Systems, methods and articles to provide content in networked environment

A method of operation of at least one device in a content delivery system, the method comprising:

• monitoring an audio channel for subaudible tones of at least one defined duration and at least one defined frequency, the subaudible tones associated with respective ones of at least some of a plurality of media content segments on the audio channel, by the at least one device;
• in response to at least some of the subaudible tones, causing at least one of a modifying or an adding of metadata to a delivery of the media content segment associated with the respective subaudible tone, by the at least one device;
• identifying at least one defined rule to apply based on at least one of the defined duration or the defined frequency of the subaudible tone in the audio, by the at least one device;
• identifying at least one piece of metadata for inclusion in the delivery of the respective one of the media content segments based on the identified at least one rule, by the at least one device;
• causing an advertisement injection component to include the identified at least one piece of metadata in the delivery of the respective one of the media content segments in response to the identified at least one rule, by the at least one device,
• wherein the identified at least one piece of metadata causes the advertisement injection component to pass the respective one of the media content segments without modification of any attributes thereof, and responsive to an absence of the identified at least one piece of metadata the advertisement injection component modifies at least one attribute of the respective one of the media content segments.

A method of operation of at least one device in a content delivery system, the method comprising:

• performing audio spectrum analysis of an audio channel for detection of subaudible tones associated with respective ones of at least some of a plurality of media content segments on the audio channel;
• for each of a number of defined frequencies at which subaudible tones are expected, performing instantaneous phase counting that counts transitions of at least one of amplitude or phase via an amplitude/phase transition counter;
• determining if a defined number of transitions occurred during a temporal window;
• indicating that a subaudible tone has been detected in response to a determination that the defined number of transitions occurred during the temporal window;
• in response to the indication that a subaudible tone has been detected, causing at least one of a modifying or an adding of metadata to a delivery of one of the at least some of a plurality of media content segments associated with the respective subaudible tone;
• and
• providing the metadata to an advertisement injection system located relatively downstream of the at least one device which causes the advertisement injection system to pass the respective content segment without modification of any attributes thereof, by the at least one device, wherein responsive to an absence of the provided metadata the advertisement injection system modifies at least one attribute of the respective content segment.