JP7059616B2 - Signal output device, signal transmission system, broadcast service provision method, signal output method, and signal output program - Google Patents

Description

The present invention relates to a signal output device, a signal transmission system, a broadcasting service providing method, a signal output method, and a signal output program.

There is an FPU (Field Pickup Unit (also referred to as Microwave Link)) transmitter that transmits broadcasting materials such as video and audio from outside the broadcasting station to the broadcasting station. There is also an FPU receiver that receives broadcast material transmitted from outside the broadcasting station.

Patent Document 1 shows an example of a video transmission device of a MIMO (Multi-Input and Multi-Output) -OFDM (Orthogonal Frequency Division Multiplexing) digital FPU system. In the example described in Patent Document 1, the video transmission device is a transmission control unit which is a unit for processing a baseband signal and a transmission high frequency unit which is a unit for processing an RF (Radio Frequency) band signal. It is composed of and. The transmission control unit and the transmission high frequency unit are connected to each other by a single IF (Intermediate Frequency) cable.

Then, in the video transmission device described in Patent Document 1, the transmission control unit converts one of the two generated signals having the same frequency and synchronized with each other to 190 MHz, which is 30 MHz higher, and the other is 30 MHz lower. The frequency is converted to 130 MHz. Then, the transmission control unit transmits the 190 MHz signal and the 130 MHz signal to the transmission high frequency unit via one IF cable.

JP-A-2017-050614

In MIMO, radio waves are radiated from antennas of a plurality of systems (for example, two), but there is a problem that the radio waves interfere with each other if they are not synchronized with each other.

Therefore, there is a method in which the transmission control unit and the transmission high frequency unit are connected to each other with a plurality of IF cables, and the mutually synchronized signals generated by the transmission control unit are transmitted to the transmission high frequency unit via the corresponding IF cables. Conceivable. However, in such a method, the transmission control unit and the transmission high frequency unit are connected by a plurality of IF cables, and there is a problem that the degree of freedom in installing the video transmission device is reduced.

Further, in the method described in Patent Document 1, since a plurality of signals are subjected to frequency conversion processing, there is a problem that the circuit scale becomes large.

Therefore, the present invention is a signal capable of connecting a unit for processing a baseband signal and a unit for processing an RF band signal to each other via a smaller number of cables while suppressing an increase in circuit scale. It is an object of the present invention to provide an output device, a signal transmission system, a broadcasting service providing method, a signal output method, and a signal output program.

The signal output device according to the present invention is a signal generation means for generating a first signal according to the first data and generating a second signal having a frequency different from that of the first signal according to the second data. , An output means for outputting a third signal to the signal transmitter for adjusting the frequencies of the first signal, the second signal, and the second signal in the signal transmitter, and a pilot for generating the third signal. A signal generation means is provided, the first signal and the second signal are synchronized with each other, the output means multiplex the first signal, the second signal and the third signal with each other, and the pilot signal generation means , A first signal, and a third signal to be synchronized with the second signal.

The signal transmission system according to the present invention is characterized by including a signal output device of any aspect and a signal transmission device.

In the broadcasting service providing method according to the present invention, an electromagnetic wave corresponding to the first data and the second data is transmitted by using a signal transmission system of any aspect, and television is television based on the received electromagnetic wave. The receiver is characterized by transmitting an electromagnetic wave generated so that the first data and the data corresponding to the second data can be decoded.

The signal output method according to the present invention includes a signal generation step of generating a first signal according to the first data and generating a second signal having a frequency different from that of the first signal according to the second data. , An output step to output a third signal to the signal transmitter for adjusting the frequencies of the first signal, the second signal, and the second signal in the signal transmitter, and a pilot to generate the third signal. Including the signal generation step, the first signal and the second signal are synchronized with each other, the first signal, the second signal and the third signal are multiplexed with each other in the output step, and in the pilot signal generation step. , A first signal, and a third signal to be synchronized with the second signal.

The signal output program according to the present invention generates a first signal in a computer according to the first data, and generates a second signal having a frequency different from that of the first signal according to the second data. Signal generation processing, output processing to output a third signal for adjusting the frequencies of the first signal, the second signal, and the second signal in the signal transmitter to the signal transmitter, and the third signal. The pilot signal generation process is executed, the first signal and the second signal are synchronized with each other, and in the output process, the first signal, the second signal and the third signal are multiplexed with each other. The pilot signal generation process is characterized in that a third signal is generated so as to be synchronized with the first signal and the second signal.

According to the present invention, a unit for processing a baseband signal and a unit for processing an RF band signal can be connected to each other via a smaller number of cables while suppressing an increase in circuit scale.

