Speech recognition apparatus and speech recognition method
First Claim
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1. A speech recognition apparatus comprising:
- a sound collection unit that collects a sound signal;
a sound source localization unit that calculates a spatial spectrum from the sound signal that is collected by the sound collection unit and uses the calculated spatial spectrum to perform sound source localization;
a speech zone determination unit that determines a zone in which a power of the spatial spectrum that is calculated by the sound source localization unit exceeds a predetermined threshold value based on a vehicle state; and
a speech recognition unit that performs speech recognition with respect to a sound signal of the zone determined by the speech zone determination unit.
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Abstract
A speech recognition apparatus includes: a sound collection unit that collects a sound signal; a sound source localization unit that calculates a spatial spectrum from the sound signal that is collected by the sound collection unit and uses the calculated spatial spectrum to perform sound source localization; a speech zone determination unit that determines a zone in which a power of the spatial spectrum that is calculated by the sound source localization unit exceeds a predetermined threshold value based on a vehicle state; and a speech recognition unit that performs speech recognition with respect to a sound signal of the zone determined by the speech zone determination unit.
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Citations
7 Claims
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1. A speech recognition apparatus comprising:
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a sound collection unit that collects a sound signal; a sound source localization unit that calculates a spatial spectrum from the sound signal that is collected by the sound collection unit and uses the calculated spatial spectrum to perform sound source localization; a speech zone determination unit that determines a zone in which a power of the spatial spectrum that is calculated by the sound source localization unit exceeds a predetermined threshold value based on a vehicle state; and a speech recognition unit that performs speech recognition with respect to a sound signal of the zone determined by the speech zone determination unit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A speech recognition method comprising:
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(a) by way of a sound collection unit, collecting a sound signal; (b) by way of a sound source localization unit, calculating a spatial spectrum from the sound signal that is collected in (a) and using the calculated spatial spectrum to perform sound source localization; (c) by way of a speech zone determination unit, determining a zone in which a power of the spatial spectrum that is calculated in (b) exceeds a predetermined threshold value based on a vehicle state; and (d) by way of a speech recognition unit, performing speech recognition with respect to a sound signal of the zone determined in (c).
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Specification