Audio Muting - Analog Devices Advantiv ADV7604 Hardware Manual

MUX_HBR_OUT , HDMI Map, Address 0x01, [1]
Function
MUX_HBR_OUT
0
1

7.16.10 Audio Muting

The ADV7604 integrates an advanced audio mute function that is designed to remove all extraneous
noise and pops from a 2-channel L-PCM audio stream at sample frequencies up to 48 kHz.
The hardware for audio mute function is composed of the following three blocks:
• Audio delay line that delays channels 1 and 2 by 512 stereo samples.
• Audio mute controller takes in event detection signals that can be used to determine when an
audio mute is needed. The controller generates a mute signal to the ramped audio block and a
coast signal to the digital PLL generating the audio clock.
• Ramped audio mute block that can mute the audio over the course of 512 stereo samples.
Notes:
• The ADV7604 mutes only the non compressed data from the audio sample packets output
2
through the I
• The audio delay line is automatically bypassed when the ADV7604 receives multichannel
audio or when it receives the following audio packets:
DSD packets
HBR packets
• The ramped audio mute block is always bypassed when the part received compressed audio
or when it received the following audio packets:
DSD packets
HBR packets
Rev. F August 2010
Description
ADV7604 outputs I
when it receives HBR packets. OVR_MUX_HBR must be set to 1 for
MUX_HBR_OUT to be effective.
ADV7604 outputs SPDIF streams when it receives HRB packets. OVR_
MUX_HBR must be set to 1 for MUX_HBR_OUT to be effective.
S and the SPDIF interface.
2
S or AES3 streams according to I2SOUTMODE
144
ADV7604