Re: Headset compatible with beaglebone audio cape?

[David Anders]

Brandon,

the audio cape from beageboardtoys.com/BoardZoo.com does not directly support the use of a microphone. the board is designed to provide a "line-in" also known as "line level" (http://en.wikipedia.org/wiki/Line_level).

What is mic level/line level/speaker level?

• Mic level is just what it sounds like, the level of audio signal that comes as a result of you talking into a microphone that is plugged into whatever it may be - no amplification at all.
• Line level refers to an audio signal that is stronger than mic levels and capable of driving power amplifiers, but weaker than a signal that can drive a speaker.  It can be measured in decibels volts (dBv) or decibels unloaded (dBu) in relation to a reference voltage.
• Speaker level is a signal that has already gone through the preamplification and amplification stage and can drive speakers.

Some common levels you’ll see:

• +4 dBu is “professional” line level, common in modern pro recording gear, and it is about 1.25 V.
• 0 dBv is an average line level, typical output from rackmount guitar/bass preamps.
• -10 dBu is “consumer” line level, common with older and cheaper recording gear.
• -20 dBu is roughly in the neighborhood of a typical instrument’s output.
• -30 dBu is again in the neighborhood of a typical microphone’s outp

thanks
Dave Anders


On Tuesday, May 28, 2013 7:17:07 PM UTC-5, brandon...@gmail.com wrote:

I have had a very difficult time getting microphones to work with the audio cape. I have found one dynamic radio shack mic that worked, but I've been through several small headset mics that do not work.   Is it pretty much mandatory to use a pre-amp with the audio cape? Anyone have luck without a pre-amp?

Furthermore, they claim the 3.5mm jacks are stereo but I don't think this is the case. I have to use stereo to mono adapters to get anything working at all.  Anyone know more about this?


All in all I'm starting to feel like I bought a poorly designed product (the cape, not the beaglebone)

[sns]

Have you succeeded in interfacing mic? If so, how?

[Zainab S.V]

Will USB headset with mic work for audio application that records sound and playback on beaglebone with quality?Here is there is no need for separate pre- amplifier or circuit that requires biasing mic voltage?

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