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MSP3411G Datasheet(PDF) 13 Page - Micronas |
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MSP3411G Datasheet(HTML) 13 Page - Micronas |
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13 / 102 page  PRELIMINARY DATA SHEET MSP 34x1G MICRONAS INTERMETALL 13 2.4. Source Selection and Output Channel Matrix The Source Selector makes it possible to distribute all source signals (one of the demodulator source chan- nels, SCART, or I2S input) to the desired output chan- nels (loudspeaker, headphone, etc.). All input and out- put signals can be processed simultaneously. Each source channel is identified by a unique source address. For each output channel, the sound mode can be set to sound A, sound B, stereo, or mono by means of the output channel matrix. If Automatic Sound Select is on, the output channel matrix can stay fixed to stereo (transparent) for demodulated signals. 2.5. Audio Baseband Processing 2.5.1. Automatic Volume Correction (AVC) Different sound sources (e.g. terrestrial channels, SAT channels, or SCART) fairly often do not have the same volume level. Advertisements during movies usually have a higher volume level than the movie itself. This results in annoying volume changes. The Automatic Volume Correction (AVC) solves this problem by equalizing the volume level. To prevent clipping, the AVC’s gain decreases quickly in dynamic boost conditions. To suppress oscillation effects, the gain increases rather slowly for low level inputs. The decay time is programmable by means of the AVC register (see page 34). For input signals ranging from −24 dBr to 0 dBr, the AVC maintains a fixed output level of −18 dBr. Fig. 2–4 shows the AVC output level versus its input level. For prescale and volume registers set to 0 dB, a level of 0 dBr corresponds to full scale input/output. This is – SCART input/output 0 dBr = 2.0 Vrms – Loudspeaker and Aux output 0 dBr = 1.4 Vrms Fig. 2–4: Simplified AVC characteristics 2.5.2. Loudspeaker and Headphone Outputs The following baseband features are implemented in the loudspeaker and headphone output channels: bass/treble, loudness, balance, and volume. A square wave beeper can be added to the loudspeaker and headphone channel. The loudspeaker channel addi- tionally performs: equalizer (not simultaneously with bass/treble), spatial effects, and a subwoofer cross- over filter. 2.5.3. Subwoofer Output The subwoofer signal is created by combining the left and right channels directly behind the loudness block using the formula (L+R)/2. Due to the division by 2, the D/A converter will not be overloaded, even with full scale input signals. The subwoofer signal is filtered by a third-order low-pass with programmable corner fre- quency followed by a level adjustment. At the loud- speaker channels, a complementary high-pass filter can be switched on. Subwoofer and loudspeaker out- put use the same volume (Loudspeaker Volume Reg- ister). 2.5.4. Quasi-Peak Detector The quasi-peak readout register can be used to read out the quasi-peak level of any input source. The fea- ture is based on following filter time constants: attack time: 1.3 ms decay time: 37 ms −30 −24 −18 −12 −6 +6 input level −18 −24 −12 output level 0 [dBr] [dBr] |
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