View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0000124 | MMW v4 | Player | public | 2003-02-20 06:39 | 2006-11-07 17:11 |
| Reporter | rusty | Assigned To | |||
| Priority | urgent | Severity | tweak | Reproducibility | sometimes |
| Status | resolved | Resolution | open | ||
| Summary | 0000124: Equalizer: audio quality issues | ||||
| Description | I tested a random subset of the sliders with generated test tones and a spectrum analyzer to verify that they were in fact affecting the audio in the intended frequencies. I'm not sufficiently versed in audio engineering to give this '10', but from a layman's perspective, it works. What seemed strange was: 1) with the equalizer enabled, static could occasionaly be heard on some of the test tones. I did not observe this in listening to music, though (however, it much more difficult to discern this in music). 2) Pops/breaks in the music occur when: -The user moves a slider while music is playing -The equalizer dialog appears when the user clicks View-->Equalizer Note: these issues are probably related to the CPU utilization problem noted in bug #122 (when the user clicks View-->Equalizer, CPU utilization sometimes jumps to 70%, even if the equalizer isn't enabled! 3) The equalizer appears to 'overcorrect' at the boundary of a band. e.g. if all sliders are at -20db, volume for a sweeping 110-220hz tone is -15db. If the user adjusts the 156Hz slider to +20db, then once the tone passes ~190Hz the volume drops to -20db and then quickly rebounds to -15db. I'm not sure how bad this is for the end-user's listening experience, but it may be an issue. | ||||
| Additional Information | Tool for test tone generation and spectrum analysis: http://www.ymec.com/products/dssf3e/ | ||||
| Tags | No tags attached. | ||||
| Fixed in build | |||||
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I'm changing the severity of this to 'tweak'. In daily use, I have not noticed the occurence if issues 1) and 3) which did come up during the calibrated tests. |
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Fixed in build 1011. 2) Was fixed in a similar way tagging was, i.e. now there isn't any skip if a slider is moved (track is automatically restored to the position where it was before equalizer was applied). There is only a small skip when equalizer is fully enabled or disabled - it's caused by its internal math and can't be that easily fixed. |
