<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</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>