mirror of
https://github.com/trcwm/Speech256.git
synced 2025-06-07 16:48:32 +02:00
Removed superfluous comments. Added 2x/double_mode for A1 coefficients to filter engine.
This commit is contained in:
Niels Moseley
parent
cf89706963
commit
bdcd8a3d8f
@ -1,7 +1,7 @@
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64 736 l
|
||||
h
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||||
</path>
|
||||
<path stroke="black" arrow="normal/normal">
|
||||
376 672 m
|
||||
96 672 l
|
||||
96 696 l
|
||||
112 696 l
|
||||
</path>
|
||||
</page>
|
||||
</ipe>
|
||||
|
||||
@ -6,11 +6,6 @@
|
||||
// http://www.moseleyinstruments.com
|
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//
|
||||
|
||||
// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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||||
// NO, NO, NO, NO, NO, NO, NO, NO, NO, NO, NO, NO, NO, NO, ..
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// this is all arse-backwards as fuck ..
|
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// we should use a shift register for states + coefficients!!
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// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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module FILTER (
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clk,
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@ -52,6 +47,7 @@ module FILTER (
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reg state_sel;
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reg accu_sel;
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reg do_accu;
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reg double_mode;
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reg update_states;
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reg update_coeffs;
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reg [3:0] cur_state;
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@ -80,6 +76,7 @@ module FILTER (
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assign mul_coeff = coefmem[11];
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assign sig_out = accu;
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||||
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||||
// clocked stuff..
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||||
always @(posedge clk, negedge rst_an)
|
||||
begin
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||||
if (rst_an == 0)
|
||||
@ -102,6 +99,7 @@ module FILTER (
|
||||
accu_sel <= 0;
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||||
state_sel <= 0;
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||||
do_accu <= 0;
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||||
double_mode <= 0;
|
||||
|
||||
update_states <= 0;
|
||||
update_coeffs <= 0;
|
||||
@ -149,7 +147,10 @@ module FILTER (
|
||||
// update the accumulator if necessary
|
||||
if (do_accu)
|
||||
begin
|
||||
accu <= accu_in + mul_result;
|
||||
if (double_mode)
|
||||
accu <= accu_in +{mul_result[14:0], 1'b0};
|
||||
else
|
||||
accu <= accu_in + mul_result;
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||||
end
|
||||
|
||||
// !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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||||
@ -162,6 +163,7 @@ module FILTER (
|
||||
mul_start <= 0;
|
||||
state_sel <= 0;
|
||||
accu_sel <= 0;
|
||||
double_mode <= 0;
|
||||
update_states <= 0;
|
||||
update_coeffs <= 0;
|
||||
case(cur_state)
|
||||
@ -181,11 +183,6 @@ module FILTER (
|
||||
// to reach a valid state
|
||||
begin
|
||||
cur_state <= 4'b0010;
|
||||
//for(i=0; i<6; i=i+1)
|
||||
//begin
|
||||
// $display("s1[%d] = %x", i, state1[i]);
|
||||
// $display("s2[%d] = %x", i, state2[i]);
|
||||
//end
|
||||
end
|
||||
4'b0010: // wait for multiplier to complete
|
||||
begin
|
||||
@ -194,6 +191,7 @@ module FILTER (
|
||||
cur_state <= 4'b0011;
|
||||
accu_sel <= 0; // accu = sig_in + mul_result
|
||||
do_accu <= 1;
|
||||
double_mode <= 1; // a1 coefficient has double the weight
|
||||
end
|
||||
end
|
||||
4'b0011: // update accu, 1st section only!
|
||||
@ -252,6 +250,7 @@ module FILTER (
|
||||
cur_state <= 4'b1011;
|
||||
accu_sel <= 1; // accu = accu + mul_result
|
||||
do_accu <= 1;
|
||||
double_mode <= 1; // a1 coefficient has double the weight
|
||||
end
|
||||
end
|
||||
4'b1011: // update accu, 2nd..5th section only!
|
||||
|
||||
@ -46,7 +46,7 @@ module FILTER_TB;
|
||||
#10
|
||||
coef_load = 1;
|
||||
// section 1
|
||||
coef_in = {1'b0, 9'd128}; // sign-magnitude a1 = -0.25
|
||||
coef_in = {1'b0, 9'd64}; // sign-magnitude a1 = -0.25
|
||||
#10
|
||||
coef_in = {1'b1, 9'd256}; // sign-magnitude a2 = 0.5
|
||||
#10
|
||||
|
||||
@ -31,4 +31,4 @@ The testbench should approximately give the following step response results:
|
||||
- 205
|
||||
- 205
|
||||
|
||||
Note that there might be a few +/- 1 round-off errors.
|
||||
Note that may be a few +/- 1 round-off errors.
|
||||
|
||||
Loading…
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Reference in New Issue
Block a user