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Circuit arrangement for derivation of a signal dependent on the change direction of the incoming signal level
| Details |
Inventors: Herrmann, Matthias; Vogt, Lothar; Kaesser, Juergen;
Assignee: Blaupunkt-Werke GmbH (Hildesheim, DE)
Primary Examiner: Eisenzopf; Reinhard J.
Assistant Examiner: Banks-Harold; Marsha D.
Attorney, Agent or Firm: Kenyon & Kenyon
In a circuit arrangement for deriving a signal dependent on the change direction of the incoming signal level in a radio receiver, controllable by a microcomputer, a comparator is provided outside the microcomputer to which a signal representing the respective signal strength and a signal generated by the microcomputer representing the signal strength at an earlier point in time can be supplied. An output signal from the comparator can be supplied to the microcomputer. |
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DETAILED DESCRIPTION OF THE INVENTION The figures drawing shows essential parts of a radio receiver 1, especially those parts required to explain the function of the circuit arrangement according to the present invention within the radio receiver.
In addition, the drawing shows a microcomputer 2 that controls radio receiver 1.
Individual circuit blocks within radio receiver 1.
constitute functional groups known of themselves.
However, it is not necessary within the framework of the present invention to make these functional groups discrete modules as well.
With a very high degree of integration, it is also possible to accomplish complete digital signal processing of the receiver in one integrated circuit, including signal processing steps such as filtration or nonlinear weighting, by computer operations.
In addition, digital signal processors and other digital circuits, such as shift registers, flip-flops, etc.
, can be jointly provided with an integrated circuit to produce a receiver with the circuit arrangement according to the present invention.
The signal received through an antenna 3 is amplified, selected, and demodulated in a tuner 4 in a manner known of itself.
A demodulated multiplex signal MPX can be obtained from an output 5 of tuner 4, said signal being supplied to a traffic radio/RDS decoder 6 and an automatic noise suppression circuit 7.
A stereo decoder 8 and an audio processor 9 are connected thereto.
The audio signals obtained are reproduced in a manner known of itself with the aid of two output stages 10, 11 and two speakers 12, 13.
Radio data signals RDS generated by traffic radio/RDS decoder 6 are supplied to microcomputer Tuner 4 has another output 14 at which an AM signal, resulting from amplitude demodulation of the FM intermediate frequency signal, is obtained.
This is conducted to a low-pass filter 15, at whose output an n-bit-wide signal strength signal is obtained.
This is supplied to microcomputer 2 and one input X of a comparator 16.
Another input Y of the comparator receives a similar n-bit-wide signal from the microcomputer, representing the signal strength at a previous point in time
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Television 
