Vinyl control Issue, pitch stability
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
Mixxx |
Triaged
|
Medium
|
Owen Williams | ||
1.10 |
Won't Fix
|
Medium
|
Owen Williams | ||
1.11 |
Won't Fix
|
Undecided
|
Unassigned | ||
2.0 |
Won't Fix
|
Undecided
|
Unassigned | ||
2.1 |
Won't Fix
|
Undecided
|
Unassigned | ||
2.3 |
Won't Fix
|
Medium
|
Owen Williams |
Bug Description
The vynil control feature of mixx works quite well at first sight, but using this feature in a real mix or just when listening to songs with lyrics reveals that there's a problem with the vynil control.
The resulting playback pitch, when using vynil control feature, seems to variate (slightly & quickly) sometimes.
I've made the following test setup :
I've generated a wav file, 44100Hz, 16 bits, with a 1KHz genrated sine wave inside.
I've used this track in mixx as current track, playing it with the vynil control feature.
I've recorded mixxx playback with the record feature.
The resulting playback shows that the pitch is not constant (hearable 1KHz tone variations).
I've recorded the signal from the Serato vynil I'm using.
This recording shows that the turntable (SL1200 MKII) is stable, (straight 1KHz)
Recordings of the input vynil & the played sine wave with mixx are in the attached archive.
All the resulting files have been analysed with a spectrum analyser (see jpg files), in order to show the cleanliness of the vynil input sine and the "ugliness" of the output of the played sine wav file with mixx.
Note : The horizontal scale is in Hertz, and the vertical scale (not shown) is time.
Setup :
Pentium-M 1.5GHz / 512 MB RAM (30-45% CPU used by mixxx, 300MB of free RAM)
WinXP SP3
Dedicated laptop to mixxx (no evil resident programs, lightweight windows...)
Beringher UCA202 USB sound card
Tests have been conducted with ASIO4ALL (v2.10) driver AND windows Driver, results are same.
Serato Scratch Live vynils, CV02
Regards,
David
summary: |
- Vynil control Issue, pitch stability + Vinyl control Issue, pitch stability |
Changed in mixxx: | |
milestone: | 1.10.0 → 1.10.1 |
Changed in mixxx: | |
status: | New → Triaged |
milestone: | 1.10.1 → none |
What version of Mixxx are you using?