on the third signal from the third frequency transform processing, the second transformed signal from the second coring processing being inputted as an indirect input of the third signal to the second inverse frequency transform processing.

8 more elements

Dependencies are inferred from the claim text.