It is a block diagram which shows the structural example of the transmission system of 1st Embodiment. It is a block diagram which shows the structural example of the transmission control part in 1st Embodiment. It is a block diagram which shows the structural example of the transmission high frequency part in 1st Embodiment. It is a flowchart which shows the operation of the transmission control part in 1st Embodiment. It is a flowchart which shows the operation of the transmission high frequency part in 1st Embodiment. It is a block diagram which shows the structural example of the transmission system of 2nd Embodiment. It is a block diagram which shows the structural example of the transmission control part in 2nd Embodiment. It is a block diagram which shows the structural example of the transmission system of 3rd Embodiment. It is a block diagram which shows the structural example of the transmission high frequency part in 3rd Embodiment. It is a block diagram which shows the structural example of the transmission system of 4th Embodiment. It is a block diagram which shows the structural example of the transmission high frequency part in 4th Embodiment. It is a block diagram which shows the structural example of the signal output device of 5th Embodiment.

Embodiment 1.
The transmission system of the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of a transmission system according to the first embodiment of the present invention.

As shown in FIG. 1, the transmission system of the first embodiment includes a transmission control unit 100 and a transmission high frequency unit 200. The transmission control unit 100 and the transmission high frequency unit 200 are connected to each other via a cable 300. The cable 300 is, for example, a coaxial cable, for example, one cable. The transmission system is, for example, an FPU transmitter.

For example, an antenna 310 and an antenna 320 corresponding to MIMO are connected to the transmission high frequency unit 200, respectively. Then, the signal input to the antenna 310 and the signal input to the antenna 320 by the transmission high frequency unit 200 are converted into radio waves and radiated respectively. The radiated radio wave is received by the antenna on the receiving side, converted into a signal, and input to a receiver (not shown). The receiver is, for example, an FPU receiver.

FIG. 2 is a block diagram showing a configuration example of the transmission control unit 100. As shown in FIG. 2, the transmission control unit 100 includes an individual data generation unit 110, a first IFFT (Inverse Fast Fourier Transform) processing unit 120a, a second IFFT processing unit 120b, a synthesis unit (synthesis means) 130, and a pilot. It includes a data generation unit 140, a first quadrature modulation unit (first signal generation means) 150a, a second quadrature modulation unit (second signal generation means) 150b, and a multiplexing unit 160.

If necessary, clock signals that are synchronized with each other are input to each unit of the transmission control unit 100. Then, each part executes the process at the timing based on the input clock signal. The clock signals input to each unit may have the same frequency or may be different from each other as long as they are synchronized with each other.

Further, the individual data generation unit 110, the first IFFT processing unit 120a, the second IFFT processing unit 120b, the pilot data generation unit 140, the first quadrature modulation unit 150a, and the second quadrature modulation unit 150b may be, for example. It is realized by a CPU (Central Processing Unit) that executes processing according to program control and a plurality of circuits. The synthesizing unit 130 and the multiplexing unit 160 are realized by, for example, a plurality of circuits.

Data to be transmitted to the receiving side is input to the individual data generation unit 110. The individual data generation unit 110 generates data to be input to the first IFFT processing unit 120a and data to be input to the second OFDM processing unit 120b based on the input data. Specifically, the individual data generation unit 110 generates, for example, parallel data composed of two systems of serial data based on the input system of serial data. The individual data generation unit 110 may be configured to generate a plurality of parallel data of two or more systems based on the input serial data of one system. Then, the individual data generation unit 110 inputs the data of one system to the first OFDM processing unit 120a and the data of the other system to the second OFDM processing unit 120b among the generated data. ..

The data input to the first Fourier processing unit 120a is the data corresponding to the signal input to the antenna 310 by the transmission high frequency unit 200 later. Further, the data input to the second Fourier processing unit 120b is the data corresponding to the signal input to the antenna 320 by the transmission high frequency unit 200 later.

Further, the data input to the first IFF processing unit 120a and the data input to the second IFF processing unit 120b are data in the frequency domain (data indicating the signal by the size of each frequency component).

The first IFFT processing unit 120a performs an inverse Fourier transform process on the input data, and converts the input data into time domain data (data indicating the signal by the temporal change of the amplitude). The process of the inverse Fourier transform is, for example, IFFT.

Then, the first IFFT processing unit 120a inputs the converted data to the first quadrature modulation unit 150a.

The first quadrature modulation unit 150a performs quadrature modulation processing on the input data to generate a signal in which the carrier wave of the first frequency is modulated. Specifically, the first quadrature modulation unit 150a generates, for example, a signal in which a carrier wave of 130 MHz is modulated based on the input data. Therefore, the first quadrature modulation unit 150a has, for example, a function of converting the frequency of the input data which is a baseband signal to 130 MHz and a function of converting the frequency into an analog signal corresponding to the data.

Then, the first quadrature modulation unit 150a inputs the modulated signal (also referred to as the first signal) to the multiplexing unit 160.

