KR100691173B1 - Satellite Digital Audio Radio Service RECEIVER FOR VEHICLES - Google Patents

Abstract

An object of the present invention is to provide a satellite digital radio broadcasting receiver for a vehicle having a Bluetooth wireless transmission / reception function according to the IEEE 802.15.1 protocol in each of the slave receiver and the master receiver.

A satellite digital radio broadcasting receiver for a vehicle according to the present invention includes a power supply unit including a solar cell; A slave receiver including a SDARS receiver receiving power from the power supply unit, receiving an SDARS signal from an antenna, and a Bluetooth transmission module converting the signal from the SDARS receiver into a Bluetooth signal having a predetermined packet structure and transmitting the signal wirelessly. ; And a Bluetooth receiving module for receiving a Bluetooth signal from the Bluetooth transmitting module of the slave receiver, extracting a Bluetooth packet, and providing a signal included in the packet, and a key for receiving a key selection including channel selection and volume selection by a user. And a master receiver including an input unit and a signal processing / control unit for processing audio signals and data included in signals from the Bluetooth receiving module in response to key selection through the key input unit.

Satellite Digital Radio, SDARS, Bluetooth, Vehicles

Description

Car Satellite Digital Radio Broadcasting Receiver {Satellite Digital Audio Radio Service RECEIVER FOR VEHICLES}

1 is a block diagram of a conventional satellite digital radio broadcasting receiver.

2 is a wired connection diagram between the wired transmit and receive interfaces of FIG.

3 is a block diagram of a vehicle satellite digital radio broadcasting receiver according to the present invention.

4 is a detailed block diagram of a Bluetooth transmitter and a Bluetooth receiver of FIG.

5 is a packet structure diagram of a Bluetooth signal of the present invention.

Explanation of symbols on the main parts of the drawings

100: slave receiver 105: power supply

110: SDARS receiver 120: Bluetooth transmission module

200: master receiver 210: Bluetooth receiving module

211: wireless reception processing unit 212: baseband unit

213: receiving side link management unit 220: key input unit

230: signal processing / control unit 231: control unit

232: D / A converter 233: amplifier

121: transmitting link management unit 122: baseband unit

123; Wireless transmission processor 240: speaker

250: display PKT: Bluetooth packet

ANT: antenna ANT1: transmit antenna

ANT2: receiving antenna

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a satellite digital audio radio service (SDARS) receiver applied to a vehicle. In particular, the slave receiver and the master receiver each have a Bluetooth wireless transmission / reception function according to the IEEE 802.15.1 protocol. In the case of mounting the slave receiver outside, the present invention relates to a satellite digital radio broadcasting receiver for a vehicle that can be easily installed without additional wiring work.

Recently, as the convergence of communication technology and broadcasting technology, the demand for high quality digital broadcasting service is rapidly increasing. Digital broadcasting services include Digital Video Broadcasting-Terrestrial (DVB-T) in Europe, Digital Video Broadcasting-Handheld (DVB-H), Digital Multimedia Broadcasting (DMB) in Korea / Japan, and ISDB-T (Integrated Japan). Services Digital Broadcasting-Terrestrial, and US Digital Satellite Radio Service (SDARS) and In-band On-Channel (IBOC) digital radio.

Among them, SDARS provides satellite digital radio broadcasting service using satellites. In order to receive such digital radio broadcasting in a vehicle, attempts are being made to install a satellite digital radio broadcasting receiver in a vehicle.

1 is a block diagram of a conventional satellite digital radio broadcasting receiver.

Referring to FIG. 1, a conventional satellite digital radio broadcasting (SDARS) receiver for a vehicle includes a slave receiver (RF tuner unit) 10 largely installed outside the vehicle and a master receiver (head unit) installed inside the vehicle ( 20),

The slave receiver 10 receives a power and clock signal from the master receiver 20, a tuner 11 which removes a carrier from the SDARS signal from the antenna ANT and outputs an IF signal, and the tuner Baseband unit 12 for demodulating and decoding the IF signal from 11 to restore the baseband audio signal and data, and transmitting the audio signal and data from the baseband unit 12 by wire according to a wired transmission protocol. It includes a wired transmission interface (13).

