Techno Tidbits & Problem-solving

Dolby Digital

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Dolby Digital is a compression format which records the sound of 6 or 8 channels of the theater surround system (Dolby Digital) on the movie film digital track. Of the 6-8 channels, the sub woofer channel is intended for bass only, and because the frequency range is smaller than a main channel, the overall soundtrack is expressed as 5.1 or 7.1 channels. 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 sound

surround track

track (Matrix)

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

Dolby Digital

sound

sound

(Monaural)

 

 

Digital

 

Video

 

 

sound

 

 

 

 

 

2

4

6

8

10

12

14 MHz

Dolby

 

 

 

 

 

Frequency

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, Dolby Digital is used to compress the data.

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

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 subwoofer channel is also called Low Frequency Effect (LFE). The subwoofer channel can be used as desired to enjoy strong bass sounds.

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Pioneer VSX-39TX manual Techno Tidbits & Problem-solving, Dolby Digital, Laser disc format
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VSX-39TX specifications

The Pioneer VSX-39TX is a high-performance audio/video receiver that exemplifies the brand's commitment to delivering superior sound quality and advanced technology. Released as part of Pioneer's flagship series, the VSX-39TX is designed for audiophiles and home theater enthusiasts seeking an immersive entertainment experience.

One of the standout features of the VSX-39TX is its robust amplification system. It boasts a 7.1-channel configuration that delivers powerful and clear audio across multiple channels. With a total power output of 110 watts per channel, this receiver is capable of driving a wide range of speakers, ensuring an engaging listening experience whether you're enjoying music or diving into a cinematic film.

The VSX-39TX also supports various audio formats, including Dolby Digital EX, DTS-ES, and the latest Dolby TrueHD and DTS-HD Master Audio. This extensive surround sound support allows for a truly immersive audio experience. The receiver’s advanced audio processing technology helps in accurately decoding these formats, ensuring that the sound is not only powerful but also precise and detailed.

Another significant aspect of the Pioneer VSX-39TX is its video capabilities. The receiver features multiple HDMI inputs, supporting 1080p video resolution and providing a complete connection solution for high-definition devices. Its integrated video upscaling feature enhances lower resolution content, allowing users to enjoy their entire media library at the highest quality possible.

The VSX-39TX also emphasizes flexibility with its extensive connectivity options. In addition to HDMI, it includes composite and component video inputs, making it compatible with a variety of source devices. Furthermore, the receiver features a built-in AM/FM tuner and is equipped with a direct-access port for digital audio input, providing versatility for users.

To enhance user experience, the VSX-39TX comes with a well-designed remote control and an intuitive on-screen display, allowing for easy navigation through the setup process and adjustment of settings. The receiver also supports Pioneer's Multi-Room function, enabling audio playback in different zones of the home.

In summary, the Pioneer VSX-39TX stands out with its combination of powerful amplification, extensive surround sound support, and versatile connectivity options. Its commitment to delivering high-quality audio and video makes it a formidable choice for anyone looking to elevate their home entertainment system. Whether you are listening to music or watching movies, the VSX-39TX is built to provide a captivating audio-visual experience.
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