SECONDARY DIALLING METHOD WITHIN ACOUSTIC FREQUENCY BAND

SECONDARY DIALLING METHOD WITHIN ACOUSTIC FREQUENCY BAND

  • CN 1,019,442 B
  • Filed: 10/05/1988
  • Issued: 12/09/1992
  • Est. Priority Date: 10/05/1988
  • Status: Active Grant
First Claim
Patent Images

1. , two-stage dialing system in a kind of voiced band, it comprises that subscribers feeder (20) is connected in series telephone set (1) and pulse dialing method switch (2), duplex radio station (17) is serially connected between 2/4 line converter (15) and the antenna (18), it is characterized in that:

  • described telephone set (1) is the telephone set of pulse, two kinds of dial mode compatibilities of audio frequency;

    Subscribers feeder (19) is serially connected with a subscribers feeder ring detecting circuit I/O mouth A of described switch (2) and single chip microcomputer (8);

    A subscribers feeder automatic take offing machine circuit is serially connected with an I/O mouth B of described switch (2) and described single chip microcomputer (8) through described subscribers feeder (19);

    An I/O mouth C of described single chip microcomputer (8) links to each other with tone generator (16), and the output of tone generator (16) connects 2/4 line converter (15), and converter (15) converts audio frequency four lines of duplexing radio station (17) to the two wires of phone.

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