The second IFFT processing unit 120b performs an inverse Fourier transform process on the input data and converts it into time domain data. The process of the inverse Fourier transform is, for example, IFFT.

Then, the second IFFT processing unit 120b inputs the converted data to the synthesis unit 130.

A pilot data generation unit 140 is connected to the synthesis unit 130. The pilot data generation unit 140 generates data according to a predetermined frequency. Then, the pilot data generation unit 140 inputs the generated data to the synthesis unit 130.

The pilot data generation unit 140 generates digital data indicating a predetermined frequency such as 26 MHz. Further, as described above, the pilot data generation unit 140 is input with clock signals synchronized with the first quadrature modulation unit 150a and the second quadrature modulation unit 150b. Then, the pilot data generation unit 140 generates third data based on the signal so that the third signal described later synchronizes with the first signal and the second signal described later. ..

The synthesizing unit 130 multiplexes the data input by the second Fourier processing unit 120b and the data generated by the pilot data generation unit 140 with each other. Then, the synthesis unit 130 inputs the data after multiplexing, in which the data input by the second IFFT processing unit 120b and the data generated by the pilot data generation unit 140 are multiplexed with each other, to the second quadrature modulation unit 150b. do. In the synthesis unit 130, for example, an addition process is performed.

The second orthogonal modulation unit 150b generates, for example, a signal in which the carrier wave of the second frequency is modulated and a signal in which the carrier wave of the third frequency is modulated based on the data input by the synthesis unit 130. .. Specifically, the second quadrature modulation unit 150b is based on, for example, the data input to the synthesizer 130 by the second IFF processing unit 120b, which is a baseband signal multiplexed in the data input by the synthesizer 130. Therefore, a signal (also referred to as a second signal) in which a carrier wave of 52 MHz is modulated is generated. Further, the second quadrature modulation unit 150b is, for example, a signal (also referred to as a third signal) having a frequency of 78 MHz based on the data generated by the pilot data generation unit 140, which is multiplexed in the data input by the synthesis unit 130. Generate. Then, the second quadrature modulation unit 150b inputs each generated signal to the multiplexing unit 160.

Therefore, the second quadrature modulation unit 150b up-converts the baseband signal input by the second OFDM processing unit 120b into a 52 MHz signal, and the 26 MHz signal generated by the pilot data generation unit 140 is 52 MHz. It will be up-converted and converted into a 78 MHz signal.

Therefore, the second quadrature modulation unit 150b has, for example, a function of up-converting the frequency of the baseband signal to 52 MHz and a function of converting the data into an analog signal.

The multiplexing unit 160 includes a first signal having a frequency of 130 MHz input by the first quadrature modulation unit 150a, a second signal having a frequency of 52 MHz input by the second quadrature modulation unit 150b, and a third signal having a frequency of 78 MHz. Multiplex with each other's signals.

Then, the multiplexing unit 160 transmits a signal in which the first signal, the second signal, and the third signal are multiplexed with each other to the transmission high frequency unit 200 via the cable 300.

The frequency of the first signal, the frequency of the second signal, and the frequency of the third signal described above are all examples, and the value of the frequency of the second signal and the value of the frequency of the third signal are used. As long as the relationship is established in which the sum of is equal to the value of the frequency of the first signal, those frequencies may be set arbitrarily.

FIG. 3 is a block diagram showing a configuration example of the transmission high frequency unit 200. As shown in FIG. 3, the transmission high frequency unit 200 includes a first filter 210a, a delay processing unit 220, a supply signal generation unit 230, a first upconverter 240, a first amplification unit 250, and a second filter 210b. It includes a multiplication unit 260, a fourth filter 210d, a second upconverter 270, a second amplification unit 280, and a third filter 210c.

The first filter 210a, the delay processing unit 220, the second filter 210b, the multiplication unit 260, the fourth filter 210d, and the third filter 210c are realized by, for example, a plurality of circuits. The supply signal generation unit 230, the first upconverter 240, the first amplification unit 250, the multiplication unit 260, the second upconverter 270, and the second amplification unit 280 are realized by, for example, a plurality of circuits.

A signal transmitted by the transmission control unit 100 (more specifically, the multiplexing unit 160) is input to the first filter 210a, the second filter 210b, and the third filter 210c via the cable 300.

The first filter 210a is configured so that only the first signal passes through. Specifically, the first filter 210a is, for example, a bandpass filter configured to pass a signal in the frequency band of the first signal.

The second filter 210b is configured so that only the second signal passes through. Specifically, the second filter 210b is, for example, a bandpass filter configured to pass a signal in the frequency band of the second signal.

The third filter 210c is configured so that only the third signal passes through. Specifically, the third filter 210c is, for example, a bandpass filter configured to pass a signal in the frequency band of the third signal.

