JP2002280910A - Digital FPU transmitting device and digital FPU receiving device - Google Patents

Abstract

(57) [Problem] To change the length of a cable in a configuration in which a high-frequency unit and a control unit are connected by a coaxial cable in an FPU (external microwave) transmission / reception device used for relaying video and audio materials. Is corrected by a correction circuit. However, when the length changes, the signal level does not simply attenuate, the frequency characteristics of the cable change, and the signal waveform is distorted.
There has been a problem that the allowable range for changing the length of the cable is reduced. A level correction circuit that can adjust a signal level by a control signal and a variable equalizer circuit that adjusts a frequency characteristic are provided. A voltage detection circuit is provided for detecting a drop in the DC voltage flowing through the coaxial cable. The first arithmetic unit 19 reads out and determines the cable length and the equalizer characteristic to be further corrected from the data stored in advance based on the detected voltage data, and controls the variable equalizer circuit 111 and the level correction circuit 110.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an external microwave transmitting apparatus or a receiving apparatus (FPU apparatus) used for relay transmission of video and audio materials, in which a high-frequency section and a control section are connected by a coaxial cable. Regarding what to operate.

[0002]

2. Description of the Related Art An out-of-station microwave transmitter or receiver (Fie) used for relay transmission of video and audio materials (signals).
ld Pickup Unit. FPU device)
FIG. 12 is a block diagram of a conventional transmission device similar to that disclosed in Japanese Patent Application Laid-Open No. 9-8577, which is used for connecting and operating a high-frequency unit and a control unit with a coaxial cable.
FIG. 13 shows a block diagram of the receiving apparatus. Since the configuration in FIG. 12 and the configuration in FIG. 13 are very similar, the description will be made mainly with reference to FIG. 12 to avoid redundant description. In FIG. 12, T1 is a control unit, T2 is a high-frequency unit, and 3 is a coaxial cable connecting the control unit T1 and the high-frequency unit T2. Control unit T
Reference numeral 1 denotes an IF modulator 11, a control unit power supply 12, a first synthesizer / demultiplexer 13, a first monitor / control device 14, a first audio modulator / demodulator 15, an AGC circuit 16, and a fixed equalizer circuit 17. And The high-frequency unit T2 includes a second synthesizer / demultiplexer 21, a high-frequency circuit 22, a high-frequency unit power supply 23,
It has a second monitoring and control device 24 and a second audio modem 25.

Next, the operation will be described. In the control unit T1, the IF modulator 11 converts the input video / audio signal into 13
Convert to 0 MHz IF signal. The control unit power supply 12 converts the input AC voltage or DC voltage into a predetermined DC voltage. The first synthesizer / demultiplexer 13 includes an IF signal from the IF modulator 11, a DC voltage from the control unit power supply 12, a supervisory control signal from the first supervisory controller 14 and a first audio modulator / demodulator 1.
5 is multiplexed with the audio signal from the transmitter 5 and transmitted as a frequency multiplexed signal through the coaxial cable 3 to the high frequency section T2. In the high frequency unit T2, the second combiner / demultiplexer 21 separates the frequency multiplexed signal transmitted from the control unit through the coaxial cable 3 into an IF signal, a DC voltage, a monitoring control signal, and an audio signal. The high frequency circuit 22 converts the frequency of the IF signal separated by the second combiner / splitter 21 into an SHF band signal, amplifies the signal to a predetermined power, and outputs the signal. The high-frequency power supply 23 converts the DC voltage separated by the second combiner / splitter 21 into a predetermined voltage.

The second supervisory control device 24 receives the supervisory control signal separated by the second combiner / demultiplexer 21 and returns a response signal to the control unit via the second combiner / demultiplexer 21. I do. The second audio modulator / demodulator 25 includes the second synthesizer / demultiplexer 21.
The demodulated audio signal is demodulated and output as audio, and the input audio is modulated and transmitted to the control unit via the second synthesizer / demultiplexer 21. The difference between the transmitting apparatus in FIG. 12 and the receiving apparatus in FIG. 13 is that the transmitting apparatus converts an IF signal into an SHF band signal, whereas the receiving apparatus converts an SHF band signal into an IF signal. Therefore, in the receiving device, the IF demodulator 1 is used instead of the IF modulator 11 of the transmitting device.
8

