New- MY Guide For Stereo to 5.1

[raquete]

Originally Posted by dannybz

Can you please explain the settings for the surrounds. The page is not longer available. Thanks

welcome.
guide is old, have others much better but for fun and tests here the adjusts:

Center



Surrounds


cheers!

[SallyDog]

or, go here:

http://surroundbyus.com/

[dannybz]

Thanks for the post raquete. I will give it a try. Im trying to encode an avi with surround sound... Does this mean the sound will be close to 5.1 Dolby Digital??
My past encodings have all been stereo and the programs I have are Adobe Audition, BeLight, BeSweet, GraphEdit, Hypercube Trascoder, CCE Encoder, AviSynth and Spruce DVD Maestro. I am not expert in using them but I know quite the basics of each. I am hoping to find a very straight forward guide to converting stereo to surround, converting to AC3 then encoding to DVD.... without the hassle of buying subsidiary programs.

[Jenyok]

Algorithm to convert stereo to 5.1 audio.
.

#
# Algorithm to convert real stereo audio clip to 5.1 audio clip
# 
# Input audio clip must be minimum 96 kHz / 24 bits integer real stereo audio clip
#
# All Temporary variables of audio clip in algorithm must be 32 bits integer stereo or mono audio clip
#
# All Output audio clips must be 24 bits integer mono audio clips
#



Input						     # Input must be stereo audio signal 96 kHz / 24 bits
Input      = Normalize(Input, 1.0)           	     # Normalize audio signal Input to +0dB


LR         = Normalize(Input, 0.251)		     # Normalize audio signal LR to -12dB, stereo
LR         = ConvertAudioTo32bit(LR)		     # Resolution LR 32bits, -12dB, stereo


LRm        = FFT_HighPass_Filter(LR, 200)            # FAST FOURIER TRANSFORM High Pass Filter "/----" 200Hz to LRm, -12dB, stereo
LRm        = ConvertAudioTo32bit(LRm)		     # Resolution LRm 32 bits, -12dB, stereo


# Subwoofer channel
#
LFE        = MixAudio(LR, LRm, 1.0, -1.0)            # LFE = LR - LRm, 32 bits, stereo
# or maybe so or together two lines
#LFE        = FFT_LowPass_Filter(LR, 200)             # FAST FOURIER TRANSFORM Low Pass Filter "----\" 200Hz to LFE, -12dB, stereo

LFE        = ConvertAudioTo32bit(LFE)	             # Resolution LFE 32 bits, -12dB, stereo
LFE        = AmplifyDB(LFE, +9)                      # Amplify relative audio signal LFE on +9dB (-12dB +9dB), 32 bits, stereo

LFEl       = GetChannels(LFE, 1)		     # Get left audio channel from audio signal LFE, 32 bits, stereo
LFEl       = ConvertToMono(LFEl)                     # Convert audio signal LFEl, 32 bits, mono
LFEr       = GetChannels(LFE, 2)		     # Get right audio channel from audio signal LFE, 32 bits, stereo
LFEr       = ConvertToMono(LFEr)                     # Convert audio signal LFEr, 32 bits, mono

LFE        = MixAudio(LFEl, LFEr, 0.5, 0.5)          # LFE = LFEl + LFEr, 32 bits, stereo 
LFE        = ConvertToMono(LFE)                      # Convert audio signal LFE, 32 bits, mono
LFE        = SHIFTPHASE(LFE, +90, 200)               # Shift LFE phase audio signal to +90 grad, frequency 200Hz, 32 bits, mono
LFE        = ConvertAudioTo24bit(LFE)		     # Resolution LFE 24 bits, mono


# Central channel
#
C          = Normalize(LRm, 0.707)                   # Normalize audio signal C to -3dB, 32 bits, stereo
C          = ConvertAudioTo32bit(C)	             # Resolution C 32 bits, -3dB, stereo

Cl         = GetChhanel(C, 1)                        # Get left audio channel from audio signal C, 32 bits, stereo
Cl         = ConvertToMono(Cl)                       # Convert audio signal Cl, 32 bits, mono
Cr         = GetChhanel(C, 2)                        # Get right audio channel from audio signal C, 32 bits, stereo
Cr         = ConvertToMono(Cr)                       # Convert audio signal Cr, 32 bits, mono