The first filter 210a, the second filter 210b, the third filter 210c, and other filters described later may be active filters or passive filters, respectively.

A signal that has passed through the second filter 210b, that is, a second signal, and a signal that has passed through the third filter 210c, that is, a third signal are input to the multiplication unit 260. Then, the multiplication unit 260 generates a fourth signal and a fifth signal as a result of multiplying the second signal and the third signal with each other.

The value of the frequency f4 of the fourth signal is the sum value of the frequency f2 of the second signal and the frequency f3 of the third signal. In this example, the frequency f2 of the second signal is 52 MHz and the frequency f3 of the third signal is 78 MHz, so that the frequency f4 of the fourth signal is 52 + 78 = 130 MHz. Therefore, the frequency f4 of the fourth signal should be the same as the frequency f1 of the first signal.

Further, the value of the frequency f5 of the fifth signal is an absolute value of the difference between the frequency f2 of the second signal and the frequency f3 of the third signal. In this example, the frequency f2 of the second signal is 52 MHz and the frequency f3 of the third signal is 78 MHz, so that the frequency f5 of the fifth signal is | 52-78 | = 26 MHz.

The fourth filter 210d is configured so that only the fourth signal passes through. Specifically, the fourth filter 210d is, for example, a bandpass filter configured to pass a signal in the frequency band of the fourth signal. Then, when the fourth signal and the fifth signal are input to the fourth filter 210d, only the fourth signal passes through.

The fourth signal that has passed through the fourth filter 210d is input to the second upconverter 270.

The supply signal generation unit 230 generates a supply signal which is a signal having a predetermined frequency. Then, the supply signal generation unit 230 inputs the generated supply signal to the first upconverter 240 and the second upconverter 270. The predetermined frequency values, which are the frequencies of the supply signals, are, for example, the values of the frequency f1 of the first signal and the frequency f4 of the fourth signal, and the predetermined RF band signals input to the antennas 310 and 320. It is the value of the difference from the value of the frequency of.

The second upconverter 270 uses the input supply signal to convert the frequency of the fourth signal to a higher frequency in the RF (Radio Frequency) band. Then, the second upconverter 270 inputs the converted fourth signal to the second amplification unit 280.

The second amplification unit 280 amplifies the input fourth signal at a predetermined amplification factor and inputs it to the antenna 320.

The fourth signal input to the antenna 320 is converted into an electromagnetic wave and radiated.

The first signal that has passed through the first filter 210a is input to the delay processing unit 220. Then, the delay processing unit 220 delays the input first signal for a time corresponding to the time required for processing the second signal and the third signal in the multiplication unit 260, and causes the first upconverter 240. input. The delay processing unit 220 may be configured to adjust the phase of the first signal according to the phase shift that occurs when the fourth signal passes through the fourth filter 210d.

The first upconverter 240 uses the input supply signal to convert the frequency of the first signal to a frequency in the higher RF band. Then, the first upconverter 240 inputs the converted first signal to the first amplification unit 250.

The first amplification unit 250 amplifies the input first signal at a predetermined amplification factor and inputs it to the antenna 310.

The first signal input to the antenna 310 is converted into an electromagnetic wave and radiated.

The first upconverter 240 and the second upconverter 270 include, for example, a multiplier and a filter, respectively. Then, for example, a supply signal is input to the multiplier, the supply signal is multiplied by the first signal in the first upconverter 240, and the signal of the multiplication result is input to the filter. Among the multiplication result signals input to the filter, a signal having a higher frequency passes through the filter and is input to the first amplification unit 250.

Further, in the second upconverter 270, the supply signal and the fourth signal are multiplied, and the signal of the multiplication result is input to the filter. Among the multiplication result signals input to the filter, a signal having a higher frequency passes through the filter and is input to the second amplification unit 280.

Next, the operation of the transmission system according to the first embodiment of the present invention will be described. FIG. 4 is a flowchart showing the operation of the transmission control unit 100 in the transmission system according to the first embodiment of the present invention.

As shown in FIG. 4, the transmission control unit 100 (specifically, for example, the individual data generation unit 110) inputs data to the first IFFT processing unit 120a when data is input (one system). Data) and data to be input to the second IFFT processing unit 120b (data of the other system) are generated (step S101).

The first IFFT processing unit 120a performs an inverse Fourier transform process on the input data and converts it into time domain data (data indicating the signal by the temporal change of the amplitude) (step S102a).

The first quadrature modulation unit 150a performs quadrature modulation processing on the data converted by the first Fourier processing unit 120a to generate a first signal (step S105a).

The second IFFT processing unit 120b performs an inverse Fourier transform process on the input data and converts it into time domain data (data indicating the signal by the temporal change of the amplitude) (step S102b).

The pilot data generation unit 140 generates data according to a predetermined frequency (step S103).