In such a transmitting apparatus or receiving apparatus, the cable length L of the coaxial cable 3 varies within a certain range (for example, 50 to 200 m) in its operation. Therefore, the cable attenuation and the frequency characteristics change due to the difference in the cable length, and the receiving voltage of the high-frequency power supply 23 naturally affects the input level and the frequency characteristics of the IF signal. Conventionally, a step-up by the high-frequency unit power supply 23 or adjustment of the power supplied to the high-frequency circuit 22 is performed to reduce the received voltage, and an AGC circuit 16 is provided to change the level of the IF signal. Further, since the equalizer circuit 17 having semi-fixed specifications is provided for correcting the frequency characteristics, the equalizer circuit 17 can be used without adjustment within a fixed cable length change range determined by the adjustment setting of these correction circuits. However, beyond this range, readjustment is required according to the length of the cable. In other words, there is a problem that the change range of the cable length usable without adjustment is narrow.

[0006]

In the conventional FPU transmitting apparatus and receiving apparatus, the fluctuation of the power supply voltage due to the change of the cable length L of the coaxial cable connecting the control section and the high frequency section and the fluctuation of the level of the IF signal are as follows. Although the correction is automatically performed, a manual adjustment is required for the change in the frequency characteristic, and therefore, there is a problem that the range of the cable length that can be handled without adjustment is small.

[0007]

An FPU transmitting apparatus according to the present invention is provided with an IF modulator for converting an input signal into an IF signal, a level correction circuit for correcting the level of the IF signal with a given signal, and a level converter. A variable equalizer circuit having a frequency characteristic that changes in accordance with the signal and passing the IF signal;
A first combining unit that combines a power supply unit that outputs a predetermined DC voltage, an IF signal that has passed through a variable equalizer circuit, and a DC voltage, outputs the combined signal to a coaxial cable, and separates data transmitted from a high-frequency unit. A control unit including a duplexer, and a first arithmetic unit that supplies a signal to a level correction circuit and a variable equalizer circuit based on the separated data;
A second combiner / demultiplexer that separates the combined signal input via the coaxial cable into an IF signal and a DC voltage and transmits given data as a response signal to a control unit; A high-frequency circuit that outputs the signal as a signal, a high-frequency power supply that supplies the separated DC voltage to the high-frequency circuit, a voltage detection circuit that detects the level of the separated DC voltage, and a second synthesis and demultiplexing process using the voltage as data. A high-frequency unit having a second arithmetic unit to be provided to the unit, and a coaxial cable connecting the control unit and the high-frequency unit.

Further, the FPU receiving apparatus of the present invention has a high frequency circuit for amplifying an input SHF signal as an IF signal, and superimposes data given to the IF signal as a response signal and transmits the signal to a control unit via a coaxial cable. A second synthesizer / demultiplexer that separates the input DC voltage, a high-frequency power source that supplies the separated DC voltage to the high-frequency circuit, a voltage detection circuit that detects the level of the separated DC voltage, A high-frequency unit having a second arithmetic unit for applying the voltage to the second combiner / splitter as data, a power supply unit for outputting a predetermined DC voltage, and data from an IF signal transmitted from the high-frequency unit via a coaxial cable. And DC
A first combiner / demultiplexer that outputs a voltage to a coaxial cable, a variable equalizer circuit that has a frequency characteristic that changes according to a given signal and passes an IF signal, and adjusts the level of the IF signal with the given signal. A level correction circuit for correcting,
A control unit including an IF demodulator for demodulating an input IF signal into an image / audio signal, and a first arithmetic unit for supplying a signal to a level correction circuit and a variable equalizer circuit based on the separated data; A digital FPU receiving device comprising a coaxial cable for connecting a digital signal processor and a digital signal processor.

