Sonos Sonos 4 is a software real time multiband compressor limiter for radio broadcasters. With this software and a suitable sound card it is possible to turn a Windows PC into an radio broadcast processor.
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radio radio broadcast broadcast multiband broadcast processor

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Real time multiband compressor limiter for radio broadcasters With this software and a suitable sound card it is possible to turn a Windows PC into an radio broadcast processor. The processor achieves its loudness through the use of a unique distortion masked final clipper. Sonos 4 interfaces to sound cards using either ASIO or the Windows native multimedia sound interface.If the ASIO interface is used then low latency mode can be used.Use of ASIO is dependent upon the sound card having ASIO drivers.Most 'Pro' sound cards support ASIO.Low latency mode enables off air monitoring while speaking just as hardware FM & AM processors do. The application is password protected to prevent unauthorized tampering. Sonos 4 can be automatically started when Windows boots.Additionally the application can be made to minimize to the 'Sys tray'. Sonos 4 supports multiple instances.It is theoretically possible to have up to twenty processors but CPUs are not powerful enough yet to support all twenty processors. The processor is the central feature of Sonos 4. There are three different processors available mainly differing in the number of bands The nine band (MBL9) is the recommended choice but it may overload some computers so to reduce CPU load a processor with fewer bands can be selected. All four processors share common parts such as four stages of parametric equalization, stereo widener, stereo enhancer, phase rotator, filtering for FM and AM, switchable pre-emphasis for FM. The processor architecture is similar in each of the five processors. Dual band gated AGC is followed by a gated multiband limiter optionally preceded by a multiband compressor. Then optionally there is a dual band limiter.Single band gated limiting is applied before the final clipper. Pre-emphasis for FM is applied partially before the multiband section and partially after the final clipper. The processor settings are fully adjustable with easy to use saving and loading of preset files. There is a 'Daypart' scheduler to enable changes of preset (format) by time of day and day of the week. The processors have a 'Fail Over' or failsafe feature that switches the input to a backup should the main source fail. Finally the processor can be disabled to reduce CPU load. It is possible to drive FM transmitter MPX inputs directly from Sonos 4.It needs a 192kHz sound card with adequate bandwidth to pas the MPX signal. The stereo multiplex encoder has adjustable clipping for extra loudness. The pilot tone amplitude is adjustable. The RDS/RBDS encoder supports all the basic RDS features plus it has a scrolling 'Program Service Name' feature with multiple messages that can be set up as a rotation. In addition there is a means of showing current track information. The SCA generator supports frequencies from 20kHz to 90kHz and deviation from 1kHz to 10kHz.

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