The synthesizing unit 130 multiplexes the data converted by the second Fourier processing unit 120b and the data generated by the pilot data generation unit 140 with each other (step S104).

The second quadrature modulation unit 150b generates a second signal and a third signal based on the data input by the synthesis unit 130 (step S105b).

The multiplexing unit 160 multiplexes the first signal generated by the first quadrature modulation unit 150a and the second signal and the third signal generated by the second quadrature modulation unit 150b (step S106).

Then, the multiplexing unit 160 transmits a signal in which the first signal, the second signal, and the third signal are multiplexed with each other to the transmission high frequency unit 200 via the cable 300 (step S107).

The operation of the transmission high frequency unit 200 will be described. FIG. 5 is a flowchart showing the operation of the transmission high frequency unit 200 in the transmission system of the first embodiment of the present invention.

The signal transmitted by the multiplexing unit 160 of the transmission control unit 100 in the process of step S107 is input to the first filter 210a, the second filter 210b, and the third filter 210c via the cable 300.

The first filter 210a passes the first signal (step S201a). The second filter 210b passes the second signal (step S201b). The third filter 210c passes the third signal (step S201c).

The multiplication unit 260 generates a fourth signal and a fifth signal as a result of multiplying the second signal and the third signal with each other (step S202b).

The fourth filter 210d passes only the fourth signal having a higher frequency among the fourth signal and the fifth signal (step S203b).

The second amplification unit 280 amplifies the fourth signal at a predetermined amplification factor (step S204b), and inputs the fourth signal to the antenna 320. The fourth signal input to the antenna 320 is converted into an electromagnetic wave and radiated.

The delay processing unit 220 delays the input first signal for a time corresponding to the time required for the processing in step S202b (step S202a), and inputs the input to the first amplification unit 250. The delay processing unit 220 is configured to delay the input first signal by a time corresponding to the time required for the processing of step S203b in addition to the time corresponding to the time required for the processing of step S202b. May be good.

The first amplification unit 250 amplifies the input first signal at a predetermined amplification factor (step S204a), and inputs the input to the antenna 310. The first signal input to the antenna 310 is converted into an electromagnetic wave and radiated. The radiated electromagnetic wave is received by a predetermined transmission / reception device and is subjected to processing such as amplification. Then, the electromagnetic wave processed by the predetermined transmission / reception device is transmitted so that the data corresponding to the data input to the transmission control unit 100 can be decoded by the television receiver.

According to the present embodiment, the transmission control unit 100 input with one system of serial data synchronizes with each other based on the serial data via one cable 300, and signals of a plurality of systems having different frequencies from each other. Transmission Transmits to the high frequency unit 200. Then, the transmission high frequency unit 200 inputs signals of a plurality of systems synchronized with each other to the antennas 310 and 320 so as to have the same frequency. Then, those signals are radiated through the antennas 310 and 320, respectively.

Therefore, the transmission control unit 100 transmits signals of a plurality of systems based on one system of serial data to the transmission high frequency unit 200 via one cable 300, and the transmission high frequency units 200 mutually based on the serial data. Signals that are synchronized and have the same frequency as each other can be radiated through the antennas 310 and 320, respectively.

Since the radio waves radiated by the antenna 310 and the radio waves radiated by the antenna 320 are synchronized with each other, mutual interference between them can be prevented.

Embodiment 2.
Next, the transmission system of the second embodiment of the present invention will be described. FIG. 6 is a block diagram showing a configuration example of a transmission system according to a second embodiment of the present invention.

As shown in FIG. 6, the transmission system of the second embodiment of the present invention is different from the transmission system of the first embodiment of the present invention shown in FIG. 1 in that it includes a transmission control unit 102. Since the other components are the same as those in the first embodiment shown in FIG. 1, the corresponding elements are designated by the same reference numerals as those in FIG. 1 and the description thereof will be omitted.

FIG. 7 is a block diagram showing a configuration example of the transmission control unit 102 in the transmission system of the second embodiment. As shown in FIG. 7, the transmission control unit 102 in the transmission system of the second embodiment includes the pilot data generation unit (pilot signal generation means) 142, and the transmission control unit 100 in the first embodiment is configured. Is different. Since the other components are the same as the configuration of the transmission control unit 100 in the transmission system of the first embodiment shown in FIG. 2, the corresponding elements are designated by the same reference numerals as those in FIG. 2 and the description thereof will be omitted.

The pilot data generation unit 142 is realized by, for example, a CPU that executes processing according to program control or a plurality of circuits.

The pilot data generation unit 142 generates a signal having a predetermined frequency. The signal generated by the pilot data generation unit 142 corresponds to the third signal in the first embodiment. Then, the pilot data generation unit 142 inputs the generated signal to the multiplexing unit 160.

