Memory management methods and apparatus for digital telephone answering devices

  • US 5,163,082 A
  • Filed: 10/04/1990
  • Issued: 11/10/1992
  • Est. Priority Date: 10/04/1990
  • Status: Expired due to Term
First Claim
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1. A method for retrieving unused memory space in digital memory from any location in said digital memory used by a digital telephone answering device (DTAD) for storing incoming and outgoing messages, the steps comprising:

  • generation by a controller of said DTAD of a table comprised of entries representing said incoming and outgoing messages stored in said digital memory, each of said entries being the location of an incoming or outgoing message in said digital memory used for storing incoming and outgoing messages and a flag;

    setting said flag of certain entries of said table so that said certain messages represented by said flagged entries may be deleted from said digital memory;

    deletion of all incoming and outgoing messages in said digital memory that have had their said entries in said table so flagged for deletion;

    moving of remaining saved incoming and outgoing messages into the memory previously occupied by said deleted messages; and

    regeneration by said controller of said table containing entries, said entries being the new locations and flags of said saved messages in said digital memory.

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