JPH11234093A - Satellite broadcasting reception method and apparatus thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transmit a plurality of carriers to one transponder and to increase the repetition of reception→program information discrimination→reselection of station→reception in the case of a low bit rate, by which the frequency fluctuation of LNB(low noise block) of a satellite broadcasting receiver is hard and especially the carrier band of an SCPC(signal channel per carrier) system is narrow. SOLUTION: A CPU part 7 supplies a TS packet corresponding to a second intermediate frequency 2ndIF, which is band-restricted by a filter part 4 and demodulated by an IQ demodulation part 9 to a forward error correction (QPSK /FEC) part 10 and an (SCR) (screamble)/DEMUX(demultiplexer) part 11 prior to the selection of a carrier. Frequency carriers are scanned in order starting from the lowest one by PID of the TS packet. Program information corresponding to the carrier of the packet is obtained every time and is accumulated in a memory 8. Then, the CPU part 7 discriminate whether the carrier selected by a station selection part 3 is to be selected or not. When the carrier which is to be selected is mistaken, program information stored in the memory 8 is referred to and the station is speedily selected again.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite broadcast receiving method and apparatus, and more particularly, to an SCPC (Single PCC).
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite broadcast receiving method and apparatus corresponding to a Channel Per Carrier method.

[0002]

2. Description of the Related Art In satellite broadcasting distribution, it is an object of a satellite broadcasting receiver corresponding to the SCPC system as a transmission system of a radio wave from a satellite to automatically select a carrier.

[0003] The SCPC system is a system for transmitting a plurality of carriers within a band of one transponder from a satellite, and in reception, a carrier to be selected is controlled by a PLL system in a tuning unit.

However, the radio wave captured by the antenna is an LNB (Low Noise Block Conv.)
ertor) converts a signal in the 12 GHz band into a signal in the 1 GHz band and inputs the signal to the receiver.
Since the local oscillator has a variation of Δf1, the receiver has a function of following the variation.

In the case of satellite digital broadcasting, since information such as a channel, a frequency, and a program content is transmitted as data as program information, another carrier is erroneously selected from a carrier to be selected. Even in this case, it has a function of judging an error by judging channel information and performing channel reselection. The re-selection is performed by a method of individually setting the reception frequency and a method of performing the scan selection.

[0006]

However, in the prior art, if the frequency fluctuation Δf1 of the LNB fluctuates greatly, reception → program information discrimination → reselection → reception → is repeated each time. Depending on the amount of information, information acquisition determination in broadcasting is required in units of several seconds, and much time is required until normal reception. In particular, S
In the case of transmission at a low bit rate with a narrow carrier band as the CPC method, a large number of carriers are transmitted within one transponder, and the repetition of reception → program information determination → reselection → reception → increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and has been made to solve the above-mentioned problems inherent in the conventional technology. Therefore, an object of the present invention is to obtain program information for all carriers in advance. It is another object of the present invention to provide a new satellite broadcast receiving method and a receiving apparatus thereof, which can perform re-selection more quickly than the acquired information when a carrier to be selected is incorrect.

[0008]

In order to achieve the above object, a satellite broadcast receiving method according to the present invention acquires program information such as channel, frequency and program contents from a satellite broadcast received signal for all carriers in advance. In the case where the carrier to be selected is erroneously selected, re-selection is quickly performed based on the previously acquired information.

A satellite broadcast receiving apparatus according to the present invention stores program information acquiring means for acquiring program information from a satellite broadcast received signal for all carriers in advance, and stores the program information acquired by the program information acquiring means. A storage unit, a determination unit for determining whether the selected carrier among the carriers is a carrier to be selected, and the storage unit if the carrier to be selected is incorrect as a result of the determination by the determination unit. Reselection executing means for quickly performing reselection according to the stored acquired program information.

[0010] The satellite broadcast receiver according to the present invention is an SCPC.
In the system, by retrieving program information by carrier reception in advance for frequency fluctuation factors such as LNB, even if erroneous reception is performed on the carrier to be selected, quick reselection of regular carrier reception is performed. Can be.

[0011]

Next, a preferred embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a diagram for explaining the operation of the embodiment of the present invention.

Referring to FIG. 1, in a receiver for receiving a signal of the SCPC system, a signal in a 12 GHz band from a satellite is captured by antenna 1, and a signal of 1 GHz is captured by LNB 2.
The signal is converted into an Hz band signal (1st IF) and input to the satellite broadcast receiver 14.

The 1 GHz band signal (1st IF) is input to the tuner 3 of the satellite broadcast receiver 14. Tuning section 3 is C
The control of the PU 7 controls the PLL unit 6 to control the oscillation frequency of the second local oscillator 5, tunes the carrier to be selected, and outputs the second IF. 2 output from tuning section 3
The ndIF is band-limited by the filter unit 4 and
The demodulation and error correction are performed by the Q demodulation unit 9 and the QPSK / FEC unit 10, and various information is obtained and the MPEG data is output by the SCR / DEMUX unit 11, and the MPEG data is output.
The video / audio is output by the video / audio processing unit 13 after being decoded by the unit 12.

The tuner 3 amplifies the 1st IF signal,
The second intermediate frequency 2 is mixed with the output of the second local oscillator 5 for channel selection.
ndIF, and a PLL system, that is, a PLL unit 6 is used.

