[Speex-dev] what is "Mode"?

messaging bay support at messagingbay.com
Mon Apr 12 19:32:36 PDT 2010


Hi 

What is the "Mode"? Should I set it in program for setting the bit rate and quality? Or I only need to set the quality?

At the bottom of the following page: 

http://www.speex.org/docs/manual/speex-manual/node10.html

In Table 4: Quality versus bit-rate:

Mode	Quality	Bit-rate (bps)	mflops	Quality/description
0	-	250	0	No transmission (DTX)
1	0	2,150	6	Vocoder (mostly for comfort noise)
2	2	5,950	9	Very noticeable artifacts/noise, good intelligibility
3	3-4	8,000	10	Artifacts/noise sometimes noticeable
4	5-6	11,000	14	Artifacts usually noticeable only with headphones
5	7-8	15,000	11	Need good headphones to tell the difference
6	9	18,200	17.5	Hard to tell the difference even with good headphones
7	10	24,600	14.5	Completely transparent for voice, good quality music
8	1	3,950	10.5	Very noticeable artifacts/noise, good intelligibility
9	-	-	-	reserved
10	-	-	-	reserved
11	-	-	-	reserved
12	-	-	-	reserved
13	-	-	-	Application-defined, interpreted by callback or skipped
14	-	-	-	Speex in-band signaling
15	-	-	-	Terminator code



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