UPC1876 datasheet(13/40 Pages) NEC

13 / 40 page

µPC1876

Data Sheet S11666EJ4V0DS00

FUNCTION OF EACH BLOCK

In the US, TV audio signals are broadcast in FM modulation. The stereo (L–R), Sub Audio Program (SAP) and

telemetry signals are multiplexed in a higher frequency band than the monaural (L+R) signal (50 Hz to 15 kHz).

The US MTS system base-band spectrum is described before:

Figure 2-1. US MTS System Base-Band Spectrum

(15.734 kHz)

2 fH

3 fH

4 fH

5 fH

6 fH

6.5 fH

Modulation frequency (Hz)

Stereo pilot

signal

Monaural

signal (L+R)

Stereo signal (L–R)

Sub Audio Program (SAP) signal

Telemetry

signal

Table 2-1. US MTS System Base-Band Spectrum

Signal frequency band

Signal processing system

Maximum audio

carrier deviation (kHz)

Monaural signal (L+R)

50 Hz to 15 kHz

Stereo pilot signal

15.734 kHz

Only stereo broadcasting

Stereo signal (L–R)

50 Hz to 15 kHz

AM modulation (carrier frequency 2 fH),

dbx noise reduction processing

Sub Audio Program (SAP)

50 Hz to 10 kHz

FM modulation (carrier frequency 5 fH,15

signal

maximum frequency deviation 10 kHz)

dbx noise reduction processing

Telemetry

Audio

0 to 3.4 kHz

FM modulation (carrier frequency 6.5 fH,3

signal

Data

0 to 1.5 kHz

maximum frequency deviation 3 kHz)

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