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Universal automotive electronic radio with display for tuning or time information
| Details |
Inventors: Parmet, Bernard S.;
Assignee: Motorola, Inc. (Schaumburg, IL)
Primary Examiner: Bookbinder; Marc E.
Assistant Examiner:
Attorney, Agent or Firm: Melamed; Phillip H., Gillman; James W., Lisa; Donald J.
Selected radio circuits are fabricated on modules which plug into a "mother" board located in the radio chassis. The circuitry includes a plurality of RF front ends (including at least one AM and one FM front end), each tunable over a selected radio band by tuner circuitry. The AM front end includes a saturable core reactor whose tuning inductance varies as a function of the tuning current provided to it by a voltage-to-current converter in the tuner. Both AM and FM signals are translated by a frequency synthesizer to a common IF frequency, namely 10.7 MHz. The synthesizer employs a quartz crystal controlled oscillator feeding a phase lock loop whose frequency is varied via the tuning control. Quartz crystal filters for AM, and ceramic filters for FM provide required selectivity. As all signals are at the same IF, a common IF amplifier is employed. Further, a single phase lock loop is adapted to demodulate both AM and FM signals. The resultant demodulated signals are amplified, and tone shaped, via D. C. voltage controlled audio processor circuitry. The audio circuitry is adapted to accept auxiliary inputs, such as the output of a tape player. A digital display senses tuner status providing frequency read out. Additional provisions allow switching the display to read out tape player status, or to provide a time display from an electronic clock. |
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DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION The invention is better understood with reference to the figures wherein common numbers for the same or similar items have been used throughout to more clearly depict the preferred embodiment of the invention.
Referring to FIG.
1, a universal electronic radio according to the invention is shown in block form.
An antenna 12 collects broadcast RF signals and conducts them via line 14 to the diplexer 15.
The diplexer contains low and high pass filters routing the FM band signals to the FM front end 16, and the AM signals to the AM front end 18.
A bandswitch control acts through a tuning control 20 to activate a selected front end 16 or 18.
The front ends 16, 18 are more fully discussed with reference to FIG.
2, however each contains an RF filter which is electronically tunable over a desired band to pass selected signals.
In the preferred embodiment, the tuning component in the FM filter is a reverse biased silicon junction diode whose capacitance changes in a predetermined way as a function of a control voltage applied at front end terminal 19 by tuning control 20.
The AM tuning element is a saturable core reactor whose inductance changes as a function of current applied at AM front end terminal 21 via a voltage-to-current driver 22 which also receives a tuning control signal at its input 23.
A synthesizer 24, discussed more fully with reference to FIG.
3, connects to mixers located within each front end.
Line 25 connects the synthesizer 24 to the FM front end at terminal 26, and to the AM front end at terminal 27.
The synthesizer 24 is a tunable oscillator, which derives its tuning signal from the tuning control 20 at synthesizer input terminal 29.
In response to signals from the tuning control 20, the synthesizer 24 produces signals of predetermined frequency which, when mixed with the front end signals, produce an output at each front end 16, 18 centered at a single intermediate frequency.
In the preferred embodiment, the synthesizer 24 signal translates the FM front end signals to 10
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