| Summary: | BiquadFilterNode.getFrequencyReponse gives all 1's | ||||||||
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| Product: | WebKit | Reporter: | ae | ||||||
| Component: | Web Audio | Assignee: | Nobody <webkit-unassigned> | ||||||
| Status: | NEW --- | ||||||||
| Severity: | Normal | CC: | jer.noble, webkit-bug-importer | ||||||
| Priority: | P2 | Keywords: | InRadar | ||||||
| Version: | Safari 12 | ||||||||
| Hardware: | iPhone / iPad | ||||||||
| OS: | iOS 12 | ||||||||
| Attachments: |
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Description
ae
2018-12-05 12:19:29 PST
Created attachment 356639 [details]
Frequency response as returned by WebKit / iOS
Created attachment 356640 [details]
Frequency response as returned on Chrome (exactly same code / setup)
(the screenshots show a white noise source running through the "Spectral EQ" insert FX, which shows a spectrum analyser (AnalyserNode) and applies a single EQ with some gain and center frequency at 1500 Hz. The AnalyserNode is after the EQ. In Chrome, the frequency response curve (blue) as returned by FilterNode.getFrequencyResponse exactly corresponds to the observed spectrum. In WebKit, it is just flat (all 1s)). The EQ is a BiquadFilterNode of type 'peaking', frequency 1500, gain 20, and Q 1. Calling getFrequencyResponse on this filter gives a flat (all 1) response. Also, the phase response is all 0 (wrong too). |