DTMF Frequencies Decoder
DTMF Frequencies Encoder
Answers to Questions
What are DTMF Codes? (Definition)
A DTMF code for dual-tone multi-frequency, is the name given to a combination of sound frequencies (beep) emitted by the keys of a telephone keypad. They are used by voice servers and for dialing numbers.
How to encrypt a number using DTMF Codes?
DTMF codes are used by phones and can be used to substitute numbers with their sound wave frequency as described in the table:
|1209 Hz||1336 Hz||1477 Hz||1633 Hz|
Example: To crypt DC0D3, look for D which is the combination of 941Hz and 1633Hz, then write it 1633-941 (or 941-1633). The complete ciphered message is 1633-941/1633-852/1336-941/1633-941/1477-697
How to decrypt Codes DTMF cipher?
Decryption is a simple reverse substitution, for each frequency, a digit or a letter is associated.
How to recognize DTMF Codes?
There are only 8 frequencies: 697 Hz, 770 Hz, 852 Hz, 941 Hz, 1209 Hz, 1336 Hz, 1477 Hz and 1633 Hz.
What does DTMF means?
DTMF stands for dual-tone multi-frequency and translates sometimes into Vocal Frequencies.