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作者d61s
這些是「提升音質」的技術嗎，記得不是耶，
藍牙就是單純傳輸數位訊號而已
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http://theheadphonelist.com/wireles...one-technology/
如果沒理解錯誤的話，
HSP 單聲道。
A2DP 立體聲。使用 SBC (Subband Coding) codec。像 mp3 壓縮一樣有不同的壓縮品質。
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A generic USB Bluetooth transmitter I picked up for $3 from eBay sounded absolutely atrocious because it defaulted to the lowest SBC quality, but installing a brand-name one with a CSR chipset in its place had excellent results.
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AptX 不是 profile, 是像 SBC 的 audio codec，號稱更接質 CD 音質。
要發射端與接受端都有支援才有用。
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aptX is designed to encode a CD-quality (16-bit / 44.1kHz) audio stream without loss of sound quality through a combination of slightly higher data transfer rate compared to SBC as well as more efficient audio encoding.
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我的 Z3C 規格就有標 Bluetooth® stereo (aptX®, A2DP)。
害我一直以為 aptX 也是一種 bluetooth profiles。