Radio receiver
AssigneeNissan Motor Co., Ltd.
InventorYasushi Kawakami
Life of this patent
Estimating the term…
Abstract
In a radio receiver provided with an automatic tuning circuit, a tuning sensitivity adjusting circuit comprises a buffer which extracts a signal received partially-processed from the radio circuit without substantially affecting the audio output, and a change-over circuit which receives the signal from the extracting means, selectively attenuates the signal, and supplies the signal to the automatic tuning circuit as a signal to lock the tuning circuit to a desired frequency.
Claims2
In a radio receiver provided with an automatic tuning circuit for locking the radio receiver onto the frequency of a received signal, a tuning sensitivity adjusting circuit comprising:
- means for extracting a partially-processed received signal from the radio receiver without substantially affecting the output of the radio receiver;
- a gain selecting change-over circuit, responsive to the partially-processed signal from said extracting means, for selectably amplifying the partially-processed signal at a selected first one of a plurality of gain levels, and for outputting the selectably amplified signal to the automatic tuning circuit as a station-locking signal;
- and
- a time-delay circuit provided in the change-over circuit for delaying for a predetermined time application of a selectably amplified signal at a selected second gain level as said station locking signal in response to said changeover circuit selecting said second gain level.
Dependencies are inferred from the claim text.