Tim-Whittaker-Cambridge-Consultants.pdf

1、10 Nov 2025S4989-P-480 v1.0Commercially ConfidentialHigh-quality comms and DECT NR+Tim Whittaker&Paolo Gatto210 Nov 2025S4989-P-480 v1.0Commercially ConfidentialHigh-quality communications is vital for professional users Telephony bandwidth(3.4kHz)in comms causes fatigue when used long-term BBC rese

2、arch in the 1960s reckoned 10kHz audio bandwidth was required for talkback and intercom Rodman,J,The effect of bandwidth on speech intelligibility,2003 More recent research suggests that there is a useful contribution for comms from audio bandwidth extended up to 14kHz If music is carried by the com

3、ms system(e.g.in foldback applications),full bandwidth audio could be desirable310 Nov 2025S4989-P-480 v1.0Commercially ConfidentialFully-functional wireless extension to matrix intercom system(2001)Before that,a small subset of users(e.g.TV floor manager)had a simple wireless transceiver The wirele

4、ss extension allowed all non-fixed staff to have a fully-functional terminal Cellular system allowed staff to roam across site(TV dressing rooms,technical areas,canteen)64kbit/s payload delivered 7.5kHz voice bandwidth(with the codecs available)and system signallingBreaking the cord:DECT has served

5、us well for over 25 yearsFull function410 Nov 2025S4989-P-480 v1.0Commercially ConfidentialPhilips Telemetry TransceiverHigh-quality audio distribution system(2010)Added true multicast functionality to DECT Upstream acknowledgement scheme from receivers met spectrum etiquette and regulatory requirem

6、ents Audio bandwidth 15kHz stereo or 2-language,using early CELT(now Opus)codecBreaking the cord:DECT has served us well for over 25 yearsTwo-way tour-guide(2015)Push-to-talk for participants sets up a duplex connection for the duration 15kHz mono audio with Opus codec Enhanced(2020)to add sub-group