Openmoko Bug #1267: Strong echo when calling a Neo from another phone
Openmoko Public Trac
bugs at docs.openmoko.org
Sat Jul 12 09:52:44 CEST 2008
#1267: Strong echo when calling a Neo from another phone
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Reporter: mail at mmontour.net | Owner: sean_chiang at openmoko.org
Type: defect | Status: assigned
Priority: high | Milestone:
Component: Audio | Version: unspecified
Severity: normal | Resolution:
Keywords: audio, echo | Blocking:
Blockedby: |
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Comment(by danielmewes):
I am using the Neo1973 with ASU and modified the
/ust/share/openmoko/scenarios/gsmhandset.state to the attached state file
and was able to strongly reduce (however not totally eliminate) the echo
and also generally increasing the sound quality.
I do not remember what exactly I changed, but a diff should reveal this.
As far as I remember regarding the echo I especially had to change:
1. Mono 2 Mux from Inverted Mono 1 to Right
2. Mono Sidetone Playback Volume to 0 (interestningly, there is still some
sidetone on the Neo. Perhaps both the modem and the sound card generate
one??)
But I am not sure if those changes are sufficient or I changed another
important thing (just went through the mixer while a call was on and tried
to change nearly every control). Please look into the attached file, if
this alone should not help.
This however is more a dirty-but-working-hack, since I did not look into
how the sound is actually wired inside the Neo and what exactly all the
controls are meaning.
--
Ticket URL: <https://docs.openmoko.org/trac/ticket/1267#comment:5>
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