13

Codec Performance

Fig.7 Typical Overall (Encoder + Decoder) Frequency Response

Fig.10 Typical Overall (Encoder + Decoder) Frequency Response

Frequency (kHz)

- 50

- 40

- 30

- 20

- 10

0

+ 10

Gain (dB)

- 60

01

2

3

4

5

6

0.2

Input 0dB Ref: = 308mVrms

Input Level

= -20dB

Sample Rates = 25 or 50kb/s

0dB

Frequency (kHz)

- 50

- 40

- 30

- 20

- 10

0

+ 10

Gain (dB)

- 60

01

2

3

4

5

6

Input 0dB Ref: = 308mVrms

Input Level

= -20dB

Sample Rates = 16, 32 or 63kb/s

0.2

0dB

Fig.8 SINAD vs Input Level at Differing Sample Rates

Fig.9 SINAD vs Input Level at Differing Frequencies

SINAD

(dB)

10

20

30

-30

-24

-18

-12

-6

0

Input Level (dB

64kb/s

50kb/s

32kb/s

25kb/s

Input Frequency = 1.0kHz

0dB Ref:

= 308mVrms

SINAD

(dB)

10

20

30

-30

-24

-18

-12

-6

0

Input Level (dB)

600Hz

1000Hz

1500Hz

Sample Rate = 32kb/s

0dB Ref:

= 308mVrms