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公开(公告)号：DE3855164D1
公开(公告)日：1996-05-02
申请号：DE3855164
申请日：1988-08-24
Applicant: MOTOROLA INC
Inventor： GERSON IRA , LINDSLEY BRETT
Abstract: A user-interactive speech recognition control system is disclosed for recognizing a complete sequence of keywords (e.g., a telephone number such as 123-4567) via entering, verifying, and editing variable-length utterance strings (e.g., 1-2-3; 4-5; 6-7) separated by the user-defined placement of pauses. The device controller (120) utilizes timers (124) to monitor the pause time between partial-sequence digit strings recognized by the speech recognizer (110). When a string of digits is followed by a predetermined pause time interval, the recognized digits will be replied via the speech synthesizer (130). An additional string of digits can then be entered, and only the subsequent string will be replied after the next pause. Furthermore, the user has the flexibility to correct only the last digit string entered, or the entire sequence. Hence, if there is an error in only one digit, the erroneous digit string can be corrected without having to re-enter the entire digit sequence. The invention is well-suited to be used in a hands-free voice command dialing system for a mobile radiotelephone, wherein vehicular background noise may affect recognition accuracy.
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公开(公告)号：DE3853916D1
公开(公告)日：1995-07-06
申请号：DE3853916
申请日：1988-12-29
Applicant: MOTOROLA INC
Inventor： GERSON IRA
Abstract: An improved excitation vector generation and search technique (FIG. 1) is described for a code-excited linear prediction (CELP) speech coder (100) using a codebook of excitation code vectors. A set of M basis vectors Vm(n) are used along with the excitation signal codewords (i) to generate the codebook of excitation vectors ui(n) according to a "vector sum" technique (120) of converting the selector codewords into a plurality of interim data signals, multiplying the set of M basis vectors by the interim data signals, and summing the resultant vectors to produce the set of 2M codebook vectors. The entire codebook of 2M possible excitation vectors is efficiently searched by using the vector sum generation technique with the M basis vectors-without ever having to generate and evaluate each of the 2M code vectors themselves. Furthermore, only M basis vectors need to be stored in memory (114), as opposed to all 2M code vectors.
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公开(公告)号：DE69032026T2
公开(公告)日：1998-09-17
申请号：DE69032026
申请日：1990-05-02
Applicant: MOTOROLA INC
Inventor： GERSON IRA
Abstract: In a vector excitation source digital speech coder utilizing vector excitation, candidate excitation sources (111, 121) are considered independent of certain pitch parameters. Once a particular excitation source has been selected, the excluded pitch parameter may then be optimized, resulting in an overall improvement in speech quality.
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公开(公告)号：DE3855164T2
公开(公告)日：1996-10-10
申请号：DE3855164
申请日：1988-08-24
Applicant: MOTOROLA INC
Inventor： GERSON IRA , LINDSLEY BRETT
Abstract: A user-interactive speech recognition control system is disclosed for recognizing a complete sequence of keywords (e.g., a telephone number such as 123-4567) via entering, verifying, and editing variable-length utterance strings (e.g., 1-2-3; 4-5; 6-7) separated by the user-defined placement of pauses. The device controller (120) utilizes timers (124) to monitor the pause time between partial-sequence digit strings recognized by the speech recognizer (110). When a string of digits is followed by a predetermined pause time interval, the recognized digits will be replied via the speech synthesizer (130). An additional string of digits can then be entered, and only the subsequent string will be replied after the next pause. Furthermore, the user has the flexibility to correct only the last digit string entered, or the entire sequence. Hence, if there is an error in only one digit, the erroneous digit string can be corrected without having to re-enter the entire digit sequence. The invention is well-suited to be used in a hands-free voice command dialing system for a mobile radiotelephone, wherein vehicular background noise may affect recognition accuracy.
