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Thread: Getting decent video audio on your Seven

  1. #21
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    Welcome Jeff! I am sure more than a few of us would be only to keen to help you get into a seven! Plenty of owners in TX who could take you out for a taster!

    Does the replay mic that you are using allow you to set gain? I have not seen that feature in video mics before?
    Mike
    2010 Caterham CSR with Cosworth 2.3 Duratec
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  2. #22
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    Feb 2009
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    The gain is not adjusted on the microphone. The gain setting, along with several other camera settings, resides in an editable text (txt) file that resides on the memory card. When the camera is powered up, the camera processer reads the settings on this text file. There are several settings that can be changed within the camera: exposure, sharpness, white balance, contrast, saturation, frame rate, mic gain, and so on.

    The Replay microphone is a battery powered condenser microphone, just like the Audio-Technica ATR3350.

    I know Paul Kwan in Houston, who has three Caterham Sevens. He's kindly let me drive two of them. It's partially his fault that sleep with pleasant dreams of driving a Seven.

  3. #23
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    I made another attempt taking video on our trip from Los Angeles up to Canada to join the Grizzly Bear tour. This time I tried to do it the simple way(without the servo controlled swivel gadget I used to have) using a Drift Ghost HD attached to the windscreen frame and a remote mic behind the (full) windscreen. The matchbox size remote control is strapped to a steering wheel spoke. The camera can run in standby mode for 4-5 hours.

    Video appears to be pretty good and the audio is also not bad in principle. No wind noise at all. However, I noticed when cruising long distance at e.g. constant 3000 rpm in fifth gear, the hissing noise of the tires on the road is usually louder than the exhaust or intake, except for the occasional burst when passing. But even the constant engine drone when cruising is not that appealing.

    Not sure what to do with that. Maybe I need to find some appropriate background music, after all.

  4. #24
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    Jul 2009
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    Quote Originally Posted by JeffC View Post
    Hello. My name is Jeff, and I've been a lurker of this forum for a while as some day I hope to be a 7 owner.

    I've been reading this thread, as I too have been playing with POV cameras. I thoroughly enjoyed reading Croc evaluation of different cameras.

    I drive a BMW Z4 M coupe in autocross and track events. I have the Replay XD 1080HD, and like xcarguy I love the video quality, but it was a challenge to get great audio quality. I too found the windbreakers not to solve the wind noise issue. I got the Replay external mic, and tried it in all different positions. The best location I found is in the engine bay, and the second best is with the microphone clipped on the rear license plate pointed towards the exhaust.

    Here are some examples with the microphone mounted in the engine bay (gain setting at max 59 dB):
    http://youtu.be/OMA4O5Fxg0k
    http://youtu.be/6uRwH4yZ9k0

    And on the rear plate:
    http://youtu.be/PcA8_-Df_4U
    JeffC,Thanks for the post. I'll be sure and check the dB level on my text file.

    X
    Stalker V8, chassis #85

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  5. #25
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    Feb 2009
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    I am by no means an electronics expert, but my guess the whine is EMF from the alternator or ignition system (high energy coil, i.e. MSD).

    There are filters you can buy and attach to the alternator, or MSD, to eliminate the noise. Search the net for more info.

    You posted earlier that you use the external power option (12VDC accessory power jack). Have you tried unplugging that and running off of the internal battery alone? I wonder if EMF could be transmitted through the power cord.

  6. #26
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    Oct 2008
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    HAHAHA, I was sitting in the Dallas Ft Worth airport listening for that whine on my Iphone ear buds. I could make out the whine at the end just barely, but then it got a whole lot louder. Way louder! In fact it got so loud that the whine kept going after the video ended, which I thought was another plus for the I-Phone. Nah, it was just a door alarm going off. For a minute there, I thought you had a really bad alernator.

    Tom

  7. #27
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    Going to do more testing today. I'll post results.

    Tom, now that's funny.

  8. #28
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    Quote Originally Posted by JeffC View Post
    I am by no means an electronics expert, but my guess the whine is EMF from the alternator or ignition system (high energy coil, i.e. MSD).

    There are filters you can buy and attach to the alternator, or MSD, to eliminate the noise. Search the net for more info.

    You posted earlier that you use the external power option (12VDC accessory power jack). Have you tried unplugging that and running off of the internal battery alone? I wonder if EMF could be transmitted through the power cord.
    JeffC,

    Thanks for the input. I have not tried using the internal (battery) camera power with an external mic. Once I get strapped in the car, It's a) hard to get to the buttons on top of the Reply with camera sitting above and behind me and b) it's easier to plug it in an external power supply and allow the camera to turn on and record automatically.

    No MSD on my car, but the mic was positioned next to ECU wiring and almost directly in front of the ECU. I'm going to try moving the mic first and then go from there if I still have noise issues.

    X
    Stalker V8, chassis #85

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    Get up in the morning and give the day your very best. You donít get it back.

  9. #29
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    I looked/listened at the latest results with the Drift Ghost HD again today on the big computer and better speakers. Actually not so bad, see short video/audio sample below. This is with the $30 Radioshack lavalier omnidirectional mic tucked with weatherstrip tape into the nook between windscreen frame and scuttle. The rubber weatherstrip insulates against direct body contact noise. This mic does not need a battery, apparently it gets its bias voltage from the camera. The camera mic sensitivity is set to minimum.
    https://www.dropbox.com/s/s5igxuhpqs...SoundTest1.avi

  10. #30
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    Quote Originally Posted by slomove View Post
    I looked/listened at the latest results with the Drift Ghost HD again today on the big computer and better speakers. Actually not so bad, see short video/audio sample below. This is with the $30 Radioshack lavalier omnidirectional mic tucked with weatherstrip tape into the nook between windscreen frame and scuttle. The rubber weatherstrip insulates against direct body contact noise. This mic does not need a battery, apparently it gets its bias voltage from the camera. The camera mic sensitivity is set to minimum.
    https://www.dropbox.com/s/s5igxuhpqs...SoundTest1.avi
    slomove,

    In the video, before you make the turn, does the road straight ahead take you out to Kicking Horse reservoir?
    Stalker V8, chassis #85

    Stalker Chassis #85 Build Gallery
    Stalker Chassis #85 Owner Thread

    Get up in the morning and give the day your very best. You donít get it back.

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