Also, an FPU transmitting apparatus according to the present invention comprises: an IF modulator for converting an input signal into an IF signal; a level correction circuit for correcting the level of the IF signal by a given signal; A variable equalizer circuit having a changing frequency characteristic and allowing an IF signal to pass therethrough;
A first combining / demultiplexing unit that combines a power supply unit that outputs a C voltage, an IF signal via a variable equalizer circuit, and a DC voltage, outputs the combined signal to a coaxial cable, and separates data transmitted from a high-frequency unit. A control unit having a first arithmetic unit for providing a signal to a level correction circuit and a variable equalizer circuit based on the separated data, and a first monitoring and control unit for transmitting and receiving a control signal to and from a high-frequency unit; The combined signal input via the cable is converted into an IF signal and DC
A second synthesizer / demultiplexer for transmitting the given data to the control unit as a response signal, a high-frequency circuit for outputting the separated IF signal as a SHF signal, and a separated DC voltage. A high-frequency power supply for supplying to the high-frequency circuit, a second monitoring and control device for transmitting and receiving a control signal between the control device, a level detection circuit for detecting a level of the control signal received by the second monitoring and control device, , As a data, to a second combiner / demultiplexer, and a coaxial cable connecting the control unit and the high frequency unit.

Further, the FPU receiving apparatus of the present invention has a high-frequency circuit for amplifying an input SHF signal as an IF signal, and superimposes data given to the IF signal as a response signal and transmits the signal to a control unit via a coaxial cable. A second combiner / separator that separates the input DC voltage, a high-frequency power supply that supplies the separated DC voltage to the high-frequency circuit, and a second monitor that transmits and receives a control signal between the control unit and the control unit. A high-frequency section having a control device, a level detection circuit for detecting a level of a control signal received by the second monitoring and control device, and a second arithmetic device for providing the level to the second synthesis and duplexer as data; A power supply unit for outputting a DC voltage, and a first combining / dividing device for separating data from an IF signal transmitted from a high-frequency unit via a coaxial cable and outputting the DC voltage to the coaxial cable A variable equalizer circuit for passing the IF signal has a frequency characteristic that varies in response to a given signal, the level correction circuit for correcting the levels of a given signal by the IF signal, the input IF signal image-
A control unit having an IF demodulator for demodulating to an audio signal, a first arithmetic unit for supplying a signal to a level correction circuit and a variable equalizer circuit based on the separated data, and a coaxial cable for connecting the high frequency unit and the control unit. It is provided.

Also, an FPU transmitting apparatus according to the present invention comprises an IF modulator for converting an input signal into an IF signal, a level correction circuit for correcting the level of the IF signal by a given signal, A variable equalizer circuit having a changing frequency characteristic and allowing an IF signal to pass therethrough;
A first combining / demultiplexing unit that combines a power supply unit that outputs a C voltage, an IF signal via a variable equalizer circuit, and a DC voltage, outputs the combined signal to a coaxial cable, and separates data transmitted from a high-frequency unit. A control unit having a first arithmetic unit for providing a signal to a level correction circuit and a variable equalizer circuit based on the separated data, and a first monitoring and control unit for transmitting and receiving a control signal to and from a high-frequency unit; The combined signal input via the cable is converted into an IF signal and DC
A second synthesizer / demultiplexer that separates the given data as a response signal to the control unit while separating the voltage and audio signals, a high-frequency circuit that outputs the separated IF signal as an SHF signal, A high-frequency power supply for supplying a voltage to the high-frequency circuit; a level detection circuit for detecting the level of the separated audio signal;
It comprises a high-frequency unit having a second arithmetic unit for providing the signal to the combining and splitter, and a coaxial cable for connecting the control unit and the high-frequency unit.

Further, the FPU receiving apparatus of the present invention includes a high-frequency circuit for amplifying an input SHF signal as an IF signal, superimposing given data as a response signal on the IF signal, and converting an input DC voltage. Separate and further I
A second synthesizer / demultiplexer for separating the audio signal included in the F signal, a high-frequency power supply for supplying the separated DC voltage to the high-frequency circuit, a level detection circuit for detecting the level of the separated audio signal, A high-frequency unit having a second arithmetic unit for giving the level as data to a second combining / dividing device, a predetermined D
A power supply for outputting a C voltage; a first combiner / demultiplexer for separating data from an IF signal transmitted from a high frequency unit via a coaxial cable and outputting a DC voltage to the coaxial cable; A variable equalizer circuit having a frequency characteristic that varies according to the frequency of the IF signal, a level correction circuit for correcting the level of the IF signal by a given signal, and demodulating the input IF signal into an image / audio signal. A control unit having an IF demodulator, a first arithmetic unit for providing a signal to a level correction circuit and a variable equalizer circuit based on the separated data, and a coaxial cable for connecting the high frequency unit and the control unit. .

