He's is an experience to share... and all this I know already but when you experience just how frugal codec2 is on speech bits, it is enlightenment.....
I am doing a project that uses Codec2 and sends data over Si4460 transceiver chips. one thing that has become apparent is there is not much data coming out... I send a packet every 20mS so that lost packets don't matter so much. But.. all there is to transmit is ... 8 bytes ! :-) there is 12 bytes wrapped around it..... Ha ! which means the data rate (and BW) has to go up to cope with the overhead..... and David has worked so hard to get the bits down, and I just throw 1.5x excess in radio overhead... So I went up to 3 frames 60mS (24 bytes) plus the 12 byte overhead per transmission....A bit better... A lost packet hurts more, but the operating bandwidth is less. With the diversity operation (I use TWO of the Si4460 chips simultaneously with two antennas) , overall the reduction in BW has reduced packet loss. In the single antenna no diversity option, it is better to have short packets and a higher threshold (due to higher bit rate) It's just I am used to 64kbps... not 3.2kbps. g ------------------------------------------------------------------------------ _______________________________________________ Freetel-codec2 mailing list Freetel-codec2@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freetel-codec2
