JP2006033742A - Channel frequency interval setting transmission device, channel frequency interval setting transmission program, and channel setting information generation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a channel frequency interval setting transmission device and channel frequency capable of performing channel arrangement (channel selection) of broadcasting / communication signals (transmission signals) without deteriorating transmission characteristics and without increasing the cost of transmission facilities. An interval setting transmission program and a channel setting information generation method are provided.
A channel frequency interval setting transmission device 1 transmits a plurality of received signals as a plurality of transmission signals to a broadcast / communication transmission path to which channels or frequencies are assigned. The information storage means 3, the received signal distribution means 5, the frequency conversion means 7, and the transmission signal mixing means 9 are provided.
[Selection] Figure 1

Description

  The present invention sets a channel or frequency interval in a broadcasting / communication transmission line, and sets a channel frequency interval setting transmission device, a channel frequency interval setting transmission program, and a channel or frequency interval for transmitting a transmission signal. The present invention relates to a channel setting information generation method for generating channel setting information.

  In general, when channels are allocated at equal frequency intervals within a transmission band for transmitting broadcast / communication signals, this is one of the problems (characteristics) of transmission equipment (transmission equipment) that transmits the broadcast / communication signals. It is known that an intermodulation distortion due to a certain non-linearity affects a broadcast / communication signal within a transmission band (deterioration of signal quality) (see, for example, Non-Patent Document 1).

  Note that intermodulation distortion is nonlinear distortion that occurs when an input signal has two or more frequency components, and the frequency of the sum of integer multiples or the difference of integer multiples appears in the output signal. For example, two transmission signals (f2 = f1 + Δ, f3 = f1−) arranged at equal intervals on the upper side and the lower side of the target signal (broadcast / communication signal to be transmitted, target wave, frequency f1). When Δ is present, the frequency of the sum and difference of the three signals is −f1 + f2 + f3 = −f1 + (f1 + Δ) + (f1−Δ) = f1, and the same frequency as the target signal is disturbed. Become.

  Normally, when broadcasting / communication signals are transmitted, channels are allocated at equal frequency intervals so that the bandwidth of the broadcasting / communication signal transmission can be efficiently used and frequency conversion can be easily performed. There are many. Therefore, when channels are assigned at equal frequency intervals and broadcast / communication signals of many channels are transmitted simultaneously, transmission is performed due to the non-linear characteristics of the mixer and RF amplifier circuit that constitute the transmission equipment (transmission device). The same channel as the target signal to be disturbed causes a deterioration in the quality of the broadcast / communication signal (see Non-Patent Document 1, for example).

  Conventionally, in order to reduce this intermodulation distortion, a circuit that compensates for the nonlinearity of the broadcast / communication signal is added to the transmission equipment, and the amplification circuit that amplifies the broadcast / communication signal, which is the main cause of the nonlinearity. And install a device with a larger maximum output of the amplifier circuit (depending on the type of broadcasting / communication signal to be modulated, required performance of transmission equipment, cost), and sufficient backoff (when operating in the transmission equipment) The difference between the power level and the output saturated power level) is ensured, the transmission equipment is operated, and broadcast / communication signals are transmitted.

  In addition, devise channels to be used for broadcasting / communication signals. For example, in broadcasting / communication signals, the frequency relationship of channels is clear. By providing, it is possible to prevent the occurrence of a disturbing signal falling into the broadcast / communication signal, and to reduce the influence of intermodulation distortion.

  However, as the number of broadcast / communication signals to be transmitted increases, channel selection may become complicated, and a channel arrangement (channel selection) that prioritizes reduction of intermodulation distortion is not used.

  Examples of this channel arrangement include a terrestrial analog television broadcast channel arrangement (channel selection), a terrestrial digital television broadcast channel arrangement, and a CATV channel arrangement (see, for example, Patent Document 1). It is done.

  In the channel arrangement (channel selection) of terrestrial analog television broadcasting, in order to suppress the occurrence of interference by adjacent channels (hereinafter referred to as “adjacent channel interference”), the channel arrangement (channel selection) is arranged every two channels. ) Is used in many cases.

  In the channel arrangement (channel selection) of terrestrial digital television broadcasting, the channel arrangement (channel selection) considering the prevention of interference with the broadcasting wave of terrestrial analog television broadcasting and frequency use efficiency is adopted as the most important point. ing.

