(Difference between revisions)

Archived:Full duplex with PCM16 codec produces echo on Nokia N95 with AD-54 headset (Known Issue)

From Nokia Developer Wiki
Jump to: navigation, search
Forum Nokia KB (Talk | contribs)
m (1 revision(s))
Forum Nokia KB (Talk | contribs)

Revision as of 09:59, 19 June 2008


ID KIS001042 Creation date June 19, 2008
Platform S60 3rd Edition, FP1 Devices Nokia N95, Nokia N95 8GB
Category Symbian C++ Subcategory Audio, Hardware


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.


No solution exists.

66 page views in the last 30 days.

Was this page helpful?

Your feedback about this content is important. Let us know what you think.


Thank you!

We appreciate your feedback.