Streaming Audio Ad Insertion

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When the log playing the common program gets to a spot block, several things happen:

  • The Ando software is signaled by Enco 1 that a stopset has begun on the over-the-air station
  • The log associated with the streaming audio ad-insertion (Enco 2) begins playing
  • The audio router switches from Enco out 1 (common program) to Enco out 2 so that Enco 2 becomes the source of audio for the stream. Enco 1 is still playing audio for the over-the-air station's program.

    The buffering feature of the Ando software makes this process sound very smooth for the end-users of stream audio.

    Hubert told me that one important consideration in this process is that the spot block playing on the stream must be shorter than that playing over-the-air. For example, a spot block over-the-air is 4 minutes and 10 seconds in length, and the spot block for the stream is just 4 minutes. As the ad-insert audio is playing through the CPU that generates the stream, the Ando software (running on the same CPU) is waiting to receive a logic signal from Enco 1 (in this example) telling it that the over-the-air spot block is over. Because the spot block for the stream is, of necessity, shorter than that for the over-the-air signal, the Ando software does the following:

  • Fill material (stored on the CPU running the Ando software) will start to play at the end of the spot block for the stream.
  • While the fill is playing, Ando is waiting to be signaled from Enco 1 that the over-the-air spotblock is over.
  • Once that signal is received, Ando starts recording or buffering the output of the audio switch (which is now feeding the output of Enco 1)
  • Once the fill material is played, Ando immediately switches over to its buffer, and so the normal common program is once again heard by end users of the stream.

    So in this example, the over-the-air spot block was 4 minutes and 10 seconds. The stream-only spot block was 4 minutes. If Ando started a 30-second fill piece at the end of the stream-only spot block, then when all is said and done for this block, the stream audio is 20 seconds behind the over-the-air audio (ignoring any other types of delays used for the over-the-air signal). So if you were to listen to the stream source in one speaker and the over-the-air source in another speaker (again neglecting additional delays used for the over-the-air signal) you would note that the stream source is always behind that of the over-the-air source. The amount of time depends on the net difference in length of the spot blocks.

    The end-users hear a smooth transition when the stream source returns to the common program feed.

    -- continued on page 4

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