Digital Radio Frequency Modulation

Modulation of Several FM Carriers from PCM Data to IF

  • Modulation of stereo FM incl. RDS carriers (broadcaster's name and radio text)
  • Input: PCM data stream
  • Output: IF (25-47 MHz)
  • Modulation of several carriers to a IF signal with selectable frequency offset and damping rate
  • The configuration via register interface is compatible to the NIOS-Avalon-Bus
  • Apart from the configuration, there is no CPU support necessary
  • RDS according to IEC-62106:2009

In combination with the maintech MPEG Audio Layer II Decoder, it is possible to convert in only one head-end cassette up to 48 digital satellite radio channels to FM signals:

Processing of Digital Satellite Radio Programmes and Conversion to Radio Frequency Modulation

In combination with our MPEG Audio Layer II (DVB Audio) Decoder, the FM IP-Core features the processing of digital signals of satellite radio services and converts them to FM signals – an important additional benefit for a cable head-end.

In order to keep on using already existing analogue FM radio receivers, the digital signal has to be converted to a frequency modulated signal.

maintech's IP-Core offers special advantages for that operation: Because of the completely digital modulation, one single headend cassette can convert up to 48 radio channels; the audio quality exceeds that of an analogue modulation by far. RDS information are transmitted, too.

In the head-end station, this single cassette with digital modulation requires not much room. If you are equipped with an already existing hardware for the digital modulation (DVB-T), it may possibly be used for the radio frequency modulation with only little modifications.

  • Processing of digital satellite radio programmes and conversion to FM signals (up to 48 services, depending on the hardware)
  • Completely digital datapath
  • Extraordinary audio quality thanks to the digital modulation
  • Programme information via RDS (broadcaster's name and radio text)
  • Efficiency of the resource requirements
  • 8-48 radio channels per headend cassette
  • New fields of application for already existing hardware

FPGA types: Altera Cyclone 3 (EP3C55), Xilinx Spartan 3 (XC3S400) or others.

Please contact us about your devices - we'll be glad to assist you in choosing components and system design.

 

Further information:

Leaflet FM IP-Core.pdf

 

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