CXA2022 데이터 시트보기 (PDF) - Sony Semiconductor

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CXA2022

I2C Bus Sound Processor for TV

Sony Semiconductor 

CXA2022S

Description of Operation

• AGC circuit

The AGC circuit is provided at the input. When AGC is set to ON, this circuit is 0dB for small signal input,

boosts for medium signal input, and achieves gain reduction for large signal input. The sound level

defference between input sources can be absorbed at this circuit.

• Surround circuit

The surround circuit provides three modes; MONO (Simulate Stereo), STEREO-1 and STEREO-2.

MONO mode

L + R signals, passed through the mono filter and then through four stages of phase shifters (PS1A, PS1B,

PS2A, PS2B) and 9kHz LPF, are added to L and R channels at opposite phase to each other.

The surround effect can be changed by the MONO-EFFECT.

STEREO-1 mode

L-R signals, passed through two stages of phase shifters (PS1A, PS1B) and 9kHz LPF, are added to L and R

channels at opposite phase to each other. The surround effect can be changed by the SURR-EFFECT. In

addition, L + R signals passed through the middle frequency BPF (1kHz BPF) are added to L and R channels at

in-phase to each other to prevent "vocal missing" in the surround mode. The addition amount of middle

frequency can be changed by the VOCAL-MIX.

STEREO-2 mode

L-R signals, passed through two stages of phase shifters (PS1A, PS1B) and 9kHz LPF, are added to L and R

channels at opposite phase to each other. The surround effect can be changed by the SURR-EFFECT. In

addition, L + R signals passed through the middle frequency BPF (1kHz BPF) are added to R channel, and the

middle frequency signals passed further through two stages of phase shifters (PS3A, PS3B) are added to the L

channel. The addition amount of middle frequency (L and R) can be changed by the VOCAL-MIX.

Phase Shifter

Each of the phase shifters PS1, PS2 and PS3 consists of two stages of phase shifters (A, B). The transfer

function for a stage of phase shifter is expressed by the following equation.

VO =

1 – SCR

1 + SCR

Vin

R: Internal resistance ≈ 18kΩ, C: External capacitance

• TONE circuit

Provides tone controls for BASS and TREBLE. The external capacitance of CL for BASS and CH for TREBLE

can determine the characteristics. The number of steps is 32.

• BALANCE and VOLUME circuit

Provides controls for BALANCE and VOLUME. the number of steps is 64 each.

• DAC circuit

Provides controls for BASS, TREBLE, VOLUME and BALANCE. The internal impedance is approximately

20kΩ and the LPF capacitance is used externally.

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