In the FPU transmitting apparatus according to the present invention, the control
It is provided with an AGC circuit for controlling the level of the F signal to a predetermined value, and a changeover switch for selecting use or non-use of the AGC circuit based on a command from the arithmetic unit.

According to the FPU receiving apparatus of the present invention, the control unit
It is provided with an AGC circuit for controlling the level of the F signal to a predetermined value, and a changeover switch for selecting use or non-use of the AGC circuit based on a command from the arithmetic unit.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 shows a block diagram of a transmitting apparatus according to the present invention. In FIG.
Denotes a control unit, 102 denotes a high-frequency unit, and 3 denotes a coaxial cable connecting the control unit 101 and the high-frequency unit 102. Control unit 10
Reference numeral 1 denotes an IF modulator 11, a control unit power supply 12, a first synthesizer / demultiplexer 13, a supervisory controller 14, a first audio modulator / demodulator 15, a first arithmetic unit (CPU) 19, a level It has a correction circuit 110 and a variable equalizer circuit 111. The high-frequency unit 102 includes a second synthesizer / demultiplexer 21, a high-frequency circuit 22, a high-frequency unit power supply 23,
4, a second audio modulator / demodulator 25, and a voltage detection circuit 26
And a second arithmetic unit (CPU) 27.

Next, the operation will be described. Note that signals and data (except for IF signals and SHF band signals) referred to in the following description are all digital signals and digital data. In the control unit 101, the IF modulator 11 converts an input video signal, audio signal, or the like into an IF signal. The control unit power supply 12 converts the input AC voltage or DC voltage into a predetermined DC voltage. The first combiner / splitter 13 is I
The IF signal from the F modulator 11 and a predetermined DC voltage from the control unit power supply 12 are combined and sent to the high frequency unit 102 through the coaxial cable 3 as a combined signal. In the high frequency unit 102, the second combiner / splitter 21 separates the combined signal sent from the control unit 101 through the coaxial cable 3 into an IF signal and a DC voltage. The high frequency power supply 23 receives the DC voltage separated by the second combiner / splitter 21, converts the DC voltage into a predetermined voltage, and supplies the voltage to each circuit inside the high frequency unit 102.

The DC voltage separated by the second synthesizer / demultiplexer 21 is detected by a voltage detection circuit 26, and the second arithmetic unit (C
PU) 27 to convert the data into detection data. This detection data is transmitted to the monitoring control device 24 and returned to the control unit 101 as one item of the response signal. The monitoring control device 14 of the control unit 101 extracts the detection data from the response signal and transmits it to the arithmetic unit (CPU) 19. Arithmetic unit (CPU)
Reference numeral 19 determines the control amounts of the level correction circuit 110 and the variable equalizer circuit 111 based on the detected data, and controls these to optimum values.

Next, a method of determining the control amount will be described. As shown in FIG. 2, first, the length L of the coaxial cable 3 is converted from the magnitude of the DC voltage detected by the detection data (the coaxial cable 3 has a predetermined standard). Corresponding to the length L, the correction amount of the level correction circuit 110 and the setting contents of the variable equalizer circuit 111 are determined in advance and stored in a storage circuit (not shown) of the first arithmetic unit 19. Let it be. The level correction amount is as shown in FIG. 3, for example, and the correction of the variable equalizer circuit is as shown in FIG. 4, for example. The first arithmetic unit 19 reads a correction amount corresponding to the detected data from the storage circuit and determines a control amount.

In the above description, the first arithmetic unit 19 calculates the cable length from the data. However, as long as the data for controlling the level correction circuit 110 and the variable equalizer circuit 111 can be obtained, only the data can be obtained. Needless to say, the cable length is not always necessary. Also, the first
A part of the operation of the arithmetic unit 19 may be shared by the second arithmetic unit 19. Also, the output has been described as an SHF band signal, but it can be used for communication of a higher frequency.

