Glossary - JRC JAX-9B Installation Manual

1. Specification
JAX-9B W-FAX Installation Manual

1.8. Glossary

Scanning
Primary scanning
Secondary scanning
Scan line density
Scan speed
Index of cooperation
(IOC)
Halftone recording
Start signal
Phase signal
Similar phase signal
7ZPNA4095
When a facsimile broadcasting is received and recorded, the recording of the
received image starts one dot by one dot from the left end of the paper. When
the recording reaches the right end, it is returned to the left end of the paper again
and the same operation is repeated until the image recording is completed. This
operation is called "scanning".
Scanning in the horizontal direction as shown above
Scanning in the vertical direction as shown above
The number of scan lines plotted while the paper moves one millimeter in the
secondary scanning direction during the recording of received signals.
Primary scanning speed: for example, 120 primary scannings per minute are
performed at 120 spm (scan per minute).
If the paper size transmitted from a broadcasting station is different from the
recording paper size on the receiving side, it is necessary to equal the vertical and
horizontal reduction or enlargement of the original paper to keep a similar figure.
The coefficient to keep a similar figure between transmitting and receiving sides is
called "index of cooperation".
This is a method of displaying the contrast of clouds in recording cloud photos
taken by a meteorological satellite, in which the contrast is displayed by the
difference in the density of black dots like in a black/white photo in a newspaper.
It is indicated as HALF in this manual.
Start signal is the signal transmitted at the beginning of the facsimile
broadcasting to indicate the start of the broadcast.
JAX-9B uses it for the automatic setting of the index of cooperation (IOC) and
starts the automatic recording by receiving this signal.
Phase signal is the signal transmitted next to the start signal. It is indicated at the
both ends of the image when synchronization is made. It is used for the
automatic setting of scan speed and it is an essential signal used for the automatic
recording (AUTO), manual recording (MANU), and timer program recording.
Similar phase signal appears at the same position as the phase signal in the image
signal. Depending on broadcasting stations, it may not be included in the image
signal. In JAX-9B, this signal is used for phase matching in the manual
recording and forced recording.
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