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CXD2053AM/AS

1. Description of auto wide function

The auto wide function performs wide screen identification from the black bands at the top and bottom of the

screen. As shown below, the CXD2053AM/AS identifies the three types of 4:3 normal video, 16:9 wide video,

and wide video with subtitles.

4:3 normal video

16:9 wide video

Wide video with subtitles

Fig. 1. Wide identification types

bus mode. Also, these results are output directly to the OAW1 (Pin 26) and OAW2 (Pin 27) pins regardless of

bus or bus-free mode.

Auto wide identification is provided with a transition time of about 1 to 15 seconds to prevent misoperation.

the INST bit.

2. Description of ID-1 (transmitter method of additional video information, aspect ratio identification)

As shown in the table below, the additional video information consists of 14-bit data, to which a 6-bit CRCC is

appended for a total of 20 bits. On an NTSC video signal, this information is carried on lines 20 and 283 of the

vertical blanking interval.

bit-No

WORD0

WORD1

WORD2

Description

"1"

"0"

A

B

1

2

3

Transmitter aspect ratio

Pictorial representation format

Undefined

Full mode (16:9)

Letter-box

4:3

Normal

Discrimination information about the video signal and any other signal (audio

signal, etc.) incident to the video and transmitted simultaneously.

Word 0 dependent discrimination signal

Word 0 dependent discrimination signal, information, etc.

4

5

6

4-bit width

4-bit width

(From the Provisional Standard of EIAJ, CPX-1204)

Table 1. Description of ID-1 signal

Of the 14-bit data noted above, only the first 2 bits are handled by the CXD2053AM/AS. These 2 bits are

(Pin 25) regardless of bus or bus-free mode.