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arduino - What is the voltage range of a standard ...
https://electronics.stackexchange.com/questions/28404/what-is-the-voltage-range-of-a-standard-headphone-jack-from-a-phone#:~:text=Commercial%20line%20out%20specification%20is%20to%20be%20able,of%201.3%20milliamperes%20RMS%20%283.6%20milliamperes%20peak-to-peak%29.%20Share
iPhone 4 - Technical Specifications
https://support.apple.com/kb/SP587
Video formats supported: H.264 video up to 720p, 30 frames per second, Main Profile level 3.1 with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; MPEG-4 video, up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps per channel, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats; …
iPhone 4 Audio and Frequency Response Limitations – Faber ...
https://blog.faberacoustical.com/wpblog/2010/ios/iphone/iphone-4-audio-and-frequency-response-limitations/
E. Sensitivity: Long & Narrow = -33dB (at 1000Hz 1V/Pa) and Short & Wide = -43dB (at 1000Hz 1V/Pa) (As noted above, iPhone 4 users should select the Long & Narrow Directional position. Mic Sensitivity indicates how efficiently the microphone converts acoustic sound pressure to output voltage which goes into the audio amplifier in the iPhone 4.
iPhone 4 - feed external audio into it fo… - Apple Community
https://discussions.apple.com/thread/2453059
REQUIREMENT & PROBLEM -1 Get a high quality analog or digital audio signal into the iPhone 4 via a MicPortPro & XLR Mic. 1a.The analog audio feeds in to the TRRS 3.5mm jack on the iPhone 4. This can be done now. 1b.The digital audio feeds into the iPhone 4 dock connector. This cannot be done now.
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