Chapter 1 - Features and Circuit Descriptions
CTV-41 13
Audio Processing
Figure 1-7 illustrates the overall block diagram for the audio processing.
All of this is accomplished on the BU1 board.
Analog Audio
All analog audio sources are switched by the Audio DSP IC2002. The L/R
audio signals are A/D converted within IC2002 for processing by DSP
and exit as analog L/R to IC2009. The analog L/R audio is converted
to PWM by IC2009 and amplified by the class-D amplifier within the IC.
All selected analog sources are output in SPDIF format for the optical
out transmitter. Analog L/R outputs are also provided for the audio output
jacks on the rear of the unit and the headphone jack on the front input U1
board. On the 32” XBR series the front input board is the U2 board.
Digital Audio
Digital audio sources are available via the HDMI inputs or digital channels
received by the tuner. HDMI audio is extracted by Trident IC4500 and sent
to the ATI Micro. Digital audio from the tuner is sent directly to ATI. The
audio information is then sent to Audio DSP IC2002 in digital format. At
this point audio process is the same as analog signals.
Optical Out
The optical output jack at the rear of the unit will pass all selected audio
sources except for Super Audio CD (SACD) or DVD audio sources
hooked up to the HDMI inputs (for obvious copyright protection reasons).
All analog sources (including that from the NTSC tuner) are output as
2-channel 48KHZ PCM. DVD players hooked up to the HDMI inputs will
output 2-channel PCM regardless of what the HDMI audio output on
the DVD player is set to. The internal speakers will output DVD audio
regardless of what the HDMI audio of the DVD player is set to (unlike
previous year’s models).
If an ATSC compliant digital channel is received by cable TV (QAM) or
terrestrial (8VSB) and a Digital Dolby® audio signal is embedded in the
content, the optical out will pass this signal for use with a surround-sound
amplifier that is compatible with Digital Dolby® 5.1 standards. Table 3-1
offers an overall view of what is output from the optical jack based on input
selection.
AUDIO SOURCE OPTICAL OUTPUT
DIGITAL TUNER 5.1 5.1 OR 2CH PCM
DVD HDMI 5.1 2CH PCM
ALL ANALOG AUDIO INPUTS 2CH PCM
NTSC TUNER 2CH PCM
SACD VIA HDMI NO OUTPUT
DVD AUDIO VIA HDMI NO OUTPUT
TABLE 3-1
OPTICAL OUTPUT TRUTH TABLE
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