KR20010008154A - Traffic broadcasting system using satellite broadcasting - Google Patents

Abstract

PURPOSE: A traffic broadcasting system using a satellite broadcasting is provided to selectively hear a plurality of channel broadcastings regardless of a circumference environment by using a satellite broadcasting through a suspension orbit satellite. CONSTITUTION: A transmitting apparatus(10) loads broadcasting signals provided on a plurality of sound source on an X-band carrier frequency and transmits it to the outside. A satellite(20) converts the X-band carrier frequency received from the transmitting apparatus(10) into an L-band carrier frequency and transmits it to the ground. A receiving apparatus(30) demodulates the broadcasting signal of each channel from the L-band carrier frequency. An A/D converter(14) converts the received broadcasting signal into a digital broadcasting signal. A compressor(13) compresses the digital broadcasting signal by a predetermined method(MPEG-2). A modulator(12) modulates the compressed broadcasting signal to the X-band carrier frequency. A radio transmitting unit(11) amplifies the X-band carrier frequency and transmits the amplified X-band carrier frequency to the air. The satellite(20) includes an X-band receiving unit(22) for receiving the X-band carrier frequency transmitted from the transmitting apparatus through an X-band antenna(21), a demodulator(23) for demodulating the broadcasting signal from the received X-band carrier frequency, a modulator(24) for modulating the demodulated broadcasting signal to the L-band carrier frequency, and an amplifying and radio transmitting unit(25) for amplifying the modulated L-band carrier frequency by predetermined level and transmitting it to the air through the L-band antenna(26).

Description

Traffic broadcasting system using satellite broadcasting}

The present invention relates to a traffic broadcasting system using satellite broadcasting. More particularly, the present invention relates to a stationary orbit satellite, that is, a traffic, music, and sports broadcast using satellite broadcasting. The present invention relates to a traffic broadcasting system using satellite broadcasting to selectively listen to broadcasts of various channels regardless of the environment.

Generally, broadcasting of music, sports, traffic, etc. currently being used is carried out by AM or FM using terrestrial waves, but as the radio wave reachs far, there is an area that cannot be received due to mixing of noise or attenuation of radio waves. . Local broadcasts in Korea are hard to hear because of the strength of the radio waves reached when the radius is more than 100Km away from the broadcasting relay tower, or noise is generated due to similar radio disturbances in nearby areas.

In addition, it is not possible to listen to radio waves because it is difficult to receive radio waves from terrestrial broadcasting stations, relay stations, or remote areas or mountain areas. Of course, you can consider broadcasting of music, sports, and traffic using Mugunghwa satellite in Korea, but Mugunghwa satellite, a broadcasting communication satellite using Ku-band, should have a receiving antenna with a diameter of about 60cm. In addition, the receiver antenna is equipped with a satellite tracking device that can adjust the antenna direction to direct the satellite, thereby increasing the price of the receiving equipment.

In addition, since the receiving equipment is large and expensive, it may cause physical characteristics and price burden that are difficult to attach to the vehicle.

The present invention converts the broadcasting of various channels such as music, sports, traffic, etc. received through the X-band from the satellite to the L-band (L-band) and transmits it to the ground, so that the driver or another region having a single listening right nationwide. A listener who listens to a broadcast of a specific channel has a purpose to provide a traffic broadcasting system using satellite broadcasting that enables a specific broadcast to be listened to anywhere in the country with a fixed frequency channel without changing the frequency channel of the broadcast.

Also, unlike the terrestrial broadcast, the present invention can provide a high quality broadcast without noise due to noise or other attenuation due to neighboring broadcast frequencies by transmitting a broadcast having a certain radio wave strength to a listener regardless of distance or obstacle. The purpose is to provide a traffic broadcasting system using satellite broadcasting.

In particular, the present invention provides a traffic broadcasting system using satellite broadcasting to digitally digitize the broadcast frequencies of several channels transmitted and received through a satellite, and to compress or expand each of them on the ground to provide a clear broadcast free to the listeners. The purpose is.

1 is a block diagram showing a traffic broadcasting system using satellite broadcasting according to the present invention.

FIG. 2 is a diagram illustrating a specific configuration of the satellite body in FIG. 1.

