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Efficient digital ITU-compliant zero-buffering DTMF...

Telephonic communications – Supervisory or control line signaling – Signal receiver
Reexamination Certificate

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Efficient digital ITU-compliant zero-buffering DTMF...

Telephonic communications – Supervisory or control line signaling – Signal receiver
Reexamination Certificate

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Efficient dynamic energy thresholding in multiple-tone...

Telephonic communications – Supervisory or control line signaling – Signal receiver
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Erasure of DTMF signal transmitted as speech data

Telephonic communications – Supervisory or control line signaling – Signal receiver
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