The master receiver 20 includes a key input unit 21 for receiving a key such as channel selection and volume selection by a user, and an operation of a speaker and a display according to a key input through the key input unit 21. And a wired transmission interface 23 which receives audio signals and data according to a predetermined wired transmission protocol from the wired transmission interface 13 of the slave receiver 10 by controlling the entire operation. A D / A converter 24 for converting the digital audio signal received by the wired transmission interface 23 into an analog signal, and an amplifier for amplifying the audio signal from the D / A converter 24 ( 25, a speaker 26 for outputting an audio signal through the amplifier 25, and a display 27 for screening out data received by the wired transmission interface 23.

FIG. 2 is a wired connection diagram between the wired transmission interfaces of FIG. 1.

Referring to FIG. 2, four first to fourth lines L1 to L4 are connected between the wired transmission interface 13 of the slave receiver 10 and the wired transmission interface 23 of the master receiver 20. The first line L1 is an audio signal and data transmission line, the second line L2 is a clock line, the third line is a power line, and the fourth line is a ground line.

If the vehicle satellite digital broadcasting receiver is installed in the vehicle, the received signal is weakened due to the severe attenuation when the signal transmitted from the satellite reaches the vehicle, so the slave receiver of the SDARS receiver is attached to the ceiling or the rear glass of the vehicle. Attempts to improve reception.

However, in the vehicle satellite digital radio broadcasting receiver as described above, since the slave receiver and the master receiver must be connected by wire, in order to electrically connect the slave receiver installed outside the vehicle and the master receiver installed inside the vehicle, This can be done as a standard option by drilling holes or by cabling by the vehicle manufacturer.

However, such a conventional satellite digital radio broadcasting receiver has a problem that the installation that requires a hole in the vehicle is complicated and cumbersome in order to be mounted on the vehicle, and the aesthetic problem due to the cable is not good. In addition, since the wired transmission interface employs a dedicated IC (eg, XM / DT IC), it is difficult to expand communication with other devices.

The present invention has been proposed to solve the above problems, the object of which is that each of the slave receiver and the master receiver has a Bluetooth wireless transmission and reception function according to the IEEE 802.15.1 protocol, when the slave receiver is mounted on the outside of the vehicle, It is to provide a satellite digital radio broadcasting receiver for a vehicle that can be easily installed because no separate wiring work is required.

In order to achieve the above object of the present invention, the vehicle satellite digital radio broadcasting receiver of the present invention, the power supply unit including a solar cell; A Bluetooth transmission module for receiving power from the power supply unit and receiving a SDARS signal from an antenna and converting the signal from the SDARS receiver into a Bluetooth signal having a packet structure according to the IEEE 802.15.1 protocol and transmitting it wirelessly. A slave receiver comprising a; And a Bluetooth receiving module for receiving a Bluetooth signal from the Bluetooth transmitting module of the slave receiver, extracting a Bluetooth packet, and providing a signal included in the packet, and a key for receiving a key selection including channel selection and volume selection by a user. And a master receiver including an input unit and a signal processing / control unit for processing audio signals and data included in signals from the Bluetooth receiving module in response to key selection through the key input unit.

The packet structure is a packet structure according to the IEEE 802.15.1 protocol, wherein the Bluetooth packet includes: an access code field including a device identifier; A header field containing a packet structure and data length information of a payload; A payload field containing audio signal and data having a length defined in the head field; And an error correction code field containing a code for error correction.

