KR960013045B1 - Pulse width modulation control method - Google Patents

Abstract

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Description

Pulse Width Modulation Step Adjustment Method for Pulse Width Modulation Control Event of Television

1 is a block diagram of a pulse width modulation output device targeted by a pulse width modulation step adjusting method for a control item of a television according to the present invention.

2 is a flowchart illustrating a pulse width modulation step adjusting method for a control item of a television according to the present invention.

* Explanation of symbols for main parts of the drawings

10: key input unit 12: PWM selection unit

14: step selection unit 16: timer

18: key input determination unit 20: PWM memory unit

22: PWM check unit 24: PWM output memory unit

26: PWM output unit 28: step memory unit

The present invention relates to a pulse width modulation step adjustment method for a pulse width modulation control item of a television, and more particularly, selecting a desired pulse width modulation (PWM) control item and increasing / decreasing the pulse width modulation control item. And then press the up / down key to up / down the output of the pulse width control event, and the pulse for the pulse width modulation control event of the television such that the pulse width control event is variably up / down by the selected increment. It relates to a method for adjusting the width modulation step.

Currently, home and industrial electronic devices control the control items of the device by increasing or decreasing the signal. For example, in the case of a television, for example, the volume of the audio output, that is, the volume or brightness of the video output. To control analog level adjustment items for video and audio such as, Contrast, Color, Tint, and Balance, for example, from the matrix keys of the control panel By pressing the corresponding control item key and operating the up / down key or the up / down key of the remote controller, the output of each adjustment item was adjusted step by step to the desired target output.

On the other hand, the pulse width modulation control method for adjusting the output level through the pulse width modulation operation is adopted for such a number of control items, in the microcomputer used as a control means for a number of control items matrix of the control panel When the pulse width modulation control signal is generated based on the control code data of the pulse width modulation read from the predetermined storage means according to the key or the key operation state of the remote controller, the pulse width modulation control signal is converted into the DC voltage through the integrator. It is applied to the audio processing module for adjusting the volume of the audio signal or the image processing module for adjusting the brightness, contrast, color, tint and balance of the video signal, so that a plurality of control items can be adjusted.

However, in the pulse width modulation control method employed in such a conventional television, since the output level of each adjustment item is sequentially increased or decreased by one step, there is a problem that it takes a lot of adjustment time until the target output.

The time required for step adjustment to the target output may be a little inconvenient when used in a general household, but for example, the volume of the audio signal for each television in the output test process of the production line of the television may be reduced. However, when a large number of control items such as brightness, contrast, color, tint, and balance of an image signal have to be individually tested from minimum to maximum, it takes a great deal of time.

Accordingly, the present invention has been made in view of the above-described circumstances, and an up / down key for selecting a desired pulse width modulation control item, selecting an increase / decrease step of pulse width modulation control item, and up / down the output of the pulse width control item. Press to change the pulse width modulation event for the pulse width modulation control item of the television which can shorten the time taken to the target output by increasing the level of the pulse width control item as the selected increment step up and down. The purpose is to provide.

According to a preferred embodiment of the pulse width modulation step adjustment method for the pulse width modulation control item of the television according to the present invention to achieve the above object, according to a plurality of PWM control items for adjusting the output level of the video / audio signal In a television for selecting a selection key to increase or decrease the output level of a video / audio signal; A key selection step for selecting a desired PWM control item among a plurality of PWM control items by key operation of the plurality of selection keys, and a step selection unit for selecting an increase / decrease step for output level adjustment of the selected PWM control item A second selection step of selecting a desired increase / decrease step, a third selection step of increasing / decreasing the output level of the selected PWM control item by key operation of the increase / decrease mode key of the key input unit, and data stored in advance in the PWM output memory unit Read the first output step of checking the output level of the PWM output signal for the selected PWM control event, the increase and decrease step selected by the step selection unit to the output level of the PWM output signal for the identified PWM control event A pulse width variation of a television comprising a second output step of adding / subtracting and outputting as a PWM output signal having a level Provides pulse width modulation step adjustment method for control event.

Here, the first to the third selection step is a first step of operating a timer when the desired PWM control item is selected, and the PWM for the selected PWM control item in the state that the time value of the timer reaches a predetermined set value When the step of increasing or decreasing the output level is not selected, the second step of resetting the selection of the PWM control event, the step of increasing and decreasing the output level of the PWM control item after the setting of the step of increasing and decreasing the And a third step of resetting the selection of the PWM control event when the time value of the timer reaches a predetermined set value.

According to the present invention configured as described above, selecting the desired pulse width modulation control item, selecting the increment step of the pulse width modulation control, and pressing the increase / decrease mode (up / down key) for up / down of the pulse width control item Since the pulse width control item is up / down by the selected increase / decrease step, the output of each adjustment item can be adjusted by the selected increase / decrease step up to the desired target output.

