The Industry Standard Architecture of a 16-bit sound card

Date: 2011.12.23 | Category: TV | Tags:

The voice in your computer that you know when you receive new e-mail is made possible with sound card. Appearances before the sound card, personal computers were limited to beeps from a small speaker on the motherboard. In the late ’80s, sound cards started working in computer multimedia and computer games led to a whole different level. In 1989, Creative Labs introduced the Sound Blaster sound card Creative Labs ®. Since then, many other companies have introduced sound cards and Creative SoundBlaster cards continued to improve. Anatomy of a sound card sound cards includes: A digital signal processor (DSP) that controls the computation · A digital-analog converter (ADC) to enter into calculating its audio read-only memory (ROM) or flash memory for storage · data musical instrument digital interface (MIDI) for connecting external music devices (for most cards, the game port is also used to connect an external MIDI adapter) · jacks for connecting speakers and microphone, as well as other inputs and outputs · A game port to connect a joystick or gamepad current sound cards are usually installed in PCI slot, while some older and cheap to install the ISA bus. Many of today’s computers sound card that incorporates a chipset on the motherboard. This leaves one slot free for other peripherals. SoundBlaster Pro is considered the standard for sound cards. Almost all sound cards on the market today are at least compatible with SoundBlaster Pro. Creative Labs SB4740 PCI Sound Blaster 16

The history of the clock

It is believed that the clock, as it is known today was invented in 1300, but there is no exact date for it. Tools for knowledge of time of day have existed since antiquity. The Egyptians built the solar clock, the obelisk. Times were determined by how moved the earth’s shadows made ​​by sunlight. It helps to know what time of day were. Also, another primitive model of measuring time is hourglass. It is a glass vessel with two rooms. The above is a quantity of sand, water or mercury drop bottom compartment in a certain period of time. Hourglass has been used in Europe in the 14th century. The first public clock was made and erected in Milan, Italy, in1335. People did not have clocks in their homes until the 14th century. In 1500 a German locksmith Peter Henlein called began making small clocks but only arm had to tell time, not the one for minutes and had no protective glass top. These watches were the size of a hockey puck and were carried in the hand or pocket, not the wrist. Wristwatch appeared in the First World War. It was wornfor the first time the French physicist, Blaise Pascal. In 1577, Jost Burgi invented the arm for minutes. The first electronic watch that uses a battery appeared in 1953.