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fix left-right sound channels intermodulation

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This commit is contained in:
Eugene Lozovoy
2024-09-17 23:12:12 +03:00
parent b4669e8aca
commit d35e1692eb
5 changed files with 281 additions and 16 deletions
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28
TSConf.sv
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@ -407,19 +407,25 @@ mist_video #(.COLOR_DEPTH(8), .SD_HCNT_WIDTH(11), .OUT_COLOR_DEPTH(VGA_BITS), .B
////////////////// SOUND ///////////////////
dac #(.C_bits(16)) dac_l (
.clk_i(clk_sys),
.res_n_i(~init_reset),
.dac_i({~SOUND_L[15], SOUND_L[14:0]}),
.dac_o(AUDIO_L)
wire dac_l, dac_r;
hybrid_pwm_sd_2ndorder #(.signalwidth(16)) dac (
.clk(clk_sys & ce_28m),
.reset_n(~init_reset),
.d_l({~SOUND_L[15], SOUND_L[14:0]}),
.q_l(dac_l),
.d_r({~SOUND_R[15], SOUND_R[14:0]}),
.q_r(dac_r)
);
dac #(.C_bits(16)) dac_r (
.clk_i(clk_sys),
.res_n_i(~init_reset),
.dac_i({~SOUND_R[15], SOUND_R[14:0]}),
.dac_o(AUDIO_R)
);
reg [23:0] mute_cnt = 0;
always @(posedge clk_sys) begin
if (init_reset)
mute_cnt <= 1;
else if (mute_cnt && ce_28m)
mute_cnt <= mute_cnt + 1'b1;
end
assign AUDIO_L = mute_cnt? 1'bZ : dac_l;
assign AUDIO_R = mute_cnt? 1'bZ : dac_r;
endmodule