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Introduction 1
Introduction
The FM Radcap PCIe is a radio capture card designed for simultaneous
recording of multiple radio stations. The frequency of each station is set in
software and its audio appears as a standard Windows audio input device.
RDS decoding is also supported.
The card uses a high-speed A/D converter to digitise the entire FM band,
with up to 32 individual tuners. The Radcap achieves exceptionally
low audio distortion through the use of linear phase filtering and
mathematically precise FM demodulation and stereo decoding. FM
demodulation and stereo decoding is done in FPGA fabric, while RDS
decoding, if enabled, is performed in the driver using the host CPU’s SSE-2
instruction set. This division of labour between the FPGA and driver allows
greatest flexibility in catering for future baseband technologies while
minimising the CPU overhead of the card.
A WDM driver for Windows XP (SP2 or later), Server 2003, Vista, Server
2008, Windows 7, Server 2008 R2, Windows 8 and Server 2012 is supplied
as well as software for setting the tuner frequencies and monitoring the
received audio. A programming API and DLL for software control and
monitoring are also supplied.
The card can be configured to operate in stereo, mono or paired mono (two
mono stations combined on a 2-channel audio stream) modes. Multiple
cards can be used in a single PC, subject to available CPU bandwidth. The
audio de-emphasis may also be set to either 50us or 75us. In Australia, New
Zealand and Europe 50us is used, while in the USA and Canada 75us is used.
A utility called FMSpectrum is supplied. This displays the RF spectrum from
85MHz to 111MHz, using data from the card’s front-end 256-point FFT and
may be useful in selecting the best location for the antenna or resolving
interference problems.
The card is factory-configured for 6 (PC-FM6), 12, 18, 24 or 32 (PC-FM32)
stations, but needs licensing on your PC hardware. It may be expanded in
the field for an additional charge.
System Requirements
Platform: Windows XP SP2 or later (32-bit or 64-bit
versions)
Bus:
PCI Express v1.1 (single lane)
Processor: 1GHz Pentium 4 or better (6 stations)
2.5GHz Pentium 4 or better (32 stations)
Memory: 256MB minimum (1GB for Windows Vista /
Windows 7 / Server 2008 /Server 2008-R2, 2GB
for Windows 8 / Server 2012)
Other: Sound card or motherboard sound port for
monitoring