Car digital system

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Car digital system [Copy link]

Car GPS navigation system:

　　Some people may not be unfamiliar with the GPS system. Although it was originally established for military purposes, it has quickly developed greatly in the civilian field.

　　The car GPS navigator can receive data parameters sent by satellites 24 hours a day, so that drivers can know their three-dimensional position, three-dimensional direction, movement speed and time information at any time. Combined with electronic map data, they can always know the situation between their current position and destination. The autonomous navigation mode does

　　not charge any usage fees, and users can selectively purchase map data according to their needs.

The car GPS has the following powerful functions:

　　1. Navigation function

　　After the user marks two points on the car GPS navigation system, the navigation system will automatically design the best route for the owner according to the current position. In addition, it also has a modification function. If the user accidentally misses the intersection and does not take the best route recommended by the car GPS navigation system, and the vehicle position deviates from the best route track by more than 200 meters, the car GPS navigation system will redesign a best route for the user according to the new position of the vehicle.

　　2. Turning voice prompt function

　　As long as the vehicle encounters an intersection ahead or turns, the vehicle-mounted GPS voice system will prompt the user to turn. It can also provide full voice prompts, so that the driver can complete the entire navigation process without observing the display interface.

　　3. Adding points of interest function

　　Since most cities in China are under construction, new buildings may pop up anytime and anywhere. If you encounter some target points that are not on the electronic map, as long as you are interested or think it is necessary, you can add the point or new route to the map. These newly added points of interest, like any original point on the map, can be applied to electronic map query and other functions.

　　4. Positioning

　　GPS can accurately determine its location by receiving satellite signals, with a position error of less than 10 meters. At the same time, GPS can also replace the traditional compass to display the direction, replace the traditional altimeter, and display information such as altitude.

　　5. Speed measurement

　　Through the reception and calculation of GPS satellite signals, the specific speed of driving can be calculated, which is much more accurate than the general odometer.

　　6. Display track

　　If you go to an unfamiliar place and someone leads the way when you go, what should you do when you come back? Don't worry, GPS has a track recording function, which can record the route your vehicle has traveled and even show the difference between two lanes. When you come back, you can let it lead you home smoothly along the route you came.

　　Car digital camera

　　Hitachi has recently developed a new car digital camera. The camera can identify the lanes of the road. If the car deviates from the route, the system will issue a warning; the camera can also automatically measure the driving distance between the car and the vehicle in front; another function of the camera is to sense the clouds and rain outside the car. If the weather turns cloudy or rainy, the windshield wipers will automatically work and the car can automatically turn on the lights.

　　This new camera is placed in the inner cavity of the car light, and the test product uses a high-performance central processor. The product is 5.5cm long and 16cm wide. Hitachi technicians said that the camera has computer processing functions and is still relatively large at present. It will be improved to the size of a business card in the future.

Car phone

Although cars and mobile phones have a very congenial relationship, the laws of many countries prohibit the use of mobile phones while driving. Because it is extremely dangerous for drivers to hold a mobile phone in one hand while driving, it often causes traffic accidents. Car phones are products that take into account both driving safety and convenience and fashion. They have been widely used as standard equipment in cars in developed countries and regions such as Europe and the United States.

Car phones require higher signal reception performance than general commercial mobile phones. With a dedicated car antenna, they can still maintain excellent call quality in a car with high shielding and electromagnetic interference.

In order to fully ensure driving safety, car phones are equipped with functions such as hands-free calling, automatic switching of in-car audio, and voice prompts. There is no need to watch the screen when answering a call or making a call on the mobile phone. The original car audio speaker will issue a voice prompt. At the same time, considering the privacy needs of the car owner, some car phones also come with confidential call headsets.

　In addition, in order to facilitate recording of relevant information while driving, car phones are also specially equipped with a recording function. As long as the recording button is pressed, the voice information of the phone or the car can be recorded in segments.

　　If it is a car phone with Bluetooth, there is no need to insert the mobile phone SIM card into the car phone to use the car phone function. This car phone system can wirelessly access the mobile phone number, user ID, telephone service company, phone book and other information recorded in the SIM card through Bluetooth, and automatically log in to the GSM network. Once a passenger with a SIM phone enters the car, the system will be switched to the car system. If you get off the car with your phone or operate the phone keyboard, it can be used as a normal phone.

　　For safety reasons, some car phones also have a network remote control function. The owner can use the pre-set phone (up to 5) to remotely control the vehicle within the GSM network. Functions include: remote control of air conditioning, sound and light alarm, tracking and positioning, oil and circuit cut-off, etc. The biggest benefit of

　　a car MP3

　　for car owners with MP3 players is that they can enjoy their favorite songs throughout the journey, but can it be connected to the car audio? Of course you can. Through the MP3 car audio companion (i.e. car audio access device), the audio of various portable music playback devices, such as MP3 players, portable CD players, etc., can be output to the car and played through the car audio system. The car audio companion generally uses the DC12V/50mA of the car cigarette lighter as the power source.

