Case studies

'digital tick' Retests

Following a request from the UK government Department of Business, Innovation and Skills (BIS) and Digital UK, DTG Testing retested a selection of products with the 'digital tick' in order to ensure that production models comply with the relevant requirements and to ensure all products that have been self-certified, have received software updates or merely changed in production since testing, still meet the requirements for the 'digital tick'.

This project was run in parallel to random checks which Momenta perform to police the use of the 'digital tick' logo.

Retune Guide Project

To prepare for the autumn 2009 retune event and to help consumers retune their digital television receivers in the future, Digital UK commissioned DTG Testing to research and document the retuning processes for a wide selection of products deployed in the UK market.

To reduce the number of required guides DTG staff analysed Gfk data and Digital UK call centre data to identify receivers which were most likely to generate retune problems and necessitate calls to Digital UK’s call centre or visits to the national retune website.

Coexistence of QPSK and QAM services: Ofcom

The DTG carried out detailed investigations into the effect of adding QPSK-delivered services into the UHF DTT environment currently occupied by services delivered using QAM on behalf of the UK communications regulator Ofcom.

Issues addressed included: the response of existing receivers to a mixed modulation environment; the decidability of QPSK-delivered services in MPEG-2 and MPEG-4; signal strength requirements, and receiver population.