In the CATV channel arrangement (channel selection), not only broadcast waves of terrestrial analog television broadcasts and broadcast waves of digital terrestrial television broadcasts, but also many broadcasts by satellite broadcasts, independent broadcasts in the local area, etc.・ Because communication signals are transmitted within a limited transmission band, the frequency and frequency of the broadcast / communication signals of each broadcast wave are converted, and the modulation method may be changed depending on the case. The so-called adjacent channel transmission is performed, in which transmission is performed in a channel arrangement (channel selection) packed with.
Eiichiro Kawakami and 4 others, “Development of Millimeter-Wave Video Multiplexing System II —Experimental Consideration on Nonlinear Distortion—” 2001 IEICE General Conference, C-2-98 JP 2002-204436 A (paragraphs 0058 to 0063, FIG. 4)

  However, in the conventional channel arrangement (channel selection), when a plurality of broadcast / communication signals pass through the amplification circuit of the transmission equipment (when amplified), it is due to nonlinearity which is one of the problems (characteristics) of the transmission equipment. Intermodulation distortion occurs. In particular, as described in the background art, when channels are arranged at equal intervals or when adjacent channel transmission is performed, the generated intermodulation distortion overlaps, resulting in large interference within the band of the broadcast / communication signal to be transmitted. There is a problem that a signal is generated and transmission characteristics (equivalent CN ratio [carrier noise rate]) are deteriorated.

  Also, adding a circuit that compensates for non-linearity and reducing the intermodulation distortion and installing a circuit with a larger maximum output of the amplifier circuit leads to an increase in the cost of transmission equipment. In particular, when the broadcast / communication signal is a millimeter wave, it is difficult to manufacture an amplifier circuit with a large output, and there is a problem that the cost of the transmission equipment is greatly increased.

  Therefore, in the present invention, it is possible to perform channel arrangement (channel selection) of broadcasting / communication signals (transmission signals) without solving the above-described problems and without degrading transmission characteristics and without increasing the cost of transmission facilities. An object of the present invention is to provide a channel frequency interval setting transmission device, a channel frequency interval setting transmission program, and a channel setting information generation method for generating channel setting information which is information for setting a channel arrangement.

  In order to solve the above-mentioned problem, the channel frequency interval setting transmission apparatus according to claim 1 transmits a plurality of received signals as a plurality of transmission signals to a broadcast / communication transmission path to which a channel or a frequency is assigned. The channel frequency interval setting transmission device is configured to include channel setting information storage means, received signal distribution means, frequency conversion means, and transmission signal mixing means.

  According to such a configuration, the channel frequency interval setting transmission apparatus performs transmission by converting the reception channel of the extracted reception signal extracted from the plurality of reception signals and the frequency of the extracted reception signal extracted in the channel setting information storage unit. It stores channel setting information, which is information related to signal transmission channels. In this channel setting information, the transmission signal is set so that the channel interval which is the interval between the channels of any two signals in the transmission signal or the frequency interval which is the frequency interval is all different, and is preset for each received signal. The channel to be extracted (reception channel) is set according to the channel (channel number) being set, and the transmission channel (transmission channel number) of the transmission signal (broadcast / communication signal) converted from the frequency of the extracted extracted reception signal is set. It is a thing. For example, when the received signal is a terrestrial digital signal, the channel number of the terrestrial digital signal is extracted (extracted) according to the information regarding the received channel in the channel setting information. Then, the frequency of the extracted (extracted) terrestrial digital signal is converted according to the information on the transmission channel of the channel setting information.

  Subsequently, the channel frequency interval setting transmission device distributes the reception signals to a preset number by the reception signal distribution unit, and converts the reception signals distributed by the reception signal distribution unit by the frequency conversion unit into channel setting information. Extraction is performed according to the included reception channel, and the extracted extracted reception signal is frequency-converted and output according to the transmission channel included in the channel setting information. The frequency conversion means is provided for the number of times the reception signal is distributed by the reception signal distribution means, and frequency-converts the extracted reception signals so that, for example, the frequency intervals of adjacent transmission signals after frequency conversion are all different. .

  And this channel frequency interval setting transmission apparatus mixes and outputs the transmission signal whose frequency is converted by the frequency conversion means by the transmission signal mixing means. In this transmission signal mixing means, the transmission signals are mixed and output so as to match the transmission path connected to the apparatus.

  3. The channel frequency interval setting transmission program according to claim 2, wherein the received signal distribution means comprises a device for transmitting a plurality of received signals as a plurality of transmission signals to a broadcast / communication transmission line to which channels or frequencies are assigned. , Frequency conversion means and transmission signal mixing means.

  According to such a configuration, the channel frequency interval setting transmission program distributes the reception signals to a preset number by the reception signal distribution means. The channel frequency interval setting transmission program includes a reception channel of an extracted reception signal for extracting the reception signal distributed by the reception signal distribution unit by the frequency conversion unit from a plurality of reception signals, and the extracted reception signal of the extracted reception signal. The received signal is extracted according to the reception channel included in the channel setting information, which is information related to the transmission channel of the transmission signal to be converted and transmitted, and the extracted received signal is frequency-converted according to the transmission channel included in the channel setting information. Convert and output. The channel frequency interval setting transmission program mixes and outputs the transmission signal whose frequency is converted by the frequency conversion means by the transmission signal mixing means. In the channel setting information, the transmission signal is set so that the channel interval which is the interval between the channels of any two signals in the transmission signal or the frequency interval which is the frequency interval is all different.

