Hi Santosh, since we are talking about speex I think we can do it on the mailing list. Other users might participate and get/provide useful information. If you want to talk about not-speex-related matters you can use this email address anyway. Regards, llandre PS: I think your mail client does not work perfectly. When you replied to my first message, it changed the subject from "Encoder performance on ARM9" to "Re:Problems with 16kHz encoding". DAVE Electronics System House - R&D Department web: http://www.dave-tech.it email: r&d2@dave-tech.it