公开(公告)号：JP2001257632A

公开(公告)日：2001-09-21

申请号：JP2001029466

申请日：2001-02-06

Applicant: MOTOROLA INC

Inventor： BORTH DAVID EDWARD

IPC: H04J3/00 ,  H04B3/10 ,  H04B7/005 ,  H04B7/26 ,  H04L7/02 ,  H04L7/04 ,  H04Q7/38

Abstract: PROBLEM TO BE SOLVED: To provide a TDMA communication system that reduces multi-path distortion. SOLUTION: The communication system of this application is provided with a transmission station that applies time multiplexing to a user message with other message and with a reception station that re-inserts different delay to compensate inter-symbol interference. Each user inputs digital signals 112, 122 and 132 to corresponding equalizer synchronous word blocks 110, 120 and 130. A TDMA controller 140 applies time-multiplex to each user message with other user message to generate a TDMA signal 145. A transmitter 150 transmits the signal 145. A received TDMA signal 225 received by a receiver 220 is applied to a data buffer 230 and a TDMA controller 240. The controller 240 selects a specific user slot on the basis of the signal 225. An equalizer 250 applies time delay spread equalization to a stored user message 235 to output data of a specific user.

公开(公告)号：EP0255523A4

公开(公告)日：1988-06-23

申请号：EP87900604

申请日：1986-12-22

Applicant: MOTOROLA INC

Inventor： BORTH DAVID EDWARD ,  GERSON IRA ALAN ,  LINDSLEY BRETT LOUIS

IPC: G10L13/00 ,  G10L13/04 ,  G10L15/22 ,  H04M1/27 ,  H04M1/60 ,  G10L5/00

CPC classification number: G10L15/22 ,  G10L13/00 ,  H04M1/271 ,  H04M1/6041

Abstract: A user-interactive control system for an electronic device which synthesizes speech from speech recognition templates to generate voice reply feedback to the user indicative of which template word was recognized. The acoustic features of the user-spoken speech are extracted by the acoustic processor (110) and applied to the training processor (170) to generate word recognition templates stored in the template memory (160). Recognition processor (120) compares the user-spoken features to the recognition templates to provide voice command data for the device controller (130) which controls the operating parameters of the electronic device (150). The device controller also produces device status data for the synthesis processor (140) which synthesizes a speech reply signal from the word recognition templates. In the preferred embodiment, a hands-free user-interactive control system for a mobile radiotelephone is provided utilizing speech synthesis from speech recognition templates.

Abstract translation: 一种用于电子设备的用户交互式控制系统，其合成来自语音识别模板的语音以生成对用户的语音回复反馈，以指示哪个模板字被识别。 声学处理器（110）提取用户口头语音的声学特征并将其应用于训练处理器（170）以生成存储在模板存储器（160）中的单词识别模板。 识别处理器（120）将用户说出的特征与识别模板进行比较，以为控制电子设备（150）的操作参数的设备控制器（130）提供语音命令数据。 设备控制器还产生用于合成来自单词识别模板的语音应答信号的合成处理器（140）的设备状态数据。 在优选实施例中，利用来自语音识别模板的语音合成来提供用于移动无线电话的免提用户交互式控制系统。

公开(公告)号：EP0255524A4

公开(公告)日：1988-06-23

申请号：EP87900607

申请日：1986-12-22

Applicant: MOTOROLA INC

Inventor： BORTH DAVID EDWARD ,  GERSON IRA ALAN ,  VILMUR RICHARD JOSEPH ,  LINDSLEY BRETT LOUIS

IPC: G10L13/00 ,  G10L19/02 ,  G10L5/00

CPC classification number: G10L19/02

Abstract: A channel bank speech synthesizer for reconstructing speech from externally-generated acoustic feature information without using externally-generated voicing or pitch information is disclosed. An N-channel pitch-excited channel bank synthesizer (340) is provided having a first low-frequency group of channel gain values (1 to M) and a second high-frequency group of channel gain values (+1 to N). The first group controls a first group of amplitude modulators (950) excited by a periodic pitch pulse source (920), and the second group controls amplitude modulators excited by a noise source (930). Both groups of modulated excitation signals are applied to the bandpass filters (960) to reconstruct the speech channels, and then combined at the summation network (970) to form a reconstructed synthesized speech signal. Additionally, the pitch pulse source (920) varies the pitch pulse period such that the pitch pulse rate decreases over the length of the word.