  The channel setting information generation method according to claim 3, wherein a plurality of received signals are transmitted as a plurality of transmission signals to a broadcast / communication transmission line to which channels or frequencies are assigned. Alternatively, a channel setting information generation method for generating channel setting information for setting a frequency, which includes a channel frequency calculation step and a channel frequency setting step.

According to such a procedure, the channel setting information generation method, in the channel frequency calculation step, from both sides of the maximum value and the minimum value of the preset channel or frequency,
That is, any two transmissions already set as candidates for the channel or frequency of the transmission signal from both sides of the smaller channel number or frequency near the minimum value and the larger channel number or frequency near the maximum value. Calculate the minimum value that does not equal the signal channel spacing or frequency spacing. For example, since the transmission signal of the UHF band is from 13 ch to 62 ch, the channel of the transmission signal is set from the values at both ends of the maximum value 62 and the minimum value 13. Subsequently, in the channel frequency setting step, in the channel frequency setting step, based on the minimum value calculated in the channel frequency calculation step, the channel or frequency minimum value side, or the channel or frequency maximum value side, Set the interval or frequency interval value.

  The channel setting information generation method according to claim 4 is the channel setting information generation method according to claim 3, wherein the channel frequency calculation step is performed from both sides of a preset maximum value or minimum value of the channel or frequency. As a candidate for the channel interval or frequency interval of the transmission signal, when calculating the minimum value among those that are not the same as the channel interval or frequency interval of any two transmission signals that have already been set, The channel interval or frequency interval value set for the subchannel on the minimum value side, and the channel interval or frequency interval value set on the subchannel on the maximum value side of the channel or frequency are respectively set to the subchannels. It is characterized in that it can be replaced and set.

  According to such a procedure, the channel setting information generation method has already started from the preset maximum and minimum values and values on both sides (for example, in the case of the UHF band, the minimum value is 13 ch and the maximum value is 62 ch). Among the set channels, the value of the interval between the values of the corresponding channel (the value of the channel interval set in the subchannel on the maximum value side) and the value of the interval between the values of the corresponding channel (smaller value) The channel interval value set in the subchannel on the minimum value side) can be exchanged in each subchannel. For example, when 13ch is selected as the minimum value in the UHF band and “1” and “4” are set as channel intervals in the subchannel on the minimum value side of the channel number (when the channel number is set, 13ch, 14ch and Next, when calculating the channel interval, it is also possible to replace the already set values “1” and “4”, so “6” is selected as the channel interval candidate. In this case, the channel spacing is not simply “1”, “4”, “6”, but “1”, “6”, “4”, “4”, “6”, “1”, “4”. ”,“ 1 ”,“ 6 ”,“ 6 ”,“ 1 ”,“ 4 ”,“ 6 ”,“ 4 ”,“ 1 ”.

  According to the first and second aspects of the invention, the distributed reception signal is extracted according to the information about the reception channel of the channel setting information, and the frequency of the extracted reception signal is converted according to the information about the transmission channel of the channel setting information. Yes. This channel setting information is such that channel intervals or frequency intervals of the transmission signal are all different, and it is possible to avoid third-order intermodulation distortion that is distortion that falls into a certain transmission signal itself. For this reason, it is not necessary to provide a circuit for compensating non-linearity as compared with the conventional transmission device (transmission equipment) without deteriorating the transmission characteristics of the transmission signal, and it is not necessary to install a device having a large maximum output of the amplifier circuit. Therefore, the channel selection (channel arrangement) of the transmission signal (broadcast / communication signal) can be performed without increasing the cost of the transmission apparatus (transmission equipment).

  According to the third aspect of the present invention, as channel setting information, any two already set as channel interval or frequency interval candidates of the transmission signal from both sides of the preset maximum value and minimum value of the channel. Since the minimum value is calculated and the information about the transmission channel is generated among those that do not have the same value as the channel interval or frequency interval of two transmission signals, the third-order intermodulation distortion that is the distortion that occurs in the transmission signal itself is avoided. Since this third-order intermodulation distortion can be suppressed to the minimum, it is possible to prevent deterioration of transmission characteristics.

  According to the fourth aspect of the present invention, as channel setting information, the value of the channel interval or frequency interval set in the subchannel on the minimum value side from both sides of the preset maximum value and minimum value of the channel. And the channel interval or frequency interval value set in the subchannel on the maximum value side can be interchanged in each subchannel, and the channel interval or frequency interval of any two transmission signals that have already been set Since the minimum value is calculated and the information about the transmission channel is generated among those that do not have the same value, it is possible to avoid third-order intermodulation distortion that is distortion generated in the transmission signal itself. Since the intermodulation distortion can be suppressed to a minimum, it is possible to prevent deterioration of transmission characteristics.

Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
<Configuration of channel frequency interval setting transmission device>
FIG. 1 is a block diagram of a channel frequency interval setting transmission apparatus. As shown in FIG. 1, a channel frequency interval setting transmission device 1 transmits a channel (channel number) arrangement or frequency of a received signal received to an external transmission line 2 as a transmission signal obtained by converting the frequency. Setting information storage means 3, reception signal distribution means 5, frequency conversion means 7 (7a, 7b, 7c, 7d, 7e, 7f, 7g, 7h, 7i) and transmission signal mixing means 9 are provided.

  FIG. 1 does not show a specific circuit configuration of the channel frequency interval setting transmission device, but can be said to be a functional configuration diagram conceptually (functionally) showing the operation of the device. Further, the transmission path 2 may be a so-called space (propagation space where radio waves propagate) or a communication line such as a network.

  The channel setting information storage means 3 is composed of a hard disk or the like, and stores channel setting information set in advance. The channel setting information is input and accumulated by an operation unit such as a keyboard having a numeric keypad (not shown) or a rotary switch.

  This channel setting information sets a channel to be extracted (reception channel) by a channel (channel number) set in advance for each reception signal, and transmits a transmission channel (transmission channel of the transmission signal obtained by converting the frequency of the extracted reception signal to be extracted). Transmission channel number).

  For example, the received signal is a terrestrial digital signal in the UHF band (13 ch to 62 ch), and the terrestrial digital signal in this UHF band is adjacent to 9 waves (consecutive channel numbers are used. Here, 13 ch , 14 ch, 15 ch, 16 ch, 17 ch, 18 ch, 19 ch, 20 ch, 21 ch), the channel number of the UHF band terrestrial digital signal (9 waves from 13 ch to 21 ch) according to the information about the receiving channel of the channel setting information Is extracted (extracted) by the frequency converting means 7. Then, the frequency of the extracted (extracted) terrestrial digital signal is converted by the frequency converting means 7 according to the information on the transmission channel of the channel setting information (details are shown in FIGS. 2 to 4). (It will be described later).

  The reception signal distribution means 5 receives a signal being propagated (here, a UHF band terrestrial digital signal) as a reception signal, and distributes this reception signal to a preset number. It has.

  The receiving antenna 5a is a known antenna capable of receiving a UHF band terrestrial digital signal (a terrestrial digital broadcast signal), and is configured by a general Yagi antenna.

  The distribution signals (the same as the output signal and the reception signal) distributed by the reception signal distribution unit 5 are output (supplied) to the frequency conversion unit 7 (7a to 7i), respectively.

  Based on the channel setting information stored in the channel setting information storage unit 3, the frequency conversion unit 7 (7 a to 7 i) receives from the distribution signal (the same as the output signal and the reception signal) to the reception channel (reception channel number, 13 ch to 21ch) is extracted (extracted) and output as a transmission signal obtained by converting the frequency of the extracted received signal.

  In other words, the extracted reception signal of the reception channel 13ch is extracted by the frequency conversion means 7a, the frequency is converted, the reception signal of the reception channel 14ch is extracted by the frequency conversion means 7b, the frequency is converted, and the reception channel is converted by the frequency conversion means 7c. The 15ch reception signal is extracted and the frequency is converted. The frequency conversion means 7d extracts the reception signal of the reception channel 16ch and converts the frequency. The frequency conversion means 7e extracts the reception signal of the reception channel 17ch and the frequency is changed. Then, the frequency conversion means 7f extracts the reception signal of the reception channel 18ch and converts the frequency, the frequency conversion means 7g extracts the reception signal of the reception channel 19ch and converts the frequency, and the frequency conversion means 7h converts the frequency. The extracted received signal 20ch is frequency converted and the frequency is converted is extracted received signal of the receiving channel 21ch is the frequency conversion means 7i.

  For the transmission channel (transmission channel number) of the transmission signal whose frequency is converted by the frequency conversion means 7, the transmission channel of the transmission signal converted by the frequency conversion means 7a is "I" (here, 13ch to 62ch UHF). Terrestrial digital signal of band, I = 13), the transmission channel of the transmission signal converted by the frequency conversion means 7b is “I + 2”, and the transmission channel of the transmission signal converted by the frequency conversion means 7c Is “I + 7”, the transmission channel of the transmission signal converted by the frequency conversion means 7d is “I + 15”, the transmission channel of the transmission signal converted by the frequency conversion means 7e is “I + 26”, and the frequency conversion means The transmission channel of the transmission signal converted by 7f is “I + 38”, and the transmission channel is converted by the frequency conversion means 7g. The transmission channel of the transmission signal is “I + 44”, the transmission channel of the transmission signal converted by the frequency conversion unit 7h is “I + 47”, and the transmission channel of the transmission signal converted by the frequency conversion unit 7i is “I + 48”. .

