View source for Audio hardware

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These are ideas related to both audio input and output. Please review the [[hardware specification]] to see what is already included. Some audio-related ideas are also dealt with in the [[Radio and Broadcast]] page.

== Microphone ==

A built in Microphone would be usefully if dirt and echo/feedback could be controlled. If you have a microphone and speakers included with these laptops then then if you include a small peice of software they can be used  as telephones or walkitalkies -- like an instant message local channel that is as easy to use as a CB radio. If the hardware looked like a radio, the oporator could use it before they learend how to use the computer.

===Sound Codec===

The [Hardware specification]] page says the Audio Codec is an  [http://www.analog.com/en/prod/0%2C2877%2CAD1888%2C00.html Analog Devices AD1888], AC97-compatible audio codec.


The paper - 'The One Laptop per Child (OLPC) Audio Subystem' by Jaya (Alsa) provides useful information on the audio subsystem. The link is - 
[www.kgw.tu-berlin.de/~lac2007/papers/lac07_kumar.pdf The OLPC Audio Subsystem]

===Microphone Sensor Input===

The microphone input can be used to measure voltage  or (using the Microphone bias voltage) resistance. This should enable us to use this as a form of sensor input with the audio analog to digital converter converting the sensor signal to a signal that can be displayed on the screen or logged by the computer. More info is required on the use of the codec in this mode.
* max voltage that can be withstood safely by the mic input
* Voltage corresponding to AD converter full scale.
* Bias voltage output (open circuit)
* Bias voltage output (short circuit)
* anything else?

=== Microphone data input ===

The microphone input jack can double as a dataport for some class of devices (when supporting a "DC-coupled" input mode), but a more general-purpose [[USB peripherals|USB analog to digital]] device would be a great peripheral for the laptop. --[[User:Walter|Walter]]

[[Category:Hardware]]
[[Category:Hardware ideas]]
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