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About dv, Audio area, Iti (insert and tracking information) area – JVC GR-DVX70 User Manual

Page 5: Sub-code area, Video area

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EN

5

ABOUT DV

The digital camcorder converts incoming audio and video signals into digital form for recording.

A video signal is composed of a luminance signal (Y) and colour signals (R-Y and B-Y). These signals are
identified and recorded digitally (Digital Component Recording). The A/D (Analogue to Digital) converter
samples the Y signal at 13.5 MHz, and R-Y and B-Y at 6.75 MHz, and changes them to an 8-bit quantum
signal.

Sound sampled at 48 kHz is changed to a 16-bit quantum signal, and sound sampled at 32 kHz is converted to
a 12-bit signal.

3

Audio Area

The digital audio signal is recorded here.

4

ITI (Insert and Tracking
Information) Area

Insert editing and post-recording editing
tracking signals are recorded here.

1

Sub-Code Area

The Time Code and Date/Time data are
written here, separate from the video data.
This enables you to display the date and
time during playback, even if they weren’t
displayed while recording.

2

Video Area

The digital video signal is recorded here.

Lens

Mic

A/D

conversion

Chromatic

Analysis

12 tracks/frame

VIDEO

Luminance Signal (Y)

A/D

conversion

A/D

conversion

AUDIO

Recording by
rotating head
helical scan

Tape direction

Sub-Code Area

Video Area

Audio Area

ITI Area

Head tracking
direction

5.24 mm

6.35 mm

Signal

compression

Colour Difference
Signal (R-Y/B-Y)

Chrominance (C)

This camcorder separates the data into blocks, writing one block of each data type on each track of the tape.