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Canon XL H Series HDV Camcorders
Canon XL H1S (with SDI), Canon XL H1A (without SDI). Also XL H1.


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Old September 14th, 2005, 07:06 PM   #1
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4 channels of audio.

I loved the 4 channel audio recording on my XL1 and at first I was very excited to read about the XH1 having 4 audio channels. Does the XH1 really record 4 audio channels on HDV or is that for DV only recording? Where would they fit the other 2 channels for 1080i HDV since it already uses the full 25mbits? Perhaps the bitrates for the audio channels are cut in half to 192 kbits.
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Old September 14th, 2005, 08:07 PM   #2
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Hi Thomas,

The official HDV spec has now changed with the introduction of the XL H1. The 24F, 25F and 30F frame rates are indeed supported by HDV, as is the four-channel audio feature.

You are correct about the bit rate... Four channels of 16-bit audio at 192kbps. The audio quality at that bit rate will have to be an individual judgement call based on the shooting situation.
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Old September 15th, 2005, 02:01 AM   #3
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Thanks Chris for the info. I wouldn't think 192 kbits would be all that bad considering most of us are happy with 128 kbits mp3 files or 192 stereo dolby ac3 files. I know dolby is better than mpeg audio but I wouldn't think 192 kbits audio would be as bad as 32 khz audio with 4 channel DV. Don't most PAL DVD's as well as some NTSC DVD's already use 192 kbit stereo mpeg audio?
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Old September 15th, 2005, 04:18 AM   #4
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But for the audio to sound as good as mp3 or DVD audio, wouldn't have to be compressed while recording using one of those compressions at that bit rate?
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