US 6,982,660 B2
Modulation apparatus and method, and DSV-control-bit generating method
Toshiyuki Nakagawa, Kanagawa (Japan); Minoru Tobita, Tokyo (Japan); and Hiroshige Okamura, Chiba (Japan)
Assigned to Sony Corporation, Tokyo (Japan)
Filed on Apr. 07, 2005, as Appl. No. 11/102,359.
Application 11/102359 is a continuation of application No. 10/471675, previously published as PCT/JP03/00501, filed on Jan. 22, 2003.
Claims priority of application No. P2002-013776 (JP), filed on Jan. 23, 2002.
Prior Publication US 2005/0174265 A1, Aug. 11, 2005
This patent is subject to a terminal disclaimer.
Int. Cl. H03M 5/00 (2006.01); H03M 7/40 (2006.01)
U.S. Cl. 341—58 1 Claim
OG exemplary drawing
 
1. A modulation method of a modulation apparatus for generating a channel-bit sequence from an input bit sequence and generating an output code sequence from the channel-bit sequence, the modulation method comprising:
a digital sum value (DSV) control bit generating step of generating a DSV control bit inserted in the input bit sequence in order to control a DSV of the output code sequence;
a DSV-control-bit inserting step of inserting the DSV control bit generated in the DSV-control-bit generating step at a predetermined position of the input bit sequence;
a modulating step of modulating a post-insertion bit sequence obtained by inserting the DSV control bit into the input bit sequence, into the channel-bit sequence based on a conversion rule of a variable-length code (d, k; m, n; r); and
a synchronization-signal inserting step of inserting a predetermined synchronization signal at a predetermined position of the channel-bit sequence supplied from the modulating step,
wherein the DSV-control-bit generating step comprises:
a modulation-delimiter detecting step of detecting a modulation delimiter that serves as a delimiter for conversion of the variable-length code; and
a valid-delimiter detecting step of detecting a valid delimiter for controlling timing for determining a value of the DSV control bit, based on the modulation delimiter detected in the modulation-delimiter detecting step.