PSB7238 SIEMENS [Siemens Semiconductor Group], PSB7238 Datasheet - Page 145

• Manufacturer Part Number: PSB7238
• Description: Joint Audio Decoder-Encoder - Multimode
• Manufacturer: SIEMENS [Siemens Semiconductor Group]

G.723 Mode
G.723, 6.3 Kbit/s
G.723, 5.3 Kbit/s
G.723, Silence
Insertion Descriptor
(SID) packets
G.723,
untransmitted
packets
Note: Independently of the interface selection for the compressed audio, always the
6.2.1.3
The following paragraph describes an H.221/H.223 oriented protocol which transfers the
control information inband with the compressed audio data.
The user sends commands and data, and the provider sends status and data.
Commands and data or status and data are grouped into blocks of 16-bit words.
Between the user and the JADE one data packet is transferred each way every 10 ms.
The packet, that is transferred from the video processor to the JADE - called “command
data” - consists of eight command words followed by the appropriate number of data
words for the current speech algorithm:
Semiconductor Group
most significant bit of the most significant byte is transferred first, e.g. when using
pass-through modes, the 16-bit samples are split up into two bytes and the most
significant bit of the most significant byte is transferred first (big endian).
Compressed Audio Protocol with Inband Control
Supported in ITU-T
C-Code Version:
4.1, 5.0, 5.1
4.1, 5.0, 5.1
5.0, 5.1
5.0, 5.1
145
Bit (1-0) of first
Byte
01
10
11
00
Comment
standard packet
5.3 Kbit/s Mode
standard packet
Silence packet with
filter coefficients,
same for 6.3 and
5.3 Kbit/s mode
Silence packet
without any data,
same for 6.3 and
5.3 Kbit/s mode
6.3 Kbit/s Mode
Data Sheet 1998-07-01
Firmware Features
PSB 7238