08598: ibm5150 and clones [satane,satanc]: High-pitched noise from speaker after playing sampled sounds

ID	Category [?]	Severity [?]	Reproducibility	Date Submitted	Last Update
08598	Sound	Minor	Always	Apr 6, 2023, 19:38	May 24, 2023, 09:57

Tester	ICEknight	View Status	Public	Platform	MAME (Official Binary)
Assigned To		Resolution	Open	OS	Windows 10/11 (64-bit)
Status [?]	Acknowledged			Driver	pc/ibmpc.cpp
Version	0.253	Fixed in Version		Build	64-bit
		Fixed in Git Commit		Github Pull Request #

Summary	08598: ibm5150 and clones [satane,satanc]: High-pitched noise from speaker after playing sampled sounds
Description	After any of the game's sampled sound effects finish playing, a faint, high-pitched noise will be constantly heard in the background. Might be a BTANB or lack of a needed filter, couldn't find real hardware references and some videos don't have any background noise while some do.
Steps To Reproduce	-Load the pc driver with satanc (you can also load pcega with satane but it will play much slower). -Press 1 when prompted and wait for a bit. -Once in the main menu, press 2 to redefine keys. A sound will play and the background noise will start (raise your speakers volume if it's not heard).
Additional Information	Seems to happen on all PC-based drivers, like pc/ibmpc.cpp and pc/ct486.cpp.
Github Commit

Flags
Regression Version
Affected Sets / Systems	ibm5150 and clones [satane,satanc]

Attached Files	satanc.mp3 (446,510 bytes) May 21, 2023, 02:33 Uploaded by ICEknight

No.21319 Robbbert Senior Tester Apr 15, 2023, 11:52	There's problems with this report. pccga does not exist, assuming you mean pc Press 2 to redefine the keyboard, not 1. I can't hear any high-pitched noise, but then again my hearing is not the best.
No.21320 ICEknight Tester Apr 15, 2023, 13:45	You're right, just fixed those. The noise should be more evident after turning up the volume a bit higher than normal.
No.21452 Tafoid Administrator May 20, 2023, 21:40	I, too, used pcega to load it and got to where you remap inputs for the game and I didn't hear anything high pitched, just the sound/tone made when you select a key. Does it come up in a -wavwrite recording? Are you using DirectSound or one of the other options?
No.21453 ICEknight Tester May 21, 2023, 02:34	Just uploaded an MP3 with the sound I get. Using the "auto" sound option but it also happens with "directsound".
No.21456 Tafoid Administrator May 24, 2023, 09:57	Probably my ears being old and lack of good audio equipment - it must very high ranged since I can't casually hear it from your wavwrite either. I'll acknowledge until someone with better ears/equipment and look at this.