diff --git a/lib/filter/src/tb_fir_parallel.vhd b/lib/filter/src/tb_fir_parallel.vhd
index 2d6ac47..51aca29 100644
--- a/lib/filter/src/tb_fir_parallel.vhd
+++ b/lib/filter/src/tb_fir_parallel.vhd
@@ -28,12 +28,12 @@ use work.PCK_FIO.all;
 ENTITY tb_fir_parallel IS
 	Generic (
 		ntaps				: integer := 33;
-		nbits_in			: integer := 15;
-		nbits_in_frac		: integer := 15;
+		nbits_in			: integer := 16;
+		nbits_in_frac		: integer := 16;
 		nbits_stages		: integer := 16;
 		nbits_stages_frac	: integer := 15;
-		nbits_out			: integer := 15;
-		nbits_out_frac		: integer := 15;
+		nbits_out			: integer := 16;
+		nbits_out_frac		: integer := 16;
 		has_in_reg			: boolean := false;
 		has_pipe_reg		: boolean := true;
 		has_out_reg			: boolean := false;
@@ -161,7 +161,7 @@ BEGIN
 		
 		while not endfile(fi) loop
 			read(fi, si);
-			x_in <= to_sfixed(to_signed(si, x_in'length), x_in'left, x_in'right);
+			x_in <= to_sfixed(to_signed(si, x_in'length));
 			in_valid <= '1';
 			wait for PERIOD;
 			wait until rising_edge(clk);