Embodiment 2 FIG. 5 shows a block diagram of a receiving apparatus according to the present invention. 1 is similar to the configuration of the transmitting apparatus according to the first embodiment shown in FIG. 1, but because it is a receiving apparatus, it has an IF demodulator 18 and the direction of the flow of image and audio signals is The direction is opposite to 1. However, since the direction of the flow of the control signal for controlling the level correction circuit 110 and the variable equalizer circuit 111 is the same as that in FIG. 1, the detailed description is omitted. 5, reference numeral 201 denotes a control unit, 202 denotes a high-frequency unit, 3 denotes a control unit 201 and the high-frequency unit 2
02 is a coaxial cable. The control unit 201
IF demodulator 18, control unit power supply 12, first synthesizer / demultiplexer 13, first monitor / control device 14, first audio modulator / demodulator 15, first arithmetic unit (CPU) 19, level correction It has a circuit 110 and a variable equalizer circuit 111. The high frequency unit 202 includes a second synthesizer / demultiplexer 21, a high frequency circuit 22, a high frequency unit power supply 23, a second monitoring and control device 24, a second audio modulator / demodulator 25, a voltage detection circuit 26, and a second arithmetic unit. (CPU) 27. In the high frequency section 202, the D separated by the second combining / splitter 21
The C voltage is detected by a voltage detection circuit 26 and converted into detection data by a second arithmetic unit (CPU) 27. The detection data is transmitted to the second monitoring and control device 24 and returned to the control unit 201 as one item of the response signal. The first monitoring and control unit 14 of the control unit 201 extracts the detection data from the response signal and transmits it to the first arithmetic unit (CPU) 19. The first arithmetic unit (CPU) 19 determines the control amounts of the level correction circuit 110 and the variable equalizer circuit 111 based on the detected data.
These are controlled to optimal values.

Embodiment 3 In the first and second embodiments, a decrease in DC voltage due to the coaxial cable 3 is detected. However, D within the variation range of the coaxial cable 3
The degree of the decrease in the C voltage (rate of change) is not so large as shown in FIG. In addition, the current consumption in the high-frequency section changes every moment due to the change of the signal to be handled, so that the cable length cannot always be measured accurately. Therefore, by capturing the attenuation of the signal that changes according to the length of the coaxial cable 3, there is a possibility that accurate data closer to the actual situation can be obtained. FIG. 6 shows a block diagram of a transmitting apparatus according to Embodiment 3 of the present invention. 103 is a control unit, and 104 is a high frequency unit. In the high frequency unit 104,
A supervisory control signal level (digital signal level) is detected by a supervisory control signal level detecting circuit 28 (hereinafter referred to as a level detecting circuit), and the second arithmetic unit (CPU) 27 detects the second level.
The DC voltage separated by the combiner / splitter 21 is converted into the same detection data (or coaxial cable length L) as detected by the voltage detection circuit 26. The relationship between the monitoring control signal level detected by the level detection circuit 28 and the DC voltage level to be converted is as shown in FIG. 7, for example. As a precaution, since the monitoring control signal is a digital signal, its signal level does not change according to the amount of the monitoring control signal. The operation other than the above is described in the first embodiment.
Therefore, detailed description is omitted.

Embodiment 4 FIG. 8 shows a block diagram of a receiving apparatus according to an embodiment in which the invention of Embodiment 3 is applied to the receiving apparatus. The high-frequency unit 204 detects the monitoring control signal level by the level detection circuit 28, and detects the DC voltage separated by the second combining / demultiplexer 21 by the second arithmetic unit (CPU) 27 by the voltage detection circuit 26. It is converted to the same detection data (or to the coaxial cable length L). Operations other than those described above are the same as those in the second embodiment, and a detailed description thereof will be omitted.

Embodiment 5 The signal used for measuring the cable length is not limited to the monitoring control signal shown in the third or fourth embodiment, and other signals can be used. FIG. 9 shows a block diagram of a transmitting apparatus according to Embodiment 5 of the present invention. The high-frequency unit 106 detects an audio signal level (the level of a digital signal) with an audio signal level detection circuit 29 (hereinafter, a level detection circuit), and converts it into detection data with a second arithmetic unit (CPU) 27. Here, since the level of the actual audio signal is detected, it has been described in the first and second embodiments.
The actual state is higher than the method of detecting the DC voltage separated by the second combiner / demultiplexer 21 by the voltage detection circuit 26 and the method of detecting the monitoring control signal level described in the third and fourth embodiments. And accurate detection close to. As a precaution, since the audio signal is not an analog signal but a digital signal, its signal level does not change according to the magnitude of the audio signal. The other parts are the same as those of the first embodiment, and thus the detailed description is omitted.

