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- update comments

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- add led_level_controller Const
This commit is contained in:
Davide Cavagnola
2025-06-03 14:55:23 +02:00
parent 79373768fa
commit dff2eb439d
11 changed files with 73 additions and 72 deletions
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17
LAB3/src/volume_saturator.vhd
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@@ -20,14 +20,14 @@ ENTITY volume_saturator IS
aresetn : IN STD_LOGIC; -- Active-low asynchronous reset
-- AXI4-Stream Slave Interface (Extended width input from multiplier)
s_axis_tvalid : IN STD_LOGIC; -- Input data valid signal
s_axis_tvalid : IN STD_LOGIC; -- Input data valid signal
s_axis_tdata : IN STD_LOGIC_VECTOR(TDATA_WIDTH - 1 + 2 ** (VOLUME_WIDTH - VOLUME_STEP_2 - 1) DOWNTO 0); -- Wide input data from multiplier
s_axis_tlast : IN STD_LOGIC; -- Channel indicator (0=left, 1=right)
s_axis_tready : OUT STD_LOGIC; -- Ready to accept input data
s_axis_tlast : IN STD_LOGIC; -- Channel indicator (0=left, 1=right)
s_axis_tready : OUT STD_LOGIC; -- Ready to accept input data
-- AXI4-Stream Master Interface (Original width output for audio)
m_axis_tvalid : OUT STD_LOGIC; -- Output data valid signal
m_axis_tdata : OUT STD_LOGIC_VECTOR(TDATA_WIDTH - 1 DOWNTO 0); -- Saturated audio sample output
m_axis_tdata : OUT STD_LOGIC_VECTOR(TDATA_WIDTH - 1 DOWNTO 0); -- Saturated audio sample output
m_axis_tlast : OUT STD_LOGIC; -- Channel indicator passthrough
m_axis_tready : IN STD_LOGIC -- Downstream ready signal
);
@@ -82,12 +82,10 @@ BEGIN
IF signed(s_axis_tdata) > signed(HIGHER_BOUND_VEC) THEN
-- Positive overflow: Clip to maximum positive value
-- This prevents "wraparound" distortion from mathematical overflow
m_axis_tdata <= HIGHER_BOUND_VEC;
ELSIF signed(s_axis_tdata) < signed(LOWER_BOUND_VEC) THEN
-- Negative overflow: Clip to maximum negative value
-- This prevents "wraparound" distortion from mathematical underflow
m_axis_tdata <= LOWER_BOUND_VEC;
ELSE
@@ -109,11 +107,4 @@ BEGIN
END PROCESS;
-- Saturation Purpose and Benefits:
-- 1. Prevents audio distortion from mathematical overflow
-- 2. Maintains audio dynamic range within valid bit representation
-- 3. Reduces wide multiplication results back to standard audio format
-- 4. Provides "soft limiting" behavior for volume control
-- 5. Ensures compatibility with downstream audio processing blocks
END Behavioral;