Techno Tidbits & Problem-solving

Dolby Digital

Dolby Digital is a compression format which records the sound of 6 channels of the theater surround system (Dolby Digital) on the movie film digital track. Of the 6 channels, the sub woofer channel is intended for bass only, and because the frequency range is smaller than the main channel, it is expressed as 5.1 channel.

Dolby Digital is the name of the Dolby surround multi-channel digital system that was developed after the Dolby Surround System and Dolby Pro Logic Surround System.

5.1 channel digital

4 channel analog

surround track

sound track (Matrix)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Dolby

Digital

encoding

Dolby Digital for movie films

The number of movies made using Dolby Digital since 1992 has exceeded 300 and continues to increase. For compact disc players and laser disc digital sounds, 16 bits are used to sample the original analog audio waveform and sampling is carried out 44,100 times every second. However because an enormous amount of recording signal data is required for the multi channel system with this method, AC-3 is used to compress the data.

In reproducing audio signals, the smaller the bit number used, the lower the sound quality. With AC-3, drop in auditory sound quality is prevented by using masking technology and digital filtering technology based on the human auditory characteristics.

Laser disc format

Laser discs are now available on the market in large numbers. This means that the recording of different format audio signals on the laser disc raises the important question of compatibility with existing laser discs. Dolby Digital tracks on Laser discs record signals using the space of one analog audio channel so it will maintain compatibility with existing discs and players.

As shown in the following figure, the digital audio sounds of Dolby Digital discs can be played back as currently done. Analog sounds are played back by using the other channel without the Dolby Digital signals for monaural audio signals.

Analog sound

Dolby Digital

(Monaural)

sound

Digital sound

Video

Frequency

2

4

6

8

10

12

14 MHz

Comparison with Dolby Pro Logic Surround

Dolby Digital is also known as the 5.1 channel system. It is equipped with 5 channels (front left, front right, center, surround left, surround right) in the frequency range from 20 Hz to 20 kHz and an independent Low Frequency Effect (LFE) channel. The sub woofer channel is also called Low Frequency Effect (LFE).

The sub woofer channel can be used as desired to enjoy strong bass sounds.

The table on the next page shows the comparison with Dolby Pro Logic Surround effects.

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Pioneer VSX-29TX manual Techno Tidbits & Problem-solving, Dolby Digital, Laser disc format
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VSX-29TX specifications

The Pioneer VSX-29TX is a highly regarded audio-video receiver that combines advanced technology and robust performance, making it a popular choice among enthusiasts seeking immersive home theater experiences. Released as part of Pioneer's esteemed VSX series, this receiver is designed to deliver exceptional sound quality and versatility for all forms of media.

At the heart of the VSX-29TX is its powerful amplification system, which provides a robust output, ensuring that even the most demanding audio tracks are handled with ease. The receiver boasts a high current capability that allows it to drive larger speakers while maintaining clarity and precision. Thanks to its multi-channel processing, it can support various configurations, including 5.1 and 7.1 surround sound setups, enhancing the auditory experience for movies, music, and games.

One of the standout features of the VSX-29TX is its advanced surround sound processing technology. It incorporates Dolby Digital and DTS decoding, allowing for the playback of high-quality audio formats. The receiver also supports various sound modes that can be easily tailored to the specific content being enjoyed. Whether you're watching an action-packed film or listening to classical music, the VSX-29TX ensures that the audio is both dynamic and engaging.

Connectivity is a crucial aspect of any receiver, and the VSX-29TX excels in this area, featuring multiple inputs and outputs that cater to a wide range of devices. With several HDMI ports, digital optical and coaxial inputs, and analog connections, users can easily connect their Blu-ray players, gaming consoles, and streaming devices. This extensive compatibility allows for a seamless integration of various audio-visual components.

Additionally, the VSX-29TX is equipped with Pioneer's proprietary technologies, including the MCACC (Multi-Channel Acoustic Calibration System). This system automates the calibration of speaker settings by analyzing the room's acoustics, resulting in an optimized listening environment. This feature minimizes the hassle of manual configuration and provides an enhanced audio experience tailored to the unique characteristics of your space.

In terms of durability and design, the receiver sports a sturdy build with a sleek aesthetic, making it an attractive addition to any home entertainment setup. Its user-friendly interface and remote control allow for easy navigation through settings and inputs, ensuring that users can enjoy their favorite media without complications.

In summary, the Pioneer VSX-29TX is a versatile and powerful AV receiver that stands out for its advanced surround sound capabilities, robust amplification, and comprehensive connectivity options. With features like MCACC for room calibration, it truly elevates the home theater experience, making it a solid choice for audio enthusiasts and casual viewers alike. Its combination of technology, performance, and user-friendly design solidifies its place in the competitive landscape of home audio solutions.
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