<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style> </head> <body dir="ltr"> <div style="font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);"> <div><font size="3" face="Calibri,Helvetica,sans-serif" color="black"><span style="font-size:12pt;">Yes Paul, your understanding is right. <br> </span></font></div> <div><font size="3" face="Calibri,Helvetica,sans-serif" color="black"><span style="font-size:12pt;"><br> </span></font></div> <div><font size="3" face="Calibri,Helvetica,sans-serif" color="black"><span style="font-size:12pt;">Rubber band audio is meant for this I guess</span></font></div> <div><font size="3" face="Calibri,Helvetica,sans-serif" color="black"><span style="font-size:12pt;">(<b>Rubber Band Library</b> is a high quality software library for audio time-stretching and pitch-shifting. )</span></font></div> <div><font size="3" face="Calibri,Helvetica,sans-serif" color="black"><span style="font-size:12pt;"><br> </span></font></div> <div><font size="3" face="Calibri,Helvetica,sans-serif" color="black"><span style="font-size:12pt;">-ben</span></font></div> <br> </div> <hr style="display:inline-block;width:98%" tabindex="-1"> <div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Paul Davis <paul@linuxaudiosystems.com><br> <b>Sent:</b> Sunday, June 17, 2018 4:38 PM<br> <b>To:</b> Benny Alexandar<br> <b>Cc:</b> Ralf Mardorf; linux-audio-user@lists.linuxaudio.org<br> <b>Subject:</b> Re: [LAU] Audio seamless switch</font> <div> </div> </div> <meta content="text/html; charset=utf-8"> <div> <div dir="ltr"> <div class="x_gmail_default" style="font-family:arial,helvetica,sans-serif">So you want to stretch/shrink the newly-switched-to audio so that it "catches up" with the just-switched-from audio and then runs at normal speed?<br> <br> </div> <div class="x_gmail_default" style="font-family:arial,helvetica,sans-serif">This strikes me as madness, but hey, good luck!<br> </div> <br> </div> <div class="x_gmail_extra"><br> <div class="x_gmail_quote">On Sun, Jun 17, 2018 at 4:16 AM, Benny Alexandar <span dir="ltr"> <<a href="mailto:ben.alex@outlook.com" target="_blank">ben.alex@outlook.com</a>></span> wrote:<br> <blockquote class="x_gmail_quote" style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex"> <div dir="ltr"> <div style="font-family:Calibri,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> <span class=""> <div><font face="Calibri,Helvetica,sans-serif" size="3" color="black"><span style="font-size:12pt">>>><font face="arial,Helvetica,sans-serif" size="2"><span style="font-size:11pt">why would you need to resample/stretch them?</span></font><font face="arial,Helvetica,sans-serif" size="2"><span style="font-size:11pt"><br> </span></font> <font face="arial,Helvetica,sans-serif"></font></span></font></div> </span> <div><font face="Calibri,Helvetica,sans-serif" size="3" color="black"><span style="font-size:12pt"><font face="arial,Helvetica,sans-serif">As mentioned earlier the two audio are identical but one will be ahead/delayed than other. </font><font face="arial,Helvetica,sans-serif"><br> </font></span></font></div> <div><font face="Calibri,Helvetica,sans-serif" size="3" color="black"><span style="font-size:12pt"><font face="arial,Helvetica,sans-serif">The user who is listening to it should not notice the switching, and this </font><font face="arial,Helvetica,sans-serif"><br> </font></span></font></div> <div><font face="Calibri,Helvetica,sans-serif" size="3" color="black"><span style="font-size:12pt"><font face="arial,Helvetica,sans-serif">switching happens when the quality of one audio is degraded compared to other. </font><font face="arial,Helvetica,sans-serif"><br> </font></span></font></div> <div><font face="Calibri,Helvetica,sans-serif" size="3" color="black"><span style="font-size:12pt"><font face="arial,Helvetica,sans-serif"><br> </font></span></font></div> <div><font face="Calibri,Helvetica,sans-serif" size="3" color="black"><span style="font-size:12pt"><font face="arial,Helvetica,sans-serif">-ben</font></span></font></div> <br> </div> <hr style="display:inline-block; width:98%"> <div id="x_m_5592987197815866829divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Paul Davis <<a href="mailto:paul@linuxaudiosystems.com" target="_blank">paul@linuxaudiosystems.com</a>><br> <b>Sent:</b> Sunday, June 17, 2018 12:01 AM<br> <b>To:</b> Benny Alexandar<br> <b>Cc:</b> Ralf Mardorf; <a href="mailto:linux-audio-user@lists.linuxaudio.org" target="_blank"> linux-audio-user@lists.<wbr>linuxaudio.org</a><span class=""><br> <b>Subject:</b> Re: [LAU] Audio seamless switch</span></font> <div> </div> </div> <div> <div dir="ltr"> <div class="x_m_5592987197815866829x_gmail_default" style="font-family:arial,helvetica,sans-serif"> <br> </div> <div> <div class="x_h5"> <div class="x_m_5592987197815866829x_gmail_extra"><br> <div class="x_m_5592987197815866829x_gmail_quote">On Sat, Jun 16, 2018 at 2:13 PM, Benny Alexandar <span dir="ltr"><<a href="mailto:ben.alex@outlook.com" target="_blank">ben.alex@outlook.com</a>></span> wrote:<br> <blockquote class="x_m_5592987197815866829x_gmail_quote" style="margin:0px 0px 0px 0.8ex; border-left:1px solid rgb(204,204,204); padding-left:1ex"> <div dir="ltr"> <div style="font-family:Calibri,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> >> <font size="2"><span style="font-size:11pt">What is the reason that signal<br> 1 is ahead of signal 2? </span></font></div> <div style="font-family:Calibri,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> <br> </div> <div style="font-family:Calibri,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> For various reason, one audio receiving from network and <br> </div> <div style="font-family:Calibri,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> other thru air. <br> </div> <div style="font-family:Calibri,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> <br> </div> <div style="font-family:Calibri,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> >> <font size="2"><span style="font-size:11pt">Perhaps a simple delay is what you are looking for, but maybe you need<br> resampling.</span></font></div> <div style="font-family:Calibri,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> <br> </div> <div style="font-family:Calibri,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> Yes delay estimation is required as the delay is not known upfront. <br> </div> <div style="font-family:Calibri,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)"> In addition to re-sampling stretching also required. <br> </div> </div> </blockquote> <div><br> <div class="x_m_5592987197815866829x_gmail_default" style="font-family:arial,helvetica,sans-serif"> that turns it into a totally different problem. You originally said: <br> <br> <font size="2"><span style="font-size:11pt"><span class="x_m_5592987197815866829x_gmail-">two identical audio inputs say A1 & A2.<br> <br> </span></span></font></div> <div class="x_m_5592987197815866829x_gmail_default" style="font-family:arial,helvetica,sans-serif"> <font size="2"><span style="font-size:11pt"><span class="x_m_5592987197815866829x_gmail-">why would you need to resample/stretch them?<br> </span></span></font></div> <div class="x_m_5592987197815866829x_gmail_default" style="font-family:arial,helvetica,sans-serif; display:inline"> <br> </div> </div> </div> </div> </div> </div> </div> </div> </div> </blockquote> </div> <br> </div> </div> </body> </html>