What is the difference between analog and digital recording?

Answer 1

Although over 50 years old, the standard television signal is still one of the most common way to transmit an image. Figure 23-9 shows how the television signal appears on an oscilloscope. This is called composite video, meaning that there are vertical and horizontal synchronization (sync) pulses mixed with the actual picture information. These pulses are used in the television receiver to synchronize the vertical and horizontal deflection circuits to match the video being displayed. Each second of standard video contains 30 complete images, commonly called frames. A video engineer would say that each frame contains 525 lines, the television jargon for what programmers call rows. This number is a little deceptive because only 480 to 486 of these lines contain video information; the remaining 39 to 45 lines are reserved for sync pulses to keep the television's circuits synchronized with the video signal.

Standard television uses an interlaced format to reduce flicker in the displayed image. This means that all the odd lines of each frame are transmitted first, followed by the even lines. The group of odd lines is called the odd field, and the group of even lines is called the even field.

Answer 2

In analog the signal is in the form of a waveform , i.e recorded as a voltage in a magnetic tape, or any other device. It is susceptible to deterioration of quality over a period of time.

In the digital form the signal is digitized into number 0 and 1, by using a suitable sampling rate depending on the frequency of interest (Nyquist criteria) and recorded on any magnetic medium. The advantage is longer storage life and no deterioration over time. It can have a higher dynamic range to cover a wider range of frequencies, with a better reproduction of the input signal.

Answer 3

The world of digital video video is here. It seems every phone and digital camera these days has the ability to take video, and some with stunning quality. High-end wedding videographers are even switching from the tried and true digital video camcorders of yesteryear to digital SLR cameras capable of recording 720p HD video. But it seemed like just a few months ago that digital video used to mean video shot onto digital videotape. And the advantages between recordings digital video camcorders and analog camcorders were numerous.

Digital vs. Analog VideoDigital camcorders possess many advantages over their analog predecessors. Due to the advances in technology that came with the introduction of Digital Camcorders, we highly recommend you no longer shoot with Analog formats. But it is important to note that not all digital video is the same - we are talking here about camcorders that record video to digital tape formats, not your handheld digital camera that records compressed video to a digital file. Unless you have a high-end Digital SLR that records to HD video, you will still get better quality shooting to tape with your Digital camcorder.

Here's why we recommend Digital Video over Analog Video:

• Higher-quality recorded video signal

  Analog video uses an electrical signal to capture video images onto magnetic tape, while a digital video signal begins and remains digital. No quality is lost when you copy your video. It is also much easier to record and capture video to your computer directly via Firewire. Analog video degrades with each copy and requires a special video capture card or analog-to-digital converter box in order to import video onto your computer.

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Answer 4

it is analog singnal