GB 1089.EM3ECircuit Descriptions and Abbreviation List
9.13.2 NexTViewPrinciple
SCAVEM will improve the slope as follows:
NexTView allows the user to display a program guide on theAt a positive slope, a SCAVEM current is generated which
TV screen, that contains extensive information for eachsupports the deflection current. At the first half of the slope,
program (only when supported by the programs provider).the spot is accelerated and the picture is darker. At the
second half of the slope, the spot is delayed and the slope
This information can be displayed in a number of differentbecomes steeper.
summaries:At the end of the slope, the SCAVEM-current decays to zero
DAY: The daily summary shows, from the currentand the spot is at the original position. An overshoot occurs
moment, the program schedule for several stations for awhich improves the impression of sharpness.
short time ahead.At the negative slope, the SCAVEM-current counteracts the
CHANNEL: The channel summary shows the programdeflection. During the first half of the slope, the spot is
schedule for one station.delayed, the slope becomes steeper. During the second half
THEME: The theme summary shows, for each theme,the spot accelerates, the SCAVEM-current is zero at the end
the program schedule of the various stations. Theseof the slope.
themes consist of sport, film, culture, etc. and is
determined from the station side.Implementation
Via the three resistors R33358, R33359 and R3360, Red,
NexTView does not have to restrict itself to information aboutGreen and Blue are added together, buffered and offered to
the station that is being viewed, but also offers informationthe emitter of TS7300. On the collector of this transistor,
about other stations. In the various summaries 3 differentconfigured in a common base, the sum of these 3 signals is
commands can be given for the various program overviews.obtained. Via the emitter follower formed with TS7301, this
These commands appear as follows:signal is conveyed to the differentiator C2330, R3324 and
WATCH: The set immediately switches over to theR3318. Only the high frequencies are differentiated (small
station concerned.RC-time).
REMINDER: The start time and date and the station ofThe positive and negative pulses of this signal drive
the program concerned is stored in the TV reminder list.respectively TS7303 and TS7302 into conductivity. The DC
The TV will give an OSD-message with the programsetting of the output stage is set by R3304, R3308, R3316
information, or switch on the set at the correct momentand R3319. The working voltage of the transistors is settled
(provided the set is in Standby) and tune to the stationat half the supply voltage.
concerned.At the positive section of the pulse, the current flows through
RECORD: The timer of the video recorder with ?EasylinkR3318, C2307, the SCAVEM-coil and TS7303. At the
Plus? is programmed with the data of the programnegative section of the pulse, the current flows through
concerned. There has to be a video recorder (withR3318, C2309, the SCAVEM-coil and TS7302.
Easylink Plus) connected to SCART2 otherwise the
?RECORD? function will not be highlighted. The9.14.3 Rotation
connection is via pin 10 from SCART. This means that it
has to be a full SCART or at least pin 10 has to be wired.In sets with a rotation coil (wide screen sets), the amount of
frame rotation is adjusted with the DAC-output of the HOP
In order to be able to realise NexTView, two teletext type data(see also 'Vertical Deflection').
flows, Data stream 1 and 2, are transmitted with various sub-
code pages of information. This data flow can transport
limited information (max. 40 pages). Data stream 1 is quick9.15 Software Related Features
repeating with a repetition time of approximately 20 to 30
seconds. However, Data stream 2 has a much longerFollowing features are described:
repetition time of approximately half an hour and has a largeAuto TV
transport capacity.
?Switch On? Behaviour
Data stream 1 contains information of the station that is
being viewed.
9.15.1 AutoTV
Data stream 2 contains up to one week of advance
information from various stations that are covered by the
provider.The AutoTV (or 'Automatic Picture Control' or 'Active
Control') aims at giving the customer the best possible
picture performance at any time. Therefor it does real time
9.14 CRT / SCAVEM / Rotation (diagram F)processing of the video signal and as a result, it decides to
adapt several video parameters throughout the whole
9.14.1 RGB Amplifierschassis.
On the CRT panel, the RGB amplifier (TDA6108, IC7307) isThe AutoTV feature integrates traditional picture
performance, AutoTV functionality and 'smart controls' in
located. Via the outputs 7, 8 and 9 the cathodes of the pictureorder to come to a kind of 'super smart' TV. It can be
tube are driven.
The supply voltage for the amplifier is 200 V and is derivedsubdivided in:
Auto Noise Reduction. This algorithm measures the
from the LOT.
amount of noise in the incoming video signal (this is done
by the LIMERIC part of the PICNIC). As a result of this
9.14.2 SCAVEMmeasurement, the amount of noise in the picture is
corrected, starting from that noise level which is
The SCAn VElocity Modulation (SCAVEM) circuitry isannoying for the customer. Which parameters exactly
implemented in the layout of the picture tube panel. It is thuscan be used is depending on the hardware.
not an extra module. This circuit influences the horizontalAuto Sharpness. This algorithm measures the amount
deflection as a function of the picture content. In an idealof sharpness via the bandwidth of the incoming video
square wave, the sides are limited in slope due to a limitedsignal and adapts the peaking frequency in the PICNIC
bandwidth (5 MHz).according to this info. If the 'sharpness meter' sees the
video content as 'sharp', high frequency peaking will be
used. On the other hand, if the picture content is seen as |
ACEC
PHILIPS
