LED 8 Digit Display Receiver (128digit memory)

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 ¡Ø DTMF 16key LED 8-Digit (128digit memory) Decorder  Ç¥½Ã ¿¹

 

      
       0   1  2  3  4  5   6   7   8   9   *  #  A   B   C   D

DTMF ¼ýÀÚ "1"ÀÇ ÆÄÇü

Waveform for a pure 697 Hz Tone

+

=

697 Hz Tone + 1209 Hz Tone = DTMF Tone "1"


DTMF "Touch" Tones are defined in CCITT Volume VI:
General Recommendations on Telephone Switching and Signalling Recommendation Q.23: Technical Features of Push-Button Telephone Sets.". This document and its related standard documents will tell you more than you would ever want to know about DTMF tones.

 

 

1209Hz

1336Hz

1477Hz

1633Hz

 

697Hz


1

ABC
2

DEF
3


A

697Hz

770Hz

GHI
4

JKL
5

MNO
6


B

770Hz

852Hz

PQRS
7

TUV
8

WXYZ
9


C

852Hz

941Hz


*

oper
0


#


D

941Hz

 

1209Hz

1336Hz

1477Hz

1633Hz

 

 

  ¼ö½Å(µðÄÚ´õ)ÇÏ´Â Ãø¿¡¼­´Â ¸ÕÀú ³·Àº ÁÖÆļö¿Í ³ôÀº

  ÁÖÆļö·Î ºÐ¸®ÇÑ ´ÙÀ½ Äڵ带 ±¸ºÐ ÇÏ°Ô µÈ´Ù

 

   ¼¼·Î´Â ³ôÀº ÁÖÆļö ±º

   °¡·Î´Â ³·Àº ÁÖÆļö ±º


 

±âÈ£

ÁÖÆļö

±âÈ£

ÁÖÆļö

*

941 & 1209 Hz

6

770 & 1477 Hz

#

941 & 1477 Hz

7

852 & 1209 Hz

0

941 & 1336 Hz

8

852 & 1336 Hz

1

697 & 1209 Hz

9

852 & 1477 Hz

2

697 & 1336 Hz

A

697 & 1633 Hz

3

697 & 1477 Hz

B

770 & 1633 Hz

4

770 & 1209 Hz

C

852 & 1633 Hz

5

770 & 1306 Hz

D

941 & 1633 Hz