Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2008-04-15
2008-04-15
Deppe, Betsy L. (Department: 2611)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C714S796000
Reexamination Certificate
active
10433509
ABSTRACT:
The present invention establishes a metric calculation method. A constant calculation circuit31calculates constants V/2−A, V/2+A, and A/2, which are required to calculate branch metrics by using an average voltage V/2, corresponding to a parameter R input from an asymmetrical register, which is input from an average voltage register, and output them to adders33, 35, and36, respectively. A multiplier32multiplies an equalized signal ykby a value P of 1 or −1 input from a polarity register. A bit shifter37shifts by c bits A/2−yk, corresponding to the parameter R input from the asymmetrical register, which is input from the adder36. That is, the bit shifter37multiplies A/2−ykby α, and outputs it to adders38and39. However, when the parameter R is 0, the bit shifter37outputs 0 to the adders38and39. The present invention can be applied to a recording and reproduction apparatus.
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