JP2019110498A - Signal output device, signal transmission system, broadcast service providing method, signal output method, and program for signal output - Google Patents

Abstract

To provide a signal output device that can connect a unit for processing a baseband signal via a smaller number of cables and a unit for processing a signal in the RF band with each other, while preventing an increase in circuit scale.SOLUTION: A signal generation unit 15 generates a first signal according to first data, generates a second signal different in frequency from the first signal according to second data, and generates a third signal for adjusting the frequency of the second signal in a signal transmission device according to third data. An output unit 16 outputs the first signal, second signal, and third signal to the signal transmission device. A pilot data generation unit 14 generates the third data. The first data and the second data are synchronized with each other. The output unit 16 multiplexes the first signal, second signal, and third signal with each other. The pilot data generation unit 14 generates the third data such that the third signal and the first signal and second signal are synchronized with each other.SELECTED DRAWING: Figure 12

Description

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

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

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

  Then, in the video transmission apparatus described in Patent Document 1, the transmission control unit frequency-converts one of the generated two signals synchronized to have the same frequency into 190 MHz, which is 30 MHz higher, and lowers the other by 30 MHz. 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, 2017-050614, A

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

  Therefore, there is a method in which the transmission control unit and the transmission high frequency unit are mutually connected by 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 of installation of the video transmission device is reduced.

  Further, in the method described in Patent Document 1, the frequency conversion process is performed on a plurality of signals, so there is a problem that the circuit scale becomes large.

  Therefore, the present invention is a signal that can connect a unit for processing a baseband signal through a smaller cable and a unit for processing an RF band signal while suppressing an increase in circuit scale. An output device, a signal transmission system, a broadcast service providing method, a signal output method, and a program for signal output are provided.

  A signal output device according to the present invention generates a first signal in response to the first data, and generates a second signal having a frequency different from that of the first signal in response to the second data. Signal generation means for generating a third signal for adjusting the frequency of the second signal in the signal transmission device according to the data, and the first signal, the second signal, and the third signal transmission device , And pilot data generation means for generating third data, wherein the first signal and the second signal are synchronized with each other, and the output means comprises a first signal and a second signal. And the third signal are multiplexed with each other, and the pilot data generation means generates the third data so that the third signal synchronizes with the first signal and the second signal. .

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

  A broadcast service providing method according to the present invention transmits an electromagnetic wave according to the first data and the second data using the signal transmission system of any aspect, and a television based on the received electromagnetic wave. A receiver is characterized by transmitting an electromagnetic wave generated so as to be able to decode data according to the first data and the second data.

  A signal output method according to the present invention generates a first signal according to first data, and generates a second signal having a frequency different from that of the first signal according to the second data. A signal generation step of generating a third signal for adjusting the frequency of the second signal in the signal transmission device according to the data, and transmitting the first signal, the second signal, and the third signal And a pilot data generation step of generating third data, wherein the first signal and the second signal are synchronized with each other, and the output step includes a first signal and a second signal. And generating a third data so that the third signal synchronizes with the first signal and the second signal in the pilot data generation step. .

  The program for signal output according to the present invention causes the computer to generate a first signal according to the first data, and generate a second signal having a frequency different from that of the first signal according to the second data. A signal generation process for generating a third signal for adjusting the frequency of the second signal in the signal transmission apparatus according to the third data, a first signal, a second signal, and a third signal Is output to the signal transmission apparatus, and pilot data generation processing for generating third data is executed, the first signal and the second signal are synchronized with each other, and the first signal is output processing. , The second signal and the third signal are multiplexed together, and the pilot data generation process generates the third data so that the third signal synchronizes with the first signal and the second signal. It is characterized by

  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 through fewer cables while suppressing an increase in circuit scale.

It is a block diagram showing an example of composition of a transmitting system of a 1st embodiment. It is a block diagram showing an example of composition of a transmission control part in a 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 operation | movement of the transmission control part in 1st Embodiment. It is a flowchart which shows operation | movement 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 showing an example of composition of a signal output device of a 5th embodiment.

Embodiment 1
A transmission system of a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an example of the configuration of a transmission system according to the first embodiment of this 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 the 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 compatible with MIMO are connected to the transmission high frequency unit 200, respectively. Then, the signal input to the antenna 310 by the transmission high frequency unit 200 and the signal input to the antenna 320 are converted into radio waves and respectively emitted. 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. 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 combining unit (combining means) 130, and a pilot. It includes a data generation unit 140, a first orthogonal modulation unit (first signal generation means) 150a, a second orthogonal modulation unit (second signal generation means) 150b, and a multiplexing unit 160.

