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公开(公告)号：ES2267180T3
公开(公告)日：2007-03-01
申请号：ES98911808
申请日：1998-03-18
Applicant: QUALCOMM INC
Inventor： SIH GILBERT C , GUPTA KUMAR SAMIR
Abstract: Un procedimiento y un aparato para permitir a dos o más usuarios de teléfono sin hilos de bucle local comunicar simultáneamente entre sí y un usuario final lejano en el que están reducidos el eco de auricular y el eco híbrido. La presente invención funciona dentro de un teléfono sin hilos de bucle local que tiene varias entradas de teléfono una de las cuales es un microteléfono dedicado (16) y al menos otra entrada que es un teléfono analógico normalizado (18, 20). Se usan dos canceladores de eco (30, 32) dentro del teléfono para reducir el eco producido por la diferencia de impedancias de un híbrido 4 a 2 hilos (44) y el microteléfono dedicado (16). Un primer cancelador de eco (30) se optimiza para eliminar el eco del auricular generado en el microteléfono dedicado (16) mientras que un segundo cancelador de eco (32) se optimiza para eliminar el eco híbrido generado en el híbrido 4a 2 hilos (44). Los dos canceladores de eco funcionan independientemente de forma que ningún cancelador de eco necesita adaptar sus coeficientes de filtro cuando se produce un cambio en las características de canal de eco, tal como cuando un interlocutor cuelga u otro interlocutor se une a la conversación.
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公开(公告)号：AT334513T
公开(公告)日：2006-08-15
申请号：AT98911808
申请日：1998-03-18
Applicant: QUALCOMM INC
Inventor： SIH GILBERT C , GUPTA KUMAR SAMIR
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.
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公开(公告)号：FI19991937A
公开(公告)日：1999-11-19
申请号：FI19991937
申请日：1999-09-10
Applicant: QUALCOMM INC
Inventor： SIH C GILBERT , GUPTA KUMAR SAMIR
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.
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