KR19980014123U - VSI system with channel auto memory - Google Patents

Abstract

The present invention relates to a VSI system having a frequency synthesizing tuning means. In the related art, this channel tuning operation is repeated because the received channel is not stored in the channel memory when the channel auto memory function is not executed in such a system. There was a cumbersome problem to be performed.

The present invention is a VSI system having a frequency synthesizing tuning means including a system microcomputer to improve such a conventional problem, and checks whether the reception time lasts for a certain time if there is a broadcast signal reception in the microcomputer or the like. In the case where the predetermined period of time persists, the user checks the time check channel memory program 100 for automatically registering the current broadcast channel in the temporary memory channel table allocated to the channel memory and the temporary memory channel registered with the time check channel memory program 100. It is to provide a VSI system having a channel automatic memory function that is equipped with a temporary memory channel search program 200 to find by using the up / down keys.

Description

VSI system with channel auto memory

The present invention relates to channel auto memory and channel auto search means in VSI system with automatic channel tuning function by frequency synthesis method, which is especially constant when auto search channel is not performed by auto search in such system. The broadcast channel can be automatically memorized according to the time broadcast reception status.

It is being designed to allow users to program and use channels and broadcasting stations in the form required by the user in a television system having a television reception function using a fully tuned tuner and an OSD screen.

For example, the VSI system having this OSD function is illustrated as shown in FIG. 1.

Here, a tuner 24 which receives a regular broadcast signal from an antenna 23 of a VSI system and performs channel tuning, and a phase which controls a phase locked loop (PLL) of the tuning signal provided by the tuner 24. Together with the lock loop circuit 25, the microcomputer 22 for controlling the BT system, the OSD circuit 31 for generating the OSD screen, the channel memory 32 of the BC system, and the remote control transmitter. Configuration including key matrix 21 for various key operations, deck 26 for recording / playback deck operation, RF converter 28, video block 29 for video signal processing, TV receiver 30, and the like. It is made up of.

In such a conventional system, channel tuning is performed by the tuning means of the frequency synthesizing method as shown in FIGS. 2 and 3. Here, the microcomputer 22 of the system control unit, the tuner 24, the IFA unit, and the video block ( The channel storage / setting operation and the like are performed together with the video processor and the like.

The frequency synthesizing means (FS) of the frequency synthesis method (FS) is a frequency of the frequency to be compared with the phase of the reference frequency (crystal oscillator (determining the reference frequency using X-tal)) (the frequency of each channel to be tuned) Local oscillation frequency) It is a method of making a precise local oscillation frequency of the desired channel l by tuning to match.

In this case, as shown in FIGS. 2 and 3, when the video signal detected by the PIF unit 47 is input to pin 4 of the video processor TA 8605N 48, a signal separated by pin 25 is input. It is input to pin 3 of the synchronous detection IC (LM 567C) of the PIF unit 47. Then, it compares with the reference frequency (fo = 15734 Hz) of RC connected to pins 5 and 6 and outputs a logic 0 signal to the microcomputer 41 if it matches.

By the level of this signal (logic 1 or 0), the microcomputer 41 determines the presence / absence of the synchronization signal and executes the tuning operation.

In addition, the microcomputer 41 and the PLEL Icy 43 on the tuner 42 side perform the following operations to perform the broadcast tuning.

That is, 18 bits of data from the microcomputer 41 are transmitted to the PL Ish 43, and the 18 bits of data input to the PL Ish 43 are the first 4 bits if Band select switch data (4 bits in arm type), the upper 9 bits of the next 14 bits are input to the main counter divider (10 bits in arm type), and the lower 5 bits are input to the Swallow Counter Divider. The arm oscillation frequency is 5 bits.

The 18-bit data value for each channel is stored in the channel memory by the microcomputer 41, and this data is valid only when the ENABLE terminal is logic 1.

