User adjustable volume control that accommodates hearing

• US 7,415,120 B1
• Filed: 04/14/1999
• Issued: 08/19/2008
• Est. Priority Date: 04/14/1998
• Status: Expired due to Fees

• Current Assignee: Mind Fusion, LLC (Ascend Innovation Management, LLC)
• Original Assignee: Akiba Electronics Institute LLC (Intellectual Ventures LLC)
• Inventors: Blum, Ronald D., Saunders, William R., Vaudrey, Michael A.
• Primary Examiner(s): Lee; Ping
• Application Number:
  US09/673,275
• Time in Patent Office: 3,415 Days
• Field of Search: 381/77, 381/82, 381/85, 381/120, 381/110, 381/104, 381/107, 381/56, 381/109, 381/119
• US Class Current: 381/109
• CPC Class Codes: H03G 3/32 the control being dependent upon ambient noise level or sound level

Abstract

A method for processing audio signals optimizes the listening experience for hearing impaired listeners, as well as non-hearing impaired listeners, without forcing hearing impaired individuals to feel stigmatized by requiring them to employ special hearing-impaired equipment. A user actuated controller controls a mixture of a preferred audio signal and a remaining audio signal across a range sufficiently wide enough to encompass all individuals. The preferred audio is recorded and maintained separate from all remaining audio and delivered to the listener in a manner that maintains the separateness of the preferred audio and the remaining audio. The user actuated controller includes the capability of automatically maintaining the listener established ratio in the face of changes in the audio signal. The user actuated controller enables the user to specify a range about the ratio in which the audio may vary, which permits the listener to expand the audio across a continuous range to whatever dynamic range his hearing can accommodate. The controller automatically adjusts to changes in incoming audio. The controller can react to relatively slowly moving changes or prevent short bursts of sound in the remaining audio from modifying the signal levels. The combination of the above aspects provides a heretofore not possible listening experience that can accommodate the listening desires of all listeners. The combination of the ability to control the ratio of preferred audio to remaining audio and to specify the dynamic range about the ratio in which the audio may vary, coupled with the ability of the controller to automatically adjust the signal levels in response to sudden changes in incoming audio, provides a powerful user capability that truly optimizes the listening experience for any listener.

Claims

1. An audio system for optimizing playing of an audio program, which includes a preferred audio signal and a remaining audio signal, for end users, which includes both hearing impaired and non-hearing impaired listeners, comprising:

a) a first end user adjustable amplifier for receiving the preferred audio signal and a first gain selected by an end user, and for amplifying the preferred audio signal to a level corresponding to the first gain specified by the user, said first end user adjustable amplifier having a range of amplification from zero to a maximum value, and said first end user adjustable amplifier having as a control output a gain selection value representing a numerical value of the first gain selected by the end user of the first end user adjustable amplifier;

b) a second end user adjustable amplifier for receiving the remaining audio signal and a second gain selected by the end user, and for amplifying the remaining audio signal to a level corresponding to the second gain specified by the user, said second end user adjustable amplifier having a range of amplification from zero to a maximum value, and said second end user adjustable amplifier having as a control output a gain selection value representing a numerical value of the second gain selected by the end user of the second end user adjustable amplifier; and

c) a corrector circuit for receiving as a first input the control output of the first end user adjustable amplifier, for receiving as a second input the control output of the second end user adjustable amplifier, for calculating a desired preferred audio signal to remaining audio signal ratio based on the first input and the second input, for receiving as a third input the output of the first end user adjustable amplifier, for receiving as a fourth input the output of the second end user adjustable amplifier, and for modifying the output of the first end user adjustable amplifier and the output of the second end user adjustable amplifier so that the actual preferred audio signal to remaining audio signal (PSRA) ratio corresponds to the calculated desired value of the preferred audio signal to remaining audio signal (PSRA) ratio.

