JP-7856152-B2 - Digital broadcasting receiving device and digital broadcasting receiving method

JP7856152B2JP 7856152 B2JP7856152 B2JP 7856152B2JP-7856152-B2

Inventors

松村喜修

Assignees

株式会社ソシオネクスト

Dates

Publication Date: 20260511
Application Date: 20220726

Claims (20)

A digital broadcasting receiver that receives digital broadcasts using the OFDM (Orthogonal Frequency Division Multiplexing) system, The physical channels of the aforementioned digital broadcast have a partial receiving bandwidth which is part of the receiving bandwidth. The aforementioned digital broadcast receiving device is It comprises a plurality of demodulation units that perform demodulation processing, and a combining unit that combines the outputs of the plurality of demodulation units, In the first operating mode, The multiple demodulation units output multiple demodulated signals by processing the signals of the partial receiving band of the same physical channel. The combining unit performs processing on the partial receiving band based on the multiple demodulated signals output from the multiple demodulation units. In a second operating mode different from the first operating mode, One of the multiple demodulation units outputs a single demodulated signal by processing the signal of the entire reception band, including the partial reception band. The combining unit performs processing on the entire reception band based on the one demodulated signal output from the one demodulation unit.
The plurality of demodulation units include a first demodulation unit, a second demodulation unit, a third demodulation unit, and a fourth demodulation unit. The digital broadcasting receiving device according to claim 1, wherein the one demodulation unit is the first demodulation unit.
In the first operating mode described above, The first demodulation unit performs processing using the first memory area corresponding to the first demodulation unit. The second demodulation unit performs processing using the second memory area corresponding to the second demodulation unit. The third demodulation unit performs processing using the third memory area corresponding to the third demodulation unit. The fourth demodulation unit performs processing using the fourth memory area corresponding to the fourth demodulation unit. In the second operating mode described above, The digital broadcasting receiving device according to claim 2, wherein the first demodulation unit uses the first storage area and processes data using at least a portion of the second storage area, the third storage area, and the fourth storage area.
The signal of the partial reception band processed in the first operating mode is a signal based on the digital broadcast input from a plurality of antennas that correspond one-to-one with the plurality of demodulation units. The digital broadcast receiving device according to any one of claims 1 to 3, wherein the signal of the entire reception band processed in the second operating mode is a signal based on the digital broadcast input from one antenna corresponding to one demodulation unit.
Each of the aforementioned multiple demodulators is: A time-axis processing unit that processes the time-axis of the broadcast wave of the aforementioned digital broadcast, The FFT processing unit is connected to the output side of the time axis processing unit, A subcarrier synchronization unit connected to the output side of the FFT processing unit, A transmission path estimation unit connected to the output side of the subcarrier synchronization unit, It has, In the first operating mode described above, Each of the aforementioned multiple demodulation units outputs the multiple demodulated signals using its respective time-axis processing unit, FFT processing unit, subcarrier synchronization unit, and transmission path estimation unit. In the second operating mode described above, The digital broadcasting receiving device according to any one of claims 1 to 3, wherein the demodulation unit outputs the demodulated signal using the time axis processing unit, the FFT processing unit, the subcarrier synchronization unit, and the transmission path estimation unit of the demodulation unit.
The aforementioned demodulation unit has a pre-synthesis unit different from the synthesis unit, The pre-combination unit generates a combined signal by combining the signal being processed in one demodulation unit with the signal being processed in another demodulation unit different from the one described above. In the second operating mode described above, The digital broadcasting receiving device according to claim 5, wherein the demodulation unit processes the synthesized signal generated by the pre-synthesis unit.
The digital broadcast receiving apparatus according to claim 6, wherein the signal being processed in one demodulation unit and the signal being processed in the other demodulation unit are the same signal as the signal input to the time axis processing unit or the signal input to the FFT processing unit.
The aforementioned demodulation unit further includes a selection unit to which both the signal being processed in the demodulation unit and the combined signal generated in the pre-combination unit are input. In the first operating mode described above, The selection unit selects the signal being processed by the demodulation unit, The aforementioned demodulation unit continues to process the signal being processed by the demodulation unit, In the second operating mode described above, The selection unit selects the composite signal, The digital broadcast receiving device according to claim 6, wherein the demodulation unit performs processing on the composite signal.
The aforementioned digital broadcasting transmission method includes parameters related to the FFT size, In the second operating mode described above, if the FFT size corresponds to 32k, The digital broadcasting receiving device according to claim 2 or 3, wherein the combining unit performs processing on the entire receiving band based only on the one demodulated signal output from the one demodulation unit.
The aforementioned digital broadcasting transmission method includes parameters related to the FFT size, In the second operating mode described above, if the FFT size corresponds to 16k, The digital broadcasting receiving apparatus according to claim 2 or 3, wherein the combining unit performs processing on the entire receiving band based on the one demodulated signal output from the first demodulation unit and the demodulated signal output from any one of the second demodulation unit, the third demodulation unit and the fourth demodulation unit.
The aforementioned digital broadcasting transmission method includes parameters related to the FFT size, In the second operating mode described above, if the FFT size is 8k compatible, The digital broadcasting receiving apparatus according to claim 2 or 3, wherein the combining unit performs processing on the entire receiving band based on the one demodulated signal output from the first demodulation unit and the demodulated signals output from the second demodulation unit, the third demodulation unit, and the fourth demodulation unit, respectively.
The physical channel is composed of 35 segments with continuous frequency bands. The digital broadcast receiving device according to any one of claims 1 to 3, wherein the aforementioned partial receiving band is the nine segments located in the center of the 35 segments.
