Provided is a terminal apparatus including a target data acquisition unit configured to acquire target data which is: superimposed data obtained by superimposing spread encoded data on non-spread encoded audio data, the spread encoded data obtained by encoding information using a spreading code; or data obtained by converting sound reproduced on the basis of the superimposed data into an electrical signal; and an information extraction unit configured to retain multiple spreading codes and extract the information from the target data using a spreading code selected by a user.

Example methods, apparatus and articles of manufacture to provide media content are disclosed. A disclosed example method includes receiving an audio signal output by a first media presentation device, the audio signal being associated with first media content, decoding the audio signal to extract a code from the audio signal, the code identifying at least one of the first media content or a broadcaster of the first media content, setting a clock using a timestamp associated with the code, obtaining second media content based on the code and the timestamp, the second media content comprising a plurality of pieces of secondary content for respective ones of a plurality of timestamps, and presenting, at a second media presentation device, a first of the plurality of pieces of secondary media when its respective timestamp substantially corresponds to a time value obtained from the clock.

Example methods, apparatus and articles of manufacture to provide media content are disclosed. A disclosed example method includes receiving an audio signal output by a first media presentation device, the audio signal being associated with first media content, decoding the audio signal to extract a code from the audio signal, the code identifying at least one of the first media content or a broadcaster of the first media content, setting a clock using a timestamp associated with the code, obtaining second media content based on the code and the timestamp, the second media content comprising a plurality of pieces of secondary content for respective ones of a plurality of timestamps, and presenting, at a second media presentation device, a first of the plurality of pieces of secondary media when its respective timestamp substantially corresponds to a time value obtained from the clock.

Disclosed are a method, a device and a system of generation of a modified digital media file based on a encoding of a digital media file with a decodable data such that the decodable data is indistinguishable through a human ear from a primary audio stream. In one embodiment, a method of an audio encoding system includes validating a user of the audio encoding system as a publisher, associating a response action to a message of the user, the response action is at least one of a call-back action, a web-form action, and a resource-page redirect action using a processor and a memory, generating a unique identifier through a hash function applied to the response action associated with the message of the user, encoding a digital media file associated with the message with a decodable data using the unique identifier such that the decodable data is indistinguishable from a primary audio stream through a human ear, and generating a modified digital media file associated with the digital media file based on the encoding of the message with the decodable data such that the decodable data is indistinguishable from a primary audio stream through the human ear.

Disclosed is an audio watermark insertion method. The audio watermark insertion method includes performing a modulated complex lapped transform (MCLT) on a first audio signal, inserting a bit string of a watermark in the first audio signal obtained by performing the MCLT, performing an inverse modified discrete cosine transform (IMDCT) on the first audio signal in which the bit string is inserted, and obtaining a second audio signal, which is the first audio signal in which the watermark is inserted, by performing an overlap-add on a signal obtained by performing the IMDCT and a neighbor frame signal.

Disclosed is an audio watermark insertion method. The audio watermark insertion method includes performing a modulated complex lapped transform (MCLT) on a first audio signal, inserting a bit string of a watermark in the first audio signal obtained by performing the MCLT, performing an inverse modified discrete cosine transform (IMDCT) on the first audio signal in which the bit string is inserted, and obtaining a second audio signal, which is the first audio signal in which the watermark is inserted, by performing an overlap-add on a signal obtained by performing the IMDCT and a neighbor frame signal.

Encoding and decoding methods and apparatus are described. An example method is described for embedding information into audio by determining a first set of frequency components to represent a synchronization block, the synchronization block representing one of a plurality of different message types, one frequency component from each set of frequency components being located in a respective code band, and spacing between adjacent code bands is equal to or less than the spacing between adjacent frequency components of each code band. Determining amplitudes of respective ones of the first set of frequency components representing the synchronization block based on a masking ability of an audio block of the audio. Synthesizing the first set of frequency components representing the synchronization block to determine a first set of synthesized code frequency components, based on the determined amplitudes. Combining the first set of synthesized code frequency components with the audio block.

Encoding and decoding methods and apparatus are described. An example method is described for embedding information into audio by determining a first set of frequency components to represent a synchronization block, the synchronization block representing one of a plurality of different message types, one frequency component from each set of frequency components being located in a respective code band, and spacing between adjacent code bands is equal to or less than the spacing between adjacent frequency components of each code band. Determining amplitudes of respective ones of the first set of frequency components representing the synchronization block based on a masking ability of an audio block of the audio. Synthesizing the first set of frequency components representing the synchronization block to determine a first set of synthesized code frequency components, based on the determined amplitudes. Combining the first set of synthesized code frequency components with the audio block.

A second screen system comprises a first screen that renders a first content comprising watermarks of a first type and watermarks of a second type. The watermarks of the first type are captured by a second screen that reacts to these watermarks. The second screen displays information to a user and receives user input. The second screen also watermarks a second content with watermarks of the second type and renders the second content. A third device captures watermarks of the second type in both the first content and the second content. Since the watermarks embedded by the second screen can depend on the user's actions, the third device can indirectly react to the user's actions.

A second screen system comprises a first screen that renders a first content comprising watermarks of a first type and watermarks of a second type. The watermarks of the first type are captured by a second screen that reacts to these watermarks. The second screen displays information to a user and receives user input. The second screen also watermarks a second content with watermarks of the second type and renders the second content. A third device captures watermarks of the second type in both the first content and the second content. Since the watermarks embedded by the second screen can depend on the user's actions, the third device can indirectly react to the user's actions.