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公开(公告)号：DE3570569D1
公开(公告)日：1989-06-29
申请号：DE3570569
申请日：1985-09-03
Applicant: MOTOROLA INC
Inventor： BORTH DAVID , GERSON IRA , VILMUR RICHARD
IPC: G10L15/00 , G10L15/02 , G10L15/20 , G10L21/02 , H04M1/27 , H04M1/274 , H04M1/2745 , H04M1/60 , G10L7/08
Abstract: PCT No. PCT/US85/01672 Sec. 371 Date Sep. 3, 1985 Sec. 102(e) Date Sep. 3, 1985 PCT Filed Sep. 3, 1985 PCT Pub. No. WO87/01546 PCT Pub. Date Mar. 12, 1987.An improved hands-free user-interactive control and dialing system is disclosed for use with a speech communications device. The control system (400) includes a dynamic noise suppressor (410), a speech recognizer (420) for implementing voice-control, a device controller (430) responsive to the speech recognizer for controlling operating parameters of the speech communications device (450) and for producing status information representing the operating status of the device, and a speech synthesizer (440) for providing reply information to the user as to the speech communications device operating status. In a mobile radiotelephone application, the spectral subtraction noise suppressor (414) is configured to improve the performance of the speech recognizer (424), the voice quality of the transmitted audio (417), and the audio switching operation of the vehicular speakerphone (460). The combination of noise processing, speech recognition, and speech synthesis provides a substantial improvement to prior art control systems.
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Patent Agency Ranking
公开(公告)号：DE69033011D1
公开(公告)日：1999-04-22
申请号：DE69033011
申请日：1990-09-17
Applicant: MOTOROLA INC
Inventor： GERSON IRA , JASIUK MARK
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公开(公告)号：DE3853916T2
公开(公告)日：1995-12-14
申请号：DE3853916
申请日：1988-12-29
Applicant: MOTOROLA INC
Inventor： GERSON IRA
Abstract: An improved excitation vector generation and search technique (FIG. 1) is described for a code-excited linear prediction (CELP) speech coder (100) using a codebook of excitation code vectors. A set of M basis vectors Vm(n) are used along with the excitation signal codewords (i) to generate the codebook of excitation vectors ui(n) according to a "vector sum" technique (120) of converting the selector codewords into a plurality of interim data signals, multiplying the set of M basis vectors by the interim data signals, and summing the resultant vectors to produce the set of 2M codebook vectors. The entire codebook of 2M possible excitation vectors is efficiently searched by using the vector sum generation technique with the M basis vectors-without ever having to generate and evaluate each of the 2M code vectors themselves. Furthermore, only M basis vectors need to be stored in memory (114), as opposed to all 2M code vectors.
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公开(公告)号：DE3377599D1
公开(公告)日：1988-09-08
申请号：DE3377599
申请日：1983-12-22
Applicant: MOTOROLA INC
Inventor： GERSON IRA
IPC: G10L11/00 , G01R20060101 , G10L20060101 , G10L19/04 , G10L19/08 , H03H17/00 , H03H17/02 , H03H21/00 , H03K20060101 , H04B3/23 , G10L9/14
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公开(公告)号：DE69033011T2
公开(公告)日：2001-10-04
申请号：DE69033011
申请日：1990-09-17
Applicant: MOTOROLA INC
Inventor： GERSON IRA , JASIUK MARK
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公开(公告)号：DE3856280T2
公开(公告)日：1999-08-12
申请号：DE3856280
申请日：1988-09-22
Applicant: MOTOROLA INC
Inventor： VILMUR RICHARD , BARLO JOSEPH , GERSON IRA , LINDSLEY BRETT
Abstract: An improved noise suppression system (800) is disclosed which performs speech quality enhancement upon the speech-plus-noise signal available at the input (205) to generate a clean speech signal at the output (265) by spectral gain modification. The improvements of the present invention include the addition of a signal-to-noise ratio (SNR) threshold mechanism (830) to reduce background noise flutter by offsetting the gain rise of the gain tables until a certain SNR threshold is reached, the use of a voice metric calculator (810) to produce more accurate background noise estimates via performing the update decision based on the overall voice-like characteristics in the channels and the time interval since the last update, and the use of a channel SNR modifier (820) to provide immunity to narrowband noise bursts through modification of the SNR estimates based on the voice metric calculation and the channel energies.
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