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

  Also, 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 orthogonal modulation unit 150a, and the second orthogonal modulation unit 150b may be It is realized by a central processing unit (CPU) that executes processing in accordance with program control and a plurality of circuits. The synthesis unit 130 and the multiplexing unit 160 are realized by, for example, a plurality of circuits.

  Data to be transmitted to the reception 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 120 a and data to be input to the second IFFT processing unit 120 b 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 one 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 one series of serial data. Then, the individual data generation unit 110 inputs data of one system among the generated data to the first IFFT processing unit 120a, and inputs data of the other system to the second IFFT processing unit 120b. .

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

  The data input to the first IFFT processing unit 120a and the data input to the second IFFT processing unit 120b are data in the frequency domain (data indicating the signal by the magnitude of each of the frequency components).

  The first IFFT processing unit 120a performs inverse Fourier transform processing on the input data to convert it into data in the time domain (data represented by a temporal change in 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 orthogonal modulation unit 150a.

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

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

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

  Then, the second IFFT processing unit 120 b inputs the data after conversion to the combining unit 130.

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

  The pilot data generation unit 140 generates digital data indicating a predetermined frequency such as 26 MHz, for example. Further, as described above, the pilot data generation unit 140 receives the clock signal synchronized with the first orthogonal modulation unit 150a and the second orthogonal modulation unit 150b. Then, based on the signal, the pilot data generation unit 140 generates third data such that a third signal to be described later synchronizes with a first signal to be described later and the second signal. .

  The combining unit 130 multiplexes the data input by the second IFFT processing unit 120 b and the data generated by the pilot data generation unit 140 with each other. Then, combining section 130 inputs multiplexed data obtained by multiplexing the data input by second IFFT processing section 120 b and the data generated by pilot data generation section 140 to second orthogonal modulation section 150 b. Do. The combining unit 130 performs, for example, addition processing.

  The second orthogonal modulation unit 150 b 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, for example, the second orthogonal modulation unit 150b is based on the data input to the combining unit 130 by the second IFFT processing unit 120b, which is a baseband signal multiplexed in the data input to the combining unit 130. Thus, the 52 MHz carrier wave generates a modulated signal (also referred to as a second signal). In addition, the second orthogonal modulation unit 150 b may be, 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 multiplexed in the data input by the synthesis unit 130. Generate Then, the second orthogonal modulation unit 150 b inputs the generated signals to the multiplexing unit 160.

  Therefore, the second orthogonal modulation unit 150 b upconverts the baseband signal input by the second IFFT processing unit 120 b by 52 MHz and converts it into a 52 MHz signal, and the 26 MHz signal generated by the pilot data generation unit 140 is 52 MHz It will be upconverted and converted to a 78 MHz signal.

  Therefore, the second quadrature modulation unit 150 b 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 is configured such that the first signal with a frequency of 130 MHz input by the first orthogonal modulation unit 150a, the second signal with a frequency of 52 MHz input by the second orthogonal modulation unit 150b, and a third signal with a frequency of 78 MHz. And the signals of the

  Then, multiplexing section 160 transmits a signal in which the first signal, the second signal, and the third signal are mutually multiplexed to transmission radio frequency section 200 via 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 may be used. If the relationship in which the sum of is equal to the value of the frequency of the first signal is established, 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. 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. A multiplication unit 260, a fourth filter 210d, a second up-converter 270, a second amplification unit 280, and a third filter 210c are included.

  The first filter 210a, the delay processing unit 220, the second filter 210b, the multiplying 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 up-converter 240, the first amplification unit 250, the multiplication unit 260, the second up-converter 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 through the cable 300.

  The first filter 210a is configured to pass only the first signal. Specifically, the first filter 210a is, for example, a band pass filter configured to pass signals in the frequency band of the first signal.

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

  The third filter 210c is configured to pass only the third signal. Specifically, the third filter 210c is, for example, a band pass filter configured to pass signals 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.

  The multiplication unit 260 receives the signal that has passed through the second filter 210b, that is, the second signal, and the signal that has passed through the third filter 210c, that is, the third signal. 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 value of the sum 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 the frequency f4 of the fourth signal is 52 + 78 = 130 MHz. Therefore, the frequency f4 of the fourth signal should be the same frequency as the frequency f1 of the first signal.

  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 the frequency f5 of the fifth signal is | 52−78 | = 26 MHz.

  The fourth filter 210d is configured to pass only the fourth signal. Specifically, the fourth filter 210d is, for example, a band pass filter configured to pass signals 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 210 d is input to the second up-converter 270.