The Bluetooth transmission module may include: a transmission side link manager configured to generate a predetermined packet including an audio signal and data from the SDARS receiver; A baseband section for including an error correction code in the packet from the transmission side link management section, and then modulating and coding the packet to output an IF signal; A radio transmission processing unit converting an IF signal from the baseband unit into an RF signal; And a transmission antenna for transmitting the RF signal from the wireless transmission processing unit.

The Bluetooth reception module may include: a reception antenna configured to receive an RF signal from the Bluetooth transmission module; A radio reception processor converting the RF signal from the reception antenna into an IF signal; A baseband unit which decodes and demodulates an IF signal from the radio reception processing unit, restores a packet, and corrects an error using an error correction code of the packet; And a receiving side link manager which extracts an audio signal and data of the packet and outputs it to the signal processing / control unit when the device identifier included in the packet from the baseband unit and the reference device identifier are the same.

The transmitting side link management unit adds a device identifier identical to the device identifier stored in the receiving side link management unit to the access code field of the packet.

The signal processing / control unit may include a control unit for controlling a screen output of data from the reception side link management unit; A D / A converter converting an analog signal into an audio signal from the reception side link manager; And an amplifier for amplifying the analog audio signal from the D / A converter with a preset gain.

The packet is characterized in that the 3-DH5 packet structure having a maximum transmission rate of 3Mbps.

The vehicle satellite digital radio broadcasting receiver includes: a speaker for outputting an audio signal from the signal processor / control unit; And a display for screen outputting data from the signal processing / control unit.

The power supply unit and the slave receiver are installed outside the vehicle, and the master receiver is applied to and mounted on the car audio inside the vehicle.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings referred to in the present invention, components having substantially the same configuration and function will use the same reference numerals.

3 is a block diagram of a vehicle satellite digital radio broadcasting receiver according to the present invention.

Referring to FIG. 3, a vehicular satellite digital radio broadcasting receiver according to the present invention includes a power supply unit 105, a slave receiver (or RF tuner unit) 100, and a master receiver (or head unit) 200.

The power supply unit 105, including a solar cell, supplies power required by the slave receiver 100.

The slave receiver 100 receives power from the power supply unit 105 and receives the SDARS receiving unit 110 for receiving the SDARS signal from the antenna ANT and the signal from the SDARS receiving unit 110 according to IEEE 802.15. 1 includes a Bluetooth transmission module 120 for converting into a Bluetooth signal having a packet structure according to the protocol and transmitting wirelessly.

The master receiver 200 receives a Bluetooth signal from the Bluetooth transmission module 120 of the slave receiver 100, extracts a Bluetooth packet, and provides a signal included in the packet; An audio signal included in a signal from the Bluetooth receiving module 210 in response to a key input unit 220 receiving a key selection including a channel selection and a volume selection by a user and the key selection through the key input unit 220. And a signal processing / control unit 230 for processing data.

4 is a detailed block diagram of the Bluetooth transmitter and the Bluetooth receiver of FIG. 3.

3 and 4, the Bluetooth transmission module 120 includes an audio signal and data from the SDARS receiver 110 and generates a predetermined link PKT 121 to generate a predetermined packet PKT. ), A baseband unit 122 for including an error correction code in the packet PKT from the transmission-side link management unit 121, and then modulating and coding the packet to output an IF signal, and the baseband unit 122 A radio transmission processor 123 for converting the IF signal from the radio signal into an RF signal, and a transmission antenna ANT1 for transmitting the RF signal from the radio transmission processor 123.

In addition, the Bluetooth receiving module 210, the receiving antenna (ANT2) for receiving the RF signal from the Bluetooth transmission module 120, and the wireless reception for converting the RF signal from the receiving antenna (ANT2) to an IF signal A baseband unit 212 which decodes and demodulates an IF signal from the wireless reception processor 211 to restore a packet PKT, and corrects an error using an error correction code of the packet; And a receiving side extracting an audio signal and data of the packet and outputting the same to the signal processor / control unit 230 when the device identifier included in the packet PKT from the baseband unit 212 and the reference device identifier are the same. Link management unit 213 is included.