2. The system according to claim 1, wherein the corrector circuit comprises:

a) a first divider for receiving as a numerator input the control output of the first end user adjustable amplifier, for receiving as a denominator input the control output of the second end user adjustable amplifier, and for outputting the result of the numerator input divided by the denominator input, which represents the end user desired preferred audio signal to remaining audio signal (PSRA) ratio;

b) a first vector accumulator coupled to the output of the first end user adjustable amplifier, for storing vector samples of the preferred audio signal;

c) a second vector accumulator coupled to the output of the second end user adjustable amplifier for storing vector samples of the remaining audio signal;

d) a first peak level detector coupled to the output of the first vector accumulator, wherein the first peak detector for calculating a transient amplitude of a segment of the preferred audio signal represented by the vector samples in the first vector accumulator;

e) a second peak level detector coupled to the output of the second vector accumulator, wherein the first peak detector for calculating a transient amplitude of a segment of the remaining audio signal represented by the vector samples in the second vector accumulator;

f) a second divider for receiving as a numerator input the output of the first peak level detector representing the transient amplitude of the segment of the preferred audio signal represented by the vector samples in the first vector accumulator, for receiving as a denominator input the output of the second peak detector representing the transient amplitude of the segment of the remaining audio signal represented by the vector samples in the second vector accumulator, and for outputting the result of the numerator input divided by the denominator input representing an actual value of the preferred audio signal to the remaining audio signal (PSRA) ratio;

g) a third divider for receiving as a numerator input the output of the first divider representing a desired value of the preferred audio signal to the remaining audio signal (PSRA) ratio, for receiving as a denominator input the output of the second divider representing an actual value of the preferred audio signal to the remaining audio signal (PSRA) ratio, and for outputting the result of the numerator input divided by the denominator input, which represents a difference between the desired and actual values of the preferred audio signal to the remaining audio signal (PSRA) ratio; and

h) a first multiplier for receiving as a first input the preferred audio signal, for receiving as a second input the output of the third divider, and for multiplying the output of the third divider and the preferred audio signal and for outputting the result, which is a corrected value of the user setting of the preferred audio signal to the remaining audio signal (PSRA) ratio.

3. The system according to claim 2, wherein the first and second vector accumulators include user selectable vector sizes.

4. The system according to claim 1, wherein the corrector circuit comprises:

a) a first divider for receiving as a numerator input the control output of the first end user adjustable amplifier, for receiving as a denominator input the control output of the second end user adjustable amplifier, and for outputting the result of the numerator input divided by the denominator input, which represents the end user desired preferred audio signal to remaining audio signal (PSRA) ratio;

b) a first vector accumulator coupled to the output of the first end user adjustable amplifier, for storing vector samples of the preferred audio signal;

c) a second vector accumulator coupled to the output of the second end user adjustable amplifier for storing vector samples of the remaining audio signal;

d) a first peak level detector coupled to the output of the first vector accumulator, wherein the first peak detector for calculating a transient amplitude of a segment of the preferred audio signal represented by the vector samples in the first vector accumulator;

e) a second peak level detector coupled to the output of the second vector accumulator, wherein the first peak detector for calculating a transient amplitude of a segment of the remaining audio signal represented by the vector samples in the second vector accumulator;

f) a second divider for receiving as a numerator input the output of the first peak level detector representing the transient amplitude of the segment of the preferred audio signal represented by the vector samples in the first vector accumulator, for receiving as a denominator input the output of the second peak detector representing the transient amplitude of the segment of the remaining audio signal represented by the vector samples in the second vector accumulator, and outputting the result of the numerator input divided by the denominator input representing an actual value of the preferred audio signal to the remaining audio signal (PSRA) ratio;

g) a third divider for receiving as a numerator input the output of the first divider representing a desired value of the preferred audio signal to the remaining audio signal (PSRA) ratio, for receiving as a denominator input the output of the second divider representing an actual value of the preferred audio signal to the remaining audio signal (PSRA) ratio, and for outputting the result of the numerator input divided by the denominator input, which represents a difference between the desired and actual values of the preferred audio signal to the remaining audio signal (PSRA) ratio;

h) a fourth divider having as a denominator input the output of the third divider, and for dividing one by the output of the third divider; and

i) a multiplier for receiving as a first input the remaining audio signal, for receiving as a second input the output of the fourth divider and for multiplying the output of the fourth divider and the remaining audio signal and for outputting the result, which is the corrected value of the user setting of the preferred audio signal to the remaining audio signal (PSRA) ratio.

