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Beste Menschen,
Ik zit zo als altijd 3/4 van mijn tijd achter een pc tijdens het werken. En dan kom je nog wel het een en ander tegen. Ik heb een DVD hier voor de geïnteresseerde liggen. interesse = mailen!
reactie's altijd welkom.
Is dit iets en kunnen we er wat mee? That's the question
Ik zit zo als altijd 3/4 van mijn tijd achter een pc tijdens het werken. En dan kom je nog wel het een en ander tegen. Ik heb een DVD hier voor de geïnteresseerde liggen. interesse = mailen!
reactie's altijd welkom.
INFO
Technical Info Tracks 1 to 8 :
Track 1 :
I have first up-sampled the CD source from 44.1kHz to 48kHz because a DVD only supports 48kHz sample rate for stereo audio tracks.
The sampling rate conversion is done using Sound Forge 9.0 with interpolation setting 4 and Anti Aliasing. This will result in a maximum quality.
This track 1 is than used as a reference and used as a source for all other tracks.
Track 2 :
This track is converted to 2.0DD (AC3) using Aften 4.1.
The bitrate is 320kbps which will result in an almost identical waveform of the source.
Also the spectrum goes up to 20kHz.
Track 3 :
Same as Track 2 but then the bitrate is 192kbps.
The waveform is almost identical but the frequency response (spectrum) is clearly cut-off from about 18kHz.
Track 4 :
The 192kbps conversion is done using the default SF9.0 AC3 plug-in.
192kbps is the only available bitrate for stereo materials (5.1DD is 448kbps).
The waveform is almost identical but the frequency response (spectrum) is clearly cut-off from about 17kHz.
For tracks 2 to 4 the AC3 track is converted back to a WAV file using Foobar2000.
This will exclude differences caused by a "bad" AC3 converter inside any A/V-Receiver.
Track 5 :
This track is down-converted to 44.1kHz and than back to 48kHz using SF9.0.
In fact these 2 conversion will add each time slight losses.
With a 5.1DD to DTS-CD you will only have one conversion.
Track 6 to 8 :
These are in fact the AC3 tracks of Track 2 to 4 but not converted back to WAV.
Personal Listening Results :
I can not hear any differences between tracks 1 to 5.
I can switch almost seamless and even than it is not possible to hear differences.
Blind testing will obviously result in NO differences at all.
Tracks 6 to 8 sounds louder on my TX-NR807 receiver compared to track 1 but the sound it self is still very clear and identical.
Technical Info Tracks 1 to 8 :
Track 1 :
I have first up-sampled the CD source from 44.1kHz to 48kHz because a DVD only supports 48kHz sample rate for stereo audio tracks.
The sampling rate conversion is done using Sound Forge 9.0 with interpolation setting 4 and Anti Aliasing. This will result in a maximum quality.
This track 1 is than used as a reference and used as a source for all other tracks.
Track 2 :
This track is converted to 2.0DD (AC3) using Aften 4.1.
The bitrate is 320kbps which will result in an almost identical waveform of the source.
Also the spectrum goes up to 20kHz.
Track 3 :
Same as Track 2 but then the bitrate is 192kbps.
The waveform is almost identical but the frequency response (spectrum) is clearly cut-off from about 18kHz.
Track 4 :
The 192kbps conversion is done using the default SF9.0 AC3 plug-in.
192kbps is the only available bitrate for stereo materials (5.1DD is 448kbps).
The waveform is almost identical but the frequency response (spectrum) is clearly cut-off from about 17kHz.
For tracks 2 to 4 the AC3 track is converted back to a WAV file using Foobar2000.
This will exclude differences caused by a "bad" AC3 converter inside any A/V-Receiver.
Track 5 :
This track is down-converted to 44.1kHz and than back to 48kHz using SF9.0.
In fact these 2 conversion will add each time slight losses.
With a 5.1DD to DTS-CD you will only have one conversion.
Track 6 to 8 :
These are in fact the AC3 tracks of Track 2 to 4 but not converted back to WAV.
Personal Listening Results :
I can not hear any differences between tracks 1 to 5.
I can switch almost seamless and even than it is not possible to hear differences.
Blind testing will obviously result in NO differences at all.
Tracks 6 to 8 sounds louder on my TX-NR807 receiver compared to track 1 but the sound it self is still very clear and identical.
Is dit iets en kunnen we er wat mee? That's the question
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