Mobile phone-based audio communication applications

ArticleDirectory

• Introduction to mobile phone headphones
• Why do we use mobile phone audio data communication?
• Compatible with square and happy brush IOS/Android driver Libraries
• Mobile audio to serial port Kit
• Mobile phone Measurement Temperature and Pressure Products
• Mobile phone measuring finger pressure heartbeat Device

1. Communication Technology Between smartphones and peripherals

Currently, smart phones and peripherals communicate more frequently than function machines, such as Bluetooth,WiFi,USB, Infrared, etc. In fact, no matter what platform the mobile phone has a headphone jack, in fact, the data can be quickly transmitted through the headphone jack...

2. Introduction to mobile phone headphones

We know that four cell phone headsets are composed of left-right audio channels, microphones, and locations, as shown in. Of course, some manufacturers will switch the mic and Gnd.

When you want to send data to the device, you need to convert the data into acoustic data and play back the sound. The left and right Audio Channels Output the corresponding voltage waveform based on the volume of the sound data, and the device then converts the waveform into data, you can receive data.

When the device sends data to the mobile phone end, it also forms a bit stream based on the data, which is sent in the form of a square wave or a sine wave. The mobile phone performs recording and analyzes the waveform to obtain the corresponding communication data.

Why do we use mobile phone audio data communication?

We know that the phone ear jack is a standard for mobile phones. No matter what platform brand of mobile phones/tablets/PCS are available, it is possible to create a communication device interface for us, at the same time, we know that the Bluetooth interface has limitations on its cost and other factors. For example, the iPhone/iPad Bluetooth is not public, and only certified chips can communicate with it, in addition, there is a matching process before communication and antennas are also required. The requirements for portable and other mobile devices are not matched. WiFi can also be used as an alternative interface, but it requires a hotspot antenna and so on. It consumes a lot of power and is not easy to move.

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3. Audio Data Communication Products

There are many examples of audio communication applications, such as those in the early U. S.SquareThe payment box is a head that is connected to a headset hole, the mobile phone to decode the electrical signal that the head is sensed when swiping the card, so as to read the card number and track information of the magnetic stripe bank card.

The other is mobile phone and professional communicationIC
Xunxun and xunxunICProcess otherIoControls are used to read signals or sensor signals, or to control other devices, so as to achieve the so-called wearable devices or healthy devices, thus establishing a data channel between the mobile phone end and the device end.

4. My audio data products are compatible with the IOS/Android driver library of square and happy brush.

The following figure shows the data waveform captured during card swiping. The key information such as the track information and card number can be obtained based on the decoded waveform width to complete the payment.

Mobile audio to serial port Kit

Provides interfaces for third parties to quickly implement Mobile-based devices.

Mobile phone Measurement Temperature and Pressure product mobile phone measurement finger pressure heartbeat Device