Next, the operation of the embodiment of the present invention shown in FIG. 1 will be described with reference to FIG.

When a signal of one transponder is received, scanning is started from a low frequency carrier in the transponder band, various kinds of program information are acquired every time a carrier is captured, and frequency information and the like are stored in a memory 8. deep.

That is, prior to the selection of the carrier, the CPU section 7 limits the band by the filter section 4 and demodulates the signal by the IQ demodulation section 9 to obtain a QPSK (Quadrature).
Phase Shift Keying) / FEC
(Forward ErrorCorrection)
The TS (transport stream) output from the unit 10 is converted into SCR (Scramble) / DEMUX (De
multiplexor), and sequentially scan carriers according to the identifier PID of the TS packet, and each time, a channel corresponding to the carrier of the packet;
The program information such as frequency and program contents is acquired and stored in the memory 8.
Store and store in.

The band configuration shown in FIG. 2 shows an example in which F2 (F2 <F1) × n carriers (F21, F22, F23... F2n) are transmitted for one transponder band F1. . In this case, assuming that F23 is currently the carrier to be selected, LNB2 in FIG.
Occurs, a carrier exists at the frequency of F23 + Δf1, and under the control of the CPU 7, the PLL
The carrier selecting operation of F23-Δf1 is performed even when the channel selecting control of F23 to be selected by the unit 6 and the second local oscillator 5 is performed.

When F23−Δf1 = F22, F2
By receiving the two carriers, the SCR / DEMUX unit 11 acquires the program information, and the CPU unit 7 can recognize the difference from the original carrier to be selected based on each information of F22, and has already acquired it. Re-selection is performed from the program information of each carrier.

In the tuning operation of F22, the PLL
In the case of the unit 6, when the difference between the set frequency fa and the frequency fb locked by the PLL unit 6 + fc, the CPU 7 recognizes the frequency fc of the difference. In this case, it is possible to perform a channel selection operation at fd + fc, thereby performing a quick carrier selection.

Although the embodiment of the present invention has been described with reference to the SCPC system, there is no limitation on the system, and MCPC (M
multi Channel Per Carrier)
The present invention can be applied and extended to other systems and others.

FIG. 3 is a flowchart showing an example of the operation flow of the present invention.

Referring to FIG. 3, in step S1, scanning is started by the CPU unit 7 sequentially from a low frequency carrier in the transponder carrier band transmitted from one transponder, and each time a carrier is captured in step S2, a channel, The program information such as frequency and program contents is acquired, and the acquired program information is stored in the memory 8.

Next, the CPU section 7 determines whether or not the carrier selected by the tuning section 3 in step S3 is a carrier to be selected. As a result of the determination in step S3, if it is determined that the carrier is a correct carrier to be selected, the process is terminated. If No, that is, if it is determined that there is an error, the CPU unit 7 proceeds to step S4. Then, program information in the memory 8 acquired and stored for all carriers in the memory is searched, and a desired correct carrier is reselected by referring to the program information.

[0026]

The present invention is constructed and operates as described above. According to the present invention, the following effects can be obtained.

The first effect is that each carrier information is acquired in advance, and subsequent carrier reception does not perform channel selection by scanning, but only performs a channel selection operation based on the acquired information.

The second effect is that the tuning error in the locked state is recognized by the PLL control, and the tuning can be performed in consideration of the error frequency at the time of re-selection.

The third effect is that it is possible to quickly select a narrow band signal in the reception of the SCPC system.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment according to the present invention.

FIG. 2 is a diagram illustrating the operation of one embodiment of the present invention.

FIG. 3 is a flowchart illustrating an example of an operation flow of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Antenna 2 ... LNB 3 ... Tuning part 4 ... Filter part 5 ... Second local oscillator part 6 ... PLL part 7 ... CPU part 8 ... Memory 9 ... IQ demodulation part 10 ... QPSK / FEC part 11 ... SCR / DEMUX part 12 ... MPEG section 13 ... Video / audio processing section 14 ... Satellite broadcast receiver F1 ... 1 transponder band F21 ... F2n ... Carrier

Claims (4)

[Claims] 1. Program information such as channel, frequency, and program contents are acquired and stored in advance for all carriers from a satellite broadcast reception signal, and when a carrier to be selected is erroneous, the program information is acquired in advance. A satellite broadcast receiving method, wherein a channel re-selection is executed quickly based on acquired information. 2. The satellite broadcast receiving method according to claim 1, wherein the operation of acquiring the program information for all carriers in advance is performed prior to the selection of the carriers. 3. A program information acquisition means for acquiring program information from all satellite carriers in advance from a satellite broadcast reception signal,
Storage means for storing the program information obtained by the program information obtaining means, and determining means for determining whether the carrier selected among the carriers is a carrier to be selected,
Reselection executing means for performing reselection promptly based on the acquired program information stored in the storage means when a carrier to be selected is incorrect as a result of the determination by the determination means. Receiver. 4. The system according to claim 1, wherein said program information acquiring means inputs a transstream packet based on a received signal.
R / DEMUX means and a CPU for accessing between the SCR / DEMUX means, and a judgment function of the judgment means and a tuning function of the reselection execution means are provided by the CPU.
4. The satellite broadcast receiving apparatus according to claim 3, further comprising: