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US 9,431,022 B2Granted
Semiconductor device and voice communication device
AssigneeRenesas Electronics Corporation
InventorsMichi Kumagai, Tetsuya Nakagawa
Life of this patent
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Abstract
A semiconductor device for realizing higher-precision noise elimination includes: a decoder which decodes an encoded input signal; a determining unit which determines whether or not a voice signal is included in the input signal; a suppressor which performs a suppressing process for suppressing a noise component included in the input signal on the basis of a result of determination by the determining unit; and a first storage for storing, as a determination criterion value used for the determination, a first criterion value which specifies the proportion of a voice signal with respect to voice distortion noise.
Claims19
A semiconductor device comprising:
- a decoder which decodes an encoded input signal to form a decoded input signal;
- a determining unit which determines whether or not a voice signal is included in the decoded input signal;
- a suppression processor which performs a suppressing process for suppressing a noise component included in the decoded input signal on the basis of a result of determination by the determining unit;
- a first storage for storing, as a determination criterion value used for the determination, a first criterion value which specifies the proportion of a voice signal with respect to voice distortion noise;
- a second storage for storing, as a determination criterion value for determination by the determining unit, a second criterion value which specifies the proportion of a voice signal with respect to background noise;
- and
- a selector which selects the smaller of the first criterion value stored in the first storage and the second criterion value stored in the second storage,
- wherein the voice distortion noise is different from the background noise;
- and
- wherein the determining unit makes the determination using the criterion value selected by the selector.
7 more elements
A semiconductor device comprising:
- a decoder which decodes an encoded input signal to produce a decoded input signal;
- a determining unit which determines whether or not a voice signal is included in the decoded input signal, and further determines whether the voiced signal contains voiced sound or voiceless sound;
- a suppression processor which performs a suppressing process for suppressing noise included in the decoded input signal;
- and
- a storage for storing a criterion value for suppressing voice distortion noise, in noise included in the decoded input signal, which is used in the suppressing process;
- wherein the voice distortion noise is different from background noise;
- wherein the suppression processor suppresses voice distortion noise, only if the determining unit determines that a voice signal is included in the decoded input signal;
- and
- wherein the suppression processor suppresses background noise, whether or not the determining unit determines that a voice signal is included in the decoded input signal.
6 more elements
A semiconductor device comprising:
- a decoder which decodes an encoded input signal to form a decoded input signal containing both voice distortion noise and background noise;
- a suppression processor which suppresses a noise component included in the decoded input signal;
- a first storage for storing a plurality of first criterion values, each first criterion value specifying the proportion of a voice signal with respect to a different type of voice distortion noise;
- a second storage for storing a plurality of second criterion values, each second criterion value specifying the proportion a voice signal with respect to a different type of background noise;
- a selector which:
- in response to a selection signal corresponding to one type of voice distortion signal, receives from said first storage a selected first criterion value associated with said one type of voice distortion signal;
- in response to a mode signal corresponding to one type of background noise, receives from said second storage a selected second criterion value associated with said one type of background noise;
- and
- selects the smaller of the selected first and second criterion values;
- and
- a determining unit which determines whether or not a voice signal is included in the decoded input signal, based on the smaller of the two selected values selected by the selector;
- wherein:
- the suppression processor suppresses voice distortion noise, only if the determining unit determines that voice signal is included in the decoded input signal;
- and
- the suppression processor suppresses background noise, whether or not the determining unit determines that voice signal is included in the decoded input signal.
12 more elements
Dependencies are inferred from the claim text.