1. A television receiver, comprising: one or more processors; a plurality of tuners communicatively coupled with the one or more processors; an audio-video output interface communicatively coupled with the one or more processors; and a non-transitory computer readable storage medium communicatively coupled with and readable by the one or more processors and having stored therein processor-readable instructions that, when executed by the one or more processors, cause the one or more processors to perform operations including: receiving video content using an inactive tuner of the plurality of tuners; obtaining text data corresponding to an audio portion of the video content; evaluating the text data to identify frequencies of words appearing in the text data; receiving input corresponding to determination of one or more user-designated keywords; storing the one or more user-designated keywords to a word list, wherein the word list includes at least a first keyword; determining that the first keyword appears in the text data with a first frequency greater than a first threshold frequency; and generating a first interface for output by the audio-video output interface for displaying on a display device in real-time upon determining that the first frequency is greater than the first threshold frequency, wherein the first interface includes a notification identifying a match of the first keyword.
4. The television receiver of claim 1 , wherein evaluating includes generating a database including one or more words in the text data and tracking appearances of the one or more words in the text data using the database.