Therefore, in the first embodiment, the second quadrature modulation unit 150b generates the third signal, whereas in the present embodiment, the pilot data generation unit 142 generates the third signal.

Then, the multiplexing unit 160 multiplexes the third signal input by the pilot data generation unit 142 with the first signal and the second signal, and transmits the third signal to the transmission high frequency unit 200 via the cable 300.

According to this embodiment, the pilot data generation unit 142 generates a third signal. Then, the first signal, the second signal, and the third signal are multiplexed with each other and transmitted to the transmission high frequency unit 200 via the cable 300 by the multiplexing unit 160.

Therefore, according to the present embodiment, the same effect as that of the first embodiment can be obtained.

Embodiment 3.
Next, the transmission system according to the third embodiment of the present invention will be described. FIG. 8 is a block diagram showing a configuration example of a transmission system according to a third embodiment of the present invention.

As shown in FIG. 8, the transmission system of the third embodiment of the present invention is different from the transmission system of the first embodiment of the present invention shown in FIG. 1 in that it includes a transmission high frequency unit 203. Since the other components are the same as those in the first embodiment shown in FIG. 1, the corresponding elements are designated by the same reference numerals as those in FIG. 1 and the description thereof will be omitted.

FIG. 9 is a block diagram showing a configuration example of the transmission high frequency unit 203 in the transmission system of the third embodiment. As shown in FIG. 9, the transmission high frequency unit 203 in the transmission system of the third embodiment is different from the configuration of the transmission high frequency unit 200 in the first embodiment in that the transmission high frequency unit 203 includes the corresponding signal generation unit 263. Since the other components are the same as the configuration of the transmission high frequency unit 200 in the transmission system of the first embodiment shown in FIG. 3, the corresponding elements are designated by the same reference numerals as those in FIG. 3 and the description thereof will be omitted.

The corresponding signal generation unit 263 is realized by, for example, a plurality of circuits.

In each of the above-described embodiments, the relationship that the sum of the frequency value of the second signal and the frequency value of the third signal is equal to the frequency value of the first signal is established. However, in the present embodiment, such a relationship may not be established as long as they are synchronized with each other. Specifically, in the present embodiment, the frequency of the first signal is 130 MHz, the frequency of the second signal is 52 MHz, the frequency of the third signal is 1 MHz, and these signals are synchronized with each other. Suppose you are.

A third signal that has passed through the third filter 210c is input to the corresponding signal generation unit 263. Then, the corresponding signal generation unit 263 generates a sixth signal synchronized with the input third signal. Here, since the third signal is synchronized with the first signal and the second signal, the sixth signal is also synchronized with the first signal and the second signal. It is assumed that the frequency of the sixth signal is the absolute value of the difference between the frequency of the first signal and the frequency of the second signal. Specifically, in the present embodiment, the frequency of the first signal is 130 MHz and the frequency of the second signal is 52 MHz, so that the frequency of the sixth signal is | 130-52 | = 78 MHz. ..

The corresponding signal generation unit 263 inputs the generated sixth signal to the multiplication unit 260.

The multiplication unit 260 generates a fourth signal and a fifth signal as a result of multiplying the input sixth signal and the second signal that has passed through the second filter 210b with each other.

According to the present embodiment, the corresponding signal generation unit 263 generates a sixth signal synchronized with the first signal and the second signal generated by the transmission high frequency unit 200. Then, the multiplication unit 260 generates at least a fourth signal based on the sixth signal.

Therefore, according to the present embodiment, the same effect as that of the first embodiment can be obtained.

Embodiment 4.
Next, the transmission system of the fourth embodiment of the present invention will be described. FIG. 10 is a block diagram showing a configuration example of a transmission system according to a fourth embodiment of the present invention.

As shown in FIG. 10, the transmission system of the fourth embodiment of the present invention is different from the transmission system of the first embodiment of the present invention shown in FIG. 1 in that it includes a transmission high frequency unit 204. Since the other components are the same as those in the first embodiment shown in FIG. 1, the corresponding elements are designated by the same reference numerals as those in FIG. 1 and the description thereof will be omitted.

FIG. 11 is a block diagram showing a configuration example of the transmission high frequency unit 204 in the transmission system of the fourth embodiment. As shown in FIG. 11, the transmission high frequency section 204 in the transmission system of the fourth embodiment includes a first filter 210a, a second filter 210b, a third filter 210c, a first predetermined signal generation section 234a, and a first filter. 2. Predetermined signal generation unit 234b, first upconverter 244, second upconverter 274, first amplification unit 250, and second amplification unit 280 are included.

The first predetermined signal generation unit 234a, the second predetermined signal generation unit 234b, the first upconverter 244, the second upconverter 274, the first amplification unit 250, and the second amplification unit 280 may be described, for example. It is realized by multiple circuits.

