5replies
spectrum analyzer shows flat line nothing moving
A flat spectrum means the browser is not receiving audio. Allow microphone access for the site, pick the right input in the browser and check the…
Harvey Finch
Spectrum Analyzer Lead at Sound Test
Harvey Finch is the Spectrum Analyzer Lead on the Sound Tester Audio Team. Audits real-time fast Fourier transform (FFT) spectrum mapping and audio visualizer rendering accuracy.
Harvey Finch is the Spectrum Analyzer Lead on the Sound Tester Audio Team. Audits real-time fast Fourier transform (FFT) spectrum mapping and audio visualizer rendering accuracy. Contributes open-source digital signal processing tips on GitHub. On Sound Tester he answers Spectrum Analyzer questions, including flat displays, permissions and reading peaks, and reviews how each result is drawn.
- Experience
- 9+ years
- Answers On Sound Test
- 10
What Harvey Works On
FFT analysisspectrum accuracyaudio visualizers
Sound Tester Tools Harvey Looks After
Spectrum AnalyzerSee any sound split into its frequencies liveFree · Open tool Mic TestCheck your microphone input with a live level meterFree · Open tool
Discussions Answered By Harvey
3replies
wired earbuds mic not working on iphone with lightning adapter
If sound plays but the mic fails, the adapter or plug type may not carry the mic. Check the adapter supports a 4-pole TRRS plug and clean the…
2replies
mic works in discord but not in my game
If Discord hears you but the game does not, the game is using a different input device. Set the same mic in the game and allow microphone access.
3replies
discord stream audio crackling for my friends
Crackle for viewers usually comes from CPU load or sample-rate mismatch. Match all devices to 48 kHz, lower the stream quality and update Discord.
2replies
mic test says permission denied on iphone
If the iPhone stopped asking for microphone access, the site was blocked once. Open Settings, Safari, Microphone, set it to Ask or Allow and reload…
3replies
browser never asks permission to use mic
If the browser never shows the popup, the site is blocked. Click the lock icon, set Microphone to Allow and reload.
4replies
laptop sound gone every time it wakes from sleep
After sleep, the audio service or driver can fail to restart. Restarting Windows Audio fixes it for now, and disabling fast startup or updating the…
2replies
spectrum analyzer shows nothing on safari
Safari needs microphone permission for the site and sometimes a click to start audio. Check Settings, Websites, Microphone.
2replies
phone mic not working on whatsapp calls
If only WhatsApp has no mic, the app permission is off. Allow the microphone in app settings and clear cache.
2replies
headset mic keeps muting itself
Self-muting is often caused by an inline mute switch, an app option or exclusive control. Check the cable switch and the app settings.
The Audio Team Behind These Answers
Brandon VanceAudio & Acoustic Performance Lead
Xavier CruzFrequency Sweep Specialist
Diana ChenHearing Test Architect
Alistair CrossHeadphone Benchmark Lead
Imogen BlakeBinaural Beats Engineer
Callum SterlingSurround Sound Auditor
Gemma GallagherTone Generator Validator
Rishabh SharmaAudio DSP EngineerEach answer is written by the specialist closest to the topic and checked by a second team member. How we verify answers