FR2697705A1 - Programmable electronic synthesizer for TV collective antennas. - Google Patents

Abstract

a) Programmable electronic synthesizer for collective TV aerials. b) characterized by the fact that in the program of the tuning process of each channel are stored all the signal data converted into bias voltages (Vs1 to Vs3 2), before being applied to the corresponding filters, corresponding memory positions to each of the outputs (s1 to s3 2) for each tunable circuit (CR1 to CR3 2) to which they are routed by means of the selector (7) in an uninterrupted sequential process. c) The invention relates to a programmable electronic synthesizer for collective TV antennas.

Description

Programmable electronic synthesizer for antennas

collective TV ".

OBJECT OF THE INVENTION

  The present invention relates to a

  programmable electronic thesaurus for antennas

  television programs, linked to the electronic tuning

  tronic of TV reception channel filters for

  the three bands, UHF bass, UHF high and UHF to sync

  The channel filters incorporated into the synthesizer include diodes known as

  trade name by "varicap" whose capacity

  is adjusted to the value necessary for the resonance by means of the application of a certain voltage or "tuning signal programmed in a memory and

governed by a microcontroller.

STATE OF THE ART

  GB-2 187 906-A is known the system for tuning resonant circuits with diodes

  "varicap" through the application of

  specific to each of them, which have been stored in the form of binary codes in a memory device from which they are extracted and carried by a microcontroller and converted by the

  corresponding DC / AC converter We also know

  customarily the parallel resonant circuit structure with inductance and "varicap" having a terminal connected to ground, the signal voltage

  being applied to him through a resistance.

  The application of a particular tuning signal to each resonant circuit or syn-

  tonable allows the construction of filters with "va-

  ricaps "not coupled and with tolerant components

bigger.

  There is also (ES-515 591) a sequence of

  microcontroller or logic circuit to achieve the

  tuning the tuning of each channel as

  follows: receive and decode the channel select indication

  keyboarded; collect from a non-void memory

  latile the previously programmed and saved data

  at the factory for each device; set the direction of the memory position corresponding to the band and the channel to be tuned; produce the tuning signals by means of a DC / AC converter and,

  after amplification, apply them to the separate filter

  In the synthesizer of the said patent,

  shares the same converter and amplifier for the various tunable circuits that form a

  same filter and their switching for their adjustment

  dividual is made by switches that receive

  the control signals from the

than.

  In the known digital systems of synchronization

  channel filters, the signal data, i.e. the bias voltages of each "varicap" recorded in the memory device,

  have been pre-established at the factory for the syn-

  possible for a single channel number and

  The variation of the signal data of the

  requires means of erasure and reprogramming

  which require the return of the equipment to the factory View as the tunable channel numbers for the reception of images of the different broadcasts

  varies from one geographical area to another, the

  amplifiers for collective antennas

  must have a variety of regulated devices,

  each of them being suitable only for a particular area

born.

DESCRIPTION OF THE INVENTION

  The programmable electronic synthesizer for collective TV antennas which is the subject of the invention has a structure of 2 or more coupled tunable circuits, where each of them has a

  control input to apply individually

  the correct voltage or tuning signal.

  In an EEPROM memory device under the

  form of binary signal data, are

  factory-calibrated the bias voltages appropriate for each tuner circuit and for each of the channel frequencies; in addition to data

  channel numbers and

  be the assignment to a given channel number of a given filter number and the corresponding bias voltages, one for each circuit

  tunable for each channel, "filter status".

  Unlike the memories mentioned in the state of the art, the EEPROM memory device used makes it possible to erase and reprogram the data by means of electrical pulses, which is why these operations can be performed on the

  location of equipment installation This difference

  The characteristic of the memory device used in the digital tuning system described here makes it possible to incorporate the memory after a time.

  fixed in advance or by keyboard

  channel resulting from the tuning procedure

  This is done by the installer to replace the original data entered at the factory. This eliminates the need to provide devices with different settings. Only one type is used for all geographical areas regardless of the channel numbers to be tuned. - even assigns a filter number to each channel on the spot and can repeat the tuning procedure under other conditions

  of the installation without the device having to be

  sent to the factory to replace one of the filters of the

  for example, or as a result of a new reorganization of channels, which would be necessary

with current devices.