Embodiment 6 FIG. FIG. 10 is a block diagram of a receiving apparatus when the fifth embodiment is applied to the receiving apparatus. In the high frequency unit 206, the audio signal level is detected by the level detection circuit 29, and is converted into detection data by the second arithmetic unit (CPU) 27. The other parts are the same as those of the second embodiment, so that the detailed description will be omitted.

Embodiment 7 In the field where the FPU transceiver is actually used, the coaxial cable 3 is prepared in several lengths in combination with the set of the transmitter and the receiver, and the length is cut each time according to the distance. Shrinking is not common. Therefore, Embodiment 1
In most cases, method 6 can be used. However, it is not always necessary to exceptionally require a very long case. FIG. 11 shows a configuration of the seventh embodiment that can cope with such a case.

In the figure, reference numeral 107 denotes a control unit of the transmitting device;
108 is a high-frequency unit of the transmission device. Reference numeral 99 denotes a signal switching circuit for selecting whether to send the output signal of the IF modulator 11 directly to the level correction circuit 110 or via the AGC circuit 16. Signal switching circuit 99
Is switched based on a command from the first arithmetic unit 19. When the correction can be performed by the level correction circuit 110, the switching circuit 99 is switched to a side that does not pass through the AGC circuit 16, but if the correction cannot be performed long enough that the cable length deviates from the correction range of the level correction circuit 110. When the first arithmetic unit 19 determines, the switching circuit 99
Is switched to the side via the AGC circuit 16. Thereby, for example, the level correction amount of FIG. 3 can further expand the correction range, and the range of the applicable cable length can be further expanded. Although the transmitting device is illustrated here for convenience of description, a similar configuration is possible for the receiving device. Further, the present invention can be applied to the third to sixth embodiments.

[0027]

As described above, the FPU of the present invention
Since the transmitter and the FPU receiver use a variable equalizer circuit that corrects a change in frequency characteristics due to a change in the length of the coaxial cable, the change in length can be larger than that in the conventional voltage correction alone. Can be adjusted without adjustment.

Further, since the length of the coaxial cable is measured by the fluctuation of the level of the monitoring control signal, more accurate measurement than before and more accurate correction based on the measurement result can be performed.

Further, since the length of the coaxial cable is measured by the fluctuation of the level of the audio signal, more accurate measurement than before and more accurate correction based on the measurement result can be performed.

Further, the AGC circuit is used in combination, the fine correction is performed by the level correction circuit, and the rough correction is performed by the AGC circuit.
Since it is performed by a circuit, it is possible to cope with a wider change in cable length.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an FPU transmitting apparatus according to a first embodiment of the present invention.

FIG. 2 is a characteristic explanatory diagram illustrating operation characteristics of FIG. 1;

FIG. 3 is a characteristic explanatory diagram illustrating operation characteristics of FIG. 1;

FIG. 4 is a characteristic explanatory diagram for explaining the operation characteristics of FIG. 1;

FIG. 5 is a configuration diagram of an FPU receiving apparatus according to a second embodiment of the present invention.

FIG. 6 is a configuration diagram of an FPU transmitting apparatus according to Embodiment 3 of the present invention.

FIG. 7 is a characteristic explanatory diagram for explaining the operation of FIG. 6;

FIG. 8 is a configuration diagram of an FPU receiving apparatus according to a fourth embodiment of the present invention.

FIG. 9 is a configuration diagram of an FPU transmitting apparatus according to Embodiment 5 of the present invention.

FIG. 10 is a configuration diagram of an FPU receiving apparatus according to a sixth embodiment of the present invention.

FIG. 11 is a configuration diagram of an FPU transmitting apparatus according to a seventh embodiment of the present invention.

FIG. 12 is a configuration diagram of a conventional FPU transmission device.

FIG. 13 is a configuration diagram of a conventional FPU receiving apparatus.

