Canon Consumer Products Home Page

XH G1 Home Page
HD Home

CanonDV.com


Inputs and Outputs


For the professional videographer, the XH G1 gives capabilities required by ENG, TV and commercial production professionals. Whether it's a multi-camera broadcast situation, a feature film, or a run-and-gun documentary, this camera delivers all the options needed to flow seamlessly with existing workflows and expectations.

The XH G1 has a series of four terminals located in the rear of the camera, on the shoulder pad. It gives HD-SDI (SMPTE 299M) AND SD-SDI (SMPTE 259M) with embedded time code and audio, SMPTE Time Code In/Out (selectable) and Genlock Input. That means multi-camera shoots are no problem using Genlock synchronization or SMPTE time code input and output. The XH G1's industry-standard connectors bring together all these capabilities, and lets you quickly and conveniently make just the hook-up you need.


Back to Top

SMPTE Time Code

The XH G1 can receive or send out a SMPTE-standard LTC timing signal. This means that you can share time code with an external device (such as a DAT recorder for dual-system sound) or from camera to camera.

For "Time Code In", simply connect the device generating the desired time code and allow the synchronization to stabilize. This usually takes about 10 seconds. Once this is done, the cable connecting the two devices can be removed and the time code synch will be maintained as long as the camera is not turned "Off" or switched into "VCR/Play" mode. The synch will also be lost if you change the FRAME RATE. In SD mode ("Standard Definition") at 24F, you will not be able to import time code at all.

The Time Code input function records to the tape the LTC specification signals input to the time code input terminal as internal time code values. The user bit that is supplied at the same time as the time code signals from this terminal can also be recorded on the tape. The TC input status is established automatically if the time code terminal is set to the "input" status and the LCT time code is input. The time code data which has been input from an external source is supplied to the free-run counter inside, and after it leaves the time code terminal, the free-run mode (indicated by "F") is established automatically, and the external input is counted up continuously.

For "Time Code Out", you must go into the menu and activate the T. CODEOUT option on the SIGNAL SETUP page. Then, you can hook up another device to receive the time code that is being generated by the camcorder (or that has been imported from yet another device in the chain).

The Time Code output function outputs the internal time code data from a time code output terminal using signals compatible with LCT specification. The time code can also be superimposed onto the SDI terminals and output. Both terminals are placed in the permanent output status. If the time code terminal is set to the "output" status, the LTC time code is output at all times except in the card VCR or card camera mode. If the "SDI output" setting is "ON", the time code data is also output all the time to the SDI terminals.

When sharing time code, only the FREE RUN mode will be useful; it is the only mode that runs continuously, regardless of whether or not the operator has pressed "Record". This FREE RUN option is found in the menu, within the TIME CODE sub-heading on the CAMERA SETUP page.

Note: No matter what frame rate that the XH G1 is set to, in 60i mode the HD-SDI output is always 59.94i and, in 50i mode (optional), it is always 50p.

Back to Top

HD/SD-SDI Output (Embedded Audio & Time Code)

The Serial Digital Interface (SDI) terminal delivers full resolution uncompressed HD-SDI (SMPTE 299M) and SD-SDI (SMPTE 259M) at a 4:2:2 color space. The audio data is superimposed onto the blanking period of the SDI or HD-SDI output image data, and the video and audio data are sent along a single BNC cable.

This terminal is also capable of transmitting the lower bit-rate SD signal from the camera even when the XH G1 is set for HD or recording HD to tape. What's more, since the signal is transmitted via coaxial cable, you can run 100 meters without worrying about any lost data. This is ideal for situations when the camera is in a crane, or traveling during a long walk-around shot. When using the SDI terminal to output a signal, make sure that the SDI OUTPUT is set to "On" in the SIGNAL SETUP page of the menu. Also, when outputting the HD signal, set the SDI SPEC to "Auto".

Note: No matter what frame rate that the XH G1 is set to, in 60i mode the HD-SDI output is always 59.94i and, in 50i mode (optional), it is always 50p.

Back to Top

GENLOCK

Genlock enables multi-camera shoots such as live broadcasts. (Either tri-level or black-burst sync can be used for HD synching.)

Genlock is a signal sent from an external source (such as a sync generator, switcher or other camera) that ensures the seamless interaction between images by making sure that the different video signals are all being "generated" with the same timing, in sync with one another. This is an absolute must in a "live" broadcast environment, for example, when images must be edited on the fly without visibly "jumping". Each video signal has its own vertical and horizontal phase values (its own unique "timing", when the scan-lines are actually being "drawn" across the screen).

The Genlock reference can be as simple as another video signal, which will "teach" its timing to the new signal and thus synchronize the two so that the video images are being drawn exactly in unison. Thus, there will be no "bump" or "stutter" during transitions when intercutting or overlapping images from multiple camera sources.

Activate this feature by going into the EXT. SYNC option on the SIGNAL SETUP page of the menu. Select either "Genlock" or "Genlock+ TC", depending on your specific input situation. Use the GENLCK ADJST option (on the same menu page) to match the phase of your reference signal.

Genlock is implemented automatically if input signals are supplied to the GENLOCK terminal.

Back to Top



See the HD Difference - Watch HD Video