发明名称 |
Subband normalization, transformation, and voiceness to recognize phonemes for text messaging in a radio communication system |
摘要 |
A radio communication system includes a voice recognition system (221) for converting (400) a caller's voice message to a textual speech message. The textual speech message is then transmitted to an intended selective call radio (122). To perform these functions, the radio communication system includes a caller interface circuit (218), a transmitter (116), and a processor (222). To perform voice-to-text conversion, the processor is adapted to cause the caller interface circuit to sample a voice signal generated by the caller during a plurality of frame intervals, and to apply a Fourier transform thereto, thereby generating spectral data. The spectral data is subdivided into a plurality of bands. The spectral envelope of the spectral data is then filtered out to generate filtered spectral data. A Fourier transform is applied thereto to generate an autocorrelation function for each band. From the autocorrelation function of each band, a magnitude is determined, which is representative of the degree of voiceness of each band. The degree of voiceness for each band is then applied to a corresponding plurality of phoneme models, which are used to derive a textual equivalent of speech from the voice signal. The textual equivalent of speech is then transmitted to the selective call radio by way of the transmitter.
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申请公布号 |
US6163765(A) |
申请公布日期 |
2000.12.19 |
申请号 |
US19980050184 |
申请日期 |
1998.03.30 |
申请人 |
MOTOROLA, INC. |
发明人 |
ANDRIC, OLEG;CHANG, LU;HUANG, JIAN-CHENG;HERKERT, ARTHUR GERALD |
分类号 |
G10L15/02;G10L25/93;H04W88/18;(IPC1-7):G10L15/02 |
主分类号 |
G10L15/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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