MSM7557 Ver la hoja de datos (PDF) - Oki Electric Industry

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MSM7557

Single Chip MSK Modem with Compandor for Cordless Telephone

Oki Electric Industry 

¡ Semiconductor

MSM7557

MSM7557 Filter Characteristics

MSM7557 has wide band filters (0.3 kHz to 3.4 kHz) as follows.

Pre-Emphasis ........................................................................................................ Fig. 4

Splatter Filter ........................................................................................................ Fig. 5

RBPF ....................................................................................................................... Fig. 6

De-Emphasis ......................................................................................................... Fig. 7

Transmit Total (HPF1 + Pre-Emphasis + Splatter) ......................................... Fig. 8

Receive Total (RBPF + De-Emphasis) ............................................................... Fig. 9

Transmit and Receive Total ................................................................................ Fig. 10

Fig. 4 to Fig. 10 show the filter characteristics when RCK2 is digital "0". When RCK1 is digital "0" and

RCK2 is digital "1", the filter characteristics change 0.972 times on the frequency axis. (pass-band

becomes narrow) When RCK1 is digital "1" and RCK2 is digital "1", the filter characteristics change

1.029 times on the frequency axis. (pass-band becomes wide)

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