5. An audio system for optimizing playing of an audio program, which includes a preferred audio signal and a remaining audio signal, for end users, which includes both hearing impaired and non-hearing impaired listeners, comprising:

a) a plurality of user selectable frequency dependent amplification devices, each device for establishing a preferred audio signal to remaining audio (PSRA) over a separate frequency band, and each of the plurality of user selectable frequency dependent amplification devices including;

(i) a first bandpass filter for receiving the preferred audio signal and for filtering out everything within the preferred audio signal except for a predetermined bandwidth of the preferred audio signal;

(ii) a second bandpass filter for receiving the remaining audio signal and for filtering out everything within the remaining audio signal except for a predetermined bandwidth of the remaining audio signal;

(iii) a first end user adjustable amplifier for receiving the predetermined bandwidth of the preferred audio signal and a first gain selected by an end user, and for amplifying the predetermined bandwidth of the preferred audio signal to a level corresponding to the first gain specified by the user, said first end user adjustable amplifier having a range of amplification from zero to a maximum value, and said first end user adjustable amplifier having as a control output a gain selection value representing a numerical value of the first gain selected by the end user of the first end user adjustable amplifier;

(iv) a second end user adjustable amplifier for receiving the predetermined bandwidth of the remaining audio signal and a second gain selected by the end user, and for amplifying the predetermined bandwidth of the remaining audio signal to a level corresponding to the second gain specified by the user, said second end user adjustable amplifier having a range of amplification from zero to a maximum value, and said second end user adjustable amplifier having as a control output a gain selection value representing a numerical value of the second gain selected by the end user of the second end user adjustable amplifier; and

(v) a corrector circuit for receiving as a first input the control output of the first end user adjustable amplifier, for receiving as a second input the control output of the second end user adjustable amplifier, for calculating a desired preferred audio signal to remaining audio signal ratio based on the first input and the second input, for receiving as a third input the output of the first end user adjustable amplifier, for receiving as a fourth input the output of the second end user adjustable amplifier, and for modifying the output of the first end user adjustable amplifier and the output of the second end user adjustable amplifier so that the actual preferred audio signal to remaining audio signal (PSRA) ratio for the predetermined bandwidth corresponds to the calculated desired value of the preferred audio signal to remaining audio signal (PSRA) ratio for the predetermined bandwidth; and

b) a summing amplifier for receiving the outputs of all of the plurality of user selectable frequency dependent amplification devices to create a total audio signal.

6. The system according to claim 5, wherein each of the corrector circuits comprises:

a) a first divider for receiving as a numerator input the control output of the first end user adjustable amplifier, for receiving as a denominator input the control output of the second end user adjustable amplifier, and for outputting the result of the numerator input divided by the denominator input, which represents the end user desired preferred audio signal to remaining audio signal (PSRA) ratio;

b) a first vector accumulator coupled to the output of the first end user adjustable amplifier, for storing vector samples of the preferred audio signal;

c) a second vector accumulator coupled to the output of the second end user adjustable amplifier for storing vector samples of the remaining audio signal;

d) a first peak level detector coupled to the output of the first vector accumulator, wherein the first peak detector for calculating a transient amplitude of a segment of the preferred audio signal represented by the vector samples in the first vector accumulator;

e) a second peak level detector coupled to the output of the second vector accumulator, wherein the first peak detector for calculating a transient amplitude of a segment of the remaining audio signal represented by the vector samples in the second vector accumulator;

f) a second divider for receiving as a numerator input the output of the first peak level detector representing the transient amplitude of the segment of the preferred audio signal represented by the vector samples in the first vector accumulator, for receiving as a denominator input the output of the second peak detector representing the transient amplitude of the segment of the remaining audio signal represented by the vector samples in the second vector accumulator, and for outputting the result of the numerator input divided by the denominator input representing an actual value of the preferred audio signal to the remaining audio signal (PSRA) ratio;

g) a third divider for receiving as a numerator input the output of the first divider representing a desired value of the preferred audio signal to the remaining audio signal (PSRA) ratio, for receiving as a denominator input the output of the second divider representing an actual value of the preferred audio signal to the remaining audio signal (PSRA) ratio, and for outputting the result of the numerator input divided by the denominator input, which represents a difference between the desired and actual values of the preferred audio signal to the remaining audio signal (PSRA) ratio; and

h) a first multiplier for receiving as a first input the preferred audio signal, for receiving as a second input the output of the third divider, and for multiplying the output of the third divider and the preferred audio signal and for outputting the result, which is a corrected value of the user setting of the preferred audio signal to the remaining audio signal (PSRA) ratio.

