DTMF detection and signal generation circuit

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Specializing in the production of LED chip LED LED lamp beads

SLIC, DTMF detection and tone generation circuit: composed of STL3055 chip.
In the software industry, especially when it comes to Microsoft's operating system activation technology, the SLIC is called the Software Licensing Internal Code.
Dual Tone Multi Frequency, dual tone multi-frequency, consists of high frequency group and low frequency group. The high and low frequency groups each contain 4 frequencies. A high frequency signal and a low frequency signal are superimposed to form a combined signal representing a number. The DTMF signal has 16 codes. The DTMF signaling can be used to select the corresponding intercom dual tone multi-frequency signal (DTMF), a kind of user signaling between the telephone and the switch in the telephone system, which is usually used to send the called number. Before using a dual tone multi-frequency signal, a series of intermittent pulses are used in the telephone system to transmit the called number, called pulse dialing. Pulse dialing requires operators in the telecommunications bureau to manually complete long-distance connections (early methods, very old and very antique).