Sony DAV-LF1 User Manual

Section of a music piece or an image on a data 
CD containing MP3 audio tracks or JPEG files.

Subdivision of a title on a DVD. A title is 
composed of several chapters.

This is the generic name of the surround sound 
produced by digital signal processing 
technology developed by Sony. Unlike previous 
surround sound fields mainly directed at the 
reproduction of music, Digital Cinema Sound is 
designed specifically for the enjoyment of 
movies.

Recent times have been witness to the rapid 
spread of DVDs, Digital Broadcasting Satellite 
Receiver and other high-quality media. In order 
to ensure that the subtle nuances endowed by 
these high-quality media would be transmitted 
with no accompanying deterioration, Sony 
developed a technology called “Digital Infrared 
Audio Transmission” for the infrared 
transmission of digital audio signals using no 
compression, and it introduced it into the DAV-
LF1.
This technology transfers digital audio signals 
using no compression inside the subcarrier 
frequency band allocated by the IEC 
(International Electronic Committee) and 
JEITA (Japan Electronics and Information 
Technology Industries Association) for hi-fi 
audio transmission applications. (See Fig. 1)

This movie theater sound format is more 
advanced than Dolby Surround Pro Logic. In 
this format, the surround speakers output stereo 
sound with an expanded frequency range, and a 
subwoofer channel for deep bass is 
independently provided. This format is also 
called “5.1,” with the subwoofer channel 
designated as the 0.1 channel (since it functions 
only when a deep bass effect is needed). All six 
channels in this format are recorded separately 
for superior channel separation. Furthermore, 
since all the signals are processed digitally, less 
signal degradation occurs.

An enhanced compatible format of Dolby 
Digital 5.1, developed by Dolby Laboratories 
and Lucasfilm THX, which can be used for 
6.1(three surround speakers) channel playback, 
using matrix encoding.

Dolby Pro Logic II creates five full-bandwidth 
output channels from two-channel sources. This 
is done using an advanced, high-purity matrix 
surround decoder that extracts the spatial 
properties of the original recording without 
adding any new sounds or tonal colorations.

x Movie mode

The Movie mode is for use with stereo television 
shows and all programs encoded in Dolby 
Surround. The result is enhanced sound field 
directionality that approaches the quality of 
discrete 5.1-channel sound.

x Music mode

The Music mode is for use with any stereo music 
recordings, and provides a wide and deep sound 
space.

As one method of decoding Dolby Surround, 
Dolby Surround Pro Logic produces four 
channels from two-channel sound. Compared 
with the former Dolby Surround system, Dolby 
Surround Pro Logic reproduces left-to-right 
panning more naturally and localizes sounds 
more precisely. To take full advantage of Dolby 
Surround Pro Logic, you should have one pair of 
surround speakers and a center speaker. The 
surround speakers output monaural sound.

L

R

5

4

3

2

6

[MHz]

Analog 
transmission

Digital transmission (Digital 
infrared Audio Transmission)

Fig. 1 Signal spectrum for digital infrared audio 
transmission