CXA1911 データシートの表示（PDF） - Sony Semiconductor

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CXA1911

Dolby B Type Noise Reduction System with Playback Equalizer

Sony Semiconductor 

Description of Operation

1. Signal route

PBFB PBTC

PBOUT TAPEIN

Dolby level

(–6dBm)

LINEOUT

CXA1911Q

Op1

Op2

4dB

NR

NR ON NR OFF

20dB

20dB

PBIN

FR

Fig. 1

Op1 and Op2 are operational amplifiers.

Op1 composes the playback equalizer by attaching a resistor and a capacitor to PBFB pin, and a

capacitor to PBTC pin.

Op2 is an input selector and a LINEOUT amplifier. The gain is 24 dB.

The Dolby reference level is –6 dBm (LINEOUT).

The adjustment method of playback equalizer is described in the paragraph (3).

Note)

Usually the TAPEIN pin level is adjusted by attenuator connected to PBOUT pin.

The capacitance value connected to PBFB can be reduced by adjusting the resistance

connected to PBFB to match the PBOUT level.

With this method, the capacitance value can be reduced according to the amount that the

resistance value is increased even for the same cut-off frequency.

(These specifications use the latter method.)

—11—

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