DTMFの用途 遠隔操作 自動送出
実験中の回路基板
DTMFの用途 実験中の回路基板
Storage record number(保管記録番号)Dual-tone multi-frequency signaling (DTMF) is an in-band telecommunication signaling system using the voice-frequency band over telephone lines between telephone equipment and other communications devices and switching centers. DTMF was first developed in the Bell System in the United States, and became known under the trademark Touch-Tone for use in push-button telephones supplied to telephone customers, starting in 1963.[1] DTMF is standardized by ITU-T Recommendation Q.23. It is also known in the UK as MF4.
