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   -> Volume 6, Issue 2

Hardware: Biorthogonal wavelet filters from Fastman, Inc.
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PostPosted: Mon Jan 27, 1997 9:10 pm    
Subject: Hardware: Biorthogonal wavelet filters from Fastman, Inc.
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#11 Hardware: Biorthogonal wavelet filters from Fastman, Inc.

FASTMAN, Inc. has developed a biorthogonal wavelet filter which is
implemented in a field programmable gate array (FPGA). The
biorthogonal filter takes 16-bit data inputs at 68 MHz and produces an
output stream (also at 68 MHz) which consists of alternating lowpass
and highpass outputs. The hardware is implemented as an Altera
megafunction which means that it can be directly inserted into
hardware systems using Altera FPGA chips. Our hardware utilizes the
same biorthogonal filter used by the FBI's WSQ algorithm. Also
available are controllers which can implement standard wavelet or
wavelet packet algorithms by reading image data or signal data from
memory in the proper sequence.

Unlike a DSP, our filter can compute one wavelet coefficient every
clock cycle. This should prove advantageous especially for wavelet
packet algorithms which require the computation of a large number of
coefficients. Our results show that this filter can compute
coefficients about ten times faster than a DSP with an equivalent
clock speed.

Conversion of the wavelet filter into an ASIC will occur pending
additional funding of current DoD contracts. The ASIC implementation
should be about twice as fast as the FPGA implementation. The
hardware and/or its VHDL source code are available for licensing.
Requests for information should be sent to
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