Canon PowerShot A300, Руководство по обслуживанию

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1-12
2-3 Fulfiled Movie Function
-Three types of recording pixels (VGA/QVGA/QQVGA) for movie mode
(VGA is high image quality )
The PowerShot A300 can record movie clips with audio at a rate of 15 frames per second in one of three
recording pixels, VGA, QVGA or QQVGA.
Furthermore, the newly developed camera-effective 3.2M-pixel CCD can read one vertical line in
three, or approx. 520 lines per frame, thanks to a refinement in the electrode structure (charge-reading
method). This enables the camera to record
high-quality VGA size movies that not only 3-
megapixel digital cameras, but also digital
cameras equipped with conventional interline
type CCDs can’t.
-Long movie recording with audio (internal microphone and speaker, max. of 3 minutes)
The PowerShot A300 can record moving images at 15 frames per second along with audio in 3 formats, VGA
(640 x 480 pixels), QVGA (320 x 240 pixels) and QQVGA (160 x 120 pixels). Because a method is
employed that consecutively writes images that are temporary stored in the buffer to the CF card while
recording, long continuous filming times are also achieved.
In practice, if the write speed of the CF card is slower
*1
than the speed to write an image to the buffer,
the recording will stop when the buffer capacity is reached. Taking this circumstance into account, the
specification limits the maximum recording time in VGA format to 30 sec.(When using FC-256MH)
and both QVGA and QQVGA formats to three minutes. Even after 30 sec. or 3 minutes of elapsed
filming, the PowerShot A300 allows the next recording to be resumed in less time than previous models.
During filming, the values for the focus, exposure and white balance determined at the beginning are
used continuously to the end of the recording. The storage time is also displayed on the LCD monitor
during filming.
The file is saved in AVI format, while the image is saved as Motion JPEG data and the audio data in
WAVE format (monaural).
Since the camera is equipped with an internal microphone and speaker, movie with sounds can be
played on the camera without connecting to a computer.
*1 The write speed varies depending on the brand and capacity of the CF card.
*2 If the free space on the CF card is less than the size of the recording, recording will stop just prior
to the CF card reaching full capacity.
Approx.1570 Approx.520 480
CCDís vertical pixels Recording pixels VGApixels
Figure 2-9 Blockdiagram for Audio recording and replay