公开(公告)号：JPH10126219A

公开(公告)日：1998-05-15

申请号：JP27940597

申请日：1997-09-29

Applicant: MOTOROLA INC

Inventor： LAROSA CHRISTOPHER P ,  SCHIRTZINGER TRACIE A

IPC: H03H21/00 ,  H03H17/02 ,  H03H17/06

Abstract: PROBLEM TO BE SOLVED: To provide the digital filter in which the number of gates and a power consumption level are reduced. SOLUTION: The digital filter, suitably used for a code division multiple access or other bust mode communication equipment, uses a standby coupling filter coefficient to reduce the complexity of the filter and the power consumption. The digital filter includes a coefficient storage circuit 216 that stores the standby coupling filter coefficient, a selection circuit 212 that responds to an input signal to select a proper standby coupling filter coefficient and a coupling circuit 214, that couples proper standby coupling filter coefficients to generate a filter signal.

公开(公告)号：CA2216128A1

公开(公告)日：1998-04-04

申请号：CA2216128

申请日：1997-09-23

Applicant: MOTOROLA INC

Inventor： SCHIRTZINGER TRACIE A ,  LAROSA CHRISTOPHER P

IPC: H03H21/00 ,  H03H17/02 ,  H03H17/06

Abstract: A digital filter (200) suitable for use in a CDMA or other burst-mode communication device (100) employs precombining of filter coefficients to reduce filter complexity and power dissipation. The digital filter (200) includes a coefficient storage circuit (216) for storing the precombined coefficients, a selection circuit (212) for selecting appropriate precombined coefficients in response to the input signal and a combining circuit (214) for combining the appropriate precombined coefficients to produce a filtered signal.

公开(公告)号：GB2318005B

公开(公告)日：2001-02-21

申请号：GB9720004

申请日：1997-09-22

Applicant: MOTOROLA INC

Inventor： LAROSA CHRISTOPHER P ,  SCHIRTZINGER TRACIE A

IPC: H03H21/00 ,  H03H17/02 ,  H03H17/06

Abstract: A digital filter (200) suitable for use in a CDMA or other burst-mode communication device (100) employs precombining of filter coefficients to reduce filter complexity and power dissipation. The digital filter (200) includes a coefficient storage circuit (216) for storing the precombined coefficients, a selection circuit (212) for selecting appropriate precombined coefficients in response to the input signal and a combining circuit (214) for combining the appropriate precombined coefficients to produce a filtered signal.

公开(公告)号：MX9707599A

公开(公告)日：1998-04-30

申请号：MX9707599

申请日：1997-10-03

Applicant: MOTOROLA INC

Inventor： LAROSA CHRISTOPHER P ,  SCHIRTZINGER TRACIE A

IPC: H03H21/00 ,  H03H17/02 ,  H03H17/06 ,  G01T7/00 ,  H04B1/10

Abstract: Un filtro digital (200) adecuado para utilizarse en un dispositivo de comunicacion de acceso multiple de division de codigo o en otro dispositivo de comunicacion en modo de ráfaga (100) emplea la precombinacion de coeficientes de filtro para reducir la complejidad del filtro y la disipacion de energía. El filtro digital (200) incluye un circuito de almacenamiento de coeficientes (216) para almacenar los coeficientes previamente combinados, un circuito de seleccion (212) para seleccionar los coeficientes previamente combinados apropiados en respuesta a la señal de entrada, y un circuito de combinacion (214) para combinar los coeficiente previamente combinados apropiados para producir una señal filtrada.