On the other hand, the PEL Ish 43 inputs the data, enable and clock signals corresponding to the channel from the microcomputer 41 to the PEL Ish 43 at the time of channel up 1 and direct tuning. The data signal is 18 bits of serial data, and a binary code corresponding to each channel is stored in the channel memory on the microcomputer 41 side. One of the three pins of the band selection becomes a logic 0, and 12V is input to each input terminal (VL / VH / u) of the tuning circuit 44.

Fourteen bits (Band SW DATA), followed by the top 9 bits of the system's main counter and the lower four bits, are entered as a swell counter to determine the division of the programmable counter. Done.

For example, fr is the frequency in which 4 MHz is divided by 512 as the reference frequency, fs is the frequency in which the local oscillation frequency input as the comparison frequency is 8 x 32 x (M + 3/32), and fr is the oscillation frequency of the VCO (prescater input). Frequency, local oscillation frequency), and compares the output fo (local oscillation frequency) of the VCO (Vottage Contralled oscillator) with the phase divided by fs divided by the prescaler, programmable counter, etc., and the reference frequency fr (78125KHz) The converter converts the DC voltage and applies the tuning voltage of the local oscillator 45.

Then, the local oscillation frequency (fo), which changes according to the change in the VT voltage, is input back to the prescaler and phase compared with fr through the same path. In other words, the VT voltage is changed by comparing the phases by looping continuously until fr = fs.

In addition, when the desired channel is selected, the microcomputer 41 outputs 18-bit data corresponding to the channel to the PEL Ish 43, and the PEL I 43 is the local oscillation frequency (fo of the corresponding channel). ).

After 50 ms after the data is output, the microcomputer 41 determines whether or not there is a SYNC and changes the path of tuning operation as follows.

That is, when logic 0 is input to the SYNC terminal of the microcomputer 41 after data output, the window search operation is performed, and when logic 1 is input, the SYNC search operation is performed.

In the above-described synchronous search operation, the data value first output is increased by 5, and if 5 steps are increased, if the synchronization signal is not detected, the original data is decreased by 5 steps and then outputted, and the data value is increased by 5 to 5 steps. Increase.

Each time the data value changes by 1, the local oscillation frequency changes by fr x 8 (62.5KHz), so the local oscillation frequency changes by 62.5KHz x 5 = 312.5KHz at 1 step change.

If the SYNC signal is detected at any step of the SYNC search, the SYNC search operation is stopped and the window search operation is performed. On the other hand, if all the steps are swept (± 6 step sweep) and no SYNC signal is detected, the microcomputer 41 sends the first output data to the PLEL 43 as is (local oscillation frequency is fo). Fixed) Completes the tuning operation.

In the case of window search, the SYNC signal is detected, and then the data value is increased (decreased) by 1 to find the AFT window.

The change in local oscillation frequency for one step is 62.5KHz and the window search range is fo ± 1.875MHz (± 30 step). The data is incremented by 1 (by 52.5 KHz) until AFT − is detected at the SYNC signal detection frequency. Increase it by 30 steps (+ 1.875 MHz), then decrease the data by 1 to fo-1.875 MHz.

If the point where the AFT − is detected by increasing the frequency is called 'a' and the point where the AFT + is detected by the decrease of the frequency as 'b', the microcomputer 41 sends the data to the PEL Ish 43 after the optimal adjustment. Outputs to complete the AFT operation and completes the tuning operation.

At this time, the process of setting the AFT window by the microcomputer 41 is performed as follows.

i) Initial output data is in AFT WINDOW

If AFT − is detected by increasing by 1 step (62.5 KHz), it decreases by 1 step.

When AFT + is detected, step data immediately before AFT + is detected is sent to PIEL Icy 43 and the tuning is completed.

ii) Initial output data is below AFT WINDOW.

