| ID | Category [?] | Severity [?] | Reproducibility | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 06805 | Sound | Minor | Always | Dec 26, 2017, 23:10 | Dec 28, 2017, 16:50 |
| Tester | wuemura | View Status | Public | Platform | MAME (Official Binary) |
| Assigned To | Resolution | Open | OS | Windows 10 (64-bit) | |
| Status [?] | Confirmed | Driver | |||
| Version | 0.192 | Fixed in Version | Build | 64-bit | |
| Fixed in Git Commit | Github Pull Request # | ||||
| Summary | 06805: narc, narc2, narc3: Annoying high pitch sound | ||||
| Description |
Soon after the screen and sound test a high 15 Khz ~ 16 Khz pitch, very sharp beep start to play throughout the game. It looks like one of the channels are out of phase, if you move you head this sharp beep start and stops. The beep vanishes after you quit the emulation. |
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| Steps To Reproduce | |||||
| Additional Information | |||||
| Github Commit | |||||
| Flags | |||||
| Regression Version | |||||
| Affected Sets / Systems | narc, narc2, narc3 | ||||
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Attached Files
|
 20171226_myProject_214341.png (143,616 bytes) Dec 26, 2017, 23:45 Uploaded by wuemura | ||||
| harmonics.png (21,855 bytes) Dec 28, 2017, 12:29 Uploaded by wuemura | |||||
| harmonics2.png (178,823 bytes) Dec 28, 2017, 12:29 Uploaded by wuemura | |||||
 AUDIO.zip (75,870 bytes) Dec 28, 2017, 12:31 Uploaded by wuemura | |||||
 No.14570
vidpro1 Developer
Dec 27, 2017, 04:54
edited on: Dec 27, 2017, 21:39
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If I do recall I believe this is the CVSD channel doing this. Harris 55536. Update: If you crank up the CVSD volume the noise is there you might need to turn up all the DACS and Yamaha as well. |
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 No.14574
Tafoid Administrator
Dec 27, 2017, 08:32
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I don't hear it in 0.192 or current GIT. It could be my cheap headphones and speakers lack the range or I'm just not able to detect that high of a range. Have you experienced versions of MAME where this didn't happen? |
 No.14576
wuemura Viewer
Dec 27, 2017, 10:09
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I've tested with 0.192 and mame0192-771-ge473764e04-dirty, happens on both. Version 0.140 doesn't have this issue, I could pin point to version 0.145 but it could be earlier since I can't download other versions right now. That tone is very sharp and loud, tested with a Sony KDL-47W802A that I use as a monitor, Sennheiser HD 800S headphone and a Onkyo HT-S5600. |
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No.14582
Haze Senior Tester
Dec 28, 2017, 03:18
edited on: Dec 28, 2017, 03:22
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It's entirely possible the real game does this, and the speakers the cab shipped with weren't good enough to reproduce it. even with a decent speaker setup here, I can't hear it tho. there is a very visible DC offset if I look at the output of -wavwrite before coining up however |
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No.14583
vidpro1 Developer
Dec 28, 2017, 03:28
edited on: Dec 28, 2017, 03:28
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I think quite a number of the games in MAME that use a lot of channels and chips have this problem like Exidy Mouse Trap. I have narrowed it down to the CVSD. If you turn down the volume versus other chips it goes away. |
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No.14584
wuemura Viewer
Dec 28, 2017, 12:33
edited on: Dec 28, 2017, 12:35
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Looks like a bunch of odd harmonics. About the DC Offset, are 9369 on both sides. Analyzing...
Gain | Peak | Scale | New Peak |Left DC|Right DC| Track
| | | |Offset | Offset |
--------------------------------------------------------------
+5.26 dB | 16384 | 1.83 | 30020 | 9369 | 9369 | AUDIO.wav |
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No.14585
vidpro1 Developer
Dec 28, 2017, 16:50
edited on: Dec 28, 2017, 16:50
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Most games I have seen with the CVSD have the hissing problem if there are more than three sound devices. Exidy Mouse Trap PC Speaker chip but has three channels at one plus noise generator and CVSD chip. Narc's sound board has the following * music: 6809 driving YM2151, DAC * effects: 6809 driving CVSD, DAC The other Williams Games only have (Trog, Smash TV etc) - No audio hiss * music&effects : 6809 driving YM2151, DAC, CVSD |