TVRD receiver system with automatic bandwidth adjustment

Details TVRD receiver system with automatic bandwidth adjustment TVRD receiver system with automatic bandwidth adjustment

1985-10-30

1988-12-20

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455339, 455340, H03J 116

Patent

active

047929936

ABSTRACT:
An improved TVRO receiver for receiving signals broadcast over a plurality of channels with varying bandwidths and having a tuner producing output signals corresponding to the received signals and having bandwidths which vary from channel to channel is provided with a band pass filtering arrangement receiving the output signals and having a controllably adjustable pass band, a bandwidth detection circuit for receiving the output signals passing through the filtering arrangement and being responsive to a current output signal corresponding to the channel being received for producing a control signal indicative of the extent of deviation of the bandwidth of the current output signal beyond the current pass band of the filtering arrangement, and a control circuit responsive to the control signal for adjusting the pass band of the filtering arrangement to accommodate the bandwidth of the current output signal corresponding to the channel being received, if the bandwidth deviation of the current output signal exceeds a predetermined threshold value.

REFERENCES:
patent: 3218641 (1965-11-01), Maynard
patent: 4124817 (1978-11-01), Takahashi
patent: 4352208 (1982-09-01), Schroeder
patent: 4356567 (1982-10-01), Eguchi et al.
patent: 4356568 (1982-10-01), Ogita et al.
patent: 4419768 (1983-12-01), Yamashita et al.
patent: 4458207 (1984-07-01), Favreau et al.
patent: 4551755 (1985-11-01), Matsuda et al.
patent: 4563651 (1986-01-01), Ohta et al.

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