RE: lug-bg: Alsa Sound
- Subject: RE: lug-bg: Alsa Sound
- From: bkrosnov@xxxxxxxx (Boyan Krosnov)
- Date: Wed, 19 Feb 2003 12:00:56 +0200
Sys G.729a bez header compression i bez VAD prez 64kbps full-duplex liniq spokojno minavat 2 call-a
( ako predpolojim che polzvash 20ms (2x10ms) samples vyv vseki paket - 20 bytes
ip - 20; udp - 8; rtp - 12;
primerno vyrhu frame-relay - 8 bytes (kato broish i dvata flaga, a trqbwa da se broi samo ediniq
------------- <-- bakalskata cherta
68 bytes / 20 ms, koeto shte reche 3400 bytes/s -> 27200 bps
)
Sys G.729a i rtp header compression i bez VAD
vmesto da se predavat 40 bytes headeri se predavat na praktika 2 do 5 bytes
(otnovo bakalskata smetka...)
best case:
20+2+8= 30 bytes/20ms -> 1500 bytes/s -> 12000 bps
worst case:
20+5+8= 33 bytes/20ms -> 1650 bytes/s -> 13200 bps
S drugi dumi 4 do 5 call-a s codec G.729a vyrhi sinhronna serijna liniq na 64kbps sys frame-relay i CRTP. Tova bez da se broi VAD-a.
ources:
http://www.erlang.com/bandwidth.html
http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/frame.htm
http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_configuration_guide_chapter09186a00800b75cc.html#22195
(i za tezi koito ne gi e strah ot RFC-ta) http://www.ietf.org/rfc/rfc2508.txt
Ta tvyrdenieto che lipsata na svoboden G.723.1 codec ti prechi da vodish 1 normalen razgovor na 64kbps liniq e meko kazano presileno. :)
BR,
Boyan Krosnov, CCIE#8701
http://boyan.ludost.net/
just another techie speaking for himself
-----Original Message-----
From: Ivaylo Toshev [mailto:ivo@xxxxxxxxxxxxxx]
Sent: Wednesday, February 19, 2003 10:52 AM
To: lug-bg@xxxxxxxxxxxxxxxxxx
Subject: lug-bg: Alsa Sound
á, ÚÄÒÁ×ÅÊÔÅ,
úÎÁÞÉ ÂÁÞËÁÍ ÓÉ ÁÚ ÎÁ RH 8.0 É ÍÉ ÓÅ ÎÁÌÏÖÉ ÄÁ ÐÏÌÚ×ÁÍ Gnomemeeting É ×ÓÉÞËÉ ÄÒÕÇÉ ×ßÚÍÏÖÎÉ H.323 ËÌÉÅÎÔÉ ÚÁ VoIP. ÷ÓÉÞËÏ ÈÕÂÁ×Ï, ÂÁÞËÁÔ, ËÁÔÏ ÓÅ ÉÚËÌÀÞÉ ÒÁÚÂÉÒÁ ÓÅ ÌÉÐÓÁÔÁ ÎÁ Ó×ÏÂÏÄÅÎ ËÏÄÅË G.723.1, ËÏÅÔÏ ÐÒÅÞÉ ÐÏÄ LINUX ÄÁ ÓÅ ×ÏÄÉ ÎÏÒÍÁÌÅÎ ÒÁÚÇÏ×ÏÒ ÐÒÉ ÌÉÎÉÑ 64kbps.
ðÒÏÂÌÅÍÁ, ÏÂÁÞÅ ÍÉ ÂÅÛÅ Ó full-duplex ÒÅÖÉÍÁ ÎÁ sound ËÁÒÔÁÔÁ. úÁ ÔÅÚÉ ËÏÉÔÏ ÓÅ ÂÏÒÑÔ Ó ÐÏÄÏÂÅÎ ÐÒÏÂÌÅÍ, ÝÅ ËÁÖÁ, ÞÅ ÚÁ ËÁÒÔÁ: Cirrus Logic CS 4614/22/24 × RH 8.0 ÓÅ ÐÏÌÚ×ÁÔ ÓÔÁÎÄÁÒÔÎÉÔÅ ÄÒÁÊ×ÅÒÉ ÎÁ ÑÄÒÏÔÏ (ËÁËÔÏ É ÚÁ ×ÓÉÞËÉ ÄÒÕÇÉ Ú×ÕËÏ×É ËÁÒÔÉ ÐÏÄ RH8.0). ó Ä×Å ÄÕÍÉ ÐÒÏÂÌÅÍÁ ÓÅ ÒÅÛÉ ËÁÔÏ ÓÉ ËÏÍÐÉÌÉÒÁÈ ALSA (ÓÁÍÏ, ÞÅ ÔÒÑÂ×Á ÄÁ Å ÐÏÓÌÅÄÎÁÔÁ ÂÅÔÁ ×ÅÒÓÉÑ!) É ÄÕÐÌÅËÓÁ ÓÉ ÔÒßÇÎÁ ËÁÔÏ ÓÌßÎÃÅ.
ïâáþå: óÔÁÎÄÁÒÔÎÁÔÁ ÉÎÓÔÁÌÁÃÉÑ ÎÁ ALSA ÏÔ ÓÏÒÓ ÉÍÁ Ó×ÏÊÓÔ×ÏÔÏ ÄÁ ÐÕÓËÁ ×ÓÉÞËÉ ËÁÎÁÌÉ × MUTE ÒÅÖÉÍ ÐÒÉ ÚÁÒÅÖÄÁÎÅ ÎÁ ÄÒÁÊ×ÅÒÉÔÅ. úÁ ÄÁ ÇÉ "ÏÔÐÕÓÎÁ" ÐÏÌÚ×ÁÍ alsamixer É ×ÓÉÞËÏ Å OK.
å ! éÍÁ ÌÉ ÎÁÞÉÎ ÄÁ ÚÁÐÉÛÁ ÓÔÏÊÎÏÓÔÉÔÅ ÎÁ ÍÉËÓÅÒÁ ÎÑËßÄÅ, ÚÁ ÄÁ ÎÅ ÇÏ ÐÒÁ×Ñ ÐÒÉ ×ÓÅËÉ boot ÎÁ ÍÁÐÉÎÁÔÁ ?
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