Akai PDP4294LV1 Service Manual download pdf (Page 49)

C-bus controlled BTSC stereo/SAP decoder TDA9850

FEATURES

- Quasi alignment-free application due to automatic adjustment of channel separation via

C-bus

- Dbx noise reduction circuit

- Dbx decoded stereo, Second Audio Program (SAP) or mono selectable at the AF outputs

- Additional SAP output without dbx, including de-emphasis

- High integration level with automatically tuned integrated filters

- Input level adjustment I

C-bus controlled

- Alignment-free SAP processing

- Stereo pilot PLL circuit with ceramic resonator, automatic adjustment procedure for

stereo channel separation, two pilot thresholds selectable via I

C-bus

- Automatic pilot cancellation

- Composite input noise detector with I

C-bus selectable thresholds for stereo and SAP off

- I

C-bus transceiver.

NJW1144 AUDIO PROCESSOR

GENERAL DESCRIPTION

The NJW1144 is a sound processor includes all of the functions required to process the

audio signal for TV, such as tone control, balance, volume, mute, and AGC functions.

Also the NJW1144 performs BBE sound enhancement and SRS 3D Stereo. The BBE

regenerates high definitive and nearly real sound, and SRS 3D Stereo regenerates 3D sur-

round sound with only two speakers.

All of the internal stats and variables are controlled by I

C BUS interface.

FEATURES

- Operating Voltage 8 to 13V

- I

C BUS Interface

- BBE Sound Enhancement (Low Boost and High Boost: 15dB max.)

- Internal 6 Input Audio Selectors and Monitor Output

- The AGC circuit reduces volume difference among input sources.

- Variable AGC Compression Level via I

C (4-levels)

- SRS 3D Stereo and Simulated Stereo

- Variable Surround Effect Level via I

- Low Noise VCA

- Bi-CMOS Technology

- Package Outline SOP40

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Akai PDP4294LV1 Service Manual Page 49