What is the HDR Function ?
The HDR function shields out the background noise for example during recording of concerts. Currently, only iPhone 5 and HTC One have got this function. However, HTC has been recently caught in a sensitive supply issue of microphone for HTC One when a Dutch court, after an appeal from Nokia, ordered STMicro to stop supplying HDR MEMS for HTC One.
It is unlikely that HTC would require regulatory approval to change the microphone component, in our view. Some large operators will need to do acoustic testing and thus may take some lead time.