Similar to the first embodiment, the signal transmitted by the transmission control unit 100 is input to the first filter 210a, the second filter 210b, and the third filter 210c.

Similar to the first embodiment, the first filter 210a is configured so that only the first signal passes through. The second filter 210b is configured so that only the second signal passes through. The third filter 210c is configured so that only the third signal passes through.

The first signal that has passed through the first filter 210a is input to the first upconverter 244. The second signal that has passed through the second filter 210b is input to the second upconverter 274. The third signal that has passed through the third filter 210c is input to the first predetermined signal generation unit 234a and the second predetermined signal generation unit 234b.

The first predetermined signal generation unit 234a generates a seventh signal synchronized with the input third signal. Then, the first predetermined signal generation unit 234a inputs the generated seventh signal to the first upconverter 244. The frequency of the seventh signal is an absolute value of the difference between the predetermined frequency value of the signal in the RF band input to the antenna 310 and the frequency value of the first signal.

The first upconverter 244 uses the input seventh signal to convert the frequency of the first signal to a frequency in the higher RF band. Then, the first upconverter 244 inputs the converted first signal to the first amplification unit 250. The first amplification unit 250 amplifies the input first signal at a predetermined amplification factor and inputs it to the antenna 310.

The second predetermined signal generation unit 234b generates an eighth signal synchronized with the input third signal. Then, the second predetermined signal generation unit 234b inputs the generated eighth signal to the second upconverter 274. The eighth signal is configured such that the frequency is the absolute value of the difference between the predetermined frequency value of the RF band signal input to the antenna 320 and the frequency value of the second signal. Has been done.

The second upconverter 274 uses the input eighth signal to convert the frequency of the second signal to a frequency in the higher RF band. Then, the second upconverter 274 inputs the converted second signal to the second amplification unit 280. The second amplification unit 280 amplifies the input second signal at a predetermined amplification factor and inputs it to the antenna 320. It is assumed that the frequency of the second signal input to the antenna 320 is set to be the same as the frequency of the first signal input to the antenna 310.

The first upconverter 244 includes, for example, a multiplier and a filter. Then, for example, a seventh signal is input to the multiplier, the seventh signal and the first signal are multiplied by the first upconverter 244, and the signal of the multiplication result is input to the filter. .. Among the multiplication result signals input to the filter, a signal having a higher frequency passes through the filter and is input to the first amplification unit 250.

Further, the second upconverter 274 includes, for example, a multiplier and a filter. Then, for example, an eighth signal is input to the multiplier, the eighth signal and the fourth signal are multiplied in the second upconverter 274, and the signal of the multiplication result is input to the filter. .. Among the multiplication result signals input to the filter, a signal having a higher frequency passes through the filter and is input to the second amplification unit 280.

According to the present embodiment, the transmission high frequency unit 204 radiates signals that are synchronized with each other and have the same frequency as each other via the antennas 310 and 320, respectively, based on the signal transmitted from the transmission control unit 100. can do.

Therefore, according to the present embodiment, the same effect as that of the first embodiment can be obtained.

Embodiment 5.
Next, the signal output device according to the fifth embodiment of the present invention will be described with reference to the drawings. FIG. 12 is a block diagram showing a configuration example of the signal output device 10 according to the fifth embodiment of the present invention.

As shown in FIG. 12, the signal output device (for example, corresponding to the transmission control unit 102 in the second embodiment) 10 of the fifth embodiment of the present invention has a signal generation unit (signal generation means) 15 and an output. A unit (output means) 16 and a pilot signal generation unit (pilot signal generation means) 14 are included.

The signal generation unit 15 corresponds to, for example, the first quadrature modulation unit 150a and the second quadrature modulation unit 150b in the second embodiment. The output unit 16 corresponds to, for example, the multiplex unit 160 in the second embodiment. Further, the pilot signal generation unit 14 corresponds to, for example, the pilot data generation unit 142 in the second embodiment.

The signal generation unit 15 generates a first signal according to the first data, and generates a second signal having a frequency different from that of the first signal according to the second data.

The output unit 16 is a third signal for adjusting the frequencies of the first signal, the second signal, and the second signal in the signal transmission device (for example, corresponding to the transmission high frequency unit 200 in the second embodiment). Output the signal to the signal transmitter.

The pilot signal generation unit 14 generates a third signal.

The first signal and the second signal are synchronized with each other.

Then, the output unit 16 multiplexes the first signal, the second signal, and the third signal with each other.

Further, the pilot signal generation unit 14 generates a third signal so as to synchronize with the first signal and the second signal.

According to the present embodiment, the pilot signal generation unit 14 generates a third signal so as to synchronize with the first signal and the second signal. Further, the signal generation unit 15 generates a first signal according to the first data, and generates a second signal having a frequency different from that of the first signal according to the second data, and the third signal is generated. A third signal for adjusting the frequency of the second signal in the signal transmitter according to the data is generated. Then, the output unit 16 outputs the first signal, the second signal, and the third signal to the signal transmission device.