Hereinafter, a pulse width modulation step adjusting method for a control item of a television according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a pulse width modulation output device targeted by a pulse width modulation step adjusting method for a control item of a television according to the present invention.

In the figure, reference numeral 10 is provided with a key matrix installed on a control panel on the front of a main body of an electronic device such as a television, or an operation key provided on a remote control remote controller. And a key input unit including up / down keys 10A (ie, increase / decrease mode keys) for increasing / decreasing a plurality of PWM control items for adjusting output levels of video / audio signals such as color, tint, and balance.

Also, reference numeral 12 selects a predetermined control item from among a plurality of PWM control items for adjusting the output level of the video / audio signal such as the volume of the audio signal of the television or the contrast, color, tint, and balance of the video signal. As the PWM selector, the PWM selector 12 is provided, for example, in the key matrix or the remote controller or separately installed in the apparatus, and includes a volume key 12A for selecting the volume adjustment item and a video signal. A contrast key 12B for selecting and selecting a contrast adjustment item, a color key 12C for selecting and selecting a color adjustment item for a video signal, a tint key 12D for selecting and specifying a tint adjustment item for a video signal, and And a balance key 12E for selecting and specifying a balance adjustment item of the video signal.

Here, the PWM selector 12 generates a unique PWM control item code designated for each operation of the plurality of selection keys 12A to 12E for selecting the PWM control item.

Reference numeral 14 denotes a step selector for setting a variable step of increasing / decreasing operation, i.e., a level hopping step, for a predetermined PWM control item selected by the key operation of the PWM selector 12. 14) is composed of 10-keys installed in the key matrix or the remote control or separately installed in the apparatus, and numbers manipulated to select the increase / decrease steps by the number of the numeric keys provided on the 10-keys. Generates the increase and decrease step codes assigned to the keys.

Reference candidate 16 is a timer for counting time through a clock pulse generated by reset by a key operation of the selection keys 12A to 12E for the control item of the PWM selector 12. Whether the up / down key 10A of the key input unit 10 is keyed within the predetermined time counted by the timer 16, and whether the continuous key input is performed while the up / down key 10A is keyed in the state. It is a key input determination unit for determining.

Reference numeral 20 denotes a PWM memory unit for temporarily storing a PWM control item code generated by the operation of a plurality of selection keys 12A to 12E installed in the PWM selector 12.

Reference numeral 22 denotes a step adjustment up / down key 10A of the step adjustment up / down key 10A in the key input unit 10 within a predetermined time counted by the timer 16 after the PWM control item is selected by the PWM selector 12. When the input is transmitted through the determination operation of the key input determination unit 18, the PWM control unit code stored in the PWM memory unit 20 is checked and the confirmation data according to the result of the confirmation is outputted by the PWM output unit 26. PWM check output

Further, reference numeral 28 is a step memory unit for temporarily storing the increment / decrease step code generated by the 10-key operation selection operation of the step selection unit 14, and 24 is output from the PWM output unit 26 described later. A PWM output memory for temporarily storing output level data of a current PWM output signal, that is, a PWM output signal according to a result of an up / down operation according to a predetermined selected increase / decrease step for a predetermined selected control item.

Reference numeral 26 denotes a PWM control item code inputted from the PWM confirmation unit 22, and also checks the output level data of the PWM output signal previously output and stored in the PWM output memory unit 24, and this PWM A PWM signal is output (ie, stored in the PWM output memory 24) by adding / subtracting a step of increasing or decreasing the PWM output signal corresponding to the increase / decrease step code value from the step memory 28 to the output level of the output signal. If the output level of the previous PWM output signal is P and the increase / decrease step code value is n, if the key operation state of the up / down key 10A of the key input section 10 continues with the rising operation, P + n Subtracts by Pn and subtracts Pn if the key operation state continues in the descending operation.

Next, the pulse width modulation step adjusting method in the pulse width modulation output device of the present invention configured as described above will be described in detail with reference to the flowchart of FIG.

First, a plurality of control items of the PWM selector 12, that is, a plurality of PWM control items for adjusting the output level of the video / audio signal such as the volume of the audio signal or the contrast, color, tint, and balance of the video signal In the selection keys 12A to 12E for selection, a predetermined selection key is operated to determine whether a predetermined PWM control item is selected (step S2), and as a result of the determination of step S2, the predetermined selection key is operated. If it is determined that the predetermined PWM selection item is selected by the control, the control proceeds to the next step S4, the timer 16 is operated to proceed with the counting operation, and the plurality of selection keys 12A to 12E in the PWM memory unit 20. ) Stores the PWM control item code according to the key operation.

