How to reverse-engineer/find datasheet for an IC
More often than not, such ICs are custom made for a specific purpose. Their datasheets and other such information is usually private, and not publicly available.

I found a device which fits your description (called Inter-m CDC-2050), and which includes this IC. I couldn't find any datasheet for it, though.

https://www.manualslib.com/manual/972704/Inter-M-Cdc-2050.html#manual