Adaptive graphic equalizer and radio using same

• US 5,524,290 A
• Filed: 07/22/1991
• Issued: 06/04/1996
• Est. Priority Date: 07/22/1991
• Status: Expired due to Term

• Current Assignee: Motorola Solutions, Inc.
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Parmelee, Steven G., Ecklund, Lawrence M., Buchwald, Gregory J.
• Primary Examiner(s): Pham, Chi H.
• Application Number:
  US07/733,577
• Time in Patent Office: 1,779 Days
• Field of Search: 455/200.1, 455/233.1, 455/266, 455/267, 455/340, 333/28 R, 333/28 T, 381/86, 381/98, 381/101-103
• US Class Current: 455/200.1
• CPC Class Codes: H03G 5/025 Equalizers; Volume or gain control in limited frequency bands
• CPC Class Codes: H04B 1/16 Circuits

Abstract

An adaptive graphic equalizer (200, 400) has various ordinarily fixed parameters (such as center frequencies, filter bandwidths, and step response sensitivity) that are automatically altered to suit a particular audio source. In one embodiment, a radio (100) includes the graphic equalizer, and such adjustments are automatically made depending upon whether the user has selected the AM or FM reception band.

Claims

1. A radio, comprising:

A) receiver means for selectively receiving signals of interest;

B) input means operably coupled to the receiver means for selecting a particular signal of interest;

C) audio processing means operably coupled to the receiver means and the input means for converting the particular signal of interest into an audible signal, wherein the audio processing means includes;

i) a multi-band graphic equalizer having a plurality of filter bandwidths that are automatically adjusted in response to selection of a particular signal of interest.

2. The radio of claim 1, wherein the input means includes reception band select means for selecting a particular reception frequency band.

3. The radio of claim 2, wherein the reception band select means allows selection of one of a first reception frequency band and a second reception frequency band.

4. The radio of claim 3, wherein the first reception frequency band includes frequencies from 540 kHz to 1700 kHz, and the second reception frequency band includes frequencies from 88 MHz to 108 MHz.

5. A radio, comprising:

A) receiver means for selectively receiving signals of interest;

B) input means operably coupled to the receiver means for selecting a particular signal of interest;

C) audio processing means operably coupled to the receiver means and the input means for converting the particular signal of interest into an audible signal, wherein the audio processing means includes;

i) a multi-band graphic equalizer having input control amplitude step responses that are automatically adjusted in response to selection of a particular signal of interest.

6. The radio of claim 5, wherein the input means includes reception band select means for selecting a particular reception frequency band.

7. The radio of claim 6, wherein the reception band select means allows selection of one of a first reception frequency band and a second reception frequency band.

8. The radio of claim 7, wherein the first reception frequency band includes frequencies from 540 kHz to 1700 kHz, and the second reception frequency band includes frequencies from 88 MHz to 108 MHz.

9. A radio, comprising:

A) receiver means for selectively receiving signals of interest;

B) input means operably coupled to the receiver means for selecting a particular signal of interest;

C) audio processing means operably coupled to the receiver means and the input means for converting the particular signal of interest into an audible signal, wherein the audio processing means includes;

i) a multi-band graphic equalizer having a plurality of center frequencies and corresponding filter bandwidths that are automatically adjusted in response to selection of a particular signal of interest.

10. The radio of claim 9, wherein the input means includes reception band select means for selecting a particular broadcast frequency band.

11. The radio of claim 10, wherein the reception band select means allows selection of one of a first reception frequency band and a second reception frequency band.

12. The radio of claim 11, wherein the first reception frequency band includes frequencies from 540 kHz to 1700 kHz, and the second reception frequency band includes frequencies from 88 MHz to 108 MHz.

13. The radio of claim 9, wherein the audio processing means further includes display means for displaying current information regarding at least one of the center frequencies and amplitude step responses.

14. The radio of claim 13, wherein the multi-band equalizer further includes a user interface that corresponds to each center frequency, and wherein the display means includes a corresponding discrete display disposed proximal to each of the user interfaces.

15. The radio of claim 9, wherein the multi-band graphic equalizer further has input control step responses that are automatically adjusted in response to selection of a particular signal of interest.