JPH11289496A - Characteristic compensation device for television transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a characteristic compensation device for a television transmitter that stores pluralities of compensation values of the characteristic compensation device to a memory in advance in a table form and reads a proper compensation value table from the memory when the operating state of the television transmitter is changed so as to apply optimum characteristic compensation. SOLUTION: Pluralities of compensation values for a power amplifier or the like in the characteristic compensation device are stored in advance in a table form, and in the case that a deterioration characteristic changes due to the selection of another power amplifier or the like, a proper compensation value (compensation table) is read from the memory 8 and set again totally. Thus, the characteristic compensation device for the television transmitter is obtained, where the compensation value is selected easily in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a characteristic compensation device used for a television transmission device.

[0002]

2. Description of the Related Art In general, a television transmitting apparatus has a VH
In order to emit television waves from ground waves such as F and UHF from an antenna, various facilities are required. In particular, in transmission, it is required to stably provide a high-quality radio wave to a viewer to improve image quality, and a characteristic compensating device is known as one of the facilities for this purpose.

[0003] This characteristic compensating device compensates for distortion generated in the output of various circuits, respectively.
One is a circuit that compensates for distortion characteristics generated in the output of an electric amplifier or the like. This compensation circuit, when distortion occurs due to the tendency of the output characteristics of the power amplifier, a circuit having a characteristic opposite to the characteristic of the distortion is arranged in the front stage, and the input signal input to the power amplifier is: The distortion generated by the output characteristics of the power amplifier is to generate an input signal having a distortion in the reverse direction to cancel the distortion generated by the output characteristics of the power amplifier.

[0004]

In the above-described television broadcasting apparatus, if the system operates stably, a characteristic compensating device is first set and adjusted, and thereafter, in principle, adjustment is performed. No need to do.

However, in an actual television transmitting device,
A backup power amplifier is provided so that broadcasting will not be interrupted if the power amplifier fails. When the power amplifier is switched from a currently used one to a spare one for some reason, the signal deterioration state of the power amplifier often changes, and the setting value of the characteristic compensator does not need to be reset. Not be.

For example, in the case of a television transmitting apparatus having a configuration in which a solid-state power amplifier is used as a working power amplifier and a spherical power amplifier is used as a standby power amplifier, a solid-state and a spherical type are used. The deterioration characteristics of the power amplifier are different, and it is necessary to reset the compensation of the characteristic compensator.

Further, when the power amplifier is affected by a change in ambient temperature, the deterioration characteristics of a signal change. Therefore, depending on the region, the signal deterioration characteristics of the power amplifier may change due to the temperature difference between summer and winter. In such a case, it is necessary to set the compensation of the characteristic compensator again so as to match the current deterioration characteristic.

Therefore, according to the present invention, a plurality of compensation values of the characteristic compensation device are stored in a table in a table in advance, and when the operation state of the television transmission device changes, a suitable compensation value table is read from the memory. It is an object of the present invention to provide a television transmitter characteristic compensation device that performs optimal characteristic compensation.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a characteristic compensating device mounted on a television transmission device, wherein a transmission signal output by a component that constitutes and drives the television transmission device is provided. A compensating signal having a characteristic opposite to the characteristic of the degraded signal included in the compensation signal, and multiplying the transmission signal by the characteristic compensating means to remove the degraded signal; and a compensation used by the characteristic compensating means to generate the compensated signal. A compensation setting value storage unit that tabulates the setting values and stores a plurality of them in association with each of the constituent parts, and a compensation setting value corresponding to the constituent part to be driven from the compensation setting value storage means, and sets the compensation setting value in the characteristic compensation means And selecting a compensation setting value associated with the component when the deterioration characteristic differs due to the switching of the component. Reading from the means, to provide a characteristic compensation apparatus of a television transmitter for resetting the set value of the characteristic compensation means collectively.

[0010] The characteristic compensating device of the television transmitting apparatus thus configured tabulates in advance the compensation values of the respective items of the components (power amplifier and the like) of the characteristic compensating device and stores the compensation values in the compensation set value storage means in a plurality of ways. If the deterioration characteristic differs from the current state due to switching of the power amplifier or the change in the surrounding temperature, the compensation value (compensation table) corresponding to the power amplification means or the temperature is read out, and the characteristic compensation is performed collectively. It is reset to the means.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an example of a schematic configuration of a characteristic compensating device for a television transmitter according to an embodiment of the present invention.

The television transmitting apparatus according to the present embodiment determines a characteristic compensating apparatus 1 for compensating a power amplifier (PA) and the like, a modulator 2 for modulating a television signal into a transmission signal, and a modulated signal. Frequency conversion 3 for frequency conversion to a converted channel, and a solid-state PA for amplifying the frequency converted signal
(Active) 5, a spherical PA (spare) 6 provided as a backup power amplifier when the solid PA (active) 5 fails, and a solid PA (active) or spherical PA (spare). The switching unit 4 is capable of switching either of them by remote control or manually.

As described above, the characteristic compensating device 1 transforms the signal in advance in the reverse direction by the amount of distortion that causes the signal to degrade for some reason, and then inputs the signal to the power amplifier, and finally outputs a normal signal without distortion. Is output.

The characteristic compensating apparatus 1 sets compensation values (compensation values) in a table in which correction values are set for each compensation item.
8 in advance, a compensator 7 for performing compensation based on the read compensation values (compensation values A to D), and a selection unit 9 for selecting at least one compensation data from the memory 8. , And a control unit 10 that controls switching of the selection unit 9 and outputs the selected compensation data to the compensator 7.

