Displaying 1 result from an estimated 1 matches for "lpc21xx".
Did you mean:
lpc18xx
2009 Jan 05
1
Porting Speex to embedded 32bit
...Decoder - 4.2%
Except 11200 mode it can work on 48 MHz STM32 USB Access Line. (11200 probably can work in non full duplex application).
Version for ARM v5E (STR9) is faster for about of 25% for comparable processor's frequencies, by using of DSP commands.
Version for ARM v4 (STR7, LPC21XX/23XX/28XX) can work even on 60 MHz. (but not all speex modes. Just 6,8,15).
Here is Measurements of performance for LPC2138 - 60 MHz.
4000 kbit/sec (quality = 1)
Encoder - 17.9 msec/frame 59%
Decoder - 0.97 msec/frame 3%
6000 kbit/sec (quality = 2)
Encoder - 13.5 msec/frame 43...