  That is, in this frequency conversion means 7, if “I” is designated (specified) by the information regarding the transmission channel of the channel setting information, the transmission channel of the transmission signal is “I”, “I + 2”, “I + 7”, “ “I + 15”, “I + 26”, “I + 38”, “I + 44”, “I + 47”, “I + 48”.

  The transmission signal mixing unit 9 mixes the transmission signals whose frequencies are converted by the frequency conversion unit 7 (7a to 7i) and outputs the mixed signal to the external transmission path 2.

<Example of channel arrangement (channel selection)>
Here, with reference to FIGS. 2 to 4, an example of the arrangement (assignment, selection) of transmission channels (transmission channel numbers) of transmission signals converted by the frequency conversion means 7 will be described.
FIG. 2 shows an example of a channel arrangement (first example of channel assignment) when the UHF band is used as a transmission channel (transmission channel number) of a transmission signal.

  As shown in FIG. 2, when transmitting 9 waves (hatched portion) of 13ch, 15ch, 20ch, 28ch, 39ch, 51ch, 57ch, 60ch and 61ch in the UHF band, the transmission channels of any two transmission signals ( There are 36 (9 × 8/2) combinations of intervals (channel intervals) of transmission channel numbers (channel numbers in FIG. 2).

  The 36 combinations of channel intervals are “1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 18, 19, 21, 22, 23, 24. 26, 29, 31, 32, 33, 36, 37, 38, 40, 41, 42, 44, 45, 46, 47, 48 ", and the 36 channel intervals are all set to different values. Has been.

  FIG. 3 shows an example of a channel arrangement (second example of channel assignment) when the UHF band is used as a transmission channel (transmission channel number) of a transmission signal.

  As shown in FIG. 3, when transmitting 9 waves (hatched portion) of 13ch, 15ch, 18ch, 27ch, 35ch, 50ch, 54ch, 60ch and 61ch in the UHF band, the transmission channels of any two transmission signals ( There are 36 (9 × 8/2) combinations of intervals (channel intervals) of transmission channel numbers (channel numbers in FIG. 3).

  The 36 combinations of channel intervals are “1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 17, 19, 20, 22, 23, 25. 26, 27, 32, 33, 34, 35, 36, 37, 39, 41, 42, 43, 45, 46, 47, 48 ", and the 36 channel intervals are all set to different values. Has been.

  FIG. 4 shows an example of a channel arrangement (third example of channel assignment) when the UHF band is used as a transmission channel (transmission channel number) of a transmission signal.

  As shown in FIG. 4, when transmitting 9 waves (hatched portion) of 13ch, 15ch, 18ch, 31ch, 43ch, 51ch, 52ch, 58ch and 62ch in the UHF band, the transmission channels of any two transmission signals ( There are 36 (9 × 8/2) combinations of intervals (channel intervals) of transmission channel numbers (channel numbers in FIG. 4).

  The 36 combinations of channel intervals are “1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 18, 19, 20, 21, 25. 27, 28, 30, 31, 33, 34, 36, 37, 38, 39, 40, 43, 44, 45, 47, 49 ”, and the 36 channel intervals are all set to different values. Has been.

  As described above, when the transmission channel (transmission channel number) of the transmission signal is set so that the channel intervals are all different values, the influence of the intermodulation distortion on the transmission channel of the selected transmission signal can be reduced. it can.

<Comparison between channel frequency interval setting transmission equipment and conventional transmission equipment>
Here, a comparison between the channel frequency interval setting transmission apparatus 1 and the conventional transmission equipment will be described with reference to FIG.

  First, the transmission equipment will be described again. When a plurality of transmission signals pass through an amplification circuit or the like installed in a transmission facility, the frequency of intermodulation distortion caused by the nonlinearity of the amplification circuit is generated (determined) by the combination of the frequencies of the transmission signals, and the channel interval Is constant, a plurality of intermodulation distortions may be concentrated on the transmission channel of one transmission signal.

  For example, when a plurality of transmission signals are arranged in adjacent channels, or when channels are arranged at equal intervals, a large amount of third-order intermodulation distortion occurs in the transmission channel near the center of the channel arrangement. Become.

  This third-order intermodulation distortion adversely affects the transmission signal. If this third-order intermodulation distortion exceeds a certain amount, for example, in the case of terrestrial analog television broadcasting, the TV on the receiving side that receives the transmission signal. The screen displayed on the screen is less than the practical limit, or in the case of terrestrial digital television broadcasting, block noise appears on the screen displayed on the receiving TV that receives the transmission signal, and the screen is extremely disturbed ( Or fail).

