diff --git a/src/ISM.jl b/src/ISM.jl
index 0bf25f3..28a3ffe 100644
--- a/src/ISM.jl
+++ b/src/ISM.jl
@@ -60,12 +60,12 @@ function ISM_RectangularRoom_core(
     tx::SVector{3, T},                  # transmitter position
     rx::SVector{3, T},                  # reveiver position
     B::SMatrix{3, 3, T},                # receiver orientation
-    dp::DirectivityPattern,             # Receiver directivity pattern
+    dp::AbstractDirectivityPattern,     # Receiver directivity pattern
     L::Tuple{T, T, T},                  # room size (Lx, Ly, Lz)
     β::Tuple{T, T, T, T, T, T},         # Reflection coefficients (βx1, βx2, βy1, βy2, βz1, βz2)
     c::T,                               # velocity of the wave
     fs::T,                              # sampling frequeyncy
-    order::Tuple{<:Int, <:Int}, # order of reflections; min max
+    order::Tuple{<:Int, <:Int},         # order of reflections; min max
     Nh::Integer,                        # h lenght in samples
     Wd::T,                              # Window width
     ISD::T,                             # Random displacement of image source
@@ -103,7 +103,7 @@ function ISM_RectangularRoom_core!(
     tx::SVector{3, T},                  # transmitter position
     rx::SVector{3, T},                  # reveiver position
     B::SMatrix{3, 3, T},                # receiver orientation
-    dp::DirectivityPattern,             # Receiver directivity pattern
+    dp::AbstractDirectivityPattern,     # Receiver directivity pattern
     L::Tuple{T, T, T},                  # room size (Lx, Ly, Lz)
     β::Tuple{T, T, T, T, T, T},         # Reflection coefficients (βx1, βx2, βy1, βy2, βz1, βz2)
     c::T,                               # velocity of the wave
diff --git a/src/types.jl b/src/types.jl
index ff7a829..cf5cf5a 100644
--- a/src/types.jl
+++ b/src/types.jl
@@ -12,12 +12,12 @@ export RIRConfig, ISMConfig
 
 
 
-abstract type DirectivityPattern end
-struct OmnidirectionalPattern <: DirectivityPattern end
-struct SubcardioidPattern     <: DirectivityPattern end
-struct CardioidPattern        <: DirectivityPattern end
-struct HypercardioidPattern   <: DirectivityPattern end
-struct BidirectionalPattern   <: DirectivityPattern end
+abstract type AbstractDirectivityPattern end
+struct OmnidirectionalPattern <: AbstractDirectivityPattern end
+struct SubcardioidPattern     <: AbstractDirectivityPattern end
+struct CardioidPattern        <: AbstractDirectivityPattern end
+struct HypercardioidPattern   <: AbstractDirectivityPattern end
+struct BidirectionalPattern   <: AbstractDirectivityPattern end
 
 
 const Omnidirectional = OmnidirectionalPattern()
@@ -28,20 +28,22 @@ const Bidirectional   = BidirectionalPattern()
 
 
 
-struct TxRx{T<:AbstractFloat}
-    position::SVector{3, T}            # Position
-    B::SMatrix{3, 3, T}                # Orientation
-    directivity::DirectivityPattern    # Directivity pattern
+abstract type AbstractTxRx end
+
+struct TxRx{T<:Real} <: AbstractTxRx
+    position::SVector{3, T}                 # Position
+    B::SMatrix{3, 3, T}                     # Orientation
+    directivity::AbstractDirectivityPattern # Directivity pattern
 end
 
 function TxRx(position, B=SMatrix{3,3}(1.0I), d=Omnidirectional)
-    TxRx(position, B, d)
+    TxRx(position |> SVector{3}, B, d)
 end
 
 
 abstract type Room end
 
-struct RectangularRoom{T<:AbstractFloat} <: Room
+struct RectangularRoom{T<:Real} <: Room
     c::T
     L::Tuple{T, T, T}
     β::Tuple{T, T, T, T, T, T}
@@ -54,19 +56,19 @@ abstract type RIRConfig end
 """
 
 """
-struct ISMConfig{T<:AbstractFloat, I <: Integer} <: RIRConfig
+struct ISMConfig{T<:Real, I<:Integer, R<:AbstractRNG} <: RIRConfig
     order::Tuple{I, I}  # Order of reflection [low, high]
     fs::T               # Sampling frequency
     N::I                # Number of samples in impulse response
     Wd::T               # Single impulse width
     hp::Bool            # High pass filter
     isd::T              # Image source distortion (randomized image method)
-    lrng::AbstractRNG
+    lrng::R
 end
 
 function ISMConfig(
     order=(0, -1),
-    fs=16000,
+    fs=16000.0,
     N=4000,
     Wd=8e-3,
     hp=true,