Thereafter, the control proceeds to step S6 to determine whether a predetermined number key has been keyed among the 10-keys of the step selector 14 to select whether the step n of increasing or decreasing the PWM output is selected. If the increase / decrease step (n) of the output is not selected, in step S8, the key input determination unit 18 determines whether the time value t of the timer 16 has reached a predetermined set value t1 (for example, 3 seconds). If it has not reached yet, the process returns to step S6.

However, if it is determined that the time value t of the timer 16 reaches a predetermined set value t1 (for example, 3 seconds), the timer 16 is reset and then returned to the above-described step S2.

On the other hand, as a result of the determination in step S6, when the increment (n) is set in the step selection unit 14, the control proceeds to the next step S10 and the key input determination unit 18 is performed in the key input unit 10 It is determined whether the adjustment up / down key 10A has been operated. If the up / down key 10A has not been operated as a result of the determination in step S10, the control proceeds to step S12 to indicate the time value of the timer 16 ( It is determined whether t) has reached a predetermined set value t1 (for example, 3 seconds).

As a result of the determination in step S12, when the time value t of the timer 16 has not yet reached a predetermined set value t1 (e.g., 3 seconds), the process returns to the step S10 described above. 16) is reset, and then the process returns to the above-described step S2.

On the other hand, when the determination result of the step S10 determines that the step adjustment up / down key 10A has been operated, the key input determining unit 18 resets the timer 16 first, and the PWM confirmation unit (22) outputs confirmation data confirming the PWM control item code from the PWM storage unit 20 in accordance with the determination result of the key input determination unit 18. Accordingly, the PWM output section 26 reads the output level data of the stored PWM output signal from the PWM output storage section 24, and previously for the predetermined PWM control item selected by the PWM selector 12. Check the output level P of the output PWM output signal (step S14), and then increase / decrease step set by the step selector 14 in step S6 to the output level P of the PWM output signal in step S16. add (n) (i.e., P + n when the up / down key 10A is operated up or down) or subtract (pn when the up / down key 10A is operated down) to output do.

For example, in the case where the PWM control step for the predetermined selected PWM control item is 61 in total, when the number 2 key of the 10-keys of the step selection unit 14 is keyed, the PWM output unit 26 is set. In steps 2, 4, 8,… In this case, the time required to increase or decrease the PWM output can be significantly reduced by adjusting to a desired step of increasing / decreasing so that the level jumps by 2 steps such as 61 steps.

As described above, according to the present invention, an up / down key (increase / decrease mode key) for selecting a desired pulse width modulation control item, selecting an increase / decrease step of the pulse width modulation control item, and up / down the pulse width control item is selected. When the pulse width control item is pressed up / down by the selected increment step, the output of each adjustment item can be adjusted by the selected increment step up to the desired target output. Therefore, the time required to the target output can be significantly reduced by increasing or decreasing the PWM output.

In particular, in the output test process of the production line of the television, even if a large number of control items such as volume, brightness, contrast, color, tint, and balance must be individually tested from the minimum to the highest, the time required is remarkable. Can be reduced. This can contribute to the improvement of productivity in the production line.

Claims (2)

In the television for increasing or decreasing the output level of the video / audio signal by selecting the selection keys 12A to 12E according to the plurality of PWM control items for the output level adjustment of the video / audio signal, the plurality of the selection keys 12A Key selection operation 14 to select a desired PWM control item from among a plurality of PWM control items, and a step selector 14 for selecting an increase / decrease step for output level adjustment of the selected PWM control item. A second selection step for selecting a desired increase / decrease step (n) by a key operation; a third selection for increasing / decreasing an output level of the selected PWM control item by key operation of the increase / decrease mode key 10A of the key input unit 10; Step, the first output step of reading the data stored in advance in the PWM output memory unit 24 to check the output level (P) of the PWM output signal for the selected PWM control event, for the identified corresponding PWM control event PWM output signal output level (P) And a second output step of adding / subtracting the increase / decrease step (n) selected by the step selector (14) and outputting it as a PWM output signal having a level increased or decreased by the increase / decrease step (n). A pulse width modulation step adjustment method for a pulse width modulation control event of a television. 2. The method of claim 1, wherein the first to third selection steps include a first step of operating a timer when a desired PWM control item is selected, and the selected PWM control in a state in which the timer value reaches a predetermined set value. If the increase / decrease step (n) of the PWM output level for the item is not selected, the second step of resetting the selection of the PWM control item, the increase / decrease step (n) is set, and then to the output level of the PWM control item. And a third step of resetting the selection of the PWM control event when the time value of the timer reaches a predetermined set value when no increase / decrease operation is selected. Pulse width modulation step adjustment method for the.