CD drives: overview, types, features and reviews

The Era of CDs, and therefore, and all related technology, is slowly but surely coming to an end. However, there are still fans of classical music performance or movies. In the same way as gramophone records. CD-ROM drives are special devices — players CDs. The article presents an overview of such devices, their characteristics and interesting features.

Appearance

Strangely enough, but scientists have made advances in laser processing of CD-ROM before he developed the first personal computers. To this discovery was made by two Russian inventors - Alexander Prokhorov and Nikolai Basov. They have created the basis for the technology is the first cold laser. For which he received the Nobel prize. Further development and the creation of a full-fledged reader and, in fact, the media began to deal with Philips and Sony.

Main engines in promoting technology CD-ROM drive were IT giants - Microsoft and Apple.

For a Long time, Sony and Philips could not come to a common denominator in the issue of the amount of data stored. Originally Sony offered a disk size of 100 mm, and Philips — 115.

According to one version, the disc size should be enough to save Symphony No. 9. Such was the setting, which eventually formed the basis of the standard CD-ROM.

In the end, both companies agreed that for a standard is adopted, the size of 120 mm, a duration of 74 minutes and a frequency of 44.1 kHz.

Development of the

Work on the CD-ROMs did not stop in 1996 in Japan there's a new standard — DVD. Its minimum volume — 4.7 GB. At that time it was enough for a full-length film in acceptable quality. The improvement of this technology has led to the possibility of using both sides of the disk, as well as several operational layers on them. It is possible to increase the total amount to 17 GB.

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Parish MP3

About MP3 heard, probably, everyone who has ever downloaded music from the Internet. This format broke into the world of sound and turned everything on its head.

In General, MP3 is the codec that is the mechanism of compressing and decompressing audio data by a special algorithm. He was allowed to write to the CD's music in total is many times larger than the standard 74 minutes and In particular, a conventional CD could “enter” about 200 songs in MP3 format. At the moment it is the most popular and best-known type of files of musical works and compositions.

However, to play this type required a special player with the appropriate codec. So there was a player CD MP3 CDs.

How is the reading from a CD-ROM?

The CD Player reads data using a laser beam. The principle is accounting for changes in intensity of light reflection from the surface. Thus the counting of alternating recesses on the base disk.

The rotation of the disc occurs due to the engine. The reading head also does not stand still. With the help of actuators it moves from the disk center to its edge.

At the start of the operation, the device reads the data from the header located at the beginning of the disk, i.e. where the diameter is smaller. Using the obtained information, the system learns what kind of place is this or that piece of music, movie or data. And can quickly to position the sensing head in the right place.

Sometimes the reading head for one reason or another turns out to be contaminated. And since it is located inside the device, then you can make manual cleaning there is no possibility.

Therefore, you use a special cleaning CD player. They can be both dry and wet. On their surface is coated with a special cleaning element, which at rotation touches the lens, thereby cleaning it.

However, judging by user feedback, this approach is not always doing its job and many people recommend to spend time on the analysis of the device and clean the item manually.

The First CD players

The Founder of the series was the CDP-101 from Sony. At the time it was very expensive. Reading produced an optical sensor with a semiconductor laser through digital reading.

First include it note that you can quickly select the song and her situation. As the indicator used a simple display that showed the time of a musical composition.

As the pitch of the drive has been used leaving the tray. The whole process control was implemented using ten physical buttons.

This unit was the beginning of standards in the industry of devices for reading CD-ROMs.

"Estonia PL-001 Stereo"

The First domestic CD disks became "Estonia PL-001". He produced the Tallinn plant “Punane RET”.

He had all inherent in this type of player functions — reading music tracks and a quick transition from track to track.

Of Course, the expression “domestic” technically inaccurate, as most of the components was Philips — the leader in the industry at the time.

The Modern market of players

Nowadays, the device to play a CD allyou can also find on the shelves of electronics stores. However, now they do not know. Modern CD and DVD drives — it is multifunctional, complicated technical device with many “chips” and features.

Onkyo C-N7050

The appearance of the player, reminiscent of the classic devices from the 90s. However, it is “stuffed” says the opposite.

The Device is equipped with USB ports for connecting other devices. Thus it is possible to broadcast sound with more mobile gadgets directly to the CD player.

There is Also a Ethernet port for connection with a computer.

The List of supported formats is quite extensive — MP3, AAC, FLAC, WAV and other known types.

Philips EXP2540/02

The Brightest representative of family of portable CD players.

Made in an elegant white design. Supported formats-MP3, CD, CD-R, CD-RW, it can play back in various modes. For example, in a random order or repeat one song.

As the sound source use standard 3.5 mm headphones. For indication during operation meets the LCD display, which displays information about the number of album, degrees of battery power, features and track time.

Magic ESP allows you to play songs without jerks during the beating or shaking. It is based on caching portions of the track to avoid interruption of sound.

Panasonic SL-SW405

Another portable CD player. The feature — resistance to drops and shocks. Rubberized case protects from dust and even water.

LCD display shows current information about tracks, their duration, battery status.

Has a built-in equalizer that allows you to configure the sound for “gourmet” sound.

One of the interesting functions — the ability to program a sequence of tracks.

As the power sources are two batteries of format AA. This compact CD player is perfect for listening to music on the go, walking, Jogging and travel.

The Future of CD and user reviews

As such, the future of CD-ROM no. Technology is evolving and there are new methods of transmission and storage. And now Flash drives are gradually gaining market share. Their volumes, speed and reliability significantly exceed the parameters of the CD.

In this regard, users increasingly are evaluating CD players in the background of new developments. For example, often complain about the lack of wireless in the stationary CD-players. But it is for this and created — to listen to music from a CD. No need to create other sources of sound, especially of such as a network. But some manufacturers still implement in their products the opportunity, thereby making the classic CD player and the usual mediator for audio transfer.

Another important requirement of users to CD players, particularly portable, was the presence of the so-called "anti-shock". That is, the protection mechanism of the shake-up that could suddenly interrupt a song or even to move to the next. This was also associated with a number of reviews at a time when CD=player was a fashionable novelty, rather than an archaic device.