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User manual for MERUS™ audio amplifier configurator
MA2304DNS/MA2304PNS
DSP flows
There are three categories of DSP flows to select from, based on sample rate:
32, 44.1 and 48 kHz
•
88.2 and 96 kHz
•
176.4 and 192 kHz
•
The higher the sample rate category, the higher the bandwidth, but fewer instructions per sample are available
for DSP processing.
Detailed information about each audio block is provided in Chapter 5.
4.1
DSP flow application examples
This section goes through various application examples on how to configure, use and tune the blocks of a DSP
flow. As mentioned previously, detailed information about each audio block is provided in Chapter 5.
A note on audio tuning
Detailed information on the limiters is available in Section 5.2. There is some tuning needed to keep the limiter
effect as transparent as possible, while meeting the speaker power requirements. The peak limiter attack time
can be set to 0 ms for a brickwall effect. However, the release time should be set long enough to prevent
audible distortion caused by bass frequencies modulating. For smaller speakers, a biquad configured as a high-
pass filter is recommended to allow more flexibility with release times.
EQing is highly dependent on the speaker enclosure and configuration. For small, single-driver speakers, EQing
is mostly focused on flattening and/or matching a target response, improving bass and voice intelligibility, and
solving some acoustic/driver resonance issues. The biquads can also be used to implement crossovers for two-
and three-way speaker systems.
4.1.1
5 W mono wireless speaker
This hypothetical product has the following audio requirements:
The incoming stereo signal shall be mixed to mono.
1.
Continuous output power shall be limited to 5 W average power.
2.
Peak power shall not exceed the peak short-term power handling.
3.
Power supply voltage level shall be at or above the peak power.
4.
The loudspeaker specifications are as follows:
Table 3
Loudspeaker specifications
Parameter
Parameter
P
Speaker continuous power handling
1
P
Speaker short-term power handling
2
Z
Speaker nominal impedance
nom
Requirement 1: stereo mixing
This requirement is straightforward. As explained in Section 5.5, left and right input channels can be mixed
using the MIXMUX block. Output 0 can be configured as an input mix of the stereo input, as shown below:
User Manual
26
Value
Unit
5
W
20
W
4
Ω
V 1.1
2022-09-12
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