This page was last modified 07:00, 19 June 2008.
KIS001042 - Full duplex with PCM16 codec produces echo on Nokia N95 with AD-54 headset
From Forum Nokia Wiki
| ID | KIS001042 | Creation date | June 19, 2008 |
| Platform | S60 3rd Edition, FP1 | Devices | Nokia N95, Nokia N95 8GB |
| Category | Symbian C++ | Subcategory | Audio, Hardware |
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.
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