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Space diversity receivers

  • US 5,410,748 A
  • Filed: 05/28/1992
  • Issued: 04/25/1995
  • Est. Priority Date: 06/04/1991
  • Status: Expired due to Term
First Claim
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1. A space diversity receiver for receiving broadcast signals comprising:

  • a plurality of antenna connectors, each of which is to be connected to an antenna,signal selecting means connected to the antenna connectors for selecting a signal from among separate signals obtained from each of the antenna connectors,signal processing circuit means supplied with each signal from the antenna connectors selected by the signal selecting means and operative to produce an output signal based on each signal selected by the signal selecting means, timing signals, and at least one detection output signal indicative of a selected characteristic of each signal selected by the signal selecting means,signal sampling control means supplied with the timing signals and the one detection output signal and operative to cause the signal selecting means to perform a signal sampling operation through which the signals obtained respectively from the antenna connectors are selectively sampled during a predetermined specific period of recurring, predetermined short periods and supplied to the signal processing circuit means,antenna connector selecting means connected to the signal processing circuit means and supplied with the output signal for comparing with one another in quality output signals of the signal processing circuit means successively obtained based on signals sampled through the signal sampling operation performed by the signal selecting means and generating a comparison output signal indicative of one of the antenna connectors through which a signal giving rise to the best output signal of the signal processing circuit means is introduced during said predetermined specific period, andsignal selecting control means connected to control the signal selecting means and supplied with the comparison output signal from the antenna connector selecting means for causing the signal selecting means to select the signal introduced through the antenna connector selected by the antenna connector selecting means during a period successive to said predetermined specific period,wherein the signal sampling control means is further operative to elongate an interval between said predetermined specific periods so that a frequency of signal sampling operations in the signal selecting means is reduced in response to an increase in stability of the signal selected to be supplied to the signal processing circuit means during said period successive to said predetermined specific period and to stop the signal sampling operation when the signal selected to be supplied to the signal processing circuit block during said period successive to said predetermined specific period is sufficiently stabilized.

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