公开(公告)号：DK175639B1

公开(公告)日：2005-01-03

申请号：DKPA200400536

申请日：2004-04-02

Applicant: INTERDIGITAL TECH CORP

Inventor： CRITCHLOW DAVID N ,  GRAHAM AVIS M ,  EARLAM SANDRA J K ,  JOHNSON KARLE J ,  SMETANA BRUCE A ,  WESTLING GREGORY L

IPC: H04B1/38 ,  H04B7/26 ,  H04M3/42 ,  H04W74/04 ,  H04Q7/20

Abstract: A base-band processor provides control of conversion of PCM signals at one bit rate to other bit rates. It converts received digital signals to voice signals and vice versa. It also provides echo cancellation where it uses dynamic memory to store received signals. PROM's store the echo cancellation program information as well as that for utilisation of the processor as a control processor. As a control processor it signals to the frequency synthesiser the frequency of operation for communication to the base station. The processor is directly coupled to a modem processor which is able to access the base band processor memory. This processor sends its signal at a predetermined sampling rate which are converted to analogue signals. The analogue signals are subjected to a cancellation process to reduce distortion. These signals are converted to an IF for addition to the synthesiser frequency to result in an HF signal for transmission.

公开(公告)号：DK200400536A

公开(公告)日：2004-04-02

申请号：DKPA200400536

申请日：2004-04-02

Applicant: INTERDIGITAL TECH CORP

Inventor： CRITCHLOW DAVID N ,  GRAHAM AVIS M ,  EARLAM SANDRA J K ,  JOHNSON KARLE J ,  SMETANA BRUCE A ,  WESTLING GREGORY L

IPC: H04B1/38 ,  H04B7/26 ,  H04M3/42 ,  H04W74/04 ,  H04Q7/20

Abstract: A base-band processor provides control of conversion of PCM signals at one bit rate to other bit rates. It converts received digital signals to voice signals and vice versa. It also provides echo cancellation where it uses dynamic memory to store received signals. PROM's store the echo cancellation program information as well as that for utilisation of the processor as a control processor. - As a control processor it signals to the frequency synthesiser the frequency of operation for communication to the base station. The processor is directly coupled to a modem processor which is able to access the base band processor memory. This processor sends its signal at a predetermined sampling rate which are converted to analogue signals. The analogue signals are subjected to a cancellation process to reduce distortion. These signals are converted to an IF for addition to the synthesiser frequency to result in an HF signal for transmission.