Difference between revisions of "Other hardware"
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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 == | ||
+ | Some Styles (smallest to largest) | ||
+ | * In the ear - outputs directly into the ear canal | ||
+ | * Earbuds - sits in the outer ear | ||
+ | * Supra-aural - sits on the ear | ||
+ | * circumaural - completely cover the ear | ||
+ | |||
+ | Terminology used for comparing headphones | ||
+ | * Noise Cancelling | ||
+ | ** active | ||
+ | ** passive | ||
+ | |||
+ | * 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 - [http://en.wikipedia.org/wiki/Sound_pressure_level#SPL_in_audio_equipment Sound Pressure Level]. How efficient the unit converts electrical energy to sound energy. | ||
+ | |||
+ | * Neodymium - The magnet of choice for high end headphones. | ||
+ | Popular Headphones | ||
+ | * Sub $30 | ||
+ | * Sub $100 | ||
+ | * $100 - $300 | ||
+ | * $300+ |
Revision as of 05:49, 5 July 2006
This article is a stub. You can help the Hydrogenaudio Knowledgebase by expanding it.
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
Some Styles (smallest to largest)
- In the ear - outputs directly into the ear canal
- Earbuds - sits in the outer ear
- Supra-aural - sits on the ear
- circumaural - completely cover the ear
Terminology used for comparing headphones
- Noise Cancelling
- active
- passive
- 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 - Sound Pressure Level. How efficient the unit converts electrical energy to sound energy.
- Neodymium - The magnet of choice for high end headphones.
Popular Headphones
- Sub $30
- Sub $100
- $100 - $300
- $300+