公开(公告)号：WO9912276A3

公开(公告)日：1999-05-27

申请号：PCT/SE9801546

申请日：1998-08-31

Applicant: ERICSSON TELEFON AB L M ,  GNOSSPELIUS JOHAN ,  SOERQVIST PATRIK

Inventor： GNOSSPELIUS JOHAN ,  SOERQVIST PATRIK

IPC: H04B3/20 ,  H04M7/00

CPC classification number: H04B3/20 ,  H04M7/006

Abstract: The present invention relates to a cost-effective way of minimizing an echo arising in the PSTN network in a connection at least partially connected through a digital network, with minimum processor capacity required but still maintaining a high quality. The object of the present invention is to minimize, in a cost effective way, the echo while minimizing the processing requirements. The above problem of minimizing an echo arising in an analogue part of a connection is solved by switching to prevent the sound from passing from the analogue to the digital side.

Abstract translation: 本发明涉及一种成本有效的方式，使在PSTN网络中产生的回声在至少部分地通过数字网络连接的同时，以最小的处理器容量需要但仍保持高质量来最小化。 本发明的目的是以成本有效的方式最小化回波，同时最小化处理要求。 通过切换来解决在连接的模拟部分中产生的回波最小化的上述问题，以防止声音从模拟到数字方。

公开(公告)号：SE9600363L

公开(公告)日：1997-08-02

申请号：SE9600363

申请日：1996-02-01

Applicant: ERICSSON TELEFON AB L M

Inventor： HAENDEL PETER ,  SOERQVIST PATRIK

IPC: G10L21/0208 ,  H03H21/00 ,  G10L3/02 ,  G10L9/14

Abstract: Noisy speech parameters are enhanced by determining a background noise power spectral density (PSD) estimate, determining noisy speech parameters, determining a noisy speech PSD estimate from the speech parameters, subtracting a background noise PSD estimate from the noisy speech PSD estimate, and estimating enhanced speech parameters from the enhanced speech PSD estimate.

公开(公告)号：SE9600363D0

公开(公告)日：1996-02-01

申请号：SE9600363

申请日：1996-02-01

Applicant: ERICSSON TELEFON AB L M

Inventor： HAENDEL PETER ,  SOERQVIST PATRIK

IPC: G10L21/0208 ,  H03H21/00 ,  G10L

Abstract: Noisy speech parameters are enhanced by determining a background noise power spectral density (PSD) estimate, determining noisy speech parameters, determining a noisy speech PSD estimate from the speech parameters, subtracting a background noise PSD estimate from the noisy speech PSD estimate, and estimating enhanced speech parameters from the enhanced speech PSD estimate.

公开(公告)号：DE69937613D1

公开(公告)日：2008-01-03

申请号：DE69937613

申请日：1999-12-07

Applicant: ERICSSON TELEFON AB L M

Inventor： SOERQVIST PATRIK ,  SVENSSON TOMAS ,  SUNDQVIST JIM ,  ERIKSSON ANDERS

IPC: H04M1/60 ,  H04M9/08 ,  H04M1/00

Abstract: Adaptive gain control techniques provide correctly adjusted audio signal levels during the entirety of an Internet telephony conversation and are resilient to background noise and loudspeaker echo. Disclosed techniques can account for multiple near-end speakers, as well as changes in near-end environment. In an exemplary embodiment, an adaptive gain controller includes a gain control processor configured to adjust an analog gain for a microphone output signal based on measurements of the microphone output signal and on measurements of a loudspeaker input signal.

公开(公告)号：SE513672C2

公开(公告)日：2000-10-16

申请号：SE9703143

申请日：1997-09-01

Applicant: ERICSSON TELEFON AB L M

Inventor： GNOSSPELIUS JOHAN ,  SOERQVIST PATRIK

IPC: H04B3/20 ,  H04M7/00 ,  H04M9/08

Abstract: The present invention relates to echo suppression in a telephony system wherein a communication link is established over an analogue network and a digital network. The disclosed echo suppression invention provides cost-effective ways of minimizing an echo arising in the public switched telephone network (PSTN) by calculating a first value for the energy level of the signal from the analogue to the digital network, and likewise calculating a second value for the energy level of the signal from the digital to the analogue network. The sound from the analogue network to digital network is transmitted in dependence of the results of a comparison between the first and second values.