5 is a packet structure diagram of a Bluetooth signal of the present invention.

Referring to FIG. 5, the Bluetooth packet PKT includes an access code field FD1 including a device identifier, a header field FD2 including a packet structure and data length information of a payload, and the head field. A payload field FD3 including an audio signal and data having a length defined in FD3) and an error correction code field FD4 including a code for error correction.

Such a packet may correspond to a 3-DH5 packet structure having a maximum transmission rate of 3 Mbps.

At this time, the transmitting side link management unit 121 is configured to add a device identifier identical to the device identifier stored in the receiving side link management unit 213 to the access code field of the packet.

3 to 5, the signal processing / control unit 230 includes a control unit 231 for controlling a screen output of data from the reception side link management unit 213, and the reception side link management unit ( A D / A converter 232 for converting an audio signal from 213 to an analog signal, and an amplifier 233 for amplifying the analog audio signal from the D / A converter 232 with a predetermined gain. Include.

In addition, the vehicle satellite digital radio broadcasting receiver includes a speaker 240 for outputting an audio signal from the signal processing / control unit 230, and a display for outputting data from the signal processing / control unit 230. 250).

Hereinafter, the operation and effects of the present invention will be described in detail with reference to the accompanying drawings.

When the vehicle satellite digital radio broadcast receiver of the present invention is installed in a vehicle, that is, the slave receiver 100 and the power supply unit 105 of the receiver are installed outside the vehicle such as a vehicle roof, and at the same time, the master of the receiver When the receiver 200 is installed inside the vehicle, the master receiver 200 may be implemented as car audio, and an operation thereof will be described with reference to the accompanying drawings.

3 to 5, the power supply unit 105 of the present invention, including a solar cell, generates power from sunlight and supplies power required by the slave receiver 100 installed outside the vehicle. Accordingly, the slave receiver 100 operates by receiving power from the power supply unit 105.

Here, the power supply from the conventional slave receiver is made through a cable connecting the wired transmission interface by wire. In contrast, in the receiver of the present invention, since wireless communication is performed between the slave receiver and the master receiver, a solar cell is attached as a power supply unit for power supply of the slave receiver. Most of the slave receivers are attached to the ceiling of the vehicle, so they are exposed to the sun, which makes it possible to charge and use solar power.

When the power is supplied to the slave receiver 100 in the power supply 105, the slave receiver 100 receives an SDARS signal of approximately 2.3 GHz from the antenna ANT.

More specifically, the SDARS receiver 110 of the slave receiver 100 receives the SDARS signal from the antenna ANT and restores the audio signal and data included in the SDARS signal. Here, the audio signal corresponds to a radio signal of SDARS, and the data corresponds to radio program related information and other service information related to radio broadcasting.

The Bluetooth transmitting module 120 of the slave receiver 100 converts the signal from the SDARS receiving unit 110 into a Bluetooth signal having a packet structure according to the IEEE 802.15.1 protocol and transmits it wirelessly.

Next, the master receiver 200 of the present invention receives the Bluetooth signal from the slave receiver 100 to restore the original audio signal and data.

More specifically, the Bluetooth reception module 210 of the master receiver 200 receives a Bluetooth signal from the Bluetooth transmission module 120 of the slave receiver 100, extracts a Bluetooth packet, and is included in the packet. Provide a signal. In this case, the key input unit 220 may input a key selection including a channel selection and volume selection desired by the user. Thereafter, the signal processing / control unit 230 of the master receiver 200 processes the audio signal and data included in the signal from the Bluetooth receiving module 210 in response to the key selection through the key input unit 220. do.

The Bluetooth transmission module 120 will be described with reference to FIGS. 3 and 4.

