RU2025906C1 - Tv channel switch - Google Patents

Abstract

FIELD: television equipment. SUBSTANCE: TV channel switch includes timer 1, manual change-over unit 2, former 3 of reading address, commutator 4, former 5 of signals "reading-recording", storage 6, input unit 7, comparator 8, former 9 of codes. EFFECT: improved automatic switching over. 2 dwg

Description

 The invention relates to television technology and can be used in television receivers.

 A device for electronic selection of programs is known, in which the provided manual control mode, the presence of tuning potentiometers and circuit-hardware redundancy limit the possibility of automatic (software) control.

 The purpose of the invention is the automatic switching of television channels and commands.

 To do this, in the switch of television channels containing a chronizer, the first output of which is connected to the input of the manual switching unit, the first and second outputs of which are connected to the inputs of the code generator of the same name, read address drivers, a switch, a read-write signal generator, a memory block are introduced an input unit, a comparator, while the second and third outputs of the chronizer are connected to the first and second inputs of the driver of the read address, respectively, the fourth output of the chronizer is connected to the first go to the read-write signal generator, and the fifth output of the chronizer is connected to the first input of the comparator, the output of the read address generator is connected to the first input of the switch, the first output of the input unit is connected to the second input of the read-write signal generator, and to the third input of the switch, and the second output of the input block is connected to the second input of the comparator, the third input (output) of the memory block and the second input of the switch, the output of the switch is connected to the first input of the memory block, its second input is connected to the output of of the read-write signal generator, the third input (output) of the memory unit is connected to the third input of the code generator and the second input of the comparator, and the output of the comparator is connected to the fourth input of the code generator.

 Figure 1 shows a structural diagram of a switch of television channels; figure 2 - timing diagrams.

 The television channel switch contains: a chronizer 1, a manual switching unit 2, a read address generator 3, a switch 4, a read-write signal generator 5, a memory unit 6, an input unit 7, a comparator 8, a code generator 9.

 Consider the operation of the switch of television channels. We bring all the procedures into the following modes: input, manual control, automatic (program) control.

1. ENTER. The mode is designed to dial and record programs for switching television channels and commands. Data entry is carried out from the input unit 7. Selected time values are dialed (Nt _pr code), corresponding codes of channel numbers (N _channel ) and commands (To _com. ). A set of program code sequences is shown in FIG. 2 (g ₁ , d ₁ - g ₂ , d ₂ , e-i). During program control, manual intervention in a given program is possible from manual control unit 2. It is stored until the next equality of current time codes N _tech and Nt, _etc., in comparator 8.

2. MANUAL MANAGEMENT. In this mode, the code N _channel is generated at the output of the code generator 9 _. (see figure 1). Switching the channel numbers is made from the manual control unit of channels 2 with a frequency of F _k (see figure 2, a).

3. AUTOMATIC (SOFTWARE) MANAGEMENT. With automatic control, the formation of code N _channel. the code former 9 is made at input 3. Before using the mode, a switching program is recorded in the memory unit 6 from the input unit 7, i.e. a number of codes N _{channel are} typed _. , Nt _Ave. , _com . The data is read according to the signals F _t (see figure 2, b). The analysis of address codes is determined by the length of the burst of pulses with a frequency f _t (see figure 2, c). Code N _ac. through the switch 4 it goes to the first input of the memory unit 6, and to the second input from the “Read-Write” signal generator 5 - “read” control signals. At the third input of the memory block 6, which in this mode works as an output, the code {Nt _pr , N _channel.pr. To _whom }. Part of the named code {N _can. , To _whom } it enters the third input of the code shaper 9, its other part Nt, _etc., goes to the first input of the comparator 8. The current time code from the chroniser 1 - Nt _tech, comes to its second input. With the coincidence of the Nt _tech codes _. with the closest value Nt, _etc., a signal is generated for the fourth input of the code generator 9, allowing the formation of corresponding N _channel values at its output _. and To _com .

Claims (1)

 A TV CHANNEL switch comprising a chronizer, the first output of which is connected to the input of a manual switching unit, the first and second outputs of which are connected to the inputs of the code shaper of the same name, characterized in that, in order to ensure automatic switching, read address shapers, a switch, a shaper are introduced into it Read-write signals, memory block, input block, comparator, while the second and third outputs of the chronizer are connected to the first and second inputs of the read address generator Accordingly, the fourth output of the chronizer is connected to the first input of the read signal shaper, and the fifth output is connected to the first input of the comparator, the output of the read address shaper is connected to the first input of the switch, the first output of the input unit is connected to the second input of the read-write signal shaper and the third the input of the switch, and the second output of the input block is connected to the second input of the comparator, the output of the switch is connected to the first input of the memory block, its second input is connected to the output of the signal driver "Read - record ", the third input of the memory block (bus" Input - output ") is connected to the third input, the formation of codes and the second input of the comparator, and the output of the comparator is connected to the fourth input of the code generator.

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