Additional Information

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)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AC-3

encoding

AC-3 for motion pictures

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 personal 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 records signals using one analog audio channel to maintain this 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

 

 

 

 

 

 

(Monaural)

 

 

 

Digital

 

 

 

 

 

 

Video

 

 

 

 

 

 

 

 

 

 

 

 

 

sound

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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 sub woofer channel. The sub woofer channel is also called LFE (Low Frequency Effect).

The LFE 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-21 manual Additional Information, Dolby Digital, Laser disc format, Comparison with Dolby Pro Logic Surround
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VSX-21 specifications

The Pioneer VSX-21 is a high-performance AV receiver that caters to both audiophiles and home theater enthusiasts. Known for its robust features, advanced technologies, and solid build quality, the VSX-21 offers an immersive audio-visual experience that enhances any entertainment setup.

One of the standout features of the VSX-21 is its support for multichannel audio formats. It is equipped with Dolby TrueHD and DTS-HD Master Audio, allowing users to experience high-definition sound that matches the quality of high-definition video. This capability make the VSX-21 an excellent choice for those who want to enjoy movies and music in their most dynamic and powerful form.

In terms of connectivity, the VSX-21 includes multiple HDMI inputs, offering seamless integration with modern devices such as Blu-ray players, gaming consoles, and streaming devices. With support for 4K pass-through, it ensures that users can enjoy ultra-high-definition content without sacrificing image quality. Additionally, the receiver features an advanced HDMI switching capability, enabling users to easily switch between different sources with just a single remote control.

Another significant characteristic of the Pioneer VSX-21 is its powerful amplification. With a significant output power, it can drive a wide variety of speakers, delivering rich sound even at high volumes. The receiver's Class D3 amplification technology further optimizes power efficiency, reducing energy consumption while maintaining impressive audio performance.

The VSX-21 also incorporates advanced audio calibration technology, such as Pioneer’s MCACC (Multi-Channel Acoustic Calibration System). This system automatically adjusts the audio settings based on the room’s acoustics, ensuring optimal sound quality regardless of the space in which the receiver is placed.

The user interface of the VSX-21 is intuitive, featuring an easy-to-navigate menu system that allows users to customize their audio and video settings. The front panel is well-designed, featuring direct access buttons and a large display that simplifies operation.

In summary, the Pioneer VSX-21 stands out in the crowded AV receiver market with its combination of advanced audio technologies, versatile connectivity options, and smart features such as audio calibration. It is a compelling choice for anyone looking to create an exceptional home theater system or simply elevate their music listening experience. With its ability to deliver cinematic sound and visual brilliance, the VSX-21 remains a reliable and high-performing component in any modern entertainment setup.
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