Changes between Version 2 and Version 3 of Tone_Generator

Timestamp:

Sep 18, 2008 1:21:15 PM (16 years ago)

Author:

bennylp

Comment:

--

Tone_Generator

@@ -8 +8 @@
  - {{{PJMEDIA_TONEGEN_SINE}}}: The good-old generation using math's sine(), floating point. This has very good precision but it's the slowest and requires floating point support and linking with the math library.
  - {{{PJMEDIA_TONEGEN_FLOATING_POINT}}}: Floating point approximation of sine(). This has relatively good precision and much faster than plain sine(), but it requires floating-point support and linking with the math library.
- - {{{PJMEDIA_TONEGEN_FIXED_POINT_CORDIC}}} (new in 1.0-rc3): Fixed point using sine signal generated by Cordic algorithm. This algorithm can be tuned to provide balance between precision and performance by tuning the {{{PJMEDIA_TONEGEN_FIXED_POINT_CORDIC_LOOP}}} setting, and may be suitable for platforms that lack floating-point support.
+ - {{{PJMEDIA_TONEGEN_FIXED_POINT_CORDIC}}} (new in 1.0-rc3): Fixed point using sine signal generated by Cordic algorithm. This algorithm can be tuned to provide balance between precision and performance by tuning the {{{PJMEDIA_TONEGEN_FIXED_POINT_CORDIC_LOOP}}} setting, and may be suitable for platforms that lack floating-point support. The default setting for {{{PJMEDIA_TONEGEN_FIXED_POINT_CORDIC_LOOP}}} is 8.
  - {{{PJMEDIA_TONEGEN_FAST_FIXED_POINT}}}: Fast fixed point using some approximation to generate sine waves. The tone generated by this algorithm is not very precise, however the algorithm is very fast.
 
@@ -31 +31 @@
 
 || PJMEDIA_TONEGEN_SINE:[[BR]] [[Image(sine.JPG)]] || PJMEDIA_TONEGEN_FLOATING_POINT:[[BR]] [[Image(float.JPG)]] ||
-|| PJMEDIA_TONEGEN_FIXED_POINT_CORDIC with 10 iterations:[[BR]] [[Image(cordic10.JPG)]] || PJMEDIA_TONEGEN_FIXED_POINT_CORDIC with 8 iterations:[[BR]][[Image(cordic8.JPG)]] ||
+|| PJMEDIA_TONEGEN_FIXED_POINT_CORDIC with 10 iterations:[[BR]] [[Image(cordic10.JPG)]] || PJMEDIA_TONEGEN_FIXED_POINT_CORDIC with 8 iterations (default):[[BR]][[Image(cordic8.JPG)]] ||
 || PJMEDIA_TONEGEN_FIXED_POINT_CORDIC with 7 iterations:[[BR]] [[Image(cordic7.JPG)]] || PJMEDIA_TONEGEN_FAST_FIXED_POINT: [[BR]][[Image(fast-fixed-point.JPG)]] ||
 
 
+== Performance ==
+
+Below is the time measurements of the algorithms. The test measures the generation of 1 second worth of dual-tone at 8KHz sampling rate. For single-tone, just divide the results by two, and for 16KHz dual-tone, just multiply the results by two.
+
+The MIPS value uses the same convention as in [PJMEDIA-MIPS PJMEDIA Performance Measurement] page.
+
+=== Linux, ARM9 (ARM926EJ-S), gcc ===
+
+On this platform we use {{{-O3 -msoft-float -DNDEBUG -DPJ_HAS_FLOATING_POINT=0}}} flags.
+
+||                || time (usec) || CPU (%) || MIPS ||
+|| PJMEDIA_TONEGEN_SINE           || 506,535 || 50.653 || 100.29 ||
+|| PJMEDIA_TONEGEN_FLOATING_POINT ||  18,037 || 1.804 || 3.57 ||
+|| PJMEDIA_TONEGEN_FIXED_POINT_CORDIC with 10 iterations || 11,662 || 1.166 || 2.31 ||
+|| PJMEDIA_TONEGEN_FIXED_POINT_CORDIC with 8 iterations (default) || 9,872 || 0.987 || 1.95 ||
+|| PJMEDIA_TONEGEN_FIXED_POINT_CORDIC with 7 iterations || 8,943 || 0.894 || 1.77 ||
+|| PJMEDIA_TONEGEN_FAST_FIXED_POINT || 1,449 || 0.145 || 0.29 ||
+