  Therefore, the conventional transmission equipment transmits 9 channels of 13ch, 14ch, 15ch, 16ch, 17ch, 18ch, 19ch, 20ch and 21ch in the UHF band on the adjacent channel, and the channel frequency interval setting transmission device 1 performs FIG. FIG. 5 shows the wave number of the third-order intermodulation distortion in the case where the 9-wave transmission signals of 13 ch, 15 ch, 20 ch, 28 ch, 39 ch, 51 ch, 57 ch, 60 ch and 61 ch in the UHF band shown in FIG.

  As shown in FIG. 5, when 9 waves are transmitted in adjacent channels by the conventional transmission equipment, the third-order intermodulation distortion is concentrated in the transmission channel of the transmission signal, and the maximum is 24 in one transmission channel. Wave intermodulation distortion has occurred. On the other hand, when a transmission signal of 9 waves is transmitted by the channel frequency interval setting transmission apparatus 1 which is an embodiment of the present invention, the intermodulation distortion spreads over the entire UHF band, but is used for the transmission signal. In the transmission channel, no intermodulation distortion of one wave occurs.

  Thus, in the channel frequency interval setting transmission apparatus 1, by performing channel arrangement (channel selection) so that the transmission channel intervals of two arbitrarily transmitted transmission signals are different, and transmitting the transmission signals, The adverse effects due to non-linearity can be minimized.

  That is, according to the channel frequency interval setting transmission device 1, the channel setting information storage means 3 converts the reception channel of the reception signal extracted from the plurality of reception signals and the frequency of the extracted reception signal after conversion. Channel setting information, which is information related to signal transmission channels, is accumulated. Subsequently, the reception signal distribution means 5 distributes the reception signals to a preset number, and the frequency conversion means 7 extracts the reception signals distributed by the reception signal distribution means 5 according to the reception channel of the channel setting information, The extracted received signal is frequency-converted and output according to the transmission channel included in the channel setting information. Then, the transmission signal whose frequency is converted by the frequency conversion means 7 is mixed and output by the transmission signal mixing means 9. For this reason, since this third-order intermodulation distortion can be suppressed to the minimum, it is not necessary to provide a circuit for compensating non-linearity as compared with the conventional transmission apparatus (transmission equipment) without deteriorating the transmission characteristics, and the amplifier circuit Since it is not necessary to install a device having a large maximum output, it is possible to perform channel selection (channel arrangement) of transmission signals without increasing the cost of the transmission device (transmission equipment).

<Operation of channel frequency interval setting transmission device>
Next, the operation of the channel frequency interval setting transmission apparatus 1 will be described with reference to the flowchart shown in FIG. 6 (see FIG. 1 as appropriate). In the channel frequency interval setting transmission apparatus 1, channel setting information is stored in the channel setting information storage unit 3 in advance.

  First, the channel frequency interval setting transmission apparatus 1 receives a UHF band terrestrial digital signal by the reception antenna 5a of the reception signal distribution means 5, and the reception signal distribution means 5 sets a preset number (9). (Step S1).

  Then, the channel frequency interval setting transmission apparatus 1 is configured to store the reception signal (distributed signal, output signal) distributed by the reception signal distribution unit 5 by the frequency conversion unit 7 and stored in the channel setting information storage unit 3. Extracted (extracted) according to the information about the reception channel included in the information, frequency-converted the extracted (extracted) received signal according to the information about the transmission channel included in the channel setting information, and transmitted the frequency converted reception signal to the transmission signal To the transmission signal mixing means 9 (step S2).

  Thereafter, the channel frequency interval setting transmission apparatus 1 mixes the transmission signals output from the respective frequency conversion means 7 by the transmission signal mixing means 9 and outputs them to the external transmission line 2 (step S3).

<How to set channel setting information>
Next, a method for setting channel setting information (channel setting information generation method) input to the channel frequency interval setting transmission apparatus 1 will be described with reference to FIGS.
7 to 9 are explanatory diagrams for explaining how to set the channel arrangement of the first example of channel assignment and the second example of channel assignment shown in FIGS. 2 and 3.

  In FIG. 7, FIG. 7 (a) explains the operation contents when setting the channel setting information, and FIG. 7 (b) explains the operation results when actually obtaining the channel setting information. Is.

  As shown in <condition setting> of FIG. 7A, the largest channel number: Chmax, the smallest channel number: Chmin, and the channel arrangement from both sides (both ends) of the larger and smaller channels. Will be set. Here, the number of signals (transmission signals) to be transmitted is N.

  Then, all channel intervals are set to 0 in <Initial setting of channel intervals> in FIG. Here, Cw (1) indicates the channel interval between the smallest channel number and the second smallest channel number (hereinafter referred to as the first channel interval), and Cw (2) is the second smallest channel. The channel interval between the number and the third smallest channel number (hereinafter referred to as the second channel interval) is shown. Cw (N-1) represents the channel interval between the (N-1) th smallest channel number and the Nth smallest (largest) channel number (hereinafter referred to as the N-1th channel interval). ing.

