US5835574 1996年12月16日 1998年11月10日 At&T Corp Dual-tone multi-frequency signal transfer protocolUS5835574 * Dec 16, 1996 Nov 10, 1998 At&T Corp Dual-tone multi-frequency signal transfer protocolUS5835574 * 1996年12月16日 1998年11月10日 At&T Corp Dual-tone multi-frequency signal transfer...
DTMF tones signal to a phone system that a user wants to complete a particular action, sending frequency-based commands to back-end technology. The tones in DTMF technology are “dual-sided” because each key sends two tones, one in high frequency and the other in low frequency. How do Co...
This chapter discusses Dual-Tone Multi-Frequency (DTMF) signaling digital signal processing (DSP) system, which is designed using LabVIEW. DTMF signaling is used extensively in voice communication applications such as voice mail and telephone banking. A DTMF signal is made up of two tones selected...
(d) analyzes the intercepted digits to determine whether a long distance number has been dialed, and (e) if a long distance call has been dialed, transmits onto the subscriber line a DTMF signal which includes the intercepted DTMF signal plus a service provider access code DTMF signal ...
Tone-detection method for a call-progress process which detects at least one\ntone in a multifrequency dual-tone signal in a telecommunication apparatus\nhaving digital signal processing resources. The method involves the step of:- computing (201) the value of the energy of the signal,- ...
The tone duration of DTMF is variable depending on the system used. Standard Whelen timing is 40ms tone, 20ms space, where standard Motorola rate is 250ms tone, 250ms space. Federal Signal ranges from 35ms tone 5ms space to 1000ms tone 1000ms space. Genave Superfast rate is 20ms tone...
When the signal is sent over the telephone line to the telephone company’s switching center, a DTMF decoder separates the signal back into the two frequencies and passes it along to the recipient’s phone. The DTMF decoder is responsible for doing this for all telephone numbers entered by ...
2) Signal Tone board SIG 信号音板3) Dual-Tone Dialing 双音发号4) DTMF 双音频信号 1. This paper introduces the technique of using PSTN as the transfers medium for remote control where the DTMF is used to get the control command. 文章引用公用电话网作为远程控制信号的传输媒体实施远程遥控...
6) Send-digits signal "拨号音信号;""请发码""信号"补充资料:2,2-双氯甲基-三亚甲基-双[双(2-氯乙基)磷酸脂] CAS:38051-10-4分子式:C13H24Cl6O8P2中文名称:2,2-双氯甲基-三亚甲基-双[双(2-氯乙基)磷酸脂]英文名称:2,2- bis(chloromethyl)-trimethylene bis[bis(2-chloroethyl)phosphate] ...
Tone-detection method for a call-progress process which detects at least one tone in a multifrequency dual-tone signal in a telecommunication apparatus having digital signal processing resources. The method involves the step of:- computing (201) the value of the energy of the signal,- processing...