The transmission side link manager 121 of the Bluetooth transmission module 120 generates a predetermined packet PKT including the audio signal and data from the SDARS receiver 110 and outputs the predetermined packet PKT to the baseband unit 122. do. The baseband unit 122 includes an error correction code in the packet PKT from the transmission side link management unit 121, modulates and codes the packet, converts the packet into an IF signal, and then wirelessly transmits the IF signal. It outputs to the processing part 123.

Here, the Bluetooth transmission module 120 modulates using a frequency shift keying (FSK) method and performs coding using a frequency hopping spread spectrum (FHSS) method. In general, Bluetooth uses a channel width of 1 MHz and has a transmission rate of 1 Mbps. However, as is known, when using a 3-DH5 packet structure, Bluetooth has a maximum transmission rate of 3 Mbps.

The wireless transmission processor 123 converts the IF signal from the baseband unit 122 into an RF signal of approximately 2.4 GHz band to a master receiver 200 installed in the vehicle through the transmission antenna ANT1. Send.

At this time, the wireless reception processing unit 211 of the Bluetooth reception module 210 receives the RF signal from the Bluetooth transmission module 120 through the reception antenna ANT2 and converts it into an IF signal and outputs it to the baseband unit 212. do. The baseband unit 212 restores the packet PKT by decoding and demodulating the IF signal from the radio reception processing unit 211 and corrects an error using an error correction code of the packet.

Here, the Bluetooth receiving module 210 performs FHSS decoding and FSK demodulation in response to FSK modulation and FHSS coding in the Bluetooth transmission module 130.

Subsequently, the reception side link management unit 213 of the Bluetooth reception module 210 is the same as the device identifier and the reference device identifier included in the packet PKT from the baseband unit 212, the audio signal and data of the packet Is extracted and output to the signal processing / control unit 230.

If the device identifier and the reference device identifier are not the same, the audio signal and data of the packet are not processed.

Here, the Bluetooth packet PKT includes an access code field FD1 including a device identifier, a header field FD2 including data length information of a packet structure and a payload, as shown in FIG. A payload field FD3 including an audio signal and data having a length defined in the head field FD3, and an error correction code field FD4 including a code for error correction. Such a packet may correspond to a 3-DH5 packet structure having a maximum transmission rate of 3 Mbps.

Meanwhile, communication can be performed using a device identifier included in the Bluetooth packet. For this communication, the transmitting side link manager 121 stores the device identifier stored in the receiving side link manager 213. Adds the same device identifier as the access code field of the packet.

3 to 5, the control unit 231 of the signal processing / control unit 230 controls the screen output of the data from the reception side link management unit 213. The D / A converter 232 of the signal processor / control unit 230 converts an audio signal from the reception side link manager 213 to an amplifier 233 to output an audio signal to the amplifier 233. 233 amplifies the analog audio signal from the D / A converter 232 to a preset gain and outputs the same through the speaker 240. Accordingly, the master receiver 200 of the present invention can listen to the SDARS.

In addition, the display 250 of the in-vehicle satellite digital radio broadcasting receiver outputs data from the signal processing / control unit 230.

In the reception apparatus of the present invention as described above, for transmitting high-quality data, the Bluetooth transmission module 120 and the Bluetooth reception module 210 based on the Bluetooth EDR (Enhanced Data Rate) version capable of high-speed communication is equipped with It is preferable. In wireless communication, it is generally known that a data rate of about 2Mbps is required to provide a CD level sound quality. Each Bluetooth module of the present invention is implemented in a packet form 3-DH5 in a Bluetooth EDR version, and has a maximum speed of 3Mbps (header portion). Except for the maximum data rate, 2178.1kbps) is supported. Therefore, this packet type can provide CD quality high quality service.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, but is defined by the claims, and the apparatus of the present invention may be substituted, modified, and modified in various ways without departing from the spirit of the present invention. It is apparent to those skilled in the art that modifications are possible.