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

  The second up-converter 270 converts the frequency of the fourth signal to a frequency in a higher RF (Radio Frequency) band using the input supply signal. Then, the second up-converter 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 the amplified fourth signal to the antenna 320.

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

  The first signal 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 the processing of the second signal and the third signal in the multiplication unit 260, and transmits the delay to the first up converter 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 up-converter 240 converts the frequency of the first signal to a higher RF band frequency using the input supply signal. Then, the first up-converter 240 inputs the first signal after conversion to the first amplification unit 250.

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

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

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

  Further, the second up converter 270 multiplies the supply signal by the fourth signal, and the multiplication result signal is input to the filter. Among the signals of the multiplication result input to the filter, the higher frequency signal passes through the filter and is input to the second amplification unit 280.

  Next, the operation of the transmission system of the first exemplary 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 of the first embodiment of the present invention.

  As shown in FIG. 4, when data is input, the transmission control unit 100 (specifically, for example, the individual data generation unit 110) inputs data (one of the streams to be input to the first IFFT processing unit 120a. 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 inverse Fourier transform processing on the input data, and converts it into data in the time domain (data represented by a temporal change in amplitude) (step S102a).

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

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

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

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

  The second quadrature modulation unit 150 b generates a second signal and a third signal based on the data input by the combining unit 130 (step S 105 b).

  The multiplexing unit 160 multiplexes the first signal generated by the first orthogonal modulation unit 150 a and the second signal and the third signal generated by the second orthogonal modulation unit 150 b (step S 106).

  Then, the multiplexing unit 160 transmits a signal in which the first signal, the second signal, and the third signal are multiplexed to one another via the cable 300 to the transmission high frequency unit 200 (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 multiplexer 160 of the transmission controller 100 in the process of step S107 is input to the first filter 210a, the second filter 210b, and the third filter 210c through 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 S201 c).

  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 of higher frequency among the fourth signal and the fifth signal (step S203 b).

  The second amplification unit 280 amplifies the fourth signal at a predetermined amplification factor (step S 204 b) and inputs the amplified signal to the antenna 320. The fourth signal input to the antenna 320 is converted into an electromagnetic wave and emitted.

  The delay processing unit 220 delays the input first signal for a time corresponding to the time required for the process of step S 202 b (step S 202 a), and inputs the first signal to the first amplification unit 250. The delay processing unit 220 is configured to delay the input first signal according to the time required for the process of step S203b in addition to the time required for the process of step S202b. It is also good.

  The first amplification unit 250 amplifies the input first signal at a predetermined amplification factor (step S 204 a), and inputs the amplified first signal to the antenna 310. The first signal input to the antenna 310 is converted into an electromagnetic wave and emitted. The radiated electromagnetic waves are received by a predetermined transmission / reception device and subjected to processing such as amplification. Then, the electromagnetic wave subjected to the processing is transmitted by the predetermined transmission / reception device such that 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, to which serial data of one system is input, synchronizes signals based on the serial data via the single cable 300, and transmits signals of a plurality of systems having mutually different frequencies. Transmission to the transmission 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 respectively radiated via the antennas 310 and 320.

  Therefore, the transmission control unit 100 transmits signals of a plurality of systems based on serial data of one system to the transmission high frequency unit 200 via the single cable 300, and the transmission high frequency unit 200 generates the signals based on the serial data. The signals synchronized and brought to the same frequency as each other can be radiated via the antennas 310 and 320, respectively.

  And, since the radio wave radiated by the antenna 310 and the radio wave radiated by the antenna 320 are synchronized with each other, mutual interference in them can be prevented.

Embodiment 2
Next, a transmission system according to a 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 the second embodiment of this invention.

  As shown in FIG. 6, the transmission system of the second embodiment of the present invention differs from the transmission system of the first embodiment of the present invention shown in FIG. 1 in that the transmission control unit 102 is included. The other components are the same as those in the first embodiment shown in FIG. 1, and therefore the corresponding components are denoted by the same reference numerals as in FIG.

  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 differs from the configuration of the transmission control unit 100 in the first embodiment in that a pilot data generation unit 142 is included. 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, so the corresponding components are assigned the same reference numerals as in FIG.

  The pilot data generation unit 142 is realized by, for example, a CPU that executes processing in accordance with program control and a plurality of circuits.

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

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

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

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

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

Embodiment 3
Next, a transmission system of a third embodiment of the present invention will be described. FIG. 8 is a block diagram showing an exemplary configuration of a transmission system according to the third embodiment of this 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 the transmission high frequency unit 203 is included. The other components are the same as those in the first embodiment shown in FIG. 1, and therefore the corresponding components are denoted by the same reference numerals as in FIG.

