| 摘要 |
In a homodyne receiver for the reception of a carrier frequency signal modulated with a low-frequency signal, the sensitivity of the detection of the low-frequency signal is enhanced by two auxiliary modulations before the conversion into the base band. The auxiliary signal utilized for an auxiliary modulation of the local oscillator signal and the supplemental signal employed for an auxiliary modulation of the carrier frequency signal comprise frequencies that can be technologically governed and with economic outlay and enable the simple decoupling of the low-frequency signal from the supplemental signal and, thus, an enhancement of the sensitivity of the homodyne receiver. The decoupling is particularly achieved by a band-pass filtering after the conversion of the carrier frequency signal into the base band, this band-pass filtering being tuned to a specific frequency relationship of the auxiliary signal and the supplemental signal. An advantage of the homodyne receiver is of particular economic significance for employment in mass-produced articles, such as in mobile and wireless communication systems.
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