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ZR36504

Video & Audio Interface solution via USB

Unspecified 

ZORAN Corporation

USBvision II Data Decoder

ZR36505 Data Sheet

The ZR36504 utilizes a single USB port to enable the host computer to access 4 different

data channels simultaneously. These 4 channels are the Digital Video input (7.5Mbit/sec),

Digital Audio input, Serial Bulk data input, and I/O control (internal registers, programmable

I/O pins, and selectable Data/Clock serial protocols).

Due to the sophisticated architecture and protocol of the USB, the software application is

not required to take care of the time-sharing management of several tasks using a single

serial bus; This is handled by the lower-level drivers, so that the application program can

access each function of the ZR36504 independently.

In normal operation, the ZR36504 will provide the system with the following services:

• Compressed Video Channel: The ZR36504 connects to a Y/U/V video digital

source, scales the image on the fly horizontally and vertically, compresses the data down

to 0.5-7.5Mbit/sec, and sends it to the host computer via the USB port. The ZR36504

scaler supports zoom-in like effects, by applying combinations of zooming and cropping

built-in functions. The unique method of compression is a special design of Zoran, to

allow easy and fast de-compression in software only means. The de-compression

software driver supplied with the ZR36504, will accept the compressed data and

convert it back to standard video formats in less time than it takes to read raw video

from any external port. Still images can be captured and sent via the USB in the best

quality and resolution that the camera can provide.

• Sound System: Some camera applications require that a microphone sound system will

be implemented inside the camera. Also, a Composite -Video to USB adapter

applications requires audio recording support as well. The ZR36504 provides solution

for these applications, by multiplexing a serial digital audio input with the video data that

is sent via USB port. In such a system, the microphone can be located inside the

camera, up to 5 meters away from the host computer. The ZR36504 does not include

the audio A/D, and is designed to use an external low-cost telephony audio codec.

• Camera Control: Camera (or any video source) control and status monitoring can be

carried out by a built-in serial interface, or direct I/O pins. The serial interface supports

some commonly used serial protocols. These ports can be used by the application

software to control and monitor some other remote devices as well. In a Video

Conference application, this allows the local or remote user to set the focus, zoom, and

other parameters of the camera, or even to switch the camera to the power-down

mode. The ZR36504 also supports usage of an external capture button that is mounted

on the camera board and used for capturing video frames on the host computer disk

(this is application dependent; the ZR36504 only delivers the capture command signaling

from button to host computer via USB).

November-99

Page 8 of 8

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