From c5802d6d467b387f9d2722f59d43c03c83b11fdc Mon Sep 17 00:00:00 2001 From: Erik Kooistra <kooistra@astron.nl> Date: Thu, 19 Jul 2018 12:36:53 +0000 Subject: [PATCH] Use LOFAR PFIR coefficients that have no DC. --- .../src/vhdl/apertif_unb1_bn_filterbank.vhd | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/applications/apertif/designs/apertif_unb1_bn_filterbank/src/vhdl/apertif_unb1_bn_filterbank.vhd b/applications/apertif/designs/apertif_unb1_bn_filterbank/src/vhdl/apertif_unb1_bn_filterbank.vhd index bab42fe9d3..4be36d47b5 100644 --- a/applications/apertif/designs/apertif_unb1_bn_filterbank/src/vhdl/apertif_unb1_bn_filterbank.vhd +++ b/applications/apertif/designs/apertif_unb1_bn_filterbank/src/vhdl/apertif_unb1_bn_filterbank.vhd @@ -120,9 +120,10 @@ ARCHITECTURE str OF apertif_unb1_bn_filterbank IS CONSTANT c_pps_delay_max : NATURAL := 2**12 - 1; -- 4095 * 5 ns ~= 20000 ns ~= 6 km @ speed of light in air - -- Wideband Poly Phase Filter Bank - CONSTANT c_wpfb_coefs_file_prefix : STRING := "hex/coefs_wide"; -- use same PFIR coefficients as in LOFAR - --CONSTANT c_wpfb_coefs_file_prefix : STRING := "hex/coefs_nodc_wide"; -- use LOFAR PFIR coefficients that have no DC + -- Wideband Poly Phase Filter Bank + -- Use $RADIOHDL/libraries/dsp/filter/src/python/diff_lofar_coefs to verify that the correct PFIR coefficients are used. + --CONSTANT c_wpfb_coefs_file_prefix : STRING := "hex/coefs_wide"; -- use same PFIR coefficients as in LOFAR + CONSTANT c_wpfb_coefs_file_prefix : STRING := "hex/coefs_nodc_wide"; -- use LOFAR PFIR coefficients that have no DC CONSTANT c_ram_st_sst_adr_w : NATURAL := 12; CONSTANT c_ram_fil_coefs_adr_w : NATURAL := 15; -- GitLab