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Various embodiments associated with signal classification are described. A repeating signal can be partially corrupted and therefore a receiver can obtain an incomplete signal. In one example, the incomplete signal can have discontinuous unobstructed segments. In order for the receiver to understand the contents of the signal, the receiver can identify repeated information in the discontinuous unobstructed segments. This repeated information can be processed to determine content of the signal. In one embodiment, the signal is a dual-tone multi-frequency (DTMF) signal. The receiver can process the content of the DTMF, such as by employing a set of high and low band pass filters, and can identify a high and low frequency of the DTMF. With the high and low frequencies identified, the receiver can access a look-up table and identify a character indicated by the high and low frequency. The receiver can then use or send out the identified character.