iphone - Bandwidth from headphone/microphone jack -


To check credit card data, I saw Square after using the headphone jack on the iPhone.

What is the average bandwidth of the headphone jack on the iPhone, average notebook and average mobile device?

Can it be doubled by sending different data streams on different channels?

An issue is the bandwidth of audio cables, which I will not go to here. For audio ports, the maximum bandwidth of 22.05 or 24 kHz (with a maximum sampling rate of 44,100 or 48,000 samples / s on 16 beats / specimen / channel, as a result of which originally resulted, for the sound sampling, sampling signal to this theorem Continuous-dimension to apply) and transfer rate of 176.4 or 192 kbps for stereo. According to

, line-in supports a maximum sample on the iPhone, the mic also runs at 48 kHz at a rate of 48 kHz, while the specimen of a 1 gene iPhone mic is at 8 kHz. is. I could not find a bit of a bit of iPhone for the iPhone, but I believe it uses a 16 bit sample. There is another possibility of 24-bit samples.

Quoting an Apple Audio Developer Note, with a 96-kHz sample rate of 24 bit samples in line-in on a MacBook support, the data rate of 576 Kbps is maximized in the apple page Sampling rate is 192kHz, but they may have switched to the maximum sample rate for digital audio using optical port.

For one, the sample rate of 8 kHz in the phone system was 8 beats / sample mono, resulting in a maximum of 8 kbps data rate. Sample rate at FM is 22 bits / specimen / channel of 22.05 kHz and is stereo, resulting in a data rate of 88.2 kbps.

Of course, the above calculation ignores the problem of synchronizing the data stream and error detection and correction, which will consume a portion of all signals.


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