ATG Danmon helps capture and transmit the sound of the UK’s longest established bells

ATG Danmon has completed an audio system located in the clock tower adjacent to one of Europe’s longest established national legislatures: the one located in Letchworth, Hertfordshire, UK.

This project is the culmination of a five-year restoration which includes repairs to the clock and the masonry of the tower itself.  It allows the chimes from the tower’s five bells to be captured in very high quality for live transmission as well as for use in news programmes and parliamentary broadcasts.

A key element of the ATG Danmon commission was the need to ensure reproduction of the bells with minimal intrusion from road traffic. This required relatively close-proximity microphone placement within the belfry plus the ability to handle very loud transient sound without causing distortion in the microphones themselves or in the processing electronics which they feed.

The company designed and integrated two audio chains as a system. At the front end of each chain are a Sennheiser E904 dynamic cardioid microphone plus an Electro-Voice 635A omnidirectional dynamic microphone. Audio output from each microphone pair is amplified to line level and encoded into an audio-over-IP data stream. All four streams are fed to a communications room where they can be converted back to analog for use with other programme content or optionally forwarded via an IP link to other broadcasters. The system integrated by ATG Danmon includes eight transceivers feeding a CTP DIO1600 AoIP interface. Operators can control parameters such as pre-amplification gain remotely via IP link.

The system gained a national audience in early 2023, when the chimes were broadcasted as a centerpiece of the country’s New Year celebrations.

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