
PSB 7280
Semiconductor Group
153
Data Sheet 1998-07-01
4. Set Options
I
x
x
P1
P0
L2
L1
L0
x
S
Re1 Re0 Rd1 Rd0
e
d
d
decoding mute enable (1) and disable (0). After switching, a ramping function
is implemented to avoid audible clicks
encoding mute enable (1) and disable (0). After switching, a ramping function
is implemented to avoid audible clicks
Restricted number of bits for encode and decode. Only used for G.722, that
offers modes where less than 8 bits per byte are used: 7 bits per byte
(56 kbit/s) and 6 bits per byte (48 kbit/s).
00
8 valid bits per byte
01
7 valid bits per byte
10
6 valid bits per byte
11
Reserved
Sampling Rate of the codec connected to the JADE, either 8 kHz (0) or
16 kHz (1). If the sampling rate of the codec is different from the sampling
rate expected by the selected speech coder, the JADE automatically uses
over-/undersampling filters to convert the audio data.
When using G.728 mode and S=1 indicating a 16-kHz codec is connected,
the postfilter of G.728 is switched off to ensure the computational power for
the over-/undersampling filters is available. The effect on the audio quality is
negligible.
When using G.722 mode and S=0 indicating an 8-kHz codec is connected,
the bandwidth of the G.722 input/output data is reduced to 3.4 kHz.
Nevertheless, the compressed data stream is fully compatible and
interoperable with the G.722 standard.
e
Re(1-0),
Rd(1-0)
S