Airlogic ABM-200 Application Note - page 5
Bluetooth™ Module Application Note
Copyright © 2004 AirLogic Co., Ltd.
All specification are preliminary and AirLogic reserves the right to change these without notice.
http://www.airlogic.co.kr
11. PCM Interface
Pulse Code Modulation(PCM) is a standard method used to digitize human voice
patterns for transmission over digital communication channels. Through its PCM
interface, ABM-200-1xxx has hardware support for continual transmission reception of
PCM data, thus reducing processor overhead for wireless application. ABM-200-1xxx
offers a bi-directional digital audio interface that routes directly into the baseband layer
of the Module firmware. It does not pass through the HCI protocol layer.
Hardware on ABM-200-1xxx allows the data to be sent to the received from a SCO
connection.
ABM-200-1xxx can be configured as PCM interface Master generating an output clock
of 128, 256, or 512kHz. When configured as PCM interface slave it can operated with
input clock up to 2048kHz. ABM-200-1xxx is compatible with a variety of clock
formats, including Long Frame Sync, Sort Frame and GCI timing environments.
It supports 13-bit or 16-bit liner, 8-bit u-law or A-law companied sample formats at 8k
samples/s and can receive and transmit on any selection of the first four slots following
PCM_SYNC.