Dolby TrueHD ensures A/V systems are compatible with next-generation players

Make sure your A/V system is compatible with next-generation HD disc players <br> The next generation of high-definition (HD) disc players will be different in many ways from today's standard definition DVD-Video players. But whether you have an A/V system with early Dolby Digital technology or an updated A/V receiver with HDMITM interface or external linear multi-channel input, you can rest assured that we have compatibility. Good, high quality sound. Dolby has taken into account your equipment.

Next generation CD player

With the advancement of coding systems, the expansion of optical disc capacity, and the commercialization of blue laser technology, the next-generation optical disc format will bring high-definition image quality. New audio codecs, including Dolby Digital Plus and Dolby TrueHD, also bring high-definition sound to the entertainment experience.

The next generation of disc formats will bring a new level of audio interaction to the playback experience. For example, home theater enthusiasts can listen to high-definition images while listening to the audio tracks produced on the disc, which is also mixed with the director's commentary streaming from the studio's website. As you choose different features or programs with the remote control, you will experience the unique sound created by the player.

The most viable way for next-generation CD players to implement these new interactive features is to handle all the relevant audio elements in the player. The video on the DVD also uses the same mode: after the main video is decoded, the subtitles or menus are added, and then output into a complete image, which can be analog (composite, component) or digital (DVI, HDMI) baseband signals.

In a high definition (HD) disc player, audio is processed in the same way. Audio tracks decoded from the disc, as well as audio elements that are streamed or downloaded from the Internet or generated internally by the player, are decoded as digital PCM signals in the player. PCM is the format used by the player to perform all internal audio processing operations, including mixing. During the mixing phase, the commentary in the form of streaming media, the sound of the buttons, and other non-disc sounds will be mixed with the original 5.1 or 7.1 tracks on the disc to fully implement the sounds carefully designed by the producer.

This decoding method in the player has important meaning.

This type of decoding in the player has important implications. Even after the disc has been sold for a long time, new features can be created for a particular movie. More importantly, since the mix is ​​performed inside the player, there is no need to output the original audio stream from the player like DVD-Video in the future. Therefore, consumers can no longer assume that each player works in concert with each A/V receiver.

There are two methods for replaying high-definition audio tracks of the next-generation optical disc format through an A/V receiver or an audio processor.

More and more A/V processors and receivers are equipped with IEEE1394 (FireWire®) or HDMI interfaces that can transmit up to 8 channels of 24-bit/96kHz PCM audio. If your A/V receiver has this type of next-generation interface, you should look for a next-generation optical media player with a similar interface. With this connection, the mixed PCM signal is transmitted from the HD player to the A/V receiver, which makes digital signal processing and bass management easy.

Multichannel analog interface

The next generation of compact disc players can also include a linear audio output - a multi-channel mixed PCM signal that is passed through a digital to analog converter. The emergence of SACD and DVD-Audio in recent years has led to the addition of 5.1 or even 7.1 external input interfaces to many A/V receivers. If your A/V receiver has a 5.1 or 7.1 external audio input, you can select an A/V receiver with a 5.1 or 7.1 external audio input for full-band reverberation of the audio signal from the HD player.

Connected via a multi-channel analog input interface

Connecting any of these interfaces allows you to experience the full potential of the high-definition audio provided by the next-generation disc format.

S/PDIF Interface <br> If your A/V receiver or processor has neither multi-channel analog nor digital input, but with 5.1-channel Dolby Digital decoding and reverberation capabilities, you can still enjoy the following The 5.1 channel sound of a generation CD player. Included in the 7.1-channel Dolby Digital Plus and Dolby TrueHD streams is the core 5.1 mix program prepared by the program producer, which is used when the player is set to 5.1 channel mode. When the audio signal is mixed in the player, the PCM signal can be encoded into a Dolby Digital signal and output from the player to the Dolby Digital A/V receiver or processor via the S/PDIF (fiber or coaxial) interface. .

In many cases, the sound quality you experience with this connection is better than the sound quality experienced when playing standard definition DVD-Video discs, especially when the original signal on the disc is Dolby TrueHD or high bit rate Dolby. This is especially true for digital enhanced signals. This is because a higher quality source signal is input to the Dolby Digital encoder at a code rate of 640 kbps, which is higher than the highest bit rate of a DVD-Video disc.

Multichannel analog interface

Because Dolby Digital encoding is not standard on HD players, you need to find a next-generation player with an S/PDIF output and built-in Dolby Digital 5.1-channel encoding.

Dolby TrueHD and Dolby Digital Plus Technology for A/V Receivers

The final A/V receiver will process the Dolby Digital Plus or Dolby TrueHD streams directly. We are working with IEC and HDMI organizations to update data protocols to enable future high-bandwidth interfaces to carry these streams.

In order to decode these streams, the A/V decoder needs to support the updated data protocol and integrate these new decoding algorithms. In addition, a high-definition optical disc is selected: the program producer allows the core 5.1 or 7.1 audio stream in the disc to be passed directly to the player's digital output port bypassing the player's mixing process. We expect that certain HD discs will allow this, but they only represent a small portion of the movie. The final sound quality will essentially be the same as the audio decoded as a PCM signal in the player and then transmitted to the A/V receiver via the current HDMI interface.

The post-digital signal processing (DSP) requirements for A/V receivers have more than doubled due to the processing of six- or eight-channel code rates of 24-bit/96 kHz with the new HD format. Instead of using a large amount of DSP resources inside the A/V receiver to decode the core audio signal, it is better to use the DSP resources of the A/V receiver to perform high-definition post processing, such as bass management, room or speaker equalization, More than directional logic IIx decoding or other types of digital signal processing.

Multichannel analog interface

Thanks to the new digital interface providing good sound quality and many features, hardware manufacturers can offer more highly optimized system designs for optimal sound while maximizing flexibility and efficiency for consumers. Figure 5: Connection via the next-generation HDMI interface Figure 4: Connection via S/PDIF interface Figure 2: Connection via HDMI interface Figure 1: Next-generation six-channel CD player with Dolby Digital Output Decoder

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