[Explanation of symbols]

101, 103, 105, 107, control section of T1 transmission apparatus, 102, 104, 106, 108, high frequency section of T2 transmission apparatus, 3, coaxial cable, 11 IF modulator, 12 control section power supply, 13 first synthesis / Duplexer,
14 1st supervisory control device, 15 1st audio modem,
18 IF demodulator, 19 first arithmetic unit (CPU),
21 second synthesizer / demultiplexer, 22 high frequency circuit, 23
High frequency power supply, 24 second monitoring and control device, 25 second
Voice modulation / demodulation device, 26 voltage detection circuit, 27 second arithmetic unit (CPU), 28 level detection circuit for monitoring control signal, 29 level detection circuit for audio signal, 110 level correction circuit, 111 variable equalizer circuit.

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (8)

[Claims] An IF modulator for converting an input signal into an IF signal, a level correction circuit for correcting the level of the IF signal by a given signal, and a frequency characteristic that changes according to the given signal. A variable equalizer circuit for passing the IF signal, a power supply unit for outputting a predetermined DC voltage,
A first combiner / demultiplexer that combines the IF signal and the DC voltage via the variable equalizer circuit, outputs the combined signal to a coaxial cable, and separates data transmitted from a high-frequency unit; A control unit for providing the signal to the level correction circuit and the variable equalizer circuit based on the data based on the combined data;
A second synthesizing unit that separates an F signal and a DC voltage and transmits given data as a response signal to the control unit;
A duplexer, a high-frequency circuit that outputs the separated IF signal as an SHF signal, a high-frequency unit power supply that supplies the separated DC voltage to the high-frequency circuit,
A high-frequency unit having a voltage detection circuit for detecting the level of the C voltage, and a second arithmetic unit for applying the voltage as data to the second combining and splitter; the coaxial connecting the control unit and the high-frequency unit A digital FPU transmission device comprising a cable. 2. A high-frequency circuit for amplifying an input SHF signal as an IF signal, superimposing data given to the IF signal as a response signal, transmitting the response signal to a control unit via a coaxial cable, and inputting a DC signal. A second combiner / separator for separating a voltage, a high frequency power supply for supplying the separated DC voltage to the high frequency circuit, a voltage detection circuit for detecting the level of the separated DC voltage, A high-frequency unit having a second arithmetic unit for giving to the second combiner / splitter, a power supply unit for outputting a predetermined DC voltage, and the data from an IF signal transmitted from the high-frequency unit via the coaxial cable. And a first synthesizer / demultiplexer that outputs the DC voltage to the coaxial cable, and a frequency synthesizer that has a frequency characteristic that changes according to a given signal and passes the IF signal. A variable equalizer circuit for adjusting the level of the IF signal according to a given signal, an IF demodulator for demodulating an input IF signal into an image / audio signal, and a signal based on the separated data. A first signal providing the signal to the level correction circuit and the variable equalizer circuit;
A digital FPU receiving device, comprising: a control unit having an arithmetic unit; and the coaxial cable connecting the high-frequency unit and the control unit. 3. An IF modulator for converting an input signal into an IF signal, a level correction circuit for correcting the level of the IF signal by a given signal, and a frequency characteristic that changes in accordance with the given signal. A variable equalizer circuit for passing the IF signal, a power supply unit for outputting a predetermined DC voltage,
A first combiner / demultiplexer that combines the IF signal and the DC voltage via the variable equalizer circuit, outputs the combined signal to a coaxial cable, and separates data transmitted from a high frequency unit; A control unit comprising: a first arithmetic unit that supplies the signal to the level correction circuit and the variable equalizer circuit based on the data obtained by the control unit; and a first monitoring control unit that transmits and receives a control signal to and from the high-frequency unit. The synthesized signal input via the cable is represented by I
A second synthesizing unit that separates an F signal and a DC voltage and transmits given data as a response signal to the control unit;