According to the present invention as described above, in a satellite digital audio radio service (SDARS) receiving apparatus applied to a vehicle, each of the slave receiver and the master receiver is provided with a Bluetooth wireless transmission and reception function according to the IEEE 802.15.1 protocol. In this way, when the slave receiver is mounted on the outside of the vehicle, there is no need for a separate wiring work, so that the installation can be easily performed.

In other words, by using the Bluetooth wireless communication using the 2.4GHz band for the slave receiver and the master receiver, a separate cable connection is unnecessary, so there is no need to drill a hole for the cable connection. Accordingly, installation and setting are simple, and the environment inside the vehicle can be kept clean. In addition, although communication is possible only with devices connected to a wired cable in the related art, compatibility between other devices is easy because Bluetooth communication using a standardized IEEE 802.15.1 protocol is used. That is, it is advantageous in terms of scalability because communication between up to seven devices is possible by constructing piconet between devices.

Claims (10)

A power supply unit including a solar cell; A slave receiver including a SDARS receiver receiving power from the power supply unit, receiving an SDARS signal from an antenna, and a Bluetooth transmission module converting the signal from the SDARS receiver into a Bluetooth signal having a predetermined packet structure and transmitting the signal wirelessly. ; And A Bluetooth receiving module for receiving a Bluetooth signal from the Bluetooth transmitting module of the slave receiver and extracting a Bluetooth packet to provide a signal included in the packet, and a key input unit for receiving a key selection including channel selection and volume selection by a user. And a master receiver including a signal processing / control unit for processing audio signals and data included in a signal from the Bluetooth receiving module in response to the key selection through the key input unit. The packet structure is a packet structure according to the IEEE 802.15.1 protocol, The Bluetooth packet may include an access code field including a device identifier; A header field containing a packet structure and data length information of a payload; A payload field containing audio signal and data having a length defined in the head field; And an error correction code field comprising a code for error correction, The Bluetooth transmission module may include: a transmission side link manager configured to generate a predetermined packet including an audio signal and data from the SDARS receiver; A baseband section for including an error correction code in the packet from the transmission side link management section, and then modulating and coding the packet to output an IF signal; A radio transmission processing unit converting an IF signal from the baseband unit into an RF signal; A transmission antenna for transmitting an RF signal from the wireless transmission processing unit, The Bluetooth reception module may include: a reception antenna configured to receive an RF signal from the Bluetooth transmission module; A wireless reception processor converting an RF signal from the reception antenna into an IF signal; A baseband unit which decodes and demodulates an IF signal from the radio reception processing unit, restores a packet, and corrects an error using an error correction code of the packet; And a receiving side link manager which extracts an audio signal and data of the packet and outputs it to the signal processing / control unit when the device identifier included in the packet from the baseband unit and the reference device identifier are the same. Vehicle satellite digital radio broadcasting receiver, characterized in that. delete delete delete delete The transmission side link management unit of claim 1, wherein And a device identifier equal to the device identifier stored in the reception side link manager is added to the access code field of the packet. The method of claim 6, wherein the signal processing / control unit A control unit controlling a screen output of data from the reception side link management unit; A D / A converter converting an analog signal into an audio signal from the reception side link manager; And An amplifier for amplifying the analog audio signal from the D / A converter with a preset gain Vehicle satellite digital radio broadcasting receiver comprising a. The method of claim 1, wherein the packet is Vehicle satellite digital radio broadcasting receiver, characterized in that the 3-DH5 packet structure having a maximum transmission speed of 3Mbps. The apparatus of claim 1, wherein the vehicle satellite digital radio broadcasting receiver A speaker for outputting an audio signal from the signal processing / control unit; And Display for outputting data from the signal processing / control unit Vehicle satellite digital radio broadcasting receiver further comprises. The method of claim 1, wherein the power supply unit and the slave receiver Installed outside the vehicle, The master receiver Vehicle satellite digital radio broadcasting receiver, characterized in that applied to the car audio inside the vehicle.

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