公开(公告)号：CA1285994C

公开(公告)日：1991-07-09

申请号：CA582953

申请日：1988-11-14

Applicant: MOTOROLA INC

Inventor： SIWIAK KAZIMIERZ ,  KEBA JAMES M ,  STEEL FRANCIS R

IPC: G08B5/36 ,  B63B21/48 ,  G08B3/10 ,  H04L1/18 ,  H04W84/02 ,  G08B5/22

Abstract: An acknowledge back (ack-back) pager is provided for use in a paging system including a central station which transmits a group of message signals to a group of ack-back pagers which are addressed as a group. The users of the group of addressed ack-back pagers indicate a response to their respective pagers thus providing ack-back data. The pagers in the group of addressed ack-back pagers then simultaneously transmit back to the central station their ack-back data on different frequency sub-bands, a different frequency sub-band being allocated to each of the pagers in the group. To accurately control the ack-back transmit frequency, the pager receives and down-converts the FRX signal thus producing a down-converted FC signal, the frequency of which is measured and stored. The pager selects which sub-band of a plurality of frequency sub-bands within a predetermined range of frequencies is to be used for transmission of the ack-back signal. The pager determines a frequency offset FD corresponding to the selected sub-band, such offset being with respect to a predetermined frequency within such range of frequencies. The pager generates an acknowledge back signal at a frequency (FC + FD) FCTX and up-converts such signal to a transmit frequency FTX corresponding to said selected subband, FCTX being the frequency of a down-converted sample of the FTX signal.

公开(公告)号：AU2944589A

公开(公告)日：1989-08-01

申请号：AU2944589

申请日：1989-12-12

Applicant: MOTOROLA INC

Inventor： SIWIAK KAZIMIERZ ,  KEBA JAMES M ,  STEEL FRANCIS ROBERT

IPC: G08B5/36 ,  B63B21/48 ,  G08B3/10 ,  H04L1/18 ,  H04W84/02 ,  G08B5/22

Abstract: An acknowledge back (ack-back) pager is provided for use in a paging system including a central station which transmits a group of message signals to a group of ack-back pagers which are addressed as a group. The users of the group of addressed ack-back pagers indicate a response to their respective pagers thus providing ack-back data. The pagers in the group of addressed ack-back pagers then simultaneously transmit back to the central station their ack-back data on different frequency sub-bands, a different frequency sub-band being allocated to each of the pagers in the group. To accurately control the ack-back transmit frequency, the pager receives and down-converts the FRX signal thus producing a down-converted FC signal, the frequency of which is measured and stored. The pager selects which sub-band of a plurality of frequency sub-bands within a predetermined range of frequencies is to be used for transmission of the ack-back signal. The pager determines a frequency offset FD corresponding to the selected sub-band, such offset being with respect to a predetermined frequency within such range of frequencies. The pager generates an acknowledge back signal at a frequency (FC+FD)-FCTX and up-converts such signal to a transmit frequency FTX corresponding to said selected sub-band, FCTX being the frequency of a down-converted sample of the FTX signal.

公开(公告)号：AT127602T

公开(公告)日：1995-09-15

申请号：AT89901806

申请日：1988-12-12

Applicant: MOTOROLA INC

Inventor： SIWIAK KAZIMIERZ ,  KEBA JAMES M ,  STEEL FRANCIS ROBERT

IPC: G08B5/36 ,  B63B21/48 ,  G08B3/10 ,  H04L1/18 ,  H04W84/02 ,  G08B5/22

Abstract: An acknowledge back (ack-back) pager is provided for use in a paging system including a central station which transmits a group of message signals to a group of ack-back pagers which are addressed as a group. The users of the group of addressed ack-back pagers indicate a response to their respective pagers thus providing ack-back data. The pagers in the group of addressed ack-back pagers then simultaneously transmit back to the central station their ack-back data on different frequency sub-bands, a different frequency sub-band being allocated to each of the pagers in the group. To accurately control the ack-back transmit frequency, the pager receives and down-converts the FRX signal thus producing a down-converted FC signal, the frequency of which is measured and stored. The pager selects which sub-band of a plurality of frequency sub-bands within a predetermined range of frequencies is to be used for transmission of the ack-back signal. The pager determines a frequency offset FD corresponding to the selected sub-band, such offset being with respect to a predetermined frequency within such range of frequencies. The pager generates an acknowledge back signal at a frequency (FC+FD)-FCTX and up-converts such signal to a transmit frequency FTX corresponding to said selected sub-band, FCTX being the frequency of a down-converted sample of the FTX signal.

公开(公告)号：CA1309467C

公开(公告)日：1992-10-27

申请号：CA582956

申请日：1988-11-14

Applicant: MOTOROLA INC

Inventor： MOORE MORRIS A ,  KEBA JAMES M ,  WOOD CLIFFORD A

IPC: H04B1/10

Abstract: A paging receiver using LPC digital noise coding is shown to have a reduced volume or whisper mode of voice reconstruction for unobtrusive message reception. In addition, the alert signal to the user upon detection of a message may also be a reduced volume linguistic sound that is also unobtrusive but effective for the user.