A digital broadcasting receiver that receives digital broadcasts using the OFDM (Orthogonal Frequency Division Multiplexing) system, The physical channels of the aforementioned digital broadcast have a partial reception band which is part of the reception band and a non-partial reception band which is different from the partial reception band. The aforementioned digital broadcast receiving device is A first demodulation unit and a second demodulation unit that perform demodulation processing, A combining unit that combines the output of the first demodulation unit and the output of the second demodulation unit, Equipped with, The aforementioned synthesis section is As processing corresponding to the signal in the aforementioned partial receiving band, processing is performed based on the demodulated signal output from the first demodulation unit and the demodulated signal output from the second demodulation unit. A digital broadcast receiving device that performs processing based solely on the demodulated signal output from the first demodulation unit, as a processing method for signals in the non-partial reception band.
The first demodulation unit has a pre-synthesis unit different from the synthesis unit, The pre-combination unit combines the signal being processed in the first demodulation unit and the signal being processed in the second demodulation unit to generate a combined signal. The digital broadcasting receiving device according to claim 13, wherein the first demodulation unit processes the synthesized signal generated by the pre-synthesis unit.
Each of the first demodulation unit and the second demodulation unit is: A time-axis processing unit that processes the time-axis of the broadcast wave of the aforementioned digital broadcast, The FFT processing unit is connected to the output side of the time axis processing unit, A subcarrier synchronization unit connected to the output side of the FFT processing unit, A transmission path estimation unit connected to the output side of the subcarrier synchronization unit, It has, The digital broadcast receiving device according to claim 14, wherein the signal being processed in the first demodulation unit and the signal being processed in the second demodulation unit are the same signals as the signal input to the time axis processing unit or the signal input to the FFT processing unit.
The aforementioned digital broadcasting transmission method includes parameters related to the FFT size, The aforementioned synthesis section is The system has a first processing mode performed when the FFT size is 32k compatible, and a second processing mode performed when the FFT size is 16k compatible or 8k compatible. In the first processing mode, as processing for signals in the partial reception band, processing is performed based on the demodulated signal output from the first demodulator and the demodulated signal output from the second demodulator, and as processing for signals in the non-partial reception band, processing is performed based only on the demodulated signal output from the first demodulator. The digital broadcast receiving device according to any one of claims 13 to 15, wherein in the second processing mode, processing is performed with respect to both the signal in the partial reception band and the signal in the non-partial reception band based on both the first demodulation unit and the second demodulation unit.
The physical channel is composed of 35 segments with continuous frequency bands. The aforementioned partial receiving band consists of nine segments located in the center of the 35 segments. The digital broadcasting receiving device according to any one of claims 13 to 15, wherein the non-partial receiving band is 26 segments excluding the partial receiving band.
A digital broadcasting reception method for receiving digital broadcasts using the OFDM (Orthogonal Frequency Division Multiplexing) system, The physical channels of the aforementioned digital broadcast have a partial receiving bandwidth which is part of the receiving bandwidth. In the digital broadcasting reception method described above, processing by a first operating mode and processing by a second operating mode different from the first operating mode are performed selectively. In the processing according to the first operating mode described above, Multiple demodulation units process the signals of the partial receiving band of the same physical channel to output multiple demodulated signals, and a combining unit performs processing on the partial receiving band based on the multiple demodulated signals. In the processing according to the second operating mode described above, A digital broadcasting reception method comprising: one of the plurality of demodulation units processes the signals of the entire reception band, including the partial reception band, in order to output a single demodulated signal; and the combining unit performs processing on the entire reception band based on the single demodulated signal.
A digital broadcasting reception method for receiving digital broadcasts using the OFDM (Orthogonal Frequency Division Multiplexing) system, The physical channels of the aforementioned digital broadcast have a partial reception band which is part of the reception band and a non-partial reception band which is different from the partial reception band. In the aforementioned digital broadcasting reception method, As processing corresponding to the signal in the aforementioned partial receiving band, a synthesis process is performed based on the demodulated signal output from the first demodulation unit and the demodulated signal output from the second demodulation unit. A digital broadcasting reception method that performs processing based only on the demodulated signal output from the first demodulation unit, as processing for signals in the non-partial reception band.
A digital broadcasting receiver that receives digital broadcasts using the OFDM (Orthogonal Frequency Division Multiplexing) system, The aforementioned digital broadcasting transmission method has a frame structure, where one frame consists of multiple subframes, and each of the multiple subframes includes parameters related to the FFT size. The digital broadcast receiving device comprises a plurality of demodulation units that perform demodulation processing, and a combining unit that combines the outputs of the plurality of demodulation units. The first demodulator, which is one of the plurality of demodulators, processes the digital broadcast signal to output a single demodulated signal. The combining unit performs processing on the digital broadcast signal based on at least one demodulated signal output from the first demodulation unit. If the FFT size in one of the aforementioned subframes corresponds to 32k, The combining unit processes the digital broadcast signal based solely on the single demodulated signal output from the single demodulated unit. If the FFT size in one of the aforementioned subframes corresponds to 16k or 8k, The combining unit performs processing on the digital broadcast signal based on at least two or more demodulated signals output from the plurality of demodulation units. Digital broadcasting receiving device.