A control signal is transmitted and received between the duplexer, a high-frequency circuit that outputs the separated IF signal as an SHF signal, a high-frequency power supply that supplies the separated DC voltage to the high-frequency circuit, and the control device. A second monitoring and control device, a level detection circuit for detecting a level of the control signal received by the second monitoring and control device, and a second arithmetic unit for providing the level as data to the second combining and splitting device. A digital FPU transmission device, comprising: a high-frequency unit having: a coaxial cable connecting the control unit and the high-frequency unit. 4. A high-frequency circuit that amplifies an input SHF signal as an IF signal, superimposes data given to the IF signal as a response signal, transmits the signal to a control unit via a coaxial cable, and receives an input DC signal. A second synthesizer / demultiplexer that separates a voltage, a high-frequency power supply that supplies the separated DC voltage to the high-frequency circuit, and a second monitoring and control device that transmits and receives a control signal between the control unit and A level detection circuit for detecting the level of the control signal received by the second monitoring and control device;
A high-frequency unit having a second arithmetic unit provided to the duplexer; a power supply unit for outputting a predetermined DC voltage; and separating the data from an IF signal transmitted from the high-frequency unit via the coaxial cable, A first synthesizer / demultiplexer that outputs a DC voltage to the coaxial cable, a variable equalizer circuit that has a frequency characteristic that changes according to a given signal and passes the IF signal, A level correction circuit for correcting the level of the signal, an IF demodulator for demodulating the input IF signal into an image / audio signal, and transmitting the signal to the level correction circuit and the variable equalizer circuit based on the separated data. Give first
A digital FPU receiving device, comprising: a control unit having an arithmetic unit; and the coaxial cable connecting the high-frequency unit and the control unit. 5. An IF modulator for converting an input signal into an IF signal, a level correction circuit for correcting the level of the IF signal by a given signal, and a frequency characteristic changing according to the given signal. A variable equalizer circuit for passing the IF signal, a power supply unit for outputting a predetermined DC voltage,
A first combiner / demultiplexer that combines the IF signal and the DC voltage via the variable equalizer circuit, outputs the combined signal to a coaxial cable, and separates data transmitted from a high frequency unit; A control unit comprising: a first arithmetic unit that supplies the signal to the level correction circuit and the variable equalizer circuit based on the data obtained by the control unit; and a first monitoring control unit that transmits and receives a control signal to and from the high-frequency unit. The synthesized signal input via the cable is represented by I
An F signal, a DC voltage and an audio signal, a second combiner / splitter for transmitting given data as a response signal to the control unit, and an SHF for separating the separated IF signal.
A high-frequency circuit that outputs a signal,
A high-frequency unit power supply for supplying a voltage to the high-frequency circuit, a level detection circuit for detecting a level of the separated audio signal, and a second arithmetic unit for providing the level as data to the second synthesis / demultiplexer. A digital FPU transmission device, comprising: a high-frequency unit having the coaxial cable that connects the control unit and the high-frequency unit. 6. A high-frequency circuit for amplifying an input SHF signal as an IF signal, superimposing given data on the IF signal as a response signal,
A second synthesizer / separator that separates a C voltage and further separates an audio signal included in the IF signal; a high-frequency unit power supply that supplies the separated DC voltage to the high-frequency circuit; A level detection circuit for detecting the level of
A high-frequency unit having a second arithmetic unit for providing the level as data to the second combining and splitting unit; a power supply unit for outputting a predetermined DC voltage; and an IF transmitted from the high-frequency unit via the coaxial cable. A first combiner / demultiplexer for separating the data from a signal and outputting the DC voltage to the coaxial cable, and a variable equalizer having a frequency characteristic that changes according to a given signal and passing the IF signal Circuit, a level correction circuit for correcting the level of the IF signal according to a given signal, an IF demodulator for demodulating the input IF signal into an image / audio signal, and the level correction based on the separated data. A first circuit for providing the signal to the circuit and the variable equalizer circuit;
A digital FPU receiving device, comprising: a control unit having an arithmetic unit; and the coaxial cable connecting the high-frequency unit and the control unit. 7. A control unit comprising: an AGC circuit for controlling the level of an IF signal to a predetermined value; and a changeover switch for selecting use or non-use of the AGC circuit based on a command from an arithmetic unit. The FPU transmitting apparatus according to any one of claims 1 to 3, wherein 8. A control unit comprising: an AGC circuit for controlling the level of an IF signal to a predetermined value; and a changeover switch for selecting use or non-use of the AGC circuit based on a command from an arithmetic unit. The FPU receiving apparatus according to claim 2, wherein