MSM7664 データシートの表示（PDF） - Oki Electric Industry

部品番号

コンポーネント説明

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MSM7664

NTSC/PAL Digital Video Decoder

Oki Electric Industry 

¡ Semiconductor

PEDL7664-01

MSM7664

7) AGC loop filter time constant selection (related register AGCLF[7:6])

Slow

convergence time 903 ms

Medium

225 ms*

Fast

56 ms

MGC mode

0

These are designed times from the input gain being rapidly lowered to 50% (–6 dB) of the

value at a stable state when normal signals are input till the output being returned to –1 dB

(actually these times differ depending on the signal state).

MGC mode: manual gain setting is possible by register AGCLF[5:0]

Set the SSEPL[7] value to a 0 when the MGC mode is used.

8) Parameter for fine adjustment of AGC sync depth (related register AGCLF[5:0])

AGC reference level is changed.

9) Parameter for fine adjustment of sync removal level (related register SSEPL[6:0])

The black level is adjusted. The default setting outputs the pedestal position as a black level

(=16).

10)Pedestal clamp selection (related register SSEPL[7])

Do not use pedestal clamp*

Use pedestal clamp (at this time, AGC does not operate, MGC operates)

3. Chrominance Block

This block processes the chroma signals.

The following operating modes can be selected.

1) Selection of chroma bandpass filter usage (related register CHRC[2])

Do not use*

Use

2) ACC loop filter time constant selection (related register ACCLF[6:5])

Fast2

convergence time 27 ms

Medium

424 ms*

Fast

106 ms

MCC mode

0

These are designed times from the input gain being rapidly lowered to 50% (–6 dB) of the

value at a stable state when normal signals are input till the output being returned to –1 dB

(actually these times differ depending on the signal state).

MCC mode: manual gain setting is possible by register ACCLF[4:0]

3) ACC reference level fine adjustment (related register ACCLF[4:0])

ACC reference level is changed.

4) Parameter for burst level fine adjustment (related register CHRC[1:0])

Threshold level at which chroma amplitude becomes valid is selected based upon color burst

ratio.

0.5

0.25*

0.125

Off

Off: The color killer function is turned off. If decoloration occurs while decoding a still picture,

setting the threshold level to "off" will reduce the decoloration.

5) Color killer mode selection (related register MRB[5])

Auto color killer mode*

Forced color killer

6) Parameter for fine adjustment of color subcarrier phase (related register HUE[7:0])

HUE control function

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