Therefore, the signal output device 10 and the signal transmission device can be connected to each other via a smaller number of cables while suppressing an increase in the circuit scale.

A broadcasting service is provided by utilizing each signal output device, a signal transmission system, a signal output method, and a signal output program according to each of the above-described embodiments. Examples of such broadcasting services include terrestrial digital broadcasting, BS (Broadcasting Satellite) digital broadcasting, CS (Communication Satellite) digital broadcasting, advanced narrow band satellite digital broadcasting, and advanced wideband digital broadcasting. , Not limited to these, but includes various other broadcasting services.

In addition, the broadcasting service is not limited to broadcasting services provided by broadcasting companies such as broadcasting stations that provide broadcasting services based on Japanese broadcasting standards, but also provides broadcasting services based on broadcasting standards other than Japan. It can also be provided by broadcasters. The broadcasting service also includes a next-generation broadcasting service that is transmitted via a plurality of different transmission lines, such as broadcasting and communication.

10 Signal output device 14, 140, 142 Pilot data generation unit 15 Signal generation unit 16 Output unit 100, 102 Transmission control unit 110 Individual data generation unit 120a First IFF processing unit 120b Second IFF processing unit 130 Synthesis unit 150a No. 1 Orthogonal modulation unit 150b 2nd orthogonal modulation unit 160 Multiplexing unit 200, 203 Transmission high frequency unit 210a 1st filter 210b 2nd filter 210c 3rd filter 210d 4th filter 220 Delay processing unit 230 Supply signal generation unit 234a First predetermined signal generation unit 234b Second predetermined signal generation unit 240, 244 First upconverter 250 First amplification unit 260 Multiplying unit 263 Corresponding signal generation unit 270, 274 Second upconverter 280 Second upconverter Amplifier 300 cable 310,320 antenna

Claims (7)

A signal generation means that generates a first signal according to the first data and a second signal having a frequency different from that of the first signal according to the second data.
An output means for outputting the first signal, the second signal, and a third signal for adjusting the frequency of the second signal in the signal transmission device to the signal transmission device.
A pilot signal generation means for generating the third signal is provided.
The first signal and the second signal are synchronized with each other,
The output means multiplexes the first signal, the second signal, and the third signal with each other.
The pilot signal generation means generates the third signal so as to synchronize with the first signal and the second signal .
The pilot signal generation means is
The third signal is generated so that the sum of the frequency value of the second signal and the frequency value of the third signal becomes the frequency value of the first signal.
A signal output device characterized by that . The signal generation means is
A first signal generation means for generating the first signal based on the first data,
The signal output device according to claim 1 , further comprising a second signal generation means for generating the second signal based on the second data. The signal output device according to claim 1 or 2 , wherein the output means transmits the first signal, the second signal, and the third signal to the signal transmission device via one path. .. The signal output device according to any one of claims 1 to 3 ,
A signal transmission system comprising the signal transmission device. Using the signal transmission system according to claim 4 , electromagnetic waves corresponding to the first data and the second data are transmitted.
A method for providing a broadcasting service, characterized in that a television receiver transmits an electromagnetic wave generated so that data corresponding to the first data and the second data can be decoded based on the received electromagnetic wave. .. A signal generation step of generating a first signal according to the first data and generating a second signal having a frequency different from that of the first signal according to the second data.
An output step of outputting to the signal transmitter a third signal for adjusting the frequencies of the first signal, the second signal, and the second signal in the signal transmitter.
Including the pilot signal generation step of generating the third signal.
The first signal and the second signal are synchronized with each other,
In the output step, the first signal, the second signal, and the third signal are multiplexed with each other.
In the pilot signal generation step, the third signal is generated so as to be synchronized with the first signal and the second signal .
In the pilot signal generation step,
The third signal is generated so that the sum of the frequency value of the second signal and the frequency value of the third signal becomes the frequency value of the first signal.
A signal output method characterized by that. On the computer
A signal generation process that generates a first signal according to the first data and generates a second signal having a frequency different from that of the first signal according to the second data.
Output processing for outputting the first signal, the second signal, and the third signal for adjusting the frequency of the second signal in the signal transmission device to the signal transmission device.
The pilot signal generation process for generating the third signal is executed, and the operation is performed.
The first signal and the second signal are synchronized with each other.
In the output process, the first signal, the second signal, and the third signal are multiplexed with each other.
In the pilot signal generation process, the third signal is generated so as to be synchronized with the first signal and the second signal .
In the pilot signal generation process,
The third signal is generated so that the sum of the frequency value of the second signal and the frequency value of the third signal becomes the frequency value of the first signal.
Program for signal output.

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