公开(公告)号：CA2216128C

公开(公告)日：2000-04-11

申请号：CA2216128

申请日：1997-09-23

Applicant: MOTOROLA INC

Inventor： LAROSA CHRISTOPHER P ,  SCHIRTZINGER TRACIE A

IPC: H03H21/00 ,  H03H17/02 ,  H03H17/06

Abstract: A digital filter (200) suitable for use in a CDMA or other burst-mode communication device (100) employs precombining of filter coefficients to reduce filter complexity and power dissipation. The digital filter (200) includes a coefficient storage circuit (216) for storing the precombined coefficients, a selection circuit (212) for selecting appropriate precombined coefficients in response to the input signal and a combining circuit (214) for combining the appropriate precombined coefficients to produce a filtered signal.

公开(公告)号：GB2352937B

公开(公告)日：2002-01-16

申请号：GB0011792

申请日：2000-05-16

Applicant: MOTOROLA INC

Inventor： LAROSA CHRISTOPHER P ,  STORM BRIAN D ,  CARNEY MICHAEL J ,  SCHIRTZINGER TRACIE A

IPC: H04B1/16 ,  H04B1/7075 ,  H04B7/26 ,  H04M1/00 ,  H04M1/73 ,  H04Q7/38

Abstract: A method of activating a radiotelephone operable in a spread-spectrum multiple access radiotelephone system. A searcher receiver ( 114 ) is activated, and the searcher receiver ( 114 ) acquires a PN sequence timing of a pilot signal. At least one demodulation branch ( 122 ) is activated after activation of the searcher receiver ( 114 ), and the demodulation branch synchronizes to the PN sequence timing of the selected pilot signal after the searcher receiver ( 114 ) has acquired the PN sequence timing.

公开(公告)号：GB2352937A8

公开(公告)日：2001-04-23

申请号：GB0011792

申请日：2000-05-16

Applicant: MOTOROLA INC

Inventor： LAROSA CHRISTOPHER P ,  STORM BRIAN D ,  CARNEY MICHAEL J ,  SCHIRTZINGER TRACIE A

IPC: H04B1/16 ,  H04B1/7075 ,  H04B7/26 ,  H04M1/00 ,  H04M1/73 ,  H04Q7/38

Abstract: A method of activating a radiotelephone operable in a spread-spectrum multiple access radiotelephone system. A searcher receiver ( 114 ) is activated, and the searcher receiver ( 114 ) acquires a PN sequence timing of a pilot signal. At least one demodulation branch ( 122 ) is activated after activation of the searcher receiver ( 114 ), and the demodulation branch synchronizes to the PN sequence timing of the selected pilot signal after the searcher receiver ( 114 ) has acquired the PN sequence timing.

公开(公告)号：BR9704950A

公开(公告)日：1998-12-01

申请号：BR9704950

申请日：1997-10-01

Applicant: MOTOROLA INC

Inventor： SCHIRTZINGER TRACIE A ,  LAROSA CHRISTOPHER P

IPC: H03H21/00 ,  H03H17/02 ,  H03H17/06 ,  H04Q7/32

Abstract: A digital filter (200) suitable for use in a CDMA or other burst-mode communication device (100) employs precombining of filter coefficients to reduce filter complexity and power dissipation. The digital filter (200) includes a coefficient storage circuit (216) for storing the precombined coefficients, a selection circuit (212) for selecting appropriate precombined coefficients in response to the input signal and a combining circuit (214) for combining the appropriate precombined coefficients to produce a filtered signal.

公开(公告)号：GB2318005A

公开(公告)日：1998-04-08

申请号：GB9720004

申请日：1997-09-22

Applicant: MOTOROLA INC

Inventor： LAROSA CHRISTOPHER P ,  SCHIRTZINGER TRACIE A

IPC: H03H21/00 ,  H03H17/02 ,  H03H17/06

Abstract: A digital filter suitable for use in a CDMA or other burst-mode communication device employs precombining of filter coefficients to reduce filter complexity and power dissipation. The digital filter includes a coefficient storage circuit 216 for storing the precombined coefficients, a selection circuit 212 for selecting appropriate precombined coefficients in response to the input signal and a combining circuit 214 for combining the appropriate precombined coefficients to produce a filtered signal.