Down sample Audio 44100Kz to 8000Kz

Question

I have AudioBufferList(also created NSData) with sample rate 44100Kz and wants to down sample it to 8000Kz. So if any one have any idea about down sampling please let me know. Great Idea will be appreciated.

Thanks

basically in iOS do't set static value like Java so need some kind of algorithm and pick some byte in some order with logic so it will downsample — , Jul 03 '12 at 07:58
Do all 12 of your questions really not have acceptable answers? — Almo, Jul 27 '12 at 15:30

score 3 · Accepted Answer · edited May 23 '17 at 10:34

3

You can achieve this using pick the every 6 byte from the byte array you making with your raw data and please try this link

edited May 23 '17 at 10:34

Community

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answered Aug 21 '12 at 10:46

Buntylm

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44.1 KHz / 6 = 7.35 KHz, which is not 8 KHz. – John Wiseman Jun 20 '13 at 23:37

score 0 · Answer 2 · edited May 23 '17 at 11:55

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I'm trying to do the same thing. I have set it to 8000 but im getting a distorted sound. you can see my code in this question to change the sample rate:

my iOS app using audio units with an 8000 hertz sample rate returns a distorted voice

edited May 23 '17 at 11:55

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answered Jul 27 '12 at 15:09

Simon McLoughlin

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Down sample Audio 44100Kz to 8000Kz

2 Answers2