[Speex-dev] Porting Speex to embedded 32bit

[Vit Kanevsky]

>Dear Speex developers

>I am going to port Speex on LPC2368
>I tested Speex encoding and the mesurments shows ~40ms cpu time for one
>frame

>Do you know who ported speex to NXP or other 32bit platform?

>Best Regards
>Zohar fox
I have an own optimisation for Speex for different versions of ARM architecture.

 


Here is Measurements of performance for STM32 72 MHz. 

 

4000 kbit/sec

Encoder - 59% 

Decoder - 3%

 

6000 kbit/sec

Encoder - 43% 

Decoder - 3.8%

 

8000 kbit/sec

Encoder - 47% 

Decoder - 4%


 

11200 kbit/sec

Encoder - 65% 

Decoder - 4.1%

 

15000 kbit/sec

Encoder - 53% 

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% 

Decoder - 1.11 msec/frame 3.8%

 

8000 kbit/sec  (quality = 3)

Encoder - 15.07 msec/frame 47% 

Decoder - 1.14 msec/frame 4%


 

11200 kbit/sec  (quality = 5)

Encoder -  21 msec/frame 65% 

Decoder - 1.19 msec/frame 4.1%

 

15000 kbit/sec (quality = 7)

Encoder - 16.71 msec/frame 53% 

Decoder - 1.24 msec/frame 4.2%



on LPC2368 - 72 MHz NXP All modes work ( in case of using DMA for collect 160 input samples)

 

Best Regards
Vitaliy Kanevsky

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