Faber Acoustical Forum

Faber Acoustical iOS Apps => SignalScope Pro => Topic started by: Jason on August 21, 2009, 02:15:27 AM

Title: Horizontal Axis
Post by: Jason on August 21, 2009, 02:15:27 AM
Hi.,

My iPhone is 2G OS 3.01.
Run SSP FFT Analyzer , This Horizontal Axis at 0.0KHz~4.0KHz Only, Why ever?

How do seting to 0~20KHz axis.

Thanks,

Jason
Title: Re: Horizontal Axis
Post by: FaberAST on August 24, 2009, 09:22:52 AM
Hello Jason,

If you use the built-in microphone on the 2G iPhone, the sample rate is limited to 8 kHz, which is why you can only analyze signals up to 4 kHz. If you use a headset microphone, or a dock connector input, the sample rate will be 48 kHz, so you can analyze signals up to 24 kHz.

You might want to read some of the related articles on the blog, starting with the entry about iPhone OS Audio Routes (http://blog.faberacoustical.com/2009/iphone/iphone-os-audio-routes/).

Ben
Title: Re: Horizontal Axis
Post by: Jason on August 26, 2009, 07:33:41 AM
Hi.. Ben

Thanks for the help.   :lol:


Jason