公开(公告)号：DE69934706D1

公开(公告)日：2007-02-15

申请号：DE69934706

申请日：1999-10-12

Applicant: QUALCOMM INC

Inventor： BUTLER K ,  ZHANG HAITAO ,  TIEDEMANN G ,  ZOU QIUZHEN ,  SIH C ,  AGRAWAL AVNEESH

IPC: H04W24/02 ,  H04B1/7075 ,  H04B1/7077 ,  H04B1/7115 ,  H04W52/02

Abstract: A novel and improved method for performing paging is described. In one embodiment of the invention a searcher is used to detect spread spectrum signals. Samples received RF signals are stored in a sample buffer. During standby mode, the samples are gathered during paging slots assigned to the mobile. A set of searches are performed on the samples, and if pilot signals are detected additional demodulation is performed to detect paging messages. The resulting set of demodulation data may be combined to increase detection. After a page message has been detected, additional demodulation resources may be activated to processes more complete page messages, or other information channels. In one embodiment of the invention, the searcher includes a demodulator to perform quick page detection without the use of finger elements to reduce idle mode power consumption.

公开(公告)号：DE69835347D1

公开(公告)日：2006-09-07

申请号：DE69835347

申请日：1998-03-18

Applicant: QUALCOMM INC

Inventor： SIH C ,  GUPTA SAMIR

IPC: H04B3/23 ,  H04M1/58 ,  H04M1/715 ,  H04M9/08 ,  H04W88/06

Abstract: A method and apparatus for canceling both earseal and hybrid echo in a Wireless Local Loop telephone system is disclosed. The present invention operates within a subscriber station having a plurality of telephone inputs, one of which is a dedicated handset and at least one other input being a standard analog telephone. During a conference call between a far end speaker and two near end speakers, the far end speaker may hear an echo of his own voice due to an earseal echo generated by the dedicated handset and a hybrid echo generated by a 4-to-2 wire hybrid interface within the subscriber station. In accordance with the present invention, two distinct echo cancellers are used in the subscriber station to reduce the two types of echo. A first echo canceller is optimized to remove the earseal echo generated at the dedicated handset while a second echo canceller is optimized to remove the hybrid echo generated at the 4-to-2 wire hybrid. The two echo cancellers operate independently such that neither echo canceller need adapt its filter coefficients when a change in the echo channel characteristics occur, such as when a speaker hangs up or another speaker joins the conversation.

公开(公告)号：DE69919729D1

公开(公告)日：2004-09-30

申请号：DE69919729

申请日：1999-09-03

Applicant: QUALCOMM INC

Inventor： KANG INYUP ,  SIH C ,  ZOU QIUZHEN

IPC: G01S5/00 ,  G01S19/23 ,  G01S19/25 ,  G01S19/29 ,  G01S19/30 ,  H04Q7/34 ,  G01S5/14

Abstract: The present invention is a novel and improved method and apparatus for performing position location in wireless communications system. One embodiment of the invention comprises a method for performing position location comprising the steps of receiving signal samples, generating a coarse acquisition sequence, rotating the coarse acquisition sequence yielding a rotated coarse acquisition sequence, and applying the rotated coarse acquisition sequence to the signal samples at a set of time offsets yielding correlated output data.

公开(公告)号：DE69916255D1

公开(公告)日：2004-05-13

申请号：DE69916255

申请日：1999-02-03

Applicant: QUALCOMM INC

Inventor： SIH C ,  BI NING C O QUALCOMM INCORPORA

IPC: G10L21/0208 ,  G10L15/02 ,  G10L15/06 ,  G10L15/10 ,  G10L15/20 ,  G10L21/0216

Abstract: The speech recognition training unit is modified to store digitized speech samples into a speech database that can be accessed at recognition time. The improved recognition unit comprises a noise analysis, modeling, and synthesis unit which continually analyzes the noise characteristics present in the audio environment and produces an estimated noise signal with similar characteristics. The recognition unit then constructs a noise-compensated template database by adding the estimated noise signal to each of the speech samples in the speech database and performing parameter determination on the resulting sums. This procedure accounts for the presence of noise in the recognition phase by retraining all the templates using an estimated noise signal with similar characteristics as the actual noise signal that corrupted the word to be recognized. This method improves the likelihood of a good template match, which increases the recognition accuracy.