公开(公告)号：EP0226613A4

公开(公告)日：1988-06-14

申请号：EP86903767

申请日：1986-05-05

Applicant: MOTOROLA INC

Inventor： BORTH DAVID EDWARD ,  GERSON IRA ALAN ,  VILMUR RICHARD JOSEPH ,  SMANSKI PHILIP JEROME

IPC: G10K11/178 ,  G10L21/0208 ,  G10L21/0216 ,  G10L25/27 ,  H04R25/00 ,  H04R27/00 ,  H03G3/34

CPC classification number: G10L21/0208 ,  G10L25/27 ,  G10L2021/02168 ,  H04R25/505 ,  H04R27/00 ,  H04R2225/43

Abstract: An improved noise suppression system (400) which performs speech quality enhancement upon speech-plus-noise signal available at the input (205) to generate a clean speech signal at the output (265) by spectral gain modification. The noise suppression system includes a background noise estimator (420) which generates and stores an estimate of the background noise power spectral density based upon pre-processed speech (215), as determined by the detected minima of the post-processed speech energy level. This post-processed speech (255) may be obtained directly from the output of the noise supression system, or may be simulated by multiplying the pre-processed speech energy (225) by the channel gain values of the modification signal (245). The channel gain controller (240) produces these individual channel gain values for application to both the channel gain modifier (250) and the background noise estimator (420). Each individual channel gain value is selected as a function of (a) the channel number, (b) the current channel SNR estimate, and (c) the overall average background noise level. The technique of implementing post-processed signal to generate the background noise estimate (325) provides a more accurate measurement of the background noise energy since it is based upon much cleaner speech signal. As a result, the present invention performs acoustic noise suppression in high ambient noise backgrounds with significantly less voice quality degradation.

公开(公告)号：IE80438B1

公开(公告)日：1998-07-15

申请号：IE329590

申请日：1990-09-11

Applicant: MOTOROLA INC

Inventor： LABEDZ GERALD PAUL ,  BORTH DAVID EDWARD ,  RASKY PHILIP DAVID

IPC: H04L25/08 ,  H04L25/03 ,  H04L27/00 ,  H04L27/01 ,  H04L25/30 ,  H03M13/00

Abstract: In a communications network having time-dispersed signals, there is provided a mechanism for soft decision decoding. It comprises: radio reception of a time-dispersed signal, at least partly equalizing those time-dispersal effects, recovering information contained in the signal, multiplying with that recovered information the absolute value of that at-least-partly-equalized signal (scaled by a number derived from channel conditions over a time during which at least part of the information to be recovered is distributed), and error-correcting the multiplied information by a Viterbi algorithm channel decoding scheme of error correction. Accordingly, soft decision information is generated from within the equalization process itself.

公开(公告)号：HK99897A

公开(公告)日：1997-08-08

申请号：HK99897

申请日：1997-06-26

Applicant: MOTOROLA INC

Inventor： BORTH DAVID EDWARD ,  WANG CHIH-FEI ,  RABE DUANE C ,  LABEDZ GERALD PAUL

IPC: H04L27/22 ,  H04B7/185 ,  H04B7/26 ,  H04J3/00 ,  H04L7/04

公开(公告)号：HK18797A

公开(公告)日：1997-02-20

申请号：HK18797

申请日：1997-02-20

Applicant: MOTOROLA INC

Inventor： BORTH DAVID EDWARD

IPC: H04J3/00 ,  H04B3/10 ,  H04B7/005 ,  H04B7/26 ,  H04L7/02 ,  H04L7/04 ,  H04Q7/38 ,  H04J3/06

Abstract: Method and means for reducing multipath interference distortion in a time-division multiple access (TDMA) communications system. A transmitting station (100) formats one or more equalizer synchronization words with a first user's data word, time-multiplexes this formatted user message with at least one other user message, and transmits the combined signal. The receiving station (200) receives the transmitted TDMA signal in a receiver (220), de-multiplexes the first user message from the other user messages in the TDMA controller (240), and the equalizer (250) equalizes the time delay spread characteristics of the data word portion of the first user message (or a stored version of such) in response to this de-multiplexing. Performing the adaptive equalization process more than once per user time slot provides an even higher data throughput for the system. Storing the first user message in a data buffer (230) permits the adaptive equalization process to be performed in non-real time, thereby lowering the required signal processing data rate in any particular receiver.

公开(公告)号：DK0495006T3

公开(公告)日：1996-12-23

申请号：DK90916969

申请日：1990-09-24

Applicant: MOTOROLA INC

Inventor： BORTH DAVID EDWARD ,  LABEDZ GERALD PAUL ,  RASKY PHILLIP DAVID

IPC: H04L25/08 ,  H04L25/03 ,  H04L27/00 ,  H04L27/01 ,  H04B3/06

Abstract: In a communications network having time-dispersed signals, there is provided a mechanism for soft decision decoding. It comprises: radio reception of a time-dispersed signal, at least partly equalizing those time-dispersal effects, recovering information contained in the signal, multiplying with that recovered information the absolute value of that at-least-partly-equalized signal (scaled by a number derived from channel conditions over a time during which at least part of the information to be recovered is distributed), and error-correcting the multiplied information by a Viterbi algorithm channel decoding scheme of error correction. Accordingly, soft decision information is generated from within the equalization process itself.

公开(公告)号：CA2062776C

公开(公告)日：1996-06-04

申请号：CA2062776

申请日：1991-04-09

Applicant: MOTOROLA INC

Inventor： ARENS JOHN WILLIAM ,  BORTH DAVID EDWARD ,  KEPLER JAMES FRANK MICHAEL

IPC: H04B1/16 ,  H03G3/20 ,  H04B1/30 ,  H04B7/005 ,  H04L27/14 ,  H04L27/22

Abstract: There is provided a mechanism for Automatic Gain Control in a receiver. It comprises: determining, within a certain dynamic range, the difference in power between the desired signal and a signal received, and providing open loop gain control for the signal in response to the differential so determined, scaled by the receiver's gain characteristics, such that the signal is positioned within dynamic range so as to reduce saturation and noise.

公开(公告)号：ES2075844T3

公开(公告)日：1995-10-16

申请号：ES89121747

申请日：1989-12-11

Applicant: MOTOROLA INC

Inventor： BORTH DAVID EDWARD ,  KEPLER JAMES FRANK MICHAEL

IPC: H04L27/14 ,  H04L27/00 ,  H04L27/18 ,  H04L27/227 ,  H04L27/22

Abstract: There is provided a method of and apparatus for Automatic Frequency Control (AFC) in the presence of data. It comprises removing the effects of data modulated onto the carrier (25), detecting the frequency difference between the carrier frequency and the phase of the reference oscillator (30), and adjusting (80) the frequency of the reference oscillator (35) to eliminate the frequency difference ( DELTA ). It is further characterized by digitizing (40) the modulated carrier in quadrature, sampling (20) the modulated carrier in quadrature at a multiple of the modulated bit rate, rotating phases toward arctangent (I/Q)=0 (25/55/60) to remove the effects of quadrature data (I/Q) modulated onto the carrier, detecting (30) the frequency difference ( DELTA ) between the carrier frequency and the frequency of a Voltage Controlled type of reference oscillator (35) with a phase trajectory estimator (45), and establishing and generating the requisite correction voltage ( DELTA ) for a Voltage Controlled type of reference oscillator (VCO) (35) with the phase trajectory estimator (45).