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SBC vs aptX | Difference between SBC and aptX codec Bluetooth

This page compares bluetooth codecs SBC vs aptX and mentions difference between SBC and aptX used in bluetooth profiles.

Introduction:
As we know bluetooth is a short range wireless technology which uses 2.4 GHz ISM band and covers range of about 10 to 100 meters. There are various bluetooth versions such as bluetooth classic, Bluetooth low energy and Bluetooth high speed.

Bluetooth supports various profiles based on its applications of usage. The profiles include Hands Free Profile (HFP), Headset Profile (HSP), A2DP, A/V Remote Control Profile (AVRCP), Phone Book Access Profile (PBAP) and Message Access Profile (MAP). These bluetooth profiles use various audio codecs such as aptX, SBC, mSBC and Advanced Audio Coding (AAC).

SBC audio codec

Following are the features of SBC bluetooth audio codec.
• It is short form of Sub Band Coding.
• It provides reasonably good audio quality at medium bit rates while keeping low computational complexity.
• It is the only mandatory codec used in A2DP profile specified by Bluetooth SIG.
• It is digital audio encoder and decoder.
• It is used to transfer data to bluetooth audio output devices such as headphones, speakers etc.
• SBC supports both mono and stereo streams.
• It uses sampling frequencies up to 48 kHz
• It supports bit rates upto 198 Kbps (mono stream) and upto 345 Kbps (stereo stream).
• It uses 4 sub bands or 8 sub bands. It uses adaptive bit allocation algorithm along with adaptive block PCM quantizers.
• It is used by A2DP profile version 1.3.

aptX audio codec

Following are the features of aptX bluetooth audio codec.
• It is developed by Qualcomm.
• It has higher quality compare to SBC audio codec.
• It is used in many android platforms such as samsung galaxy S-series, Apple OSX and so on.
• It is used for consumer as well as automotive wireless audio applications e.g. realtime audio streaming over bluetooth A2DP profile between source and sink devices.
• The aptX uses time domain ADPCM technique.



Previous versions of Bluetooth 5.0 or Bluetooth Low Energy (BLE) Related Links

Also refer bluetooth tutorial covering following sub topics:
Main Page  Frequency  PHY Layer  MAC layer  Stack  Power classes  Security  products  Bluetooth Vs BLE  Bluetooth vs zigbee   Bluetooth Vs WiFi vs NFC vs RFID  Difference between Bluetooth Versions 

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