※ Explanation of code about main part of drawing ※

10: transmission equipment 11: wireless transmission unit

12, 24 modulator 13 compression unit

14: A / D conversion unit 15: X-band transmitting antenna

20: satellite 21: antenna for receiving X-band

22: X-band receiver 23,33: demodulator

25: amplification and wireless transmitter 26: L-band transmitting antenna

30: reception equipment 31: L-band receiving antenna

32: wireless receiving unit 34: restoring unit

35: signal processor 36: speaker

In the traffic broadcasting system using satellite broadcasting according to the present invention for achieving the above object, the X-band (7025MHz ~ ~) after compressing the broadcast signal of several channels installed on the ground and supplied from a plurality of sound sources in a digital state A transmitter for radio transmission on a carrier frequency of 7075 MHz and an X-band carrier frequency carrying the broadcast signals of the various channels are received, and then converted to a carrier frequency of L-band (1452 MHz to 1492 MHz) to the ground. And a receiving device which demodulates the broadcast signal of each channel from the carrier frequency of the L-band received from the satellite and expands it to output the output means.

The transmission equipment includes A / D conversion means for converting a broadcast signal input from various sound sources such as a microphone, a TV, an electric recorder, a PC, etc. into a digital state, and a broadcast signal supplied from the A / D conversion means (MPEG-). 2) compression means for compressing the signal, modulating means for modulating the compressed broadcast signal to a carrier frequency of X-bands (7025MHz to 7075MHz), and amplifying the carrier frequency of the X-band in which the broadcast signal is carried to a predetermined level and waiting. It is preferable to include the wireless transmission means for transmitting in the middle.

In addition, the satellite is an X-band receiving means for receiving a carrier frequency of the X-band (7025MHz ~ 7075MHz) transmitted from the terrestrial transmitting equipment through the X-band antenna, and the carrier received by the X-band receiving means Demodulation means for demodulating a broadcast signal from a frequency; modulating means for remodulating the demodulated broadcast signal to a carrier frequency of L-bands (1452 MHz to 1492 MHz); and amplifying the carrier frequency of the modulated L-band to a predetermined level. It is preferable to include an amplification and wireless transmission means for transmitting radio to the ground through the L-band antenna.

And the receiving device is a radio receiving means for receiving the carrier frequency of the L-band (1452MHz ~ 1492MHz) radio transmission from the satellite through the L-band antenna, and a plurality of channels from the carrier frequency received by the radio receiving means Demodulation means for demodulating the broadcast signal of the apparatus, restoring means for expanding and restoring the demodulated broadcast signal to its original state, and signal processing means for D / A converting and amplifying the restored broadcast signal and outputting the same to a speaker. desirable.

As the above L-band receiving antenna, a microstrip antenna may be used. Here, since the beam width of the L-band wirelessly transmitted by the satellite according to the present invention is about 80 times larger than the beam width transmitted by the light for satellite reception, the satellite is wirelessly transmitted from the satellite by a microstrip antenna, which is a small antenna having a diameter of about 10 cm. In addition to being able to receive even when receiving the carrier frequency of the L-band is characterized in that it is easy to be mounted in a vehicle or other predetermined space because it is small. In particular, when mounted on a moving vehicle, a plurality of microstrip-type antennas are arranged so as to face the north, south, east, west and north to receive the carrier frequency of the L-band wirelessly transmitted from the satellite regardless of the movement of the vehicle.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 is a block diagram showing a traffic broadcasting system using satellite broadcasting according to the present invention, Figure 2 is a block diagram showing a specific configuration of the satellite body in FIG.

Referring to Figure 1, the traffic broadcasting system using the satellite broadcasting according to the present invention, the transmission equipment 10 for transmitting radio waves to the satellite body from the ground and the satellite body 20 mounted on the satellite in the geostationary orbit so that the mobile reception is possible. It consists of a receiving device 30 and the like. The system according to the present invention can be applied not only to traffic broadcasting but also to music and sports relay.

In more detail, as shown in FIG. 1, the transmission apparatus 10 includes an A / D converter 14 for converting a broadcast signal input from various sound sources such as a microphone, a TV, an all-axis, a PC, etc. into a digital state, and the above A. The compression unit 13 which compresses (approximately, about 900 to 1100 times) the broadcast signal supplied from the / D converter 14 in a predetermined manner (MPEG-2), and the X-band ( A modulator 12 for modulating at a carrier frequency of 7025 MHz to 7075 MHz, and a wireless transmitter 11 for amplifying the carrier frequency of the X-band carrying a broadcast signal to a predetermined level and transmitting it to the air through the antenna 15. It is.

