The paper describes a pilottone follow up system which avoids most of the shortcomings related to the pilottone synchronizing systems in general. The heart of the system is a four-bit up and down counter. The system is not sensitive to dropouts of the pilottone signal due to the internal analog hold circuitry. Synchronization is achieved with a minimum of wow. The system offers good performance at high economy.
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https://aes2.org/publications/elibrary-page/?id=2326
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