  In <Calculation of channel interval> in FIG. 7A, calculation on the side with the larger channel (channel number) (HCAL) and calculation on the side with the smaller channel (channel number) (LCAL) are performed to set FLAG. These <initial setting of channel interval> and <calculation of channel interval> correspond to the channel frequency calculation step of the channel setting information generation method.

  Then, the transmission channel of the transmission signal is determined by FLAG (flag) in the calculation of the channel interval. The processing portion based on the FLAG value corresponds to the channel frequency setting step of the channel setting information generation method.

  In any of the calculation and setting of the channel spacing, as shown in FIGS. 8 (a), 8 (b), 9 (a), and 9 (b), the side with the larger channel number (the maximum value side). ) And the smaller side (minimum value side), the channel setting information is processed. In other words, by setting a small numerical channel interval from both ends of the channel number, the channel on the larger and smaller channel numbers can be set completely independently in the first half of setting the transmission channel.

  In the example shown in FIGS. 7A and 7B, until the fifth channel interval setting, the frequency of the third-order intermodulation distortion is higher on the channel number side, and on the lower channel number side. Since they are not related to each other, channel arrangement (generation of channel setting information) can be performed as an arrangement of independent subchannels. For this reason, even when the number of transmission channels of the transmission signal increases, the channel arrangement (generation of channel setting information) can be relatively easily advanced.

  10 to 12 are explanatory diagrams for explaining how to set the channel arrangement of the third example of the channel assignment shown in FIG.

  In FIG. 10, FIG. 10 (a) illustrates the operation contents when setting the channel setting information, and FIG. 10 (b) illustrates the operation results when actually obtaining the channel setting information. Is.

In principle, the channel arrangement shown in FIGS. 10A and 10B is also set by assigning a small numerical value as the channel interval from both sides (both ends) of the channel number. However, in the middle of setting the transmission channel,
It is possible to switch between subchannels on the side with the smaller channel number (minimum value side) and the side with the larger channel number (maximum value side).

  In the channel arrangement setting method shown in FIG. 10B, Cw (6) = 4 and Cw (7) = 6 are set for the subchannel having the larger channel number before the sixth channel interval setting. , Cw (8) = 1. In the sixth channel interval setting, Cw (5) = 8 is selected. At this time, the channel intervals in the subchannels are changed, and Cw (6) = 1, Cw (7) = 6, Cw ( 8) = 4.

  In this case, as shown in FIG. 11 (a), FIG. 11 (b), FIG. 12 (a), and FIG. The channel setting information is processed for each sub-channel with the smaller side. By setting a small numerical channel interval from both ends of the channel number, in the first half of setting the transmission channel, the subchannels with the larger and smaller channel numbers can be set completely independently. .

  In addition, the arrangement of the subchannels formed on both sides (both ends) of the channel number can be exchanged, which is somewhat more complicated than the channel arrangement setting method shown in FIG. Even when the number increases, it is possible to increase the number of possible combinations of channel settings.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment. For example, in this embodiment, the terrestrial digital signal of 9 waves has been described as an example, and UHF band 13ch has been described as the minimum channel (channel number). However, two transmission signals (broadcasting) used for the broadcast / communication transmission path・ If the channel interval or frequency interval of the transmission signal is selected (set) so that the channel interval or frequency interval of the communication signal is not equal (all different), The present invention is not limited, and can be applied to terrestrial analog signals, transmission signals such as CATV, and the like.

  For example, the transmission channels “I, I + 2, I + 7, I + 15, I + 26, I + 38, I + 44, I + 47, I + 48: I = 13” of the transmission signal shown in FIG. I + 44, I + 47, I + 48: I = 14 ”,“ I, I-2, I-7, I-15, I-26, I-38, I-44, I-47, I-48: "I = 62" or "I, I-2, I-7, I-15, I-26, I-38, I-44, I-47, I-48: I = 61" In this way, the same effect can be obtained.

  Furthermore, as an application example of the channel frequency interval setting transmission device 1, for example, use in a millimeter wave transmission device or a joint reception facility can be mentioned. In the millimeter wave transmission apparatus, as a process before frequency conversion to the millimeter wave band, a method of using the UHF band received signal by rearranging the channel arrangement by the apparatus 1 is assumed. In the millimeter wave band, the bandwidth for transmitting the transmission signal is sufficiently secured, but it is often difficult to increase the output of the amplifier circuit that amplifies the millimeter wave band signal. By using the channel arrangement set by the apparatus 1, multi-channel transmission of millimeter wave transmission signals is possible, and the cost of transmission equipment can be greatly reduced.

  The processing of each component of the channel frequency interval setting transmission device 1 can be regarded as a channel frequency interval setting transmission program described in a general-purpose or special computer language. In this case, the same effect as the channel frequency interval setting transmission apparatus 1 can be obtained.