In this case, the microcomputer 41 determines that it is a logic 0 and decreases by one step. After detecting AFT −, the microcomputer 41 continues to decrease by one step to find AFT +, and when AFT + is detected, AFT + is immediately detected. The data of the previous step is sent to PLEL Icy 43 and the selection is completed.

iii) Initial output data is above the AFT WINDOW.

In this case, the microcomputer 41 determines that it is a logic 1 and increments by one step. After detecting the AFT +, the microcomputer 41 continues to increase by one step. Find it.

When AFT + is detected, the data of the step just before AFT + is detected is sent to PIEL Icy 43 and the tuning is completed.

However, if AFT + or AFT-is not detected even if the step is increased or decreased (fo ± 1.875 MHz change), the broadcast is regarded as no broadcast and the first output data (local oscillation frequency = fo) is converted to PLEL Icy 43. Output and finish tuning operation.

In addition, the AFT operation after completion of the tuning is performed when the AFT output voltage is changed by an external factor (external change such as the RF frequency of each channel sent by the broadcasting station is changed), i) When the RF frequency is larger than the original channel frequency, time; When the AFT voltage input to the timer microcomputer 41 increases and goes out of the AFT WINDOW (1.8124V), the data value sent to the PEL Ish 43 is increased by one step (62.5 KHz). Thus, as the local oscillation frequency is increased, it compensates for the RF frequency change and the AFT voltage enters the WINDOW.

ii) the RF frequency comes below the RF frequency of the original channel; When the AFT voltage input to the microcomputer 41 decreases and is out of the AFT WINDOW (1.875V), the data value sent to the PEL Ish 43 is increased by one step (62.5 KHz). Thus, the local oscillation frequency is reduced, thereby compensating for the RF frequency change and the AFT voltage enters the WINDOW.

In such a conventional system, the above-described tuner is composed of a tuning system of a frequency synthesis method, which is designed to perform a channel memory operation using an OS screen and the like with the OS part of the system.

As an example, an example of the OSD program for such a channel memory procedure is shown as follows.

Here, pressing the menu button from the system's remote control transmitter, etc.

Function 1. Clock Set 2. Programming 3. Channel Completion 4. Video Plus Preset 5. Other Functions 1 to 5 Selection Function End

The menu screen as shown above is displayed, and press 3 to set the channel from this menu screen

Channel Custom Antenna Input: General Broadcasting1. General broadcasting → Cable broadcasting 2. Auto channel fit 3. Manual channel adjustment 1 to 3 Selectable function End

When the automatic selection is pressed, the channel number is continuously changed from 02 to 69, and only the channel having the broadcast is automatically memorized, and when the memory is completed, the lower number channel is selected among the stored channels.

However, in the conventional technology, since the user must set the channel memory operation by looking at the OS screen, it is very difficult and tedious when the number of channels to be set by the user is very large.

Therefore, when such a task is not performed in the system, it is difficult to avoid the troublesome and troublesome problem because the channel tuning must be performed every time the system is powered on / off.

The purpose of the present invention is to improve the conventional problem as described above, even if the user does not remember the channel while working on the separate screen interactive OSD screen, the system automatically receives the system after receiving a certain period of time. By registering in the channel memory, it is possible to secure the convenience of using the system.

In order to realize the object of the above example, the present invention checks whether the reception time is continued for a certain time if there is a broadcast signal reception in a system microcomputer or the like. The V has a time automatic channel memory function that is equipped with a time check channel memory program for registering and a temporary memory channel finder program for searching for temporary memory channels registered with the time check channel memory program by using the user's up / down keys. It is characteristic of the SIAL system.

Hereinafter, more specific features of the present invention will be understood by describing the same in detail with the accompanying drawings.

1 is a circuit block diagram of a Video Cassette Recorder (VCR) system with a typical OSD function.

2 is a reference diagram showing an extract of the channel selection unit of the frequency synthesis method associated with FIG.

3 is a reference diagram for understanding a synchronization signal detection operation in FIG.

