A DTMF TONE DETECTION ALGORITHM WITH LOW COMPUTATION COMPLEXITY
Original Publication Date: 1994-Jun-01
Included in the Prior Art Database: 2002-Mar-05
DTMF tone detection is an essential technique in telephone applications, such as voice mail, auto- matic answering service. To perform DTMF tone detection in real-time, it usually requires dedicated hardware to support, e.g., digital signal processor. The invented algorithm employs only addition and subtraction arithmetic operations, so that it can be implemented in real-time by ordinary micro processor.