TDA7505 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TDA7505' PDF : 38 Pages View PDF
TDA7505
Software features
6.7
Other
● Voice compression/decompression for traffic information storage
● Echo and noise canceling for mobile phone connection
6.8
Functional modes
The SW defines the whole functionality of the device, except RDS. Although ST is able to
provide a complete set of SW, the customer may implement his own SW or may use third
party SW. This allows a flexible adaptation to the application needs.
The concept allows the parallel processing of two independent audio sources. For example
one source may go through the loudspeakers, whereas another source may feed a
headphone. Additionally other sources like a phone or a navigation system may be mixed to
the audio source. In case the 150 MIPS available are not sufficient, a co-dsp (e.g.:
TDA7502) may be connected through the serial audio interface (SAI). Finally the device may
be embedded into an audio bus system (e.g.: MOST).
Following table shows an example of possible modes:
Table 29. Example of possible modes
Source
Comment
AM/FM mode
CD mode
(digital)
AM/FM MPX
(analog)
DSP1
Main source
and RDS
Alternative
Rear Source
and RDS
CD changer
(analog)
DSP1
Alternative Alternative
Rear Source Rear Source
CD Changer Tape mode
mode (analog) (digital)
Alternative Alternative
Rear Source Rear Source
and RDS
and RDS
Main source
Alternative
Rear Source
Traffic info
play mode
Alternative
Rear Source
and RDS
Alternative
Rear Source
Phone/Navi
(analog)
DSP0
Summed to Summed to Summed to Summed to Summed to
Main source Main source Main source Main source Main source
CD/CD ROM
audio/MP3
(digital SPDIF)
DSP1
Alternative
Rear Source
through SRC
Main source
through SRC
Alternative
Rear Source
through SRC
Alternative
Rear Source
through SRC
Alternative
Rear Source
through SRC
Tape via ADC
(digital SAI)
Dolby B on
DSP1
Alternative
Rear Source
DSP co-processor MDSP: master Available (1)
CO-dsp: slave
Traffic info
storage
DSP0
Background
recording
MOST bus
MDSP: slave
Co-dsp: slave Available(1)
MOST: master
Alternative
Rear Source
Available(1)
Background
recording
Available(1)
Alternative
Rear Source
Main source
Available(1) Available(1)
Background Background
recording
recording
Available(1) Available(1)
Alternative
Rear Source
Available(1)
Main source
& Background
recording
Available(1)
1. The total number of SAI channels is six. They must be split between MOST, Co-DSP and the external ADC for tape. In case
of MOST, the DSP clock must be synchronized to the MOST bus.
Note:
The main source (blue) may run in parallel with one of the alternative rear sources (yellow).
Phone/Navi, DSP Co-processor, traffic info storage and MOST (green) are available in
parallel to all modes.
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