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CLASSIFICATION
PRODUCT SPECIFICATION
No.
DS-13xx-2400-102
REV.
4.8
SUBJECT
CLASS 1 or 2 BLUETOOTH MODULE
PAGE
22 of 60
PANASONIC’S CODE
See Chapter Ordering Information
DATE
23.09.2015
PANASONIC INDUSTRIAL DEVICES EUROPE GMBH
www.pideu.panasonic.de
11.7 IMPROVED ALGORITHM FOR LOST PACKETS
The CC256X features an improved algorithm for improving voice quality when received
voice data packets are lost. There are two options:
• Repeat the last sample – possible only for sample sizes up to 24 bits. For sample
sizes >24 bits, the last byte is repeated.
• Repeat a configurable sample of 8 to 24 bits (depends on the real sample size), in
order to simulate silence (or anything else) in the PCM bus. The configured sample will
be written in a specific register for each channel.
The choice between those two options is configurable separately for each channel.
11.8 BLUETOOTH/PCM CLOCK MISMATCH HANDLING
In Bluetooth RX, the CC256X receives RF voice packets and writes these to the codec
I/F. If the CC256X receives data faster than the codec I/F output allows, an overflow will
occur. In this case, the Bluetooth has two possible behaviour modes: ‘allow overflow’
and ‘don’t allow overflow’.
• If overflow is allowed, the Bluetooth will continue receiving data and will overwrite any
data not yet sent to the codec.
• If overflow is not allowed, RF voice packets received when buffer is full will be
discarded.
11.9 BLUETOOTH INTER-IC SOUND (I2S)
The CC256X can be configured as an Inter-IC Sound (I2S) serial interface to an I2S
codec device. In this mode, the CC256X audio codec interface is configured as a bi-
directional, full-duplex interface, with two time slots per frame: Time slot 0 is used for the
left channel audio data and time slot 1 for the right channel audio data. Each time slot is
configurable up to 40 serial clock cycles in length and the frame is configurable up to 80
serial clock cycles in length.
Do not connect the the microcontroller/DSP directly to the module’s PCM interface, a
simple RC low pass filter is recommended to improve noise suppression.