C          = MixAudio(Cl, Cr, 0.5, 0.5)              # C = 0.707 * Cl + 0.707 * Cr, 32 bits, mono
C          = ConvertToMono(C)                        # Convert audio signal C, 32 bits, mono
C          = AmplifyDB(C, +3)                        # Amplify relative audio signal C on +3dB, 32 bits, mono
C          = ConvertAudioTo24bit(C)		     # Resolution C 24 bits, mono


# Front channels preliminary
#
Lc         = GetChhanel(LRm, 1)                      # Get left audio channel from audio signal LRm, -12dB, 32 bits, stereo
Lc         = ConvertToMono(Lc)                       # Convert audio signal Lc, -12dB, 32 bits, mono
Rc         = GetChhanel(LRm, 2)                      # Get right audio channel from audio signal LRm, -12dB, 32 bits, stereo
Rc         = ConvertToMono(Rc)                       # Convert audio signal Rc, -12dB, 32 bits, mono
NLc1       = MixAudio(Lc, Rc, 0.99, -0.33)           # NLc1 = 1.5 * Lc - 0.5 * Rc, 32 bits, mono
NRc1       = MixAudio(Rc, Lc, 0.99, -0.33)           # NRc1 = 1.5 * Rc - 0.5 * Lc, 32 bits, mono
LfRf       = MergeChannels(NLc1, NRc1)               # Merge channels NLc1, NRc1 to stereo singal LfRf, 32 bits, stereo
LfRf       = ConvertAudioTo32bit(LfRf)	             # Resolution LfRf 32 bits, -3dB, stereo
LfRf       = AmplifyDB(LfRf, +3.61)                  # Amplify relative audio signal LfRf on +3.61dB, 32 bits, stereo


# Rear channels
#
LRm_reverb = REVERB(LRm, "Concert Hall Light")       # Reverberation "Concert Hall Light, No combine source Left and Right", 32 bits stereo
LRm_reverb = ConvertAudioTo32bit(LRm_reverb)	     # Resolution LRm_reverb 32 bits, stereo
LRm_reverb = MixAudio(LRm_reverb, LRm, 1.0, -1.0)    # LRm_reverb = LRm_reverb - LRm, 32 bits, stereo 
LRm_reverb = AmplifyDB(LRm_reverb, +6)               # Amplify relative audio signal LRm_reverb on +6dB, 32 bits, stereo
Ls         = GetChhanel(LRm_reverb, 1)               # Get left audio channel from audio signal LRm_reverb, 32 bits, stereo
Ls         = ConvertToMono(Ls)                       # Convert audio signal Ls, 32 bits, mono
Ls         = ConvertAudioTo24bit(Ls)		     # Resolution Ls 24 bits, mono
Rs         = GetChhanel(LRm_reverb, 2)               # Get right audio channel from audio signal LRm_reverb, 32 bits, stereo
Rs         = ConvertToMono(Rs)                       # Convert audio signal Rs, 32 bits, mono
Rs         = ConvertAudioTo24bit(Rs)		     # Resolution Rs 24 bits, mono


# Front channels
#
LfRf       = MixAudio(LfRf, LRm_reverb, 1.0, -1.0)   # LfRf = LfRf - LRm_reverb, 32 bits, stereo 
Lf         = GetChhanel(LfRf, 1)                     # Get left audio channel from audio signal LfRf, 32 bits, stereo
Lf         = ConvertToMono(Lf)                       # Convert audio signal Lf, 32 bits, mono
Lf         = ConvertAudioTo24bit(Lf)		     # Resolution Lf 24 bits, mono
Rf         = GetChhanel(LfRf, 2)                     # Get right audio channel from audio signal LfRf, 32 bits, stereo
Rf         = ConvertToMono(Rf)                       # Convert audio signal Rf, 32 bits, mono
Rf         = ConvertAudioTo24bit(Rf)		     # Resolution Rf 24 bits, mono


# Output audio clip 5.1
#
Sound51    = MergeChannels(Lf, Rf, C, LFE, Ls, Rs)   # 5.1 audio clip LPCM, MLP, 24 bits





# In case of standard coefficients of Downmix matrix from the channels Lf, Rf, C, LFE, Ls, Rs received here,
# initial stereo signal shall be recovered with a margin error less than 1%, and 
# this 1% percent has nothing in common with non-linear distortions, and 
# represents only crosstalk attenuations between channels (in the terms DIN 45500).

.