Montbonnot, France (March 25, 2014)—Digigram has released a new Network Time Protocol (NTP) feature for its IP audio codecs that reduces delay between contiguous FM transmitters.
The feature, for the company's IQOYA *LINK, IQOYA *LINK/LE, and IQOYA *SERV/LINK IP audio codecs, facilitates audio synchronization via an NTP server. Installed across transmitter sites, Digigram IQOYA IP audio codecs aim to ensure that when a radio program is transmitted using several FM transmitters in a multiple-frequency network (MFN), in which all transmitters use different frequencies, the audio delay between two contiguous transmitters remains small and constant. This prevents undesired audio effects for a person in a car listening to an FM receiver that switches from one transmitter to another.
When a transmitter site receives an audio program through a terrestrial IP network and a contiguous transmitter site receives the same audio program through satellite, the IQOYA products can reportedly reduce the audio delay—sometimes as long as one second—between these two transmitters.
Each IQOYA unit can be upgraded via a firmware update to activate the optional NTP feature, which slaves the codec's sample frequency to the clock reference given by the NTP server. The Digigram encoder can then make the associated decoder play out the audio at the same presentation time.