DTMF (Dual Tone Multi-Frequency) decoders are devices that receive data transmissions in amateur radio frequency bands. They constantly monitor incoming signals for valid DTMF digits. These electronic circuits decode DTMF dial tones from telephone lines into touch-tone phones via a process known as tone dialing.
The basic DTMF decoder identifies tones from a normal touch-tone phone. It then activates an LED to provide a 4-bit binary signal as an output code.
DTMF decoders are tolerant of level variations, but function optimally at a 0dB range.
What are DTMF decoders used for?
DTMF decoders increase connectivity in electronics to allow better control of applications. Home applications like alarm systems, electronic gates and garage doors, intercom systems and everyday appliances make use of DTMF functionalities.
Public switched telephone networks (PSTN) and voice response systems are other examples where DTMF application is necessary.
Types of DTMF decoders
The most common types of DTMF Decoders include 2-tone, 5-tone, multi-tone and burst-tone versions. Multi-tone decoders receive and translate multiple tones from the source, and burst-tone versions decode clashing frequencies into binary signals
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A range of single and multi-output LED driver
ICs from Texas Instruments suitable for a variety of applications including backlighting, display panels and LED signage.
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Standard logic ICs using CMOS technology to achieve
operating speeds similar to LSTTL with the low power consumption of CMOS integrated circuits. The 74HC4000 logic family is functionally and pin-compatible with the standard LS logic family, and all devices have ...
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Variable-Gain or Voltage-Controlled Amplifiers are electronic differential amplifiers
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