, they are separated again from vip code and sequentially output to
mixed in key mixer 51 and key vip code generator 50, respectively, based on the output signal from the
selector 47 and the output signal from the vip code splitter 48.
In key mixer 51, a control signal input from the selector 47 is sequentially sent to the mixer 51-0 to
51-(Nxe2x88x921), based on which signals from vip code splitter 48 are sequentially mixed in the
key mixer 51-0 to 51-(Nxe2x88x921) in turn.
The signals from key mixer 51 are sent to key vip code generator 52, which is a combination of the
key vip code generator 50 and the key code vip code generator 53, and generate a vip signal and a
key signal, which are sent to the vip receiver 50 and the key receiver 56, respectively.
VIP code sent from the vip code splitter 48 is sequentially sent to the vip receiver 50, which is a
combination of the vip code detector 50-1 to 50-(Nxe2x88x921) and the vip multiplexer 53, based on
which signals the vip code splitter 48 is determined to be a valid one or invalid one.
The vip signal and the key signal from the key vip code generator 52 are sequentially sent to the
vip multiplexer 53, based on which the valid vip code is converted into valid data, and the invalid
vip code is converted into invalid data, and the same data as that of the valid vip code is sent to the
key receiver 56. The same data as that of the valid key code is sent to the key receiver 56.
The vip receiver 50 processes data received from the vip receiver 52, based on which, the valid
vip code is detected and the invalid vip code is detected, and the same data as that of the valid data
is sent to the multiplexer 45.
The key receiver 56 processes data received from the key receiver 52, based on which, the valid
key code is detected and the invalid key code is detected, and the same data as that of the valid data
is sent to the selector 47.
FIG. 5 is a block diagram showing one example of the key receiver 56.
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