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Messages - Riley Casey

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1
SignalScope / iPhone 3Gs with LF roll off on the mic input
« on: August 05, 2009, 03:59:16 PM »
Apparently the new 3Gs phones incorporate a steeper high pass filter on the built in mic and mic input jack input than the previous iPhones.  Are there any plans to issue an update to the Signal Scope app to account for this change in the hardware?

2
The solution as it turns out was to draw a little current from the power supply for the headset mic.  An 3.3k ohm resistor shunting the input drew the 2.7 vdc supply down to 1.9 vdc.  The source oscillator is DC blocked by a 10uF capacitor.  The ipod touch showed " Headset mic " on it's audio source display but initially still failed to display an input signal.  After touching the audio input selector it went to " Headset II " and displayed the output of the bench oscillator.  I am building this set up into an XLR to mini plug adaptor cable to allow me to send signal on to the console inputs and receive signal from the monitor output of a console thru a 50db pad , blocking cap & bias resistor all built into the female xlr of the adaptor cable.

3
SignalScope / Re: Getting signal into iPod Touch via mini jack ?
« on: March 05, 2009, 01:21:35 PM »
I am indeed attempting to get signal into a second generation iPod touch into Signal Scope.  Signal Scope will not accept audio from the mic input ring on the mini jack.  I have also installed an app called Recorder that will recognize a mic input.  What can I do to encourage Signal Scope to play nice with the audio input?

4
SignalScope / Getting signal into iPod Touch via mini jack ?
« on: February 21, 2009, 04:36:20 PM »
I have acquired several TRRS style mine to RCA patch cables which as it turns out are called AV camera cables.  I have identified the appropriate contacts for what should be signal input to the Ipod touch ( Ring 2 and sleeve counting from the tip with Ring 2 being the common for all inputs and outputs ).  Signal Scope shows a " no input display " on the screen.  I can measure signal at the mini plug prior to mating with the Ipod touch.  Is there anything in Signal Suite or the Touch that I need to enable software wise to make Signal Suite look to the mini jack for input ?

I have moved this to a new topic since it the answer may not be the same as the iphone.

5
SignalScope / Re: Getting signals into the iPhone [UPDATED]
« on: February 20, 2009, 12:20:54 PM »
I have acquired several TRRS style mine to RCA patch cables which as it turns out are called AV camera cables.  I have identified the appropriate contacts for what should be signal input to the Ipod touch ( Ring 2 and sleeve counting from the tip with Ring 2 being the common for all inputs and outputs ).  Signal Suite shows a " no input display " on the screen.  I can measure signal at the mini plug prior to mating with the Ipod touch.  Is there anything in Signal Suite or the Touch that I need to enable software wise to make Signal Suite look to the mini jack for input ?

6
SignalSuite / Burst pink noise?
« on: February 13, 2009, 08:37:19 PM »
I don't see an option for burst output in the pink noise generator.  Is it available and if so how would I access that option?

7
SignalSuite / Re: Feature requests
« on: February 13, 2009, 08:33:00 PM »
I would second this request.  I drag a 25 year old Leader signal generator around just to have this indispensable function.  A defineable start and end frequency and a drag to sweep control on screen would be an excellent addition to Signal Suite.

Quote
  with my finger sweep up and down in frequency with more resolution.  So instead of 20-20,000 Hz, be able to sweep from 20-200 Hz along the full width of the frequency slider 

9
SignalScope / Re: Getting signals into the iPhone [UPDATED]
« on: February 11, 2009, 11:58:44 AM »
I have recently acquired an ipod touch 2G with audio input.  I want to get signal into via the mini jack. I've seen TRRS mini to three RCA cables in the wild and thought that Radio Shack at the very least stocked them but apparently not. Does anyone know who stocks these ? It would be a pain to have to just buy the iphone headset and cut that up.

Also while we're on the subject.  Has anyone built a pad for this application and if so do you know what attenuation is required to bring a line level signal down to match the sensitivity of the iPod touchs' input?

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