MODULO CANCELACION DE ECO VPMADT032 POR HARDWARE DIGIUM
Este módulo ofrece cancelación de eco de 128 ms (1024 taps) en todos los canales.
Puede ser usado con las tarjetas analógicas de 24 puertos (TDM2400P y AEX2400P), con las tarjetas de 8 puertos (TDM800P y AEX800P) y con las tarjetas de 4 puertos (TDM410P y AEX410P).
Ademas puede ser usado con las tarjetas digitales TE121P y TE122P.
Este cancelador de eco hardware reemplaza al módulo VPM100.
Digium Analog Echo Cancellation Module
Thirty-two (32) Channel Hardware Echo Cancellation Module. Octasic DSP based 128ms per-channel echo cancellation module for use with Digium telephony interface cards. Support for this module requires Switchvox version 5.1 and DAHDI driver version 5.1.
For Asterisk users who connect to the PSTN, the most common type of echo is hybrid echo - the echo introduced by the impedance mismatch between 2-wire and 4-wire telephone circuits. The echo manifests as a distorted and delayed reflection of the users voice while in conversation with an external party through the PSTN. Asterisk itself offers a range of software-based open source echo cancellation routines that are moderately effective in eliminating the hybrid mismatch echo that most Asterisk users experience.
However, there are cases in which these algorithms are not effective. To combat this, Digium introduced DSP-based echo cancellation modules for our multi-port T1/E1/J1 cards and our 24-port analog card. Now, Digium is pleased to make available the VPMOCT032 echo cancellation module. This module, which offers 128ms (1024 taps) of echo cancellation across all of its channels and provides the same toll-quality G.168 compliant echo cancellation found in Digium's HPEC software-based commercial echo canceller. The VPMOCT032 is immune from any system CPU spikes that might otherwise affect a software-based solution.
The VPMOCT032 may be used with Digium's twenty-four port analog card, the TDM2400P, Digium's eight-port analog card, the TDM800P