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公开(公告)号：FR2739481B1
公开(公告)日：1999-02-26
申请号：FR9611654
申请日：1996-09-25
Applicant: MOTOROLA INC
Inventor： MCLAUGHLIN MICHAEL , RAMABADRAN TENKASI V
Abstract: A signal that includes noise (301) is sampled to provide a plurality of digital information samples (303). A predetermined number of the digital information samples are grouped as a set (305). Noise suppression is performed on the signal using the following steps. One or more digital representations of silence is attached to the set, forming an extended set (401). A Fourier transform is performed on the extended set, yielding a set of frequency domain coefficients (403), at least some of which are scaled (405). An inverse Fourier transform is performed on the set of scaled frequency domain coefficients to provide a set of time domain samples (407), which are partially overlapped in time and added with a previously formed set of time domain samples (409 and 411), which result is provided with the non-overlapping time domain samples as a noise suppressed version of the signal (413).
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公开(公告)号：DK163700C
公开(公告)日：1992-08-10
申请号：DK176784
申请日：1984-04-03
Applicant: MOTOROLA INC
Inventor： MCLAUGHLIN MICHAEL
IPC: H04B17/00 , H04B20060101 , H04B7/08 , H04B7/26
Abstract: A method and apparatus for measuring the strength of a radio frequency (RF) signal subject to Rayleigh fading. The strength of the RF signal is sampled two or more times during a predetermined time interval and the sampled signal strength having the largest magnitude is selected. The selected signal strength is a reasonably accurate measure of the signal strength since the true average strength of a Rayleigh fading signal is close to its peak signal strength. The inventive method and apparatus is particularly well adapted for use in a scanning receiver located in a base station radio (111, 121, 131) of a cellular radiotelephone communications system. The scanning receiver includes an antenna selector (102) for selecting one of a plurality of sector antennas, an RF signal receiver (104) tunable to a plurality of different RF signal frequencies, an analog-to-digital converter (106) for converting RF signal strength samples to a binary data signal and a microprocessor (114) together with peripheral devices (108, 110, 112, 116, 118, 120) for controlling the operation of the antenna selector (102), RF signal receiver (104) and analog-to-digital converter (106).
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公开(公告)号：NO161890C
公开(公告)日：1989-10-04
申请号：NO841285
申请日：1984-04-02
Applicant: MOTOROLA INC
Inventor： MCLAUGHLIN MICHAEL
IPC: H04B17/00 , H04B20060101 , H04B7/08 , H04B7/26
Abstract: A method and apparatus for measuring the strength of a radio frequency (RF) signal subject to Rayleigh fading. The strength of the RF signal is sampled two or more times during a predetermined time interval and the sampled signal strength having the largest magnitude is selected. The selected signal strength is a reasonably accurate measure of the signal strength since the true average strength of a Rayleigh fading signal is close to its peak signal strength. The inventive method and apparatus is particularly well adapted for use in a scanning receiver located in a base station radio (111, 121, 131) of a cellular radiotelephone communications system. The scanning receiver includes an antenna selector (102) for selecting one of a plurality of sector antennas, an RF signal receiver (104) tunable to a plurality of different RF signal frequencies, an analog-to-digital converter (106) for converting RF signal strength samples to a binary data signal and a microprocessor (114) together with peripheral devices (108, 110, 112, 116, 118, 120) for controlling the operation of the antenna selector (102), RF signal receiver (104) and analog-to-digital converter (106).
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公开(公告)号：DK176784D0
公开(公告)日：1984-04-03
申请号：DK176784
申请日：1984-04-03
Applicant: MOTOROLA INC
Inventor： MCLAUGHLIN MICHAEL
IPC: H04B17/00 , H04B20060101 , H04B7/08 , H04B7/26 , G01R
Abstract: A method and apparatus for measuring the strength of a radio frequency (RF) signal subject to Rayleigh fading. The strength of the RF signal is sampled two or more times during a predetermined time interval and the sampled signal strength having the largest magnitude is selected. The selected signal strength is a reasonably accurate measure of the signal strength since the true average strength of a Rayleigh fading signal is close to its peak signal strength. The inventive method and apparatus is particularly well adapted for use in a scanning receiver located in a base station radio (111, 121, 131) of a cellular radiotelephone communications system. The scanning receiver includes an antenna selector (102) for selecting one of a plurality of sector antennas, an RF signal receiver (104) tunable to a plurality of different RF signal frequencies, an analog-to-digital converter (106) for converting RF signal strength samples to a binary data signal and a microprocessor (114) together with peripheral devices (108, 110, 112, 116, 118, 120) for controlling the operation of the antenna selector (102), RF signal receiver (104) and analog-to-digital converter (106).
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公开(公告)号：GB2348092A
公开(公告)日：2000-09-20
申请号：GB0000688
申请日：2000-01-12
Applicant: MOTOROLA INC
Inventor： LI TOM HONG , MCLAUGHLIN MICHAEL
Abstract: A filter (202) generates an echo estimate z(n) at an output (209), a subtractor (204) generates an echo cancelled signal r(n) at an output (105) for transmission, a filter control (208) provides updated coefficients w(n) at an output (207) for the filter (202), and a time manager (210) sends a control signal t(n) to the filter control (208). The time manager (210) assigns intervals for step size adaptation during which an adaptive step size filter control (500) is chosen whereas another filter control (400, fig 4) is used outside of the assigned adaptation interval. During the assigned time interval for step size adaptation, adaptive filters (502-504) generate echo residual signal B s (n), B m (n), B L (n) corresponding to different steps sizes and the step size is chosen which is the one corresponding to the adaptive filter with the smallest echo residual energy. The adaptive step size can be employed in each adaptive filter of a subband echo canceller (300 fig 3).
