The MT8870 Tone Decoder is a kind of commonly used multi-frequency decode IC product developed by the MITEL company. The pins are suited to standard sockets with a pin pitch of 2.54mm. The Voice Tone Decoder Module in the call can then be interpreted by the module, allowing you to control all manner of projects.
Dialing into the phone from a second mobile and then using the keypad will produce the tones on the original phone. The module shows the state of the signal through onboard LEDs.Īs an idea, you can connect up a mobile phone via 3.5mm to 3.5mm cable to the module. When the module receives the signal it is able to decode it and produce a binary output that can be used in other devices. The tone is a combination of two separate sine waves that produce a unique signal that can be transmitted or heard. This detection module interprets the incoming tone and produces a coded output that can be connected to all manner of microcontrollers.ĭTMF Telephone Audio Speech Decoding Module is commonly found in touch-tone devices such as a phone.
This DTMF Audio/Speech Decoding Telephone Module component is ideally suited to adding dual-tone multi-frequency (DTMF) decoding to your project.
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