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製品Q&A > 【ENGLISH ver.】 > ・Bluetooth Speker
文書番号:6114
Q.【Bluetooth Headphone】【Bluetooth Speaker】What is AAC/aptX?
 
AAC/aptX are types of audio codec compression algorithms
used when transferring sound via Bluetooth in high quality
Codec - computer program to encode/decode a signal)

Please see below for more detailed explanations.

When both of your base unit and Bluetooth headphone support A2DP(audio distribution profile)
you can play music wirelessly.
Please see the links below for the compatibility.
→ Supported Smartphone
→ Supported Smartphone (Search from the Product)


 When Bluetooth headphone and smartphone are paired via A2DP
     you can listen to the music that is played on your smartphone from your headphone.

Pairing Completed





 When the music data is being transferred from your smartphone to your headphone
     it is compressed because the data is too big to send via a Bluetooth signal.

It's a Bluetooth connection,
I need to compress!
Music data is coming!
I will extract to play!

Compressing and
transferring,
and deleting
the unhearable sound!



Major compression (codec) types are - SBC/AAC/aptX
※Please see below for the details.

Codec Descriptions Note
SBC

(SubBand Codec)
Lag occurs when compressing data to transfer
therefore sound comes late.
Because it deletes a high tone range,
played sound is of low quality.
Noise occurs when no music is played.
Yet, it is the default codec and
its implementation is mandatory for A2DP profile so
available for many Bluetooth devices
A2DP profile default codec.
All the A2DP supported Bluetooth
devices have SBC.
Therefore it is available for many devices.
When the devices don't have any other
common codec data is automatically
compressed with SBC.
AAC

(Advanced Audio Coding)
Same compression ratio as SBC.
Very little lag occurs.
High tone range is not deleted
and sound of higher quality.
Mainly used on iPhone

Ex: ELECOM
LBT-AVHP300NC series etc.
aptX
Much less compression ratio than SBC.
Sound of very high quality.
Very little lag occurs.
Can be used with videos without problems.
Mainly used on Android

Ex: ELECOM
LBT-AVHP300NC series etc.




When you wish to use codec types above,

 ・「Base unit」
 ・「Headphone」

please check both of them supports the codec type.


<See Also - List>

Bluetooth
Device →

↓Base unit
 
 ↓Supported codec
SBC SBC
AAC
SBC
AAC
aptX
   SBC SBC SBC SBC
SBC
AAC
SBC AAC AAC
SBC
AAC
aptX
SBC AAC aptX
 SBC
aptX
 SBC SBC   aptX



The highest quality codec type out of ones that both devices are supported
will be automatically chosen.



作成日時:2014-11-13
更新日時:2014-11-21

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