From f15db26c073b336054cd2a14e559bd53248c3479 Mon Sep 17 00:00:00 2001 From: Joshua Boniface Date: Tue, 13 Mar 2018 01:30:15 -0400 Subject: [PATCH] Add more about the alsamixer gain values --- content/post/self-hosted-voice-control.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/content/post/self-hosted-voice-control.md b/content/post/self-hosted-voice-control.md index 1e30372..9e0e798 100644 --- a/content/post/self-hosted-voice-control.md +++ b/content/post/self-hosted-voice-control.md @@ -65,7 +65,7 @@ Once this finishes, you'll be booted into your Raspbian Stretch system complete ### ReSpeaker Audio -The [ReSpeaker library](https://github.com/respeaker/seeed-voicecard) provides the drivers and utilities for using the ReSpeaker hat with Raspbian. Note however that this library won't work on Raspbian Jessie, only Stretch, which is why we have to upgrade the Kalliope image first. Once the upgrade is finished, clone this repository into a local directory and follow the instructions provided. Verify that the driver is working by checking `arecord -L` and looking for ReSpeaker entries. +The [ReSpeaker library](https://github.com/respeaker/seeed-voicecard) provides the drivers and utilities for using the ReSpeaker hat with Raspbian. Note however that this library won't work on Raspbian Jessie, only Stretch, which is why we have to upgrade the Kalliope image first. Once the upgrade is finished, clone this repository into a local directory and follow the instructions provided. Verify that the driver is working by checking `arecord -L` and looking for ReSpeaker entries, then configure the volume of the microphones using `alsamixer`. I find that a gain of 90 with a volume of 75 makes a fantastic value, since 100/100 results in nothing but noise. Your mileage here may vary, so do some tweaking as recommended in the library README. One downside is, however, that the ReSpeaker technically supports directional audio (like, e.g. the Alexa, using the mic closest to you for optimal performance). At the moment though I don't have this support in this project, because I'm making use of PulseAudio to handle the incoming audio, rather than directly interfacing with the ReSpeaker unit - this support would have to be built into Kalliope. It does work, but you don't get the directional listening that you might expect from reading the ReSpeaker page!