Receiver with signal classifier

• US 5,651,030 A
• Filed: 05/06/1991
• Issued: 07/22/1997
• Est. Priority Date: 05/06/1991
• Status: Expired due to Term

• Current Assignee: Motorola Solutions, Inc.
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Young, Richard S., Wong, Chin-Pan
• Primary Examiner(s): Chin, Stephen
• Application Number:
  US07/696,466
• Time in Patent Office: 2,269 Days
• Field of Search: 375/75, 375/10, 375/96, 375/224, 375/316, 375/343, 455/67, 455/115, 455/226.1, 324/77 B, 324/77 C
• US Class Current: 375/316
• CPC Class Codes: H04B 1/66 for reducing bandwidth of signals; for improving efficiency of transmission H04B1/68 takes precedence

Abstract

Briefly, according to the invention, a receiver (100) for receiving and decoding a carder signal is described. A carrier signal is modulated with an information signal which has one of a plurality of formats. The receiver includes a circuit (104) for receiving and demodulating the carrier signal to produce a demodulated signal. The receiver (100) also includes a digital signal processing subsystem (108) for calculating the correlation function of the demodulated signal and based on this correlation function classifies the format of the demodulated signal. A decoder (118) is further included in the receiver (100) to decode the demodulated signal once it has been classified.

Claims

1. A receiver for receiving and decoding a carrier signal modulated with an information signal having one of a plurality of formats, the receiver comprising:

receiver means for receiving and demodulating a received signal to produce a demodulated signal;

calculation means for calculating the correlation function of the demodulated signal;

classifier means responsive to the calculation means for classifying the format of the demodulated signal; and

decoder means responsive to the classifier means for decoding the demodulated signal.

2. The receiver of claim 1, wherein the means for calculating the correlation function includes means for calculating the auto-correlation function of the demodulated signal.

3. The receiver of claim 1, wherein the information signal includes a digital signal.

4. The receiver of claim 3, wherein the digital signal includes a multi-level digital signal.

5. The receiver of claim 1, wherein the classifier means includes a Digital Signal Processor (DSP).

6. The receiver of claim 1, wherein the classifier means includes means for comparing a plurality of values of the calculated correlation function with a plurality of pre-determined values.

7. The receiver of claim 1, wherein the classifier means includes means for classifying the signalling format of the demodulated signal.

8. The receiver of claim 1, wherein the classifier means includes means for classifying the signalling rate of the demodulated signal.

9. A receiver for receiving a carrier signal modulated with an information signal having one of a plurality of signaling formats, the receiver comprising:

receiver means for receiving and demodulating the carrier signal to produce a demodulated information signal;

signal processing means having a plurality of decoding routines suitable for decoding the plurality of signalling formats, including;

calculation means for calculating the auto-correlation function of the demodulated information signal; and

invoking means responsive to the calculation means for invoking one of the plurality of decoding routines suited to decode the demodulated information signal.

10. The receiver of claim 9, wherein the signal processor means includes a Digital Signal Processor (DSP).

11. The receiver of claim 9, wherein the signal processor means includes memory means for buffering a portion of the demodulated information signal.

12. The receiver of claim 9, wherein the signal processor means includes memory means for storing the plurality of decoding routines.