KR920019147A - Signal transmission method and apparatus of DTMF telephone - Google Patents

Signal transmission method and apparatus of DTMF telephone Download PDF

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Publication number
KR920019147A
KR920019147A KR1019910004016A KR910004016A KR920019147A KR 920019147 A KR920019147 A KR 920019147A KR 1019910004016 A KR1019910004016 A KR 1019910004016A KR 910004016 A KR910004016 A KR 910004016A KR 920019147 A KR920019147 A KR 920019147A
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KR
South Korea
Prior art keywords
signal
input
key
dtmf
keypad
Prior art date
Application number
KR1019910004016A
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Korean (ko)
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KR930012085B1 (en
Inventor
배정환
Original Assignee
문정환
금성일렉트론 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 문정환, 금성일렉트론 주식회사 filed Critical 문정환
Priority to KR1019910004016A priority Critical patent/KR930012085B1/en
Publication of KR920019147A publication Critical patent/KR920019147A/en
Application granted granted Critical
Publication of KR930012085B1 publication Critical patent/KR930012085B1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Telephone Function (AREA)
  • Telephonic Communication Services (AREA)

Abstract

내용 없음No content

Description

DTMF전화기의 신호전송방법 및 장치Signal transmission method and apparatus of DTMF telephone

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제2도는 본 발명에 따른 DTMF전화기의 네트웍 구성도,2 is a network configuration of a DTMF telephone according to the present invention,

제3도는 본 발명에 따른 DTMF디텍션 회로구성도,3 is a schematic diagram of a DTMF detection circuit according to the present invention;

제4도는 본 발명에 따른 DTMF전화기의 키패드의 구성도.4 is a block diagram of a keypad of the DTMF telephone according to the present invention.

Claims (3)

DTMF전화의 신호전송방식에 있어서, DTMF검출신호를 입력받은후 리셋키 신호가 입력되면 LCD표시 출력을 클리어시키고 리셋키 신호가 입력되지 않고 숫자키가 입력되면 숫자키 데이타를 출력하여 LCD표시장치에 표시하고 문자키이면 다음 DTMF검출신호를 입력받은후 그 문자키 데이타를 출력하여 LCD표시장치에 표시하고, 리셋키 입력이 2회 연속들어오면 문자전송을 종료하도록 하는 것을 특징으로 하는 DTMF전화기의 신호 전송 방법.In the signal transmission method of DTMF telephone, when the reset key signal is input after receiving the DTMF detection signal, the LCD display output is cleared. If the reset key signal is not input and the numeric key is input, the numeric key data is output to the LCD display device. If it is displayed and the character key is received, after receiving the next DTMF detection signal, the character key data is outputted and displayed on the LCD display.When the reset key is input twice, the character transmission is terminated. Transmission method. 다이얼용 키패드와 DTMF신호발생장치에 의하여 발생된 키입력혼성신호를 DTMF필터에 입력시켜 "하이" 그룹 신호 구형파와 로우그룹신호 구형파를 발생시키고, 이 신호를 검출기에 인가하여 어떤 키패드의 입력인지를 구별한후 그 결과 신호를 MCU에 인가하여 LCD표시장치에 표시하도록 구성된 것을 특징으로 하는 DTMF전화기의 신호 전송장치.A key input mixed signal generated by the dial keypad and the DTMF signal generator is input to the DTMF filter to generate a "high" group signal square wave and a low group signal square wave, and the signal is applied to the detector to determine which keypad is input. And distinguishing and applying the resultant signal to the MCU and displaying the result on the LCD display device. 제2항에 있어서, 다이얼용 키패드는 일반적인 전화기의 다이얼용 키패드에 문자인지용 키()와 LCD표시장치 리셋용 키()를 추가하여 구성하는 것을 특징으로 하는 DTMF전화기의 신호전송장치.The keypad for dialing according to claim 2, wherein the keypad for dialing is a text recognition key on the keypad for dialing of a general telephone. ) And LCD display reset key ( The signal transmission device of the DTMF telephone, characterized in that by adding a). ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019910004016A 1991-03-13 1991-03-13 Dual tone multiple frequency telephone KR930012085B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019910004016A KR930012085B1 (en) 1991-03-13 1991-03-13 Dual tone multiple frequency telephone

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019910004016A KR930012085B1 (en) 1991-03-13 1991-03-13 Dual tone multiple frequency telephone

Publications (2)

Publication Number Publication Date
KR920019147A true KR920019147A (en) 1992-10-22
KR930012085B1 KR930012085B1 (en) 1993-12-23

Family

ID=19312060

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1019910004016A KR930012085B1 (en) 1991-03-13 1991-03-13 Dual tone multiple frequency telephone

Country Status (1)

Country Link
KR (1) KR930012085B1 (en)

Also Published As

Publication number Publication date
KR930012085B1 (en) 1993-12-23

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