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Method and apparatus for processing coded information received through a telephone line during the inter-ringing periods

  • US 4,383,138 A
  • Filed: 05/15/1980
  • Issued: 05/10/1983
  • Est. Priority Date: 03/31/1980
  • Status: Expired due to Term
First Claim
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1. A method for processing coded information received through a telephone line in a telephone system of the Touch-Tone type in which the system transmits ringing signals separated by inter-ring periods, the method comprising the steps of:

  • (A) normally sending from a calling subscriber signals corresponding to the phone number of a called subscriber;

    (B) when the calling subscriber receives corresponding signals indicating that ringing signals are being sent to the called subscriber in response to the establishment of a ringing circuit between the calling and the called subscribers, sending from the calling subscriber at least one pre-established code signal during at least one of the inter-ringing periods;

    (C) suppressing at the called subscriber the ringing signals received during the ringing periods while letting through the code signal only when said code signal pertains to at least one pre-established code, and thus validating the code signal;

    (D) amplifying said code signals;

    (E) rectifying said amplified code signals;

    (F) deriving from said rectified code signals a triggering signal; and

    (G) in response to said triggering signal, and before the receiver of the phone set of the called subscriber has been unhooked, supplying an indication to the calling subscriber that the pre-established code signal has been received and validated.

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