Patent ID: 7451319

Claim:
A system for generating a watermarked signal, the system comprising: (1) a processor; (2) a module configured to control the processor to segment a signal into overlapping blocks using a window function; (3) a module configured to control the processor to window each odd-numbered block using the window function; and (4) a module configured, for even-numbered blocks to control the processor to: (a) transform each block into a frequency domain; (b) modulate a phase of each block in the frequency domain by constraining the phase change inside a critical band to prevent an audible envelope change in a time signal; (c) transform each modulated block in a time domain; (d) window each block transformed into the time domain; and (5) a module configured to control the processor to generate a watermarked signal by overlap-adding each odd-numbered block with each even-numbered block.