and one optical from TV to RECEIVER...is it sufficient connection..?
The optical connection will carry only audio data. You also need to use a composite or component for video connection.
and can anybody tell where i can get information about different 5.1 channel audio formates ??(i want to know what is PCM multichannel audio which i found in many HD movie and TV series ? )
The two main 5.1 audio formats for movies are Dolby and DTS. There are umpteen variations of these in the market. For details on Dolby look at
Dolby Technology India Private Limited. For details on DTS, please visit
DTS | Home.
What is PCM? Let us go back a little to understand this.
When a movie is shot, the audio is (at at least was) recorded in analogue domain. In a standard film roll, the analogue audio signal is part of the film (outer edges) and is read by special sensors on the projector.
When we come to watching a movie using a DVD, there is not enough space on the media to store all the audio signals. So the analogue signal is digitised and then compressed using various algorithms, mostly owned by Dolby and DTS. When you play the DVD, the player decodes the algorithm and recreates the analogue signal that is amplified and played on your speakers.
The digital representation of any analogue wave is called PCM. What is done is that the analogue wave is sampled at regular intervals and represented by a digital wave. A PCM has two parts - (one) a sampling rate that represents the number of times the analogue wave is read or sampled. This is shown as xxx kHz or so many kilo hertz (or samples) per second. The second is called depth that represents the number of digital samples that are created. This is usually called xx bits. The higher the sampling rate and the higher the bit, the closer the digital wave or PCM is to the original analogue wave.
An audio signal stored on a DVD or Blu-Ray, thus, has multiple parts:
1. A digital representation of 6 or 8 channels of audio called PCM streams or data.
2. A compression methodology for storing the 6 or 8 channels of PCM data.
When playing, what is done is as follows:
1. A decoder reads the compressed data and creates 6 or 8 channels of PCM data.
2. A DAC reads all the channels of PCM and converts them to analogue signals for amplification and playing on speakers.
When you connect a DVD/BR Player or any source to an AVR, you can send the audio data in multiple ways.
1. The player can decode, execute the DAC and create 6 or 8 channels of analogue audio. This is sent in analogue form to the receiver that just amplifies and plays the audio signals.
2. The player can decode and create 6 or 8 channels of PCM. This is sent in digital form to the receiver that does a DAC on each channel, amplifies and then plays the audio on the speakers. This is usually referred to as PCM or multichannel audio.
3. The players does nothing. It just picks up the compressed audio data and sends it as is to the receiver. The receiver decodes and does a DAC followed by amplification and playing. This is usually referred to as bitstreaming or sending data in raw format.
Cheers
