The latest radical development of this system now allows programming of the RDS Coder via Satellite, an indispensable innovation that AEV has implemented with the creation of the RDS 4500. Radio Data System is an inaudible, digital information, transmission system, introduced by FM radio stations in addition to audio programs. RDS the latest Satellite-programmable version. The stereo separation levels are constantly over 65 dB. The employment of a great quantity of “samples” offers a better spectrum clarity and mantains the MPX signal constant. It employs a digital modulator at a sampling rate of 32x that generates frequencies at 19 and 38 KHz for respectively the pilot and subcarrier.
Stargate can be installed instantly and can be matched perfectly to any transmission system without calibration. The result is the most advanced that a stereo broadcasting system can offer, with an exceptional array of features.īesides guaranteeing excellent stereo separation between channels, AEV’s Digital Stereo Encoder ensures a transparency of sound never before reached, whilst maintaining exceptional stability.
Fm encoder stereo installation software#
Low-budget non-profit community radio stations here still run analog equipment but the stereo encoder is always included as a plus in low-price low-power transmitters, so there seems to be no need for a software based encoder.AEV Stargate Evo is a digital stereo encoder and RDS coder for broadcast applications that has been designed using highly innovative technology. They usually go for 24 ins external sound cards.
Fm encoder stereo installation Pc#
PC based recording studios still need them. So audio cards don't seem to be critical in radio work nowadays. Those PCs don't usually rely on audio cards, they stream digital audio straight to the console or routing devices without going analog. Standard PCs still have their place in the typical radio studio audio chain running radio automation software (sophisticated playlist players) although this task is slowly being taken over by the mixing consoles themselves. The only unavoidable analog device in the audio chain seems to be the microphone (and its ADC converter, usually part of the mixing console). Studio-transmitter links are digital, audio consoles are digital, all routing is digital, audio processing is digital. Nowadays state-of-the-art FM TX exciters are digital in-out (direct digital FM synthesis). Finally I dusted out an old Itame encoder which did the work. I ran that test some 10 years ago looking for a temporary solution for one of our unattended repeater stations until proper equipment was bought.
Ken, thanks for your interest but I didn't mean I was interested in making this work. The s19 and s38 samples could be obtained by reading preloaded arrays (for efficiency).
The L and R streams must be 15 kHz lowpass filtered previously to avoid aliasing. Let's assume you have L and R samples named L and R, a sinusoidal 19 kHz stream of samples named s19 and a 38 kHz stream of samples named s38. The "Balanced Modulator" block that seemed elusive to ken is just a multiply operation. There are 2 optional SCA and one RDS feeds missing from the scheme, though. If you're still interested in coding your own version just refer to the diagram posted by ken. I tested one of them in our radio station a few years ago with deceiving results. Search for "software fm stereo encoder" in the net. There are a few programs / plugins already available that do this.
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