The compensation value stored in the memory 8 is divided into a plurality of items such as luminance linearity in the case of a power amplifier, and a numerical value is set for each item. Since the characteristics of the distortion included in the output differ for each power amplifier, a suitable compensation value is set for each power amplifier, and a table is stored for each power amplifier to store data for a plurality of power amplifiers. Further, the compensation value is set for each power amplifier with reference to an arbitrary standard temperature, but when the power amplifier further changes the deterioration signal due to a change in ambient temperature, the compensation value at each ambient temperature is set. You have set.

These numerical values to be set may be set arbitrarily by using keys or the like, or a plurality of numerical values are registered in advance, and may be set by selecting from among them. The operation of the thus configured characteristic compensation device of the present embodiment will be described.

Normally, in a television transmitter, when the power amplifier is switched from working to standby, the signal deterioration state may change for each power amplifier. Therefore, the compensation value A of the solid-state PA (working) 5 and the spherical P
The compensation value B of A (preliminary) 6 is stored in a table. During normal operation, the controller 10 controls the selection unit 9 to select and output the compensation value A from the memory 8 to operate the television transmission device.

If a problem occurs in the solid-state PA (working) 5 or the need for maintenance arises, the solid-state PA (working) 5 must be stopped. At this time, the switch 4 is switched from the solid type PA 5 to the spherical type P 5.
The selection unit 9 is switched from the compensation value A to the compensation value B under the control of the controller 10 simultaneously.
At the same time as the switching, the compensation value B is read from the memory 8 to the compensator 7 and reset.

With these switching operations, the spherical P
A6 can be used to operate the television transmission device without difficulty. Similarly, even when the deterioration characteristic of the power amplifier changes due to the temperature change, the memory 8
If the summer compensation value (compensation value C) and the winter compensation value (compensation value D) are stored in the controller 10, the controller 10 switches the compensation value C and the compensation value D every season, and the compensation device 7 That is, the value may be read and set.

As described above, according to the present invention, a characteristic compensating apparatus for compensating for the output of a power amplifier of a television transmitting apparatus stores a compensation value corresponding to a change in state in advance, and performs switching and temperature difference. Therefore, even if the operation state of the power amplifier changes, if the compensation value suitable for the characteristic is read out and reset collectively, the switching can be easily performed in an extremely short time as compared with the related art.

Therefore, if the tables of the compensation values of the solid-state and spherical power amplifiers or the tables of the compensation values whose state has changed due to the temperature difference are stored in a memory in advance, the solid-state and power amplifiers can be used. Switching to the spherical type can be dealt with simply by reading the compensation value corresponding to the amplifier into the characteristic compensator and resetting it collectively.

Similarly, if the characteristic changes of the power amplifier in summer and winter are stored in the memory in the same manner, it is possible to easily switch the compensation of the characteristic compensator according to the state.

[0023]

As described above in detail, according to the present invention, the compensation values of the characteristic compensating device are stored in a table in advance and stored in the memory in a plurality of ways, which is suitable when the operation state of the television transmitting device changes. By reading out the compensation values to be performed from the memory and resetting them collectively, it is possible to provide a characteristic compensating device for a television transmitter which can easily and quickly switch the compensation values.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a schematic configuration example of a characteristic compensation device of a television transmitter according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Characteristic compensation device 2 ... Modulator 3 ... Frequency conversion 4 ... Switcher 5 ... Solid-state PA (working) 6 ... Spherical PA (spare) 7 ... Compensator 8 ... Memory 9 ... Selection unit 10 ... Control unit

Claims (4)

[Claims] 1. A characteristic compensating device mounted on a television transmitting device, comprising: a compensating signal having a characteristic opposite to a characteristic of a degraded signal included in a transmission signal output by a component that constitutes and drives the television transmitting device. A characteristic compensating means for generating and multiplying the transmission signal to remove the degraded signal; and a table for compensating set values used by the characteristic compensating means to generate the compensation signal, and storing a plurality of them in association with each of the constituent parts. A compensation setting value storage means for performing the setting, and selecting and setting a compensation setting value corresponding to a component to be driven from the compensation setting value storage means and setting the compensation setting value in the characteristic compensation means. When the deterioration characteristics are different, the compensation set value associated with the component is read out from the compensation set value storage means, and the setting of the characteristic compensation means is performed. Characteristic compensation apparatus of a television transmission apparatus characterized by resetting collectively the. 2. A characteristic compensating device mounted on a television transmitting device, wherein the constituent parts are a first power amplifying circuit that drives to generate a transmission signal, and the first power amplifying circuit has an amplifying system. Differently, the first
The characteristic compensating device for a television transmitting device according to claim 1, further comprising: a second power amplifying circuit that generates the transmission signal by switching with the power amplifying circuit. 3. The compensation set value storage means of the characteristic compensation device, wherein the compensation set value is arbitrarily set in a plurality of setting items set for each of the constituent parts or from a plurality of numerical values arranged in advance. 2. The characteristic compensating device for a television transmitting device according to claim 1, wherein the characteristic compensating device is selected and set. 4. A characteristic compensating device mounted on a television transmitting device, wherein when a temperature around the component changes and a deterioration characteristic is different, a compensation setting associated with the temperature is set in the component. A characteristic compensating device for a television transmission device, wherein a value is read from said compensation set value storage means, and the set value of said characteristic compensation means is collectively reset.