The satellite 20 mounted on the satellite in the orbit has a carrier frequency of the X-band (7025 MHz to 7075 MHz) transmitted from the terrestrial transmission equipment 10 as shown in FIG. 2. An X-band receiver 22 for receiving a signal, a demodulator 23 for demodulating a broadcast signal from a carrier frequency received by the X-band receiver 22, and an L-band (1452 MHz to A modulator 24 for re-modulation at a carrier frequency of 1492 MHz and an amplification and wireless transmitter for amplifying the carrier frequency of the modulated L-band to a predetermined level and wirelessly transmitting it to the ground through the L-band antenna 26. 25).

Lastly, the reception device 30 mounted on a vehicle or provided to be conveniently carried by a user has an L-band carrier frequency of an L-band (1452 MHz to 1492 MHz) wirelessly transmitted from the satellite body 20 as shown in FIG. 1. A radio receiver 32 for receiving via the antenna 31, a demodulator 33 for demodulating broadcast signals of various channels from a carrier frequency received by the radio receiver 32, and demodulated broadcast signals And a signal processor 35 for performing D / A conversion and amplification of the broadcast signals of various channels, and outputting them to the speaker 36.

In particular, the L-band reception antenna 31 mounted on a vehicle or the like and connected to the wireless receiver 32 uses a microstrip antenna to transmit the position of the vehicle, that is, the antenna mounted on the vehicle, even if the antenna mounted on the vehicle does not face the satellite. It will be able to smoothly receive broadcast signals of various channels.

Here, since the beam width of the L-band wirelessly transmitted by the satellite according to the present invention is about 80 times larger than the beam width transmitted by the light for satellite reception, the satellite is wirelessly transmitted from the satellite by a microstrip antenna, which is a small antenna having a diameter of about 10 cm. In addition to being able to receive even when receiving the carrier frequency of the L-band is characterized in that it is easy to be mounted in a vehicle or other predetermined space because it is small. In particular, when mounted on a moving vehicle, a plurality of microstrip-type antennas are arranged so as to face the north, south, east, west and north to receive the carrier frequency of the L-band wirelessly transmitted from the satellite regardless of the movement of the vehicle.

The operation of the present invention configured as described above will be described.

First, when various voices for music, sports, and traffic broadcasting are input from a sound source such as a microphone, a TV, an electric recorder, a PC, or the like, the A / D converter 14 converts the voice into digital, and the compressor 13 To feed.

When the voice is input in this way, the compression unit 13 storing an algorithm such as MPEG-2 for compressing the voice or the image is compressed to 900 to 1100 times and provided to the modulator 12. The compressed voice is then modulated by the modulator 12 into a broadcast signal for wireless transmission by the carrier frequency of the X-band, which is a micro band, and then the wireless transmitter 11 and the X-band transmitting antenna 15 are modulated. Air is transmitted to the satellite 20 in the air. Here, since the frequency bandwidth of the broadcast signal is typically about 27 KHz, the broadcast signal corresponding to 100 or more channels may be wirelessly transmitted and processed simultaneously when using the broadcast satellite. Of course, broadcast signals for more than 100 channels are preferably processed by time division modulation (TDM) and transmitted.

In addition, since the X-band transmitting antenna 15 on the ground does not need to be moved or mounted, it does not have a large obstacle in size or volume, and thus the diameter of the X-band transmitting antenna 15 can be stably reached to the satellite 20. It is preferable to use a 3.7 m or more and a transmission output of 60 W or more.

Then, the X-band receiving unit 22 of the satellite body 20 receives the carrier frequency of the X-band wirelessly transmitted from the terrestrial transmitting device 10 via the X-band receiving antenna 21. In particular, since the satellite on which the satellite body 20 is mounted is in a stationary orbit, the satellite body 20 may not transmit the direction of the X-band transmitting antenna 15 of the transmitting device 10 on the ground from time to time. All broadcast signals transmitted by 10) can be received.

The carrier frequency of the X-band received by the X-band receiver 22 via the X-band receiver antenna 21 is demodulated by the demodulator 23 and then the carrier frequency of the L-band in the modulator 24. Is modulated again by the amplification and provided to the amplification and wireless transmitter 25. Then, the carrier frequency of the L-band is amplified to a predetermined level suitable for reception on the ground by the amplification and radio transmitter 25 and is transmitted to the ground.