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Patent Agency Ranking
公开(公告)号：GB2305831B
公开(公告)日：1999-10-20
申请号：GB9619601
申请日：1996-09-19
Applicant: MOTOROLA INC
Inventor： MCLAUGHLIN MICHAEL , RAMABADRAN TENKASI V
Abstract: A signal that includes noise (301) is sampled to provide a plurality of digital information samples (303). A predetermined number of the digital information samples are grouped as a set (305). Noise suppression is performed on the signal using the following steps. One or more digital representations of silence is attached to the set, forming an extended set (401). A Fourier transform is performed on the extended set, yielding a set of frequency domain coefficients (403), at least some of which are scaled (405). An inverse Fourier transform is performed on the set of scaled frequency domain coefficients to provide a set of time domain samples (407), which are partially overlapped in time and added with a previously formed set of time domain samples (409 and 411), which result is provided with the non-overlapping time domain samples as a noise suppressed version of the signal (413).
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公开(公告)号：GB2305831A
公开(公告)日：1997-04-16
申请号：GB9619601
申请日：1996-09-19
Applicant: MOTOROLA INC
Inventor： MCLAUGHLIN MICHAEL , RAMABADRAN TENKASI V
Abstract: A signal that includes noise is sampled to provide a plurality of digital information samples. A predetermined number of the digital information samples are grouped as a set. Noise suppression is performed on the signal using the following steps. One or more digital representations of silence is attached to the set, forming an extended set (401). A Fourier transform is performed on the extended set, yielding a set of frequency domain coefficients (403), at least some of which are scaled (405). An inverse Fourier transform is performed on the set of scaled frequency domain coefficients to provide a set of time domain samples (407), which are partially overlapped in time and added with a previously formed set of time domain samples (409 and 411), which result is provided with the non-overlapping time domain samples as a noise suppressed version of the signal (413).
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公开(公告)号：NO841285L
公开(公告)日：1984-04-02
申请号：NO841285
申请日：1984-04-02
Applicant: MOTOROLA INC
Inventor： MCLAUGHLIN MICHAEL
IPC: H04B17/00 , H04B20060101 , H04B7/08 , H04B7/26 , H04B
Abstract: A method and apparatus for measuring the strength of a radio frequency (RF) signal subject to Rayleigh fading. The strength of the RF signal is sampled two or more times during a predetermined time interval and the sampled signal strength having the largest magnitude is selected. The selected signal strength is a reasonably accurate measure of the signal strength since the true average strength of a Rayleigh fading signal is close to its peak signal strength. The inventive method and apparatus is particularly well adapted for use in a scanning receiver located in a base station radio (111, 121, 131) of a cellular radiotelephone communications system. The scanning receiver includes an antenna selector (102) for selecting one of a plurality of sector antennas, an RF signal receiver (104) tunable to a plurality of different RF signal frequencies, an analog-to-digital converter (106) for converting RF signal strength samples to a binary data signal and a microprocessor (114) together with peripheral devices (108, 110, 112, 116, 118, 120) for controlling the operation of the antenna selector (102), RF signal receiver (104) and analog-to-digital converter (106).
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公开(公告)号：DK163700B
公开(公告)日：1992-03-23
申请号：DK176784
申请日：1984-04-03
Applicant: MOTOROLA INC
Inventor： MCLAUGHLIN MICHAEL
IPC: H04B17/00 , H04B20060101 , H04B7/08 , H04B7/26
Abstract: A method and apparatus for measuring the strength of a radio frequency (RF) signal subject to Rayleigh fading. The strength of the RF signal is sampled two or more times during a predetermined time interval and the sampled signal strength having the largest magnitude is selected. The selected signal strength is a reasonably accurate measure of the signal strength since the true average strength of a Rayleigh fading signal is close to its peak signal strength. The inventive method and apparatus is particularly well adapted for use in a scanning receiver located in a base station radio (111, 121, 131) of a cellular radiotelephone communications system. The scanning receiver includes an antenna selector (102) for selecting one of a plurality of sector antennas, an RF signal receiver (104) tunable to a plurality of different RF signal frequencies, an analog-to-digital converter (106) for converting RF signal strength samples to a binary data signal and a microprocessor (114) together with peripheral devices (108, 110, 112, 116, 118, 120) for controlling the operation of the antenna selector (102), RF signal receiver (104) and analog-to-digital converter (106).
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公开(公告)号：NO841285A
公开(公告)日：1984-04-02
申请号：NO841285
申请日：1984-04-02
Applicant: MOTOROLA INC
Inventor： MCLAUGHLIN MICHAEL
IPC: H04B17/00 , H04B20060101 , H04B7/08 , H04B7/26 , H04B
CPC classification number: H04B7/0808 , H04B7/0805
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