  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 differs from the configuration of the transmission high frequency unit 200 in the first embodiment in that the corresponding signal generation unit 263 is included. 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, and therefore the corresponding elements are assigned the same reference numerals as in FIG.

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

  In each embodiment described above, the sum of the value of the frequency of the second signal and the value of the frequency of the third signal is configured to be equal to the value of the frequency of the first signal. In the present embodiment, such a relationship does not have to 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 the signals are synchronized with each other. It is assumed that

  The third signal 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. In the sixth signal, it is assumed that the frequency is an absolute value of the difference between the frequency of the first signal and the frequency of the second signal. Specifically, in the present embodiment, since the frequency of the first signal is 130 MHz and the frequency of the second signal is 52 MHz, 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 mutually multiplying the input sixth signal and the second signal passed through the second filter 210b.

  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 this embodiment, the same effect as that of the first embodiment can be obtained.

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

  As shown in FIG. 10, the transmission system of the fourth embodiment of the present invention differs from the transmission system of the first embodiment of the present invention shown in FIG. 1 in that the transmission high frequency unit 204 is included. The other components are the same as those in the first embodiment shown in FIG. 1, and therefore the corresponding components are denoted by the same reference numerals as in FIG.

  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 unit 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 generator 234a, and a fourth signal. The second predetermined signal generating unit 234 b includes a first up converter 244, a second up converter 274, a first amplification unit 250, and a second amplification unit 280.

  For example, the first predetermined signal generating unit 234a, the second predetermined signal generating unit 234b, the first upconverter 244, the second upconverter 274, the first amplification unit 250, and the second amplification unit 280 It is realized by a plurality of circuits.

  As in the first embodiment, the signals transmitted by the transmission control unit 100 are input to the first filter 210a, the second filter 210b, and the third filter 210c.

  As in the first embodiment, the first filter 210a is configured to pass only the first signal. The second filter 210b is configured to pass only the second signal. The third filter 210c is configured to pass only the third signal.

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

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

  The first up-converter 244 converts the frequency of the first signal to a frequency in the higher RF band using the input seventh signal. Then, the first up-converter 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 the amplified first signal to the antenna 310.

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

  The second up-converter 274 converts the frequency of the second signal to a frequency in the higher RF band using the input eighth signal. Then, the second up-converter 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 the amplified second signal to the antenna 320. Note 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 up-converter 244 includes, for example, a multiplier and a filter. Then, for example, a seventh signal is input to the multiplier, the seventh signal is multiplied by the first signal in the first up-converter 244, and a signal of the multiplication result is input to the filter. . Among the signals of the multiplication result input to the filter, the higher frequency signal passes through the filter and is input to the first amplification unit 250.

  Also, the second up-converter 274 includes, for example, a multiplier and a filter. Then, for example, an eighth signal is input to the multiplier, and the second up converter 274 multiplies the eighth signal and the fourth signal, and a signal of the multiplication result is input to the filter. . Among the signals of the multiplication result input to the filter, the higher frequency signal passes through the filter and is input to the second amplification unit 280.

  According to the present embodiment, the transmission high frequency unit 204 synchronizes each other based on the signal transmitted from the transmission control unit 100, and radiates the signals having the same frequency as each other through the antennas 310 and 320. can do.

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

Embodiment 5
Next, a signal output apparatus according to a 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 a signal output device 10 according to a fifth embodiment of the present invention.

  As shown in FIG. 12, a signal output device (for example, corresponding to the transmission control unit 100 in the first embodiment) 10 according to the fifth embodiment of the present invention includes a signal generation unit (signal generation means) 15 and an output. A unit (output means) 16 and a pilot data generation unit (pilot data generation means) 14 are included.

  The signal generation unit 15 corresponds to, for example, the first orthogonal modulation unit 150 a and the second orthogonal modulation unit 150 b in the first embodiment. The output unit 16 corresponds to, for example, the multiplexing unit 160 in the first embodiment. Also, the pilot data generation unit 14 corresponds to, for example, the pilot data generation unit 140 in the first embodiment.

  The signal generation unit 15 generates a first signal according to the first data, generates a second signal having a frequency different from that of the first signal according to the second data, and generates the third data. In response, a third signal is generated to adjust the frequency of the second signal in the signal transmission apparatus (for example, corresponding to the transmission high frequency unit 200 in the first embodiment).

  The output unit 16 outputs the first signal, the second signal, and the third signal to the signal transmission device.

