PSB7238 SIEMENS [Siemens Semiconductor Group], PSB7238 Datasheet - Page 77

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

With Double Last Look
A change in received C/I is recognized after a new value is detected in two consecutive
frames.
This is shown in Figure 36.
Figure 36
Algorithm
“Current” is compared to “Previous”:
– If they are not equal, “Current” is loaded into “Previous”, and a new comparison is
– If they are equal, the new value takes the place of “Confirmed”. “Confirmed” is
If CIR register has been read, “Old Confirmed” is compared to CIR:
– If they are equal, no actions are taken.
– If they are not equal, “Old Confirmed” is copied to CIR and a CIC interrupt status is
Semiconductor Group
performed in the next frame. No further actions are taken.
compared to “Old Confirmed”:
If they are equal, no actions are taken.
If they are not equal, “Confirmed” is copied to “Old Confirmed”.
generated.
77
Data Sheet 1998-07-01
Functional Blocks
PSB 7238