PSB7238 SIEMENS [Siemens Semiconductor Group], PSB7238 Datasheet - Page 150

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

Semiconductor Group
L(2-0)
P(1-0)
I
5. Set Volume
Adjusts the gain on the analog input and output. Realized by multiplying the encoder
samples with (EV(7-0) + 1)/256 and the decoder samples with (DV(7-0) + 1)/256, i.e. for
maximum volume, the samples are not affected and for minimum volume they are
divided by 256.
EV7 EV6 EV5 EV4 EV3 EV2 EV1 EV0 DV7 DV6 DV5 DV4 DV3 DV2 DV1 DV0
Loopback modes, used for testing the audio subsystem. The following loops
are implemented:
000
001
010
011
100
101
110
111
Part number of the data in this packet. Allows the natural period of the data
to be 10 to 40 ms. For G.723 takes on the values 0, 1 or 2 corresponding to
the first, second or third part of a 30 ms data packet. Is always 0 for the other
modes.
Note: When in G.723 mode, the user has to care that G.723 encoder and
Data is invalid. If I is set then the compressed data in this packet was missing
or had errors. The data words in this packet are still sent to avoid buffer
problems.
decoder are running synchronously, i.e. the part number of the
received and transmitted packet in one 10 ms frame must be identical
for control and status.
No loopback (default)
Send received compressed data back to the user as encode data
Encode the decoded user data
Reserved
Reserved
Decode the encoded audio input data
Send the digital ADC output to the DAC input
Reserved
150
Data Sheet 1998-07-01
Firmware Features
PSB 7238