BCM4330 Preliminary Data Sheet
On-Chip MP3 Encoding
Figure 23: Example Soft Mute Characteristic
• Audio Pause Detect—The FM receiver monitors the magnitude of the audio signal and notifies the host
through an interrupt when the magnitude of the signal has fallen below the threshold set for a
programmable period. This feature can be used to provide alternate frequency jumps during periods of
silence to minimize disturbances to the listener. Filtering techniques are used within the audio pause
detection block to provide more robust presence-to-silence detection and silence-to-presence detection.
On-Chip MP3 Encoding
In this mode of operation, the device can record the FM audio to MP3, then output the MP3 data over the HCI
interface. The feature effectively off loads the MP3 recording processing load from the host and assists in FM
time shift applications. This feature can also be used in conjunction with burst mode buffering to provide
significant FM system record times.
®
BROADCOM
BCM4330 Preliminary Data Sheet
April 28, 2011 • 4330-DS304-RI
Page 70
CYPRESS [ CYPRESS ]