Description

This disclosure relates to a digital broadcasting receiving device and a digital broadcasting receiving method. Currently, the practical application of next-generation digital broadcasting systems is being considered. It is expected that the next-generation system will employ the same OFDM (Orthogonal Frequency Division Multiplexing) transmission method as the current system (ISDB-T: Integrated Services Digital Broadcasting-Terrestrial). On the other hand, as a receiving device for vehicles, a technology is known that uses diversity reception to receive digital broadcasts in order to ensure the quality of the received signal. As an example of this type of receiving device, Patent Document 1 discloses a vehicle-mounted receiving device that receives digital broadcasts using diversity reception. In this receiving device, the same channel is selected and demodulated in each of the four receiving branches, and the four demodulated signals are combined as carriers to generate viewing data. Japanese Patent Publication No. 2016-149651 Figure 1 is a schematic diagram illustrating the physical channel structure of digital broadcasting in the current and next-generation systems.Figure 2 shows the configuration of a digital broadcast receiving device according to Embodiment 1.Figure 3 shows the configuration of the demodulation unit of the digital broadcast receiving device according to Embodiment 1.Figure 4A is a diagram showing the first operating mode of the digital broadcast receiving device according to Embodiment 1.Figure 4B is a diagram showing the second operating mode of the digital broadcast receiving device according to Embodiment 1.Figure 4C shows the operating mode when receiving current digital broadcasts using the digital broadcasting receiving device according to Embodiment 1.Figure 5 is a flowchart showing the digital broadcasting reception method according to Embodiment 1.Figure 6 shows the configuration of a digital broadcast receiving device according to a modified example 1 of Embodiment 1.Figure 7A is a diagram showing the first operating mode of a digital broadcast receiving device according to a modified example 1 of Embodiment 1.Figure 7B shows a second operating mode of a digital broadcast receiving device according to a modified example 1 of Embodiment 1.Figure 8A shows a second operating mode when the FFT size of the physical channel processed by the digital broadcast receiving device according to the modified example 2 of Embodiment 1 is 32k.Figure 8B shows a second operating mode when the FFT size of the physical channel processed by the digital broadcast receiving device according to the modified example 2 of Embodiment 1 is 16k.Figure 8C shows a second operating mode when the FFT size of the physical channel processed by the digital broadcast receiving device according to the modified example 2 of Embodiment 1 is 8k.Figure 9 shows the configuration of a digital broadcast receiving device according to Embodiment 2.Figure 10A is a diagram showing the operation of the digital broadcasting receiving device according to Embodiment 2.Figure 10B shows the operating mode when receiving current digital broadcasts using the digital broadcasting receiving device according to Embodiment 2.Figure 11 is a flowchart showing a digital broadcasting reception method according to Embodiment 2.Figure 12 shows the configuration of a digital broadcasting receiving device according to a modified example 1 of Embodiment 2.Figure 13 is a diagram showing the operation of a digital broadcast receiving device according to a modified example 1 of Embodiment 2.Figure 14A shows the operation when the FFT size of the physical channel processed by the digital broadcast receiving device according to the modified example 2 of Embodiment 2 is 32k.Figure 14B shows the operation when the FFT size of the physical channel processed by the digital broadcast receiving device according to the modified example 2 of Embodiment 2 is 16k.Figure 14C shows the operation when the FFT size of the physical channel processed by the digital broadcast receiving device according to the modified example 2 of Embodiment 2 is 8k.Figure 15 is a diagram showing the configuration of a digital broadcast receiving device according to Embodiment 3.Figure 16A is a diagram showing the first operating mode of the digital broadcast receiving device according to Embodiment 3.Figure 16B is a diagram showing the second operating mode of the digital broadcast receiving device according to Embodiment 3.Figure 16C is a diagram showing the operating mode when receiving current digital broadcasts using the digital broadcasting receiving device according to Embodiment 3.Figure 17A shows a second operating mode when the FFT size of the physical channel processed by the digital broadcast receiving device according to the modification 1 of Embodiment 3 is 32k.Figure 17B shows a second operating mode when the FFT size of the physical channel processed by the digital