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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hello,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I am trying to use speex for speech encoding on my ARM based device. <o:p></o:p></p><p class=MsoNormal>I am facing issues with quality of voice with the narrow band configuration (8k sampling rate).<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>With complexity set to 3 and VBR enabled, I am getting high bitrate output.<o:p></o:p></p><p class=MsoNormal>As an example,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>My input is 8K stereo and I am passing the encoder with 160 samples at a time as per the manual and samples.<o:p></o:p></p><p class=MsoNormal>When there is a speech I get between 40 to 92 bytes of encoded date out of these 160 samples.<o:p></o:p></p><p class=MsoNormal>As I am using very low bandwith wireless network for sending encoded speech data to remote location, this size is not acceptable to me as there is a lot of packet drops on network at this rate.<o:p></o:p></p><p class=MsoNormal>If I change the configuration parameters with max VBR limit at 40000 and complexity set to 10 then I get output upto 30 bytes. But in this case the quality becomes very poor.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Can anybody help me what could be optimum speex setting for 8K stereo to generate lowest bitrate with better voice quality? <o:p></o:p></p><p class=MsoNormal>Any guidance or any help is appreciate.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>regards,<o:p></o:p></p><p class=MsoNormal>Ketan<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>