　　How to use: 1. Plug the plug of the Car Audio Companion into the cigarette lighter jack of the car; 2. Plug the audio input plug of the Car Audio Companion into the headphone jack of your MP3; 3. Turn on the MP3 and adjust the volume to a wide range; 4. Set the frequency of the car's FM radio to the frequency marked by the Car Audio Companion or let the FM radio automatically search for the frequency to listen to music.

　　The iPod launched by Apple Computer has always been a hot-selling product in the portable digital music player market. At present, American electrical appliance manufacturers are tailoring a connection device for iPod to enable it to play music through the car audio.

　This device can connect the iPod to the car audio system, and the digital music stored in it can be played through the car audio speakers. The driver can directly control the iPod by selecting tracks and adjusting the volume through the operation buttons on the car audio.

　　USA Today said that using the car audio to play digital music will improve the listening effect of the iPod, and it is also safer than listening to the iPod with headphones while driving.

　　Experts predict that iPod car audio connection devices are a huge and lucrative market. From Christmas to New Year last year, Apple Computer sold more than 4 million iPods. Phil Lee of the US Digital Media Research Company said that 60% of music listening occurs in cars.

　　Currently, Pioneer Electronics, Alpine Electronics Co., Ltd., BMW AG and Daimler-Chrysler AG have all stated that they will launch iPod car connection devices.

　Car TV

　　The function of car TV has been upgraded from providing simple VCD playback to DVD audio and visual effects. The original CRT monitor is gradually being replaced by lighter and thinner LCD monitors, and some products have been integrated with satellite navigation systems. If you install a car TV tuner with an antenna, you can also watch TV directly.

　　Some car TVs are specially installed on the back of the headrest of the front seat for passengers in the back seat to enjoy the audio-visual world.
　　In addition, we can also turn the car TV into a display for a digital camera. The method is very simple. First, we connect the VIDIA output of the digital camera to the VIDIA output of the LCD TV through a cable, and then set the digital camera to "Playback" mode. The car LCD TV will start to receive the signal from the digital camera and display it. Due to the advantages of LCD TV itself in color and restoration, when it is used as a display for a digital camera, we will find that the effect it shows is very good! In the early days

　　of car DVD

　　, it was definitely a proud thing for car owners to have a set of good sound quality audio based on cassettes, CDs, and radio coordinators. In recent years, with the continuous upgrading of technology, the public has begun to crave a set of integrated audio-visual entertainment systems to accompany boring journeys, playing discs, watching TV, listening to music, and receiving radio as they please. Next, let's take a look at the core of this car audio and video system - car DVD.

As equipment supporting the car, car electronic products must take into account issues such as sports shockproof, heat/cold protection, and coordination with the car environment. The technical requirements are much higher than those of home appliances. The dedicated car DVD movement is required to work normally at -10 degrees Celsius to 50 degrees Celsius, and has better performance in shock resistance than ordinary consumer-grade (ordinary home players). At the same time, it adopts dual-mode anti-vibration technology combining electronic anti-vibration and mechanical anti-vibration (super DDSS anti-vibration system). The so-called electronic anti-vibration system is to pre-read the disc information for a few seconds and store it in the chip. When the CD player is subjected to strong vibration, the laser head will stop working for protection. At this time, the chip automatically releases the pre-stored information, so you can't feel the pause of the playback. The multi-level shock absorption effectively ensures that the product can still play the disc smoothly in the severe vibration.

　　The car DVD is powered by the low-voltage power supply of 12V of the car, and it must ensure that the power supply can work normally when it drops to 10.5V, and output 45W phase × 4 high power. In this way, whether it is a large movie with wide dynamics or soft music like a chant, it can be perfectly reproduced, so that when people are in the special listening space of the car, they have a strong sense of the scene and feel surrounded by a heavy sound field, which is enough to make people forget the fatigue of the journey and feel at ease.

　　The difference between car audio and home audio is that it also faces the test of various external interferences, such as the interference of the engine ignition device and other electrical appliances that share a battery. As for radio reception, when a car is driving on the road, it is subject to changes in direction and the influence of the external environment (such as tall buildings, bridges, power lines, etc.). To ensure normal radio reception, the radio part must have high performance in terms of sensitivity, selectivity, and S/N (signal and noise) ratio. It also has high requirements for AGG (automatic gain control) and AFC (automatic frequency control).