Tag Archives: audio

ALSA Sound Card Order

The default soundcard to be used with ALSA is that with the index 0 in /proc/asound/cards. Usually this is the first found sound device. If you want to change this order, you have to find out the name of the kernel module used for that card and then add the desired index to it in… Read More »

NYPD Siren Sounds

A nice collection of all available siren sounds in a NYPD police car can be found at the NY Times. The “Air Horn” sound going through a horn loudspeaker should give the typical horn sound of ambulances.

Rip YouTube videos/audio

The tools you need are described on blog.joff3.com. There’s also the nice youtube-dl package. One thing I noticed: the ffmpeg command there re-encodes the audio which might loose some quality. To just dump the audio off the Flash video, use: This is for 240px videos. All larger ones use AAC format. Use this: If you… Read More »

Audio Bitrates

I recently found this table which lists different audio formats and the bitrates where you’d reach similar quality.

festival Text-To-Speech

Simultaneous playback The festival text-to-speech synthesizer seems to use normal ALSA playback instead of PulseAudio. This leads to it failing when there’s already something playing. E.g. if you’re listening to music with Rhythmbox, festival fails with this message: To make it use PulseAudio, we can re-route the audio through the pacat utility as proposed on… Read More »

Music Player Daemon

Instead of playing music through usual audio players, there is the possibility of using the mpd – a daemon which runs in the background and plays music. The great advantage is: You can choose between various interfaces and always control the same player with the same playlist(s) – even via TCP/IP from another PC or… Read More »

Rip CD Track

The default tool for CD ripping under Gnome is Sound Juicer, found under Applications → Sound & Video → Audio CD Extractor. But this tool had severe problems recognizing my custom configuration for LAME encoding (I changed vbr-quality from 6 to 2 but the tool ignored it) also you had to restart it for every… Read More »

NASA Roger Beep

The “Roger” beep after transmissions from Space missions is @ 2475 Hz for 250 ms. According to everything2, there should be a pre-transmission tone @ 2525 Hz for 250 ms. They are called Quindar tones.