Invention Grant
US08681824B2 DTMF tone monitoring apparatus and method of identifying a DTMF tone
有权
DTMF音调监视装置和识别DTMF音的方法
- Patent Title: DTMF tone monitoring apparatus and method of identifying a DTMF tone
- Patent Title (中): DTMF音调监视装置和识别DTMF音的方法
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Application No.: US12918185Application Date: 2008-03-14
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Publication No.: US08681824B2Publication Date: 2014-03-25
- Inventor: Dragos Ion
- Applicant: Dragos Ion
- Applicant Address: US TX Austin
- Assignee: Freeascale Semiconductor, Inc.
- Current Assignee: Freeascale Semiconductor, Inc.
- Current Assignee Address: US TX Austin
- International Application: PCT/IB2008/050965 WO 20080314
- International Announcement: WO2009/112891 WO 20090917
- Main IPC: H04J3/12
- IPC: H04J3/12 ; H04B7/216
Abstract:
A tone monitoring apparatus comprises a tone detector arranged to detect, when in use, a tone having a first duration equal to or greater than a predetermined duration. The tone detector is further arranged to select, when in use, a first signal path between a channel input and a channel output, the selection being in response to the first duration of the tone being equal to or greater than the predetermined duration.
Public/Granted literature
- US20100329367A1 DTMF TONE MONITORING APPARATUS AND METHOD OF IDENTIFYING A DTMF TONE Public/Granted day:2010-12-30
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