Sound Processing; Analogue Sound If - Input Section; Quadrature Mixers; Phase And Am Discrimination - Daewoo DTK-28 Service Manual

Chassis : cp-850/f
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CP-850/F Service Manual
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5.6 SOUND PROCESSING

5.6.1 ANALOGUE SOUND IF - INPUT SECTION

The input pins ANA_IN1+ and ANA_IN- offer the possibility to connect sound IF sources to the MSP 341xG. The
analogue-to-digital conversion of the preselected sound IF signal is done by an A/D converter, whose output is used to
control an analogue automatic gain circuit (AGC), providing an optimal level for a wide range of input levels.

5.6.2 QUADRATURE MIXERS

The digital input coming from the integrated A/D converter may contain audio information at a frequency range of
theoretically 0 to 9 MHz corresponding to the selected standards. By means of two programmable quadrature mixers,
two different audio sources ; for example, NICAM and FM-mono, may be shifted into baseband position.

5.6.3 PHASE AND AM DISCRIMINATION

The filtered sound IF signals are demodulated by means of the phase and amplitude discriminator block. On the output,
the phase and amplitude is available for further processing.
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