Broadcasting Services (Technical Planning) Guidelines 2007
Program signal characteristicsProgram signal characteristics
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Program signal characteristics
Monophonic transmission
- The signal shall be double sideband amplitude modulated. The modulation depth is not to exceed 125 per cent for positive modulation and 100 per cent for negative modulation.
The instantaneous amplitude of the modulated carrier shall satisfy the expression:
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where
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Stereophonic transmission
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The compatible quadrature amplitude modulation (C‑QUAM) system shall be employed for the transmission of stereophonic signals.
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The radiated signal shall consist of a carrier, amplitude modulated by the monophonic sum signal (L+R) and phase modulated by the stereophonic difference signal (LR). The pilot signal must be included in stereo transmissions.
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Amplitude modulation depth shall not exceed 125 per cent for positive modulation and 100 per cent for negative modulation.
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Phase modulation shall not exceed 1.26 radians including the pilot signal.
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The instantaneous amplitude of the modulated carrier shall satisfy the expression:
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where
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and
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where
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Note In the presence of modulation processing, the gamut of M and S signals must be constrained. The magnitude of the S signal must be limited in the presence of high negative amplitude modulation. See guideline 18 ‘Gamut of Sum and Difference Modulation’. This limiting is normally implemented in the C‑QUAM modulator.