US 12,002,478 B2
Methods and apparatus to perform audio watermarking and watermark detection and extraction
Venugopal Srinivasan, Palm Harbor, FL (US); and Alexander Pavlovich Topchy, New Port Richey, FL (US)
Assigned to The Nielsen Company (US), LLC, New York, NY (US)
Filed by The Nielsen Company (US), LLC, New York, NY (US)
Filed on Jul. 8, 2022, as Appl. No. 17/860,920.
Application 17/860,920 is a continuation of application No. 16/182,321, filed on Nov. 6, 2018, granted, now 11,386,908.
Application 16/182,321 is a continuation of application No. 15/331,168, filed on Oct. 21, 2016, granted, now 10,134,408, issued on Nov. 20, 2018.
Application 15/331,168 is a continuation of application No. 12/464,811, filed on May 12, 2009, granted, now 9,667,365, issued on May 30, 2017.
Claims priority of provisional application 61/174,708, filed on May 1, 2009.
Claims priority of provisional application 61/108,380, filed on Oct. 24, 2008.
Prior Publication US 2022/0351739 A1, Nov. 3, 2022
Int. Cl. G10L 19/018 (2013.01); G10L 19/02 (2013.01); G10L 19/16 (2013.01); G11B 20/10 (2006.01); H04H 20/31 (2008.01); H04H 60/37 (2008.01); H04H 60/58 (2008.01)
CPC G10L 19/018 (2013.01) [G10L 19/0208 (2013.01); G10L 19/173 (2013.01); G11B 20/10 (2013.01); H04H 20/31 (2013.01); H04H 60/37 (2013.01); H04H 60/58 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus to transform media content into a message, the apparatus comprising:
memory;
computer readable instructions; and
one or more processors configured to execute the computer readable instructions to at least:
detect a first symbol, a second symbol, a third symbol, and a fourth symbol sequentially in encoded audio samples;
determine whether the first symbol is a synchronization symbol;
in response to a determination that the first symbol is a synchronization symbol, determine that the first symbol and the third symbol are associated with a first message and the second symbol and the fourth symbol are associated with a second message; and
output at least one of the first message or the second message in response to a determination that a number of audio samples between the first message and the second message corresponds to an encoding repetition rate.