Other hardware: Difference between revisions

Revision as of 17:14, 4 July 2006

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Advanced Audio Distribution Profile (A2DP)

Supports the codecs: Sub Band Codec (SBC)

Optionally supports: MPEG-1,2 Audio, MPEG-2,4 AAC and ATRAC,

With the bitrate limited by the bluetooth link

Sampling Frequency - 16000, 32000, 44100, 48000 (some are optional, see references)
Channel Mode - mono, dual channel, stereo, joint stereo

The bitrate used for CD quality audio is 229 kbps and 328 kbps for middle and high quality, respectively.

Terminology used for comparing headphones

Impedance - Doesn't mean much by itself, but in general, impedence should be matched across a system.

SPL@1kHz, 1V rms - How "loud" the unit is at 1 volt input (rms not peak-to-peak).

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 *[http://www.hydrogenaudio.org/forums/index.php?showtopic=32634 forums]
 *[http://en.wikipedia.org/wiki/A2DP#Bluetooth_profiles wikipedia]
+Supports the codecs: Sub Band Codec (SBC)
+Optionally supports: MPEG-1,2 Audio, MPEG-2,4 AAC and ATRAC,
+With the bitrate limited by the bluetooth link
+=== Sub Band Codec ===
+* Sampling Frequency - 16000, 32000, 44100, 48000 (some are optional, see references)
+* Channel Mode - mono, dual channel, stereo, joint stereo
+The bitrate used for CD quality audio is 229 kbps and 328 kbps for middle and high quality, respectively.
+Reference: [https://www.bluetooth.org/foundry/adopters/document/A2DP_Spec_V1_0/en/ BLUETOOTH Advanced Audio Distribution Profile 1.0]
+== Headphones ==
+Terminology used for comparing headphones
+* Frequency response - The range of frequencies the headphones can reproduce
+* Impedance - Doesn't mean much by itself, but in general, impedence should be matched across a system.
+* SPL@1kHz, 1V rms - How "loud" the unit is at 1 volt input (rms not peak-to-peak).
+* Neodymium - The magnet of choice for high end headphones.