Voice processing device for maintaining sound quality while suppressing noise

A voice processing device comprising:

• a zone detection unit which detects a voice zone including a voice signal or a non-steady sound zone including a non-steady signal other than the voice signal from an input signal, wherein the zone detection unit detects a steady sound zone that includes the voice signal or a steady signal other than the non-steady signal;
• a filter calculation unit that calculates a filter coefficient of a filter for maintaining the voice signal in the voice zone and for suppressing the non-steady signal in the non-steady sound zone according to the detection result by the zone detection unit, wherein the filter calculation unit calculates a filter coefficient for suppressing the steady sound signal in the steady sound zone,
• wherein the filter calculation unit calculates the filter coefficient by using a filter coefficient calculated in the non-steady sound zone for the voice zone and using a filter coefficient calculated based on the contents of the voice zone for the non-steady sound zone;
• and
• a verification unit which verifies a constraint condition of the filter coefficient calculated by the filter calculation unit,
• wherein the verification unit verifies a constraint condition of the filter coefficient in the non-steady sound zone based on the determination whether or not a deterioration amount of the voice signal in the voice zone, that would result from applying the filter to the input signal, is equal to or greater than a predetermined threshold value.

A voice processing device comprising:

• a zone detection unit which detects a voice zone including a voice signal or a non-steady sound zone including a non-steady signal other than the voice signal from an input signal, wherein the zone detection unit detects a steady sound zone that includes the voice signal or a steady signal other than the non-steady signal;
• a filter calculation unit that calculates a filter coefficient of a filter for maintaining the voice signal in the voice zone and for suppressing the non-steady signal in the non-steady sound zone according to the detection result by the zone detection unit, wherein the filter calculation unit calculates a filter coefficient for suppressing the steady sound signal in the steady sound zone,
• wherein the filter calculation unit calculates the filter coefficient by using a filter coefficient calculated in the non-steady sound zone for the voice zone and using a filter coefficient calculated based on the contents of the voice zone for the non-steady sound zone;
• and
• a verification unit which verifies a constraint condition of the filter coefficient calculated by the filter calculation unit,
• wherein the verification unit verifies a constraint condition of the filter coefficient in the steady sound zone based on the determination whether or not a deterioration amount of the voice signal in the voice zone, that would result from applying the filter to the input signal, is equal to or greater than a predetermined threshold value.