  By the keyboard, the user introduces into the microcontroller the channel numbers, the filter numbers

  and the filter status instructions and the end of pro-

  tuning procedure During the synchronization procedure

  toning, a display shows the channel number

  selected and the one of the filter with which

the.

  The signals programmed to tune

  resonant circuits from a filter number to the se-

  selected for this filter are sent by the microcon-

  troller to a circuit developed to constitute itself in

  dynamic memory, with a plurality of outputs

  each of them to a tunable circuit

  filter, which receives them, before their application,

  vertically into analog signals and amplified to the required DC voltage level in the polarization of a

diode "varicap".

  The number of outputs needed from the

  The dynamic moire must be at least the product of the quantity of tunable circuits composing a filter and the quantity of channel filters available.

  the amplifier apparatus, the superfluous outputs

to remain vacant.

  For economic reasons, we can not

  use an amplified DC / AC converter

  for each output terminal The number of

  has been reduced to the extent permitted by the time of the switching and storage sequence of the dynamic memory circuit and is available for this purpose.

  a selector that routes to this dynamic memory.

  the signals corresponding to each output and simultaneously switches a number of outputs of this

  dynamic memory equivalent to the number of converts

whose device has it.

  Thanks to the type of EEPROM used, the programmed channel tuning process algorithm allows the microcontroller to perform the

  reprogramming a filter with another

  channel or other tuning frequency at

  where the installer decides to change at any time

  what moment is the state of any filter selected

  using the keypad the new number of

  for the channel that you want to tune and realizing to follow continuously and automatically

  the routine of tuning operations:

  corresponding programmed signal data of the EEPROM; introduction of these data

  in the converters; control of dynamic memory

  by means of a selector and application of the

  appropriate for each of the tuning circuits

  selected filter through the outputs of the

  dynamic memory The user decides the end of the synchronization

  all channels, reprograms the new channel assignment to the filters or the new

  filter "in EEPROM memory and microcontroller

  begins their permanent cycle of work in char-

  systematically in the converters the data of each channel tuned and applying them to the corresponding filter until a new decision

  filter state change The new filter state

  it will also remain in the EEPROM memory for later start-up or starting of the device, after a power failure, for example,

  or when reinstalling the amplifying device

  the memory that will start from the channels reprogrammed

  during the last tuning operation.

  To prevent the same channel from being

  tuned at the same time for more than one filter, the half

  crocontroller makes a comparison between the channel

  of the filter that is used in the synchronization process.

  description and the channels assigned to the other

  tres and rejects this channel if it has already been assigned.

DESCRIPTION OF THE DRAWINGS:

  Figure 1 shows the electrical diagram of the structure

  fundamental aspect of a channel filter used.

  FIG. 2 is a schematic representation of the

  of the 32-bit dynamic memory applied to an equivalent number of tone tuning circuits.

programmable filters.

  FIG. 3 represents the digital syntactic system

  circuits that make up 8 filter

nal.

  FIG. 4 shows the flow diagram of flu X of the algo-

  rithm for tuning and reprogramming filters.

  PREFERENTIAL REALIZATION OF THE INVENTION

  At the sight of the drawings, it can be seen that

  the programmable electronic synthesizer for antennas

  collective TV stations, following a preferred

  of the invention, uses the structure of

  is known which is shown in Figure 1, composed of four circuits CR 1 to CR 4 tunable "varicap", two of them before the amplification step and the other two at its output, each being activated from from its control line R 1 to R 4 with the voltage V: to

  V 4 or the particular tuning signal of pro-

  in the EEPROM 3 at the factory for each

  channel or later by the installer, this

  therefore containing EEPROM, programmed

  in the form of binary data, the appropriate voltages

  asked to tune each channel with each of the

  filters as well as the status of each filter.

