DTMF Tone Decoder
Dual-Tone Multi-Frequency decoder extracts dialed digits from telephone line audio signals. Designed for telephonic apparatus connection, under HTS 8543.70.60.00.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If general audio processing
Non-telephonic audio falls under microphone amplifiers.
If other signal processing without telephony spec
General decoders classify as other electrical apparatus.
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Import Tips & Compliance
• ITU-T Q.24 DTMF signaling compliance documentation
• FCC emissions testing for line-connected devices
• Emphasize telephony audio decoding function
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