SAMPLING FREQUENCY
When the distribution begins, you may encounter such a phenomenon that
“the video and audio change gradually, although at first it is not so much.”
One of the causes is: -There is also a
error when setting the sample rate of the audio signal
.
If you are experiencing sound drift, you may want to review your settings.
Note:
What I’m talking about in this article is something I don’t understand, and although I mentioned “countermeasures” at the bottom for now, I really don’t understand the cause.
Still, I think the “countermeasure” described here will lead to an improvement for those who have problems with sound deviation, so I’ll post it.
(The author has made a clear improvement on the sound gap.)
Maybe there is an error in the article about the way of thinking, understanding, etc. note that.
What is sample rate and bit depth?
Sample rate is like a unit used when recording and playing back audio digitally,
y represents how much audio is sampled (sampled) per second.
It seems that Hz (hertz) is often used as a unit.
Bit depth is the number of bits by which a sample is represented and is expressed as either 16 bits or 24 bits.
It is used in the form of how many stages the difference in the sound that can be recorded is divided from the silent state to the maximum volume state, and the higher the bit depth, the more delicately the sound can be recorded and reproduced. . .
The minimum unit
of the vertical axis of the sound waveform (the one seen in voice editing software) is
the smallest unit of
horizontal axis of bit depth, which is determined by the sample rate.
When it comes to audio digitally, the two are often written as a set.
For example:
CD: 16bit 44.1kHz
DVD: 24bit 48kHz
A notation like 44100 Hz 16 bits appears even in the audio interface settings.
The values that can be set and the sound quality that can be handled differ for each audio interface.
Why does sound change due to sample rate setting error?
I can’t explain this area well.
When I was afraid of the sound gap, I searched for various information and looked at it,
but I couldn’t find anything like a good explanation.
Even if you look at the site that has information on measures against sound deviation, it says that if there is a hint of one or two lines
and continuous deviation of the sound, you should check if the sample rate is misaligned
. my environment, but…
in my environment
By the way, in my environment, when I rewatch the recording when the distribution sound was out of sync, there was a symptom that the
audio played a bit earlier (recording time axis was a bit shorter)
. .. It was a subtle speed boost that I’d miss until someone told me, but it was certainly fast.
The range of sample rate settings that VirtualAudioCable itself can handle was quite wide (checked in the dedicated settings app), so if I wasn’t careful, before I knew it
(default?), the “default format” was set to 48kHz in windows settings. What I was doing was a blind spot.
The sample rate was fixed on the Windows side.
After fixing this, continuous sound space during distribution was improved.
How to set the sample rate
Sampling Rate Adjustment Concept
The sample rate should be the same as much as possible.
Since distribution software and mixing software handle multiple inputs, they (should) convert such differences, but still the sound quality deteriorates each time the sample rate is converted.
This time, it appears that there is a sound gap involved.
We will try to unify the sample rate settings here as much as possible for those used during distribution.
I think it is better to unify at 44.1 kHz or 48 kHz.