It is a block diagram of a channel frequency interval setting transmission apparatus according to an embodiment of the present invention. It is the figure which showed the 1st example of channel allocation (channel arrangement | sequence). It is the figure which showed the 2nd example of channel allocation (channel arrangement | sequence). It is the figure which showed the 3rd example of channel allocation (channel arrangement | sequence). It is the figure explaining the comparison with a channel frequency space | interval setting transmission apparatus and the conventional transmission equipment. 2 is a flowchart for explaining the operation of the channel frequency interval setting transmission apparatus shown in FIG. (A) (b) is explanatory drawing explaining how to set the channel arrangement of the first example of channel assignment and the second example of channel assignment shown in FIG. 2 and FIG. Both (a) and (b) show how to set the channel arrangement of the first example of channel assignment and the second example of channel assignment shown in FIGS. 2 and 3 (calculation and set on the larger channel number side). It is explanatory drawing demonstrated. Both (a) and (b) show how to set the channel arrangement of the first example of channel assignment and the second example of channel assignment shown in FIGS. 2 and 3 (calculation and set on the smaller channel number side). It is explanatory drawing demonstrated. (A) (b) is explanatory drawing explaining the method of setting the channel arrangement | sequence of the 3rd example of the channel allocation shown in FIG. (A) (b) is explanatory drawing explaining how to set the channel arrangement of the third example of the channel assignment shown in FIG. 4 (calculation and set on the larger channel number side). (A) (b) is explanatory drawing explaining how to set the channel arrangement of the third example of channel assignment shown in FIG. 4 (calculation and set on the smaller channel number side).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Channel frequency interval setting transmission apparatus 3 Channel setting information storage means 5 Reception signal distribution means 7 Frequency conversion means 9 Transmission signal mixing means

Claims (4)

A channel frequency interval setting transmission device for transmitting a plurality of received signals as a plurality of transmission signals to a broadcast / communication transmission path to which channels or frequencies are assigned,
Information on a reception channel of an extracted reception signal extracted from a plurality of the reception signals and a transmission channel of a transmission signal to be transmitted by converting the frequency of the extraction reception signal, and the arbitrary two signals in the transmission signal Channel setting information storage means for storing channel setting information in which the transmission signal is set, so that channel intervals that are channel intervals or frequency intervals that are the frequency intervals are all different.
Received signal distribution means for distributing the received signal to a preset number;
The reception signal distributed by the reception signal distribution means is extracted according to the reception channel included in the channel setting information, and the extracted extracted reception signal is frequency-converted and output according to the transmission channel included in the channel setting information. Frequency conversion means;
Transmission signal mixing means for mixing and outputting the transmission signal whose frequency is converted by the frequency conversion means,
A channel frequency interval setting transmission apparatus comprising: An apparatus for transmitting a plurality of received signals as a plurality of transmission signals to a broadcasting / communication transmission path to which channels or frequencies are assigned,
Received signal distribution means for distributing the received signal to a preset number;
Information relating to the reception channel of the extracted reception signal that is extracted from the plurality of reception signals and the transmission channel of the transmission signal that is transmitted by converting the frequency of the extracted reception signal. A reception channel included in the channel setting information in which the transmission signal is set so that the channel interval which is the interval between the channels of any two signals in the transmission signal or the frequency interval which is the frequency interval is all different A frequency conversion means for extracting the extracted reception signal according to the transmission channel according to the transmission channel included in the channel setting information,
Transmission signal mixing means for mixing and outputting the transmission signal whose frequency is converted by this frequency conversion means,
A channel frequency interval setting transmission program characterized by functioning as: A channel that generates channel setting information for setting a channel or frequency of the transmission signal when transmitting the plurality of received signals as a plurality of transmission signals to a broadcast / communication transmission path to which the channel or frequency is assigned. A configuration information generation method,
From both sides of the maximum and minimum values of the preset channel or frequency, the channel interval or frequency interval of any two transmission signals that have already been set does not become the same as the channel or frequency candidate of the transmission signal. A channel frequency calculation step for calculating the minimum value among the ones;
The channel frequency for setting the channel interval or the frequency interval value from the minimum value side of the channel or frequency or the maximum value side of the channel or frequency based on the minimum value calculated in the channel frequency calculation step. Configuration steps;
A channel setting information generation method comprising: In the channel frequency setting step, any two transmission signal channels that have already been set as candidates for the channel interval or frequency interval of the transmission signal from both sides of the preset channel or the maximum value and the minimum value of the frequency. When calculating the minimum value that does not equal the interval or frequency interval,
The channel interval or frequency interval value set in the subchannel on the minimum value side of the channel or frequency, and the channel interval or frequency interval value set on the subchannel on the maximum value side of the channel or frequency. 4. The channel setting information generation method according to claim 3, wherein the setting is made such that the subchannels are interchangeable.

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