MSM7620 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM7620

Echo Canceler

Oki Electric Industry 

¡ Semiconductor

MSM7620

ECHO CANCELER CHARACTERISTICS DIAGRAM

ERL vs. echo attenuation

40

RIN input level vs. echo attenuation

40

30

30

20

20

10

10

0

0

40 30 20 10 0 –10

ERL. [dB]

Measurement Conditions

RIN input = –10 dBm 5 kHz band white noise

(0 dBm = 2.2 dBm0)

Echo delay time TD = 20 ms

ATT, GC, NLP = OFF

–50 –40 –30 –20 –10 0

RIN input level [dBm]

0 dBm = 2.2 dBm0

Measurement Conditions

RIN input: 5 kHz band white noise

Echo delay time TD = 20 ms

ERL = 6 dB

ATT, GC, NLP = OFF

Echo delay time vs. echo attenuation

30

20

10

0

1

2

3

4

5

6

7chip

0

50

Measurement Conditions

RIN input = –10 dBm

5 kHz band white noise

(0 dBm = 2.2 dBm0)

100

150

200

Echo delay time [ms]

ERL = 6 dB

ATT, GC, NLP = OFF

The second through seventh chips

are connected in a cascade.

21/28

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