Here, the reason for converting the carrier frequency is that when the signal from the ground is stronger, there is an advantage that the receiving antenna and the equipment of the satellite can be reduced, which is compared to the cost caused by the large equipment in the satellite, the transmission equipment and antenna on the ground The cost is very low and economical.

When the carrier frequency of the L-band transmitted from the satellite body 20 is received by the wireless receiving unit 32 through the L-band receiving antenna 31 of the receiving device 30 installed on the vehicle or on the ground, the demodulator 33 Demodulates the voice for broadcast from the carrier frequency of the L-band. The voice is then restored to the state before the first compression by the restorer 34.

Since the voice extended from the ground is D / A converted and amplified by the signal processor 35 and output through the speaker 36, the listener can listen to a specific broadcast even when the surrounding environment such as a vehicle movement or a mountainous region changes. In order to listen without changing the frequency channel.

Of course, the present invention is not limited to the voice, it will be obvious that the image and various information can be provided to the viewers or customers in the same way.

Therefore, according to the present invention, the present invention converts the broadcasting of various channels such as music, sports, traffic, etc. received in the X-band from the satellite to the L-band and transmits it to the ground, so that the driver or another region having a single listening right nationwide. The listener who listens to a broadcast of a specific channel has the effect of listening to a specific broadcast anywhere in the country with a fixed frequency channel once without changing the frequency channel of the broadcast.

Also, unlike the terrestrial broadcast, the present invention can provide a high quality broadcast without noise due to noise or other attenuation due to neighboring broadcast frequencies by transmitting a broadcast having a certain radio wave strength to a listener regardless of distance or obstacle. It is.

In particular, the present invention can provide a listener free of noise by digitizing the broadcast frequency of several channels transmitted and received via satellite, and compressing or reconstructing each of them on the ground.

Although the present invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the present invention, and such modifications and modifications belong to the appended claims.

Claims (5)

A transmission device which is installed on the ground and compresses broadcast signals of various channels supplied from a plurality of sound sources into a digital state and then wirelessly transmits them on a carrier frequency of an X-band (7025MHz to 7075MHz); A satellite body receiving an X-band carrier frequency carrying the broadcast signals of the various channels and converting the carrier frequency into an L-band carrier (1452 MHz to 1492 MHz) for wireless transmission to the ground; And A reception device for demodulating the broadcast signal of each channel from the carrier frequency of the L-band received from the satellite and expanding the broadcast signal to output means; Traffic broadcasting system using a satellite broadcast, comprising a. The method of claim 1, The transmission equipment may include an A / D conversion unit for converting a broadcast signal input from various sound sources such as a microphone, a TV, an electric recorder, a PC, and the like into a digital state, and a broadcast signal supplied from the A / D conversion unit (MPEG). A compression unit for compressing the compressed broadcast signal to a carrier frequency of X-band (7025MHz to 7075MHz), and amplifying the carrier frequency of the X-band carrying the broadcast signal to a predetermined level. Traffic broadcasting system using the satellite broadcasting, characterized in that it comprises a wireless transmission unit for transmitting to the air. The method of claim 1, The satellite body is an X-band receiving unit for receiving the carrier frequency of the X-band (7025MHz ~ 7075MHz) transmitted from the terrestrial transmission equipment through the X-band antenna, and from the carrier frequency received by the X-band receiver A demodulator for demodulating a broadcast signal, a modulator for remodulating the demodulated broadcast signal to a carrier frequency of L-bands (1452MHz to 1492MHz), and amplifying the carrier frequency of the modulated L-band to a predetermined level to obtain L- Traffic broadcasting system using the satellite broadcasting, characterized in that it comprises an amplification and wireless transmission unit for transmitting the radio to the ground through the band antenna. The method of claim 1, The reception apparatus includes a radio receiver for receiving carrier frequencies of L-bands (1452 MHz to 1492 MHz) wirelessly transmitted from the satellite through an L-band antenna, and broadcasting of various channels from the carrier frequencies received by the radio receiver. And demodulating the signal, a reconstructing unit for expanding and restoring the demodulated broadcast signal to its original state, and a signal processing unit for D / A converting and amplifying the restored broadcast signal and outputting the same to a speaker. Traffic broadcasting system using the satellite broadcasting. The method according to claim 1 or 4, The L-band receiving antenna is a micro-strip antenna, characterized in that the traffic broadcasting system using the satellite broadcasting.