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Signal coding method, signal coding apparatus, signal recording medium, and signal transmission method

  • US 6,363,114 B1
  • Filed: 04/16/1998
  • Issued: 03/26/2002
  • Est. Priority Date: 04/30/1997
  • Status: Expired due to Term
First Claim
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1. A signal coding method comprising the steps of:

  • determining a coding difficulty for each unit time of an input signal;

    interrelating an allocation data amount for each unit time with a coding difficulty which has been standardized in advance using an ordinary input signal of the type to which said input signal belongs, so as to obtain a reference value of said allocation data amount interrelated with said coding difficulty of said input signal for said each unit time;

    modifying said reference value of said allocation data amount into an actual allocation data amount; and

    generating coded data by coding said input signal for said each unit time according to said actual allocation data amount;

    wherein said step of modifying said reference value of said allocation data amount into an actual allocation data amount is characterized in that a total B av of allocation bit amount up to a current time is compared to a total B gen of actually generated coding bit amount up to the current time while coding the input signal for each unit time with a constant allocation bit amount b av, and if a value (B av−

    B gen) is positive, it is allowed to assign an allocation bit amount equal to or above b av which is defined as follows;

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