Figure 4 is an embodiment showing a time check channel memory program according to the present invention

5 is an embodiment of a temporary memory channel search program associated with FIG.

** Explanation of symbols on the main parts of the drawing **

22. Microcomputers Channel memory

100. Time Check Channel Memory Program

200. Temporary Memory Channel Finder Program

4 shows a time check channel memory program 100 mounted in the microcomputer 41 of FIG.

In this case, the system checks whether there is a broadcast signal in the broadcast signal reception mode (step 101), and counts the broadcast time counter if the broadcast is being received (step 102).

After that, it is checked whether the broadcast time count value N is equal to or greater than M (for example, 5 minutes) (step 103). If the broadcast time count value N is equal to or larger, it is checked whether the current broadcast channel is registered in the temporary storage channel table (step 104). If not registered, it consists of a series of processes for storing the current channel in the temporary memory channel table.

In addition, the system is provided with a temporary memory channel search program 200 as shown in FIG.

Here, in the system up / down mode (step 201), the system checks whether the channel is stored in the channel memory (step 202), and if not, checks whether the temporary storage channel number O is equal to or greater than the arbitrary number P (step 202). 203) If the number of temporary storage channels O is equal to or larger than P, the temporary storage channel tuning is started (step 204). Otherwise, the tuning operation is executed with the current channel number +1 or -1 (step 205).

If the channel is stored in step 202, a tuning process of the stored channel is performed (step 206).

According to the present invention having the above configuration, when the system receives the broadcast signal through the antenna 23 as shown in FIG. 1, the microcomputer 22 may receive the broadcast currently received through the tuner 24 and the phase lock loop circuit 25. It recognizes the presence of the alarm and drives the broadcasting time counter in the system.

When the count value of the counter has elapsed for a predetermined time M minutes (about 5 minutes), the channel number of the currently received broadcast is registered in the temporary storage channel table of the channel memory 32.

Therefore, the above operation is automatically stored in the temporary memory table while the user watches another period by turning another channel.

On the other hand, the above operation is performed in conjunction with the time check channel memory program 100 as shown in Figure 4, the system checks whether there is a broadcast signal in the reception mode of the broadcast signal, if the broadcast is being received a broadcast time counter It counts (step 101, 102).

After that, it checks whether the broadcasting time count value N is equal to or larger than M (for example, 5 minutes). If the broadcasting time count value is equal to or larger, it is checked whether the current broadcasting channel is registered in the temporary memory channel table. This is to be stored in the storage channel table (steps 103 to 105).

In addition, a channel registered with the time-checked channel memory program 100 as described above may perform channel searching through the temporary memory channel search program 200 as shown in FIG. 5.

That is, in the system up / down mode, the system checks whether the channel is stored in the channel memory, and if not, checks whether the temporary storage channel number O is equal to or greater than the arbitrary number P, and the temporary storage channel number O is P. If it is equal to or greater than 1, the temporary storage channel tuning is started. If not, the tuning operation is executed with the current channel number +1 or -1 (steps 201 to 205).

If the channel is stored in the above step, the tuning operation of the stored channel is performed (step 206).

This invention devises a channel memory automatically if the user continues watching TV for a certain time even if the user does not register the received broadcast channel while watching the interactive interactive SD screen in the VSI system having the tuning means of the frequency synthesis method. Since the channel can be registered and tuned in, the use of such a system can be conveniently secured.

Claims (1)

In a VSI system having a tuning means of a frequency synthesizing method including a system microcomputer, the microcomputer, etc., checks whether a reception time is continued for a certain time when there is a broadcast signal reception, and if it is a predetermined time, the date and time allocated to the channel memory Temporal memory channel for retrieving the time-checked channel memory program 100 which automatically registers the current broadcast channel in the memory channel table, and the temporary memory channel registered with the time-checked channel memory program 100 by using the user's up / down keys. VSI system with channel auto-memory feature characterized in that the search program 200 is mounted