Archived:Full duplex with PCM16 codec produces echo on Nokia N95 with AD-54 headset (Known Issue)
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[[Category:Symbian C++]][[Category:Known Issue]][[Category:S60 3rd Edition FP1]][[Category:Hardware]][[Category:Audio]] | [[Category:Symbian C++]][[Category:Known Issue]][[Category:S60 3rd Edition FP1]][[Category:Hardware]][[Category:Audio]] | ||
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|author= [[User:Technical writer 1]] | |author= [[User:Technical writer 1]] | ||
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|id= KIS001042 | |id= KIS001042 | ||
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==Description== | ==Description== | ||
| − | Simultaneous audio playback and recording (full duplex) may result in echo and/or feedback loop when certain wired headsets are attached and audio is being streamed in uncompressed PCM16 format. | + | {{Abstract|Simultaneous audio playback and recording (full duplex) may result in echo and/or feedback loop when certain wired headsets are attached and audio is being streamed in uncompressed PCM16 format.}} |
==How to reproduce== | ==How to reproduce== | ||
| Line 34: | Line 33: | ||
With the following modifications, also support for PCM16 format can be added: | With the following modifications, also support for PCM16 format can be added: | ||
| − | + | <code cpp> | |
| − | + | // Specify PCM16 fourCC as follows: | |
| − | + | fourCC = TFourCC(' ', 'P', '1', '6'); | |
| − | + | // Sample rate: | |
| − | + | conf.iRate = EMMFSampleRate16000Hz; | |
| − | + | ||
| − | + | ||
| − | + | ||
| + | // Buffer size: | ||
| + | const TUint KBufferLength = 0x2000; | ||
| + | </code> | ||
Running full-duplex audio with this configuration works fine on most devices, but | Running full-duplex audio with this configuration works fine on most devices, but | ||
produces echo on the Nokia N95 when used with the AD-54 headset. | produces echo on the Nokia N95 when used with the AD-54 headset. | ||
Latest revision as of 09:24, 21 June 2012
Archived: This article is archived because it is not considered relevant for third-party developers creating commercial solutions today. If you think this article is still relevant, let us know by adding the template {{ReviewForRemovalFromArchive|user=~~~~|write your reason here}}.
Article Metadata
Tested with
Devices(s): Nokia N95, Nokia N95 8GB
Compatibility
Platform(s): S60 3rd Edition, FP1
Article
Created: User:Technical writer 1
(19 Jun 2008)
Last edited: hamishwillee
(21 Jun 2012)
Description
Simultaneous audio playback and recording (full duplex) may result in echo and/or feedback loop when certain wired headsets are attached and audio is being streamed in uncompressed PCM16 format.
How to reproduce
The example application S60 Platform: Full-Duplex Audio Example supports four codecs: AMR, G.711, G.729, and iLBC.
With the following modifications, also support for PCM16 format can be added:
// Specify PCM16 fourCC as follows:
fourCC = TFourCC(' ', 'P', '1', '6');
// Sample rate:
conf.iRate = EMMFSampleRate16000Hz;
// Buffer size:
const TUint KBufferLength = 0x2000;
Running full-duplex audio with this configuration works fine on most devices, but produces echo on the Nokia N95 when used with the AD-54 headset.
Solution
No solution exists.
