Sony XCD-SX90 Manual técnico - Página 13

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Memory Shot

The camera is equipped with Memory Shot that

temporarily stores an image in the frame memory inside

the camera and transfers it later.

When multiple cameras are connected in the same bus,

all the cameras may not output images at the same time

due to the restriction of 800 Mbps band. Memory Shot

may resolve this inconvenience.

When exposure starts, each camera stores an image in

the frame memory without allocating the isochronous

resource.

When outputting, each PC outputs the image from the

camera allocating the isochronous resource.

The number of images to be stored depends on the video

mode.

Broadcast Command

The normal1394 communication method specifies the

node number at the host side so that only a specified

camera responds to the command.

If the node number is set to 63, all the cameras

connected to the same bus can receive the command

simultaneously, i.e., only one command issued from the

host can control multiple cameras at the same time.

Example: To broadcast a software trigger

1. Connect multiple cameras to the same bus.

2. Set the video mode and frame rate appropriately on

each camera and prepare the cameras for sending

images at the same time.

3. Set each camera to the software trigger mode.

4. Issue a software command for node number 63.

Now all the cameras start exposure and output images

simultaneously.

All the commands including the video mode setting and

the feature control are capable of broadcasting except

the block writing command.

When setting different types of cameras using a

broadcast command, be careful not to issue a command

that the cameras do not support.

1394 Bus

Synchronization

Timing used to start exposure is synchronized with the

1394 bus time cycle register.

If cameras are connected to the same bus, they are

automatically synchronized in a 1394 bus operation. As

800 Mbps band restriction can affect the

synchronization, you must set the video mode in which

the cameras can transmit a video signal at the same time.

1394 synchronization does not work in long exposure

mode and Partial scan mode. In a long exposure, the

exposure time is set longer than the image transmission

cycle.

1394 bus synchronization includes up to 1H cycle jitter.

Hardware external synchronization will ensure greater

accuracy.