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The company Apple should have named Pop Up Archive, whose former service Audiosearch offered tools for audio and podcast producers. It writes 9to5mac.
This service is now closed since a month back, but Crunchbase he saves a description of the service. Among other things, the service should be able to transcribe speech to text that can then be made searchable through different search engines; which persons are involved in or mentioned in the podium, which subjects are treated and so on.
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If the information that Apple purchased Pop Up Archive really is correct, we'll see similar functionality in the iTunes library in the future, maybe both for users and developers. Apple has since worked at least for the summer to get more data about podcasts, including a more reliable way to measure the number of readings that have so far been counted in number of downloads.