Ron I got some info by email from somebody who cannot post here.
  It appears BROADCOM (BRCM) is a major force in chips for settop boxes: broadcom.com (choose settop boxes, then choose products)
  snip:
  BCM7315 Single-Chip Satellite Set-Top Box Decoder A satellite set-top box system on a single chip, integrating Broadcom’s field-proven BCM4500 QPSK Demodulator technology, as well as technology derived from Broadcom’s existing cable products such as the BCM7115 cable STB single-chip device.
  BCM97315 DBS Set-Top Box Reference Design Set-top box reference design is a complete hardware and software design based on the BCM7315 single-chip satellite device.
  BCM7100 Single-Chip Cable Set-Top Box System A cable set-top box system on a single chip, integrating Broadcom’s field-proven BCM3120 Cable Transceiver technology, BCM7010 MPEG/AC3 Decoder technology, BCM7014 Advanced 2D/3D Graphics and System Integration technology, BCM3310 MIPS Microprocessor technology, all key interfaces to external memory and I/O, and the necessary peripherals for set-top box applications.
  BCM7110 Single-Chip Cable Set-Top Box With DOCSIS 1.1 And PVR A single-chip set-top box device that combines the key aspects required for the next generation of set-top boxes including cost-effective single-chip design, personal video recording (PVR), broadband communication via DOCSIS 1.1 cable modem, and support of all major global standards for worldwide deployment.
  BCM97110 Single-Chip DOCSIS 1.1/PVR Set-Top Box Development Platform An advanced set-top box development platform supporting standard definition decoding, broadband cable modem and personal video recording (PVR).
  BCM7115 Single-Chip Set-Top Box with PVR A single-chip set-top box device that combines the key aspects required for the next generation of set-top boxes including cost-effective single-chip design, personal video recording (PVR), communication via DAVIC or other protocol and support of all major global physical layer standards for worldwide deployment.
  BCM97115 Single-Chip Interactive Set-Top Box Reference Design With PVR An interactive set-top box development platform supporting standard definition decoding, integrated peripherals, and personal video recording (PVR). 
  Maybe we should make a shortlist first and then analyse a bit.
  All the best Cor |