  The number of programmable TV channels of a preferred apparatus for collective antennas being eight, is used, as shown in Figure 3, a dynamic RAM 8 to 32 outputs s, 532

  to which the particular tuning signals are sent

  sequentially, four to four, to

using the selector 7.

  For the simultaneous application of four

  to an equivalent number of circuits of the same filter 11 to 18, four sets of

  of a DC / AC converter 5 and amplifier 6 The system

  digital programming is governed by a micro-

  controller 1, who receives instructions from the

  using the keypad 2 The installer follows the

  tuning process thanks to the indications of the

  screen 4 which indicates at any time the filter number

  11 to 18 that works and the number of the tuning channel

is.

  The tuning and reproduction sequence

  The grammage governed by microcontroller 1 is

  flow diagram of Figure 4: in

  block 26, it is decided to modify or not to modify

  In the negative, the tuning routine will be repeated for each channel (blocks 23 to 25) with the filter initially selected: data loading in the converters 5 in the block 23; dynamic memory control at medium

  selector 7 in block 24; application of

  corresponding signals through the dynamic memory in block 25 If we decide to modify the state of a channel, we select the new filter in the block

  27 and then perform the tuning program

  tion, represented by block 28 Once the required channels definitively tuned, by means of the corresponding instructions, block 29, the

  EEPROM 3 stores the new data of assi-

  block 30 and the block 28 road in

  work "is now performed repeatedly

ve.

Claims (2)

  l 1) Programmable electronic synthesizer   for collective TV antennas, including a   channel filters (11 to 18), each of which   taking several tunable circuits (CR, CR 4) to   inductance and "varicap" in parallel, a microcontroller   their (1), a keyboard (2), a display (4) and a dis-   memory positive (3) for storing the programmed signal data, a reduced number of DC / AC converters (5) and amplifiers (6) which produce, in a repetitive sequential process, the DC voltages   (Vs 1 to Vs 32) polarization of "varicap" for the syn-   filtering, characterized in that for the switching and routing of data of   signal, it has a selector (7) and a   dynamic memory tif (8); the memory device   dynamic re (8) has a plurality of positions   of memory in which, in the program of the pro-   tuning of each channel, all signal data converted into polarization voltages (Vs 1 to Vs 32) are stored before being applied.   corresponding filters, memory positions cor-   corresponding to each of the outputs (sa to S 32) for each   tunable circuit (CR 1 to CR 32) to which they   are conveyed by means of the selector (7) in one uninterrupted sequential cessation.   2 e) Programmable electronic synthesizer for collective TV antennas according to the claim   1, characterized in that the memory device   re (2) for storing signal data is of EEPROM type and records all signal data corresponding to all filters and bands tunable frequencies.   Programmable electronic synthesizer   for collective TV antennas according to the claims   above, characterized by the fact that the   tuning program (blocks 23 to 25) being executed   cut, it is established that the user decides to modify or   do not change the filter status programmed in se-   selecting any one of the filters (11 to 18) to tune any TV channel using the keyboard (2) and following the process on the display (4), said tuning routine repeating with   the data of the new filter state.   4) Programmable electronic synthesizer   for collective TV antennas according to the claims   preceding statements, characterized in that in the memory device (3) for storing the data   signals, the installer can reprogram the dif-   selected filter states once the   the tuning process of all the channels is ter-   mined, all these states remaining at a discount   of the apparatus and that whatever they are trusted again.   5) programmable electronic synthesizer for collective TV antennas according to claim 1, characterized in that the microcontroller (1)   and dynamic memory (8) have   to avoid tuning in the same channel of   two filters, by means of the comparison between the   tuned and channels tuned by the other filters.