The present invention enables to effectively coding a predetermined time length
of a video signal with a variable bit rate at real time (one-path) into a total
coding bit amount of a constant data capacity.
A coding difficulty calculator 13 determines a coding difficulty of an
input
signal for each unit time. An allocation bit amount calculator 14 interrelates
an allocation sign amount with a coding difficulty for each unit time standardized
in advance using an ordinary input signal of the type to which the input signal
belongs, so as to obtain a reference value of the allocation sign amount for each
unit time interrelated with the coding difficulty supplied from the coding difficulty
calculator 13. This reference value of the allocation sign amount is modified
by a controller 15 into an actual allocation sign amount, according to which
the input signal is coded by a moving picture image coding apparatus 18,
so as to create a coded data.