公开(公告)号：SE9703143D0

公开(公告)日：1997-09-01

申请号：SE9703143

申请日：1997-09-01

Applicant: ERICSSON TELEFON AB L M

Inventor： GNOSSPELIUS JOHAN ,  SOERQVIST PATRIK

IPC: H04B3/20 ,  H04M7/00 ,  H04B

Abstract: The present invention relates to echo suppression in a telephony system wherein a communication link is established over an analogue network and a digital network. The disclosed echo suppression invention provides cost-effective ways of minimizing an echo arising in the public switched telephone network (PSTN) by calculating a first value for the energy level of the signal from the analogue to the digital network, and likewise calculating a second value for the energy level of the signal from the digital to the analogue network. The sound from the analogue network to digital network is transmitted in dependence of the results of a comparison between the first and second values.

公开(公告)号：DE69941578D1

公开(公告)日：2009-12-03

申请号：DE69941578

申请日：1999-10-22

Applicant: ERICSSON TELEFON AB L M

Inventor： SOERQVIST PATRIK ,  ERIKSSON ANDERS

IPC: H04B3/23 ,  H04M1/60 ,  H04B3/20 ,  H04B3/21 ,  H04M9/08

Abstract: Frequency domain nonlinear processing techniques are applied in the context of echo suppression. According to exemplary embodiments, the filtering characteristic of a nonlinear processor is dynamically adjusted by comparing the power spectrum of a residual echo component of a communication signal with that of the overall communication signal itself. For example, the filtering characteristic can be adjusted so that the nonlinear processor blocks only those signal frequencies in which the residual echo is, in some sense, dominant. The disclosed techniques make full duplex communication possible during the entirety of a conversation, even while residual echo is being actively suppressed.

公开(公告)号：DE69937613T2

公开(公告)日：2008-10-23

申请号：DE69937613

申请日：1999-12-07

Applicant: ERICSSON TELEFON AB L M

Inventor： SOERQVIST PATRIK ,  SVENSSON TOMAS ,  SUNDQVIST JIM ,  ERIKSSON ANDERS

IPC: H04M1/60 ,  H04M9/08 ,  H04M1/00

Abstract: Adaptive gain control techniques provide correctly adjusted audio signal levels during the entirety of an Internet telephony conversation and are resilient to background noise and loudspeaker echo. Disclosed techniques can account for multiple near-end speakers, as well as changes in near-end environment. In an exemplary embodiment, an adaptive gain controller includes a gain control processor configured to adjust an analog gain for a microphone output signal based on measurements of the microphone output signal and on measurements of a loudspeaker input signal.

公开(公告)号：DE69714431T2

公开(公告)日：2003-02-20

申请号：DE69714431

申请日：1997-01-27

Applicant: ERICSSON TELEFON AB L M

Inventor： HAENDEL PETER ,  SOERQVIST PATRIK

IPC: G10L21/0208 ,  H03H21/00 ,  G10L21/02

Abstract: Noisy speech parameters are enhanced by determining a background noise power spectral density (PSD) estimate, determining noisy speech parameters, determining a noisy speech PSD estimate from the speech parameters, subtracting a background noise PSD estimate from the noisy speech PSD estimate, and estimating enhanced speech parameters from the enhanced speech PSD estimate.

公开(公告)号：DE69714431D1

公开(公告)日：2002-09-05

申请号：DE69714431

申请日：1997-01-27

Applicant: ERICSSON TELEFON AB L M

Inventor： HAENDEL PETER ,  SOERQVIST PATRIK

IPC: G10L21/0208 ,  H03H21/00 ,  G10L21/02

Abstract: Noisy speech parameters are enhanced by determining a background noise power spectral density (PSD) estimate, determining noisy speech parameters, determining a noisy speech PSD estimate from the speech parameters, subtracting a background noise PSD estimate from the noisy speech PSD estimate, and estimating enhanced speech parameters from the enhanced speech PSD estimate.