  The pilot data generation unit 14 generates third data.

  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.

  Also, the pilot data generation unit 14 generates third data such that the third signal synchronizes with the first signal and the second signal.

  According to the present embodiment, the pilot data generation unit 14 generates the third data so that the third signal synchronizes 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. A third signal is generated for adjusting the frequency of the second signal in the signal transmission device according to the data. 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 through fewer cables while suppressing an increase in circuit scale.

  Note that each signal output device, signal transmission system, signal output method, and program for signal output according to each embodiment described above are utilized to provide a broadcast service. Such broadcast services include, for example, terrestrial digital broadcasting, BS (Broadcasting Satellite) digital broadcasting, CS (Communication Satellite) digital broadcasting, highly narrowband satellite digital broadcasting, and highly wideband digital broadcasting. The present invention is not limited to these, and includes various other broadcast services.

  Also, the broadcast service is not limited to the broadcast service provided by a broadcaster including a broadcast station that provides a broadcast service based on the Japanese broadcast standard, and provides a broadcast service based on a broadcast standard other than Japan. It may also be provided by the broadcaster. The broadcast service also includes next-generation broadcast services transmitted via a plurality of different transmission paths, such as broadcast and communication.

DESCRIPTION OF SYMBOLS 10 Signal output apparatus 14,140,142 Pilot data generation part 15 Signal generation part 16 Output part 100,102 Transmission control part 110 Individual data generation part 120a 1st IFFT processing part 120b 2nd IFFT processing part 130 synthetic part 150a 1 orthogonal modulation unit 150b second orthogonal modulation unit 160 multiplexing unit 200, 203 transmission high frequency unit 210a first filter 210b second filter 210c third filter 210d fourth filter 220 delay processing unit 230 supply signal generating unit 234a first predetermined signal generator 234b second predetermined signal generator 240, 244 first up-converter 250 first amplifier 260 multiplier 263 corresponding signal generator 270, 274 second up-converter 280 second Amplifier 300 Cable 310, 32 Antenna

Claims (8)

A first signal is generated according to the first data, and a second signal different in frequency from the first signal is generated according to the second data, and the second signal is generated according to the third data. Signal generation means for generating a third signal for adjusting the frequency of the signal at the signal transmission apparatus;
Output means for outputting the first signal, the second signal, and the third signal to the signal transmission device;
Pilot data generating means for generating the third data;
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 one another;
A signal output device characterized in that the pilot data generation means generates the third data so that the third signal synchronizes with the first signal and the second signal. It further comprises combining means for multiplexing the third data with the second data,
The pilot data generation means
The third data corresponding to the third signal is set so that the sum of the value of the frequency of the second signal and the value of the frequency of the third signal becomes the value of the frequency of the first signal. The signal output device according to claim 1. The signal generation means
First signal generation means for generating the first signal based on the first data;
3. The signal output according to claim 2, further comprising: second signal generation means for generating the second signal based on the second data and generating the third signal based on the third data. apparatus. The output unit transmits the first signal, the second signal, and the third signal to the signal transmission device through one path. The signal output device described in. A signal output device according to any one of claims 1 to 4;
A signal transmission system comprising: the signal transmission apparatus. An electromagnetic wave according to the first data and the second data is transmitted using the signal transmission system according to claim 5;
According to the broadcast service providing method, a television receiver sends out an electromagnetic wave generated so as to be able to decode data according to the first data and the second data based on the received electromagnetic wave. . A first signal is generated according to the first data, and a second signal different in frequency from the first signal is generated according to the second data, and the second signal is generated according to the third data. Generating a third signal for adjusting the frequency of the signal at the signal transmission apparatus;
Outputting the first signal, the second signal, and the third signal to the signal transmission device;
Generating pilot data to generate the third data;
The first signal and the second signal are synchronized with each other,
At the output step, the first signal, the second signal and the third signal are multiplexed together;
And generating the third data so that the third signal synchronizes with the first signal and the second signal in the pilot data generation step. On the computer
A first signal is generated according to the first data, and a second signal different in frequency from the first signal is generated according to the second data, and the second signal is generated according to the third data. Signal generation processing for generating a third signal for adjusting the frequency of the signal at the signal transmission apparatus;
An output process of outputting the first signal, the second signal, and the third signal to the signal transmission device;
Executing pilot data generation processing for generating the third data;
The first signal and the second signal are synchronized with each other,
The output processing multiplexes the first signal, the second signal and the third signal with each other,
A program for signal output for generating the third data so that the third signal synchronizes with the first signal and the second signal in the pilot data generation process.

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