Difference between revisions of "Other hardware"
From Hydrogenaudio Knowledgebase
(bluetooth a2dp) |
(Headphones, A2DP) |
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*[http://www.hydrogenaudio.org/forums/index.php?showtopic=32634 forums] | *[http://www.hydrogenaudio.org/forums/index.php?showtopic=32634 forums] | ||
*[http://en.wikipedia.org/wiki/A2DP#Bluetooth_profiles wikipedia] | *[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. |
Revision as of 17:14, 4 July 2006
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Bluetooth (A2DP)
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
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: 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.