Sanyo VPC-PD2BK Service Manual page 5

4. Lens drive block
4-1. Zoom drive
Drive settings are made by means of the signals (ZIN1 and
serial control) which are output by the ASIC (IC101). The zoom
driving voltage (ZOUT+, and ZOUT-) are output in accordance
with the settings from the motor driver IC (IC951) to drive the
zoom DC motor.
Detection of the standard zooming positions is carried out by
means of signal (ZPROUT) from the photoreflector by ASIC
(IC101) is detecting inside the lens block. Also, getting of the
zooming positions is carried out by the ASIC (IC101) count-
ing the photointerruptor (ZPIOUT).
4-2. Focus drive
Drive settings are made by means of the signals (F_CLK and
serial control) which are output by the ASIC (IC101). The fo-
cus driving voltage (FOUT_A+, FOUT_ A-, FOUT_B+ and
FOUT_B-) are output in accordance with the settings from
the motor driver IC (IC951) to drive the focus stepping motor.
Detection of the standard focusing positions is carried out by
the ASIC (IC101) detecting the signal (FPIOUT) from the
photoreflector inside the lens block.
4-3. Iris drive
Drive settings are made by means of the signals (serial con-
trol) which are output by the ASIC (IC101). The iris driving
voltage (IOUT1 and IOUT2) are output in accordance with
the settings from the motor driver IC (IC951) to drive the mov-
ing magnet motor for iris.
4-4. Shutter drive
Drive settings are made by means of the signals (SIN and
serial control) which are output by the ASIC (IC101). The shut-
ter driving current (SOUT1+ and SOUT2-) are output in ac-
cordance with the settings from the motor driver IC (IC951)
and then the moving magnet motor is used to drive the shut-
ter constant by these drive signals, and then mecha shutter
is opened and closed.
5. Video Clip Recording and Playback
5-1. Recording
The signal from the camera block is input to IC101 (ASIC). The
data that is input to the ASIC is input to SDRAM, and converts
this data to encoded MPEG4 data, after which it is written in
sequence onto the SD card as streaming data. At this time,
the audio signals that are input to the built-in microphone are
converted into digital data by the audio CODEC IC of IC181,
and they are then input to ASIC. The audio data is then en-
coded (AAC), and then it is written in sequence onto the SD
card together as streaming data with the image signals de-
scribed above.
5-2. Playback
The data is read from the SD card, and the encoded data is
decoded into image data where it is displayed by the LCD or
on a TV monitor. At the same time, the audio data is also de-
coded, and is input to IC181 as digital data. D/A conversion is
carried out at IC181, and the sound is then output to the speaker
or to the LINE OUT terminal.
6. Audio CODEC Circuit (IC181)
The audio signals from the microphone are converted into 16-
bit digital data. AD conversion is carried out at a maximum
sampling frequency of 48 kHz.
During audio playback, the 16-bit digital data is converted into
analog signals and these are output to the speaker or line out
system. DA conversion is carried out at a maximum sampling
frequency of 48 kHz.
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