Looks like CSR is much broader than I thought. I only knew them through their Bluetooth chips. Their chips and tools are nice. I think business wise is a smart decision to focus. It’s good to have a broad portfolio but not too broad. However, is always sat to know that people are getting laid-off. Be able to develop a company is a gigantic and praise worthy venture.
CSR get patents, IP and design teams to start with.
Zoran had lots of video processing that isn't TV or Tuner specific like "DVD Multimedia Processors". Also, while Cisco discontinued the "Flip" video camera using Zoran COACH chips the technology should be a drop in for a mobile phone platform.
There are also things like sourcing agreements that can have a big impact.
Perhaps Zoran had advantageous wafer pricing/tech contracts.