Symphony SoundBite Demo User’s Guide
Freescale Semiconductor
3
Chapter 1
About Symphony SoundBite
1.1 Hardware
Features
Built around a single DSPB56371 device, the Symphony SoundBite is an inexpensive, feature-packed solution for audio
digital signal processing.
•
The Symphony SoundBite supports the simultaneous input and output of 8 channels of analog audio (or 6 channels
of analog with digital stereo optical S/DIF) through the eight 3.5 mm stereo jacks on the board. Sample rates of up
to 192 kHz are supported with the four 24-bit stereo codecs provided on the board.
•
A serial I
2
C EEPROM provides non-volatile storage for the DSP, as well as allowing the board to operate in a
stand-alone configuration (the DSP application code can be stored in the EEPROM).
•
An 8-position DIP switch and 9 LEDs are connected to GPIO pins on the DSP and are available for user
interaction and indications. An expansion header is provided to facilitate off-board expansion.
•
An on-board USB interface provides low-level JTAG/OnCE debugging capability. The USB interface also
provides high-level SPI and I
2
C communication via the DSP’s SHI port. The board can be powered via the USB
jack, but optimum audio performance requires the use of an external power supply.
•
The analog inputs and outputs are considered to be line-level. Since two different types of codecs are used, there is
a slight difference in the full-scale maximum input and output voltages between them. Please refer to the data
sheets for the AKM codecs AK4556 and AK4584 for more information.
NOTE: Although headphones may be plugged into the output jacks and sound may be heard in them, there is no
headphone amplifier built into the codecs nor is one provided on the Symphony board. Clipping will occur at higher output
levels due to the load headphones present to the codec outputs. An external amplifier should be employed when using
headphones.
1.2
Symphony SoundBite Board Layout
Figure 1-1 shows the Symphony SoundBite board.