7. The system according to claim 5, wherein each of the corrector circuits comprises:

a) a first divider for receiving as a numerator input the control output of the first end user adjustable amplifier, for receiving as a denominator input the control output of the second end user adjustable amplifier, and for outputting the result of the numerator input divided by the denominator input, which represents the end user desired preferred audio signal to remaining audio signal (PSRA) ratio;

b) a first vector accumulator coupled to the output of the first end user adjustable amplifier, for storing vector samples of the preferred audio signal;

c) a second vector accumulator coupled to the output of the second end user adjustable amplifier for storing vector samples of the remaining audio signal;

d) a first peak level detector coupled to the output of the first vector accumulator, wherein the first peak detector for calculating a transient amplitude of a segment of the preferred audio signal represented by the vector samples in the first vector accumulator;

e) a second peak level detector coupled to the output of the second vector accumulator, wherein the first peak detector for calculating a transient amplitude of a segment of the remaining audio signal represented by the vector samples in the second vector accumulator;

f) a second divider for receiving as a numerator input the output of the first peak level detector representing the transient amplitude of the segment of the preferred audio signal represented by the vector samples in the first vector accumulator, for receiving as a denominator input the output of the second peak detector representing the transient amplitude of the segment of the remaining audio signal represented by the vector samples in the second vector accumulator, and for outputting the result of the numerator input divided by the denominator input representing an actual value of the preferred audio signal to the remaining audio signal (PSRA) ratio;

g) a third divider for receiving as a numerator input the output of the first divider representing a desired value of the preferred audio signal to the remaining audio signal (PSRA) ratio, for receiving as a denominator input the output of the second divider representing an actual value of the preferred audio signal to the remaining audio signal (PSRA) ratio, and for outputting the result of the numerator input divided by the denominator input, which represents a difference between the desired and actual values of the preferred audio signal to the remaining audio signal (PSRA) ratio;

h) a fourth divider having as a denominator input the output of the third divider, and for dividing one by the output of the third divider; and

i) a multiplier for receiving as a first input the remaining audio signal, for receiving as a second input the output of the fourth divider and for multiplying the output of the fourth divider and the remaining audio signal and for outputting the result, which is the corrected value of the user setting of the preferred audio signal to the remaining audio signal (PSRA) ratio.

8. A method for optimizing playing of an audio program for end users including both hearing impaired and non-hearing impaired listeners, which includes a preferred audio signal and a remaining audio signal, comprising:

a) receiving the preferred audio signal and a first gain selected by an end user, and amplifying the preferred audio signal to a level corresponding to the first gain specified by the user using a first end user adjustable amplifier having a range of amplification from zero to a maximum value, and said first end user adjustable amplifier having as a control output a gain selection value representing a numerical value of the first gain selected by the end user of the first end user adjustable amplifier;

b) receiving the remaining audio signal and a second gain selected by the end user, and amplifying the remaining audio signal to a level corresponding to the second gain specified by the user using a second end user adjustable amplifier having a range of amplification from zero to a maximum value, and said second end user adjustable amplifier having as a control output a gain selection value representing a numerical value of the second gain selected by the end user of the second end user adjustable amplifier; and

c) receiving as a first input the control output of the first end user adjustable amplifier using a corrector circuit, receiving as a second input the control output of the second end user adjustable amplifier, calculating a desired preferred audio signal to remaining audio signal ratio based on the first input and the second input, receiving as a third input the output of the first end user adjustable amplifier, receiving as a fourth input the output of the second end user adjustable amplifier, and modifying the output of the first end user adjustable amplifier and the output of the second end user adjustable amplifier so that the actual preferred audio signal to remaining audio signal (PSRA) ratio corresponds to the calculated desired value of the preferred audio signal to remaining audio signal (PSRA) ratio.

9. The method according to claim 8, wherein the corrector circuit performs:

a) receiving as a numerator input the control output of the first end user adjustable amplifier, receiving as a denominator input the control output of the second end user adjustable amplifier, and outputting the result of the numerator input divided by the denominator input, which represents the end user desired preferred audio signal to remaining audio signal (PSRA) ratio;

b) storing vector samples of the preferred audio signal;

c) storing vector samples of the remaining audio signal;

d) calculating a transient amplitude of a segment of the preferred audio signal represented by the vector samples of the preferred audio signal;

e) calculating a transient amplitude of a segment of the remaining audio signal represented by the vector samples of the remaining audio signal;

f) receiving as a numerator input the transient amplitude of the segment of the preferred audio signal, receiving as a denominator input the transient amplitude of the segment of the remaining audio signal, and outputting the result of the numerator input divided by the denominator input representing an actual value of the preferred audio signal to the remaining audio signal (PSRA) ratio;

g) receiving as a numerator input a desired value of the preferred audio signal to the remaining audio signal (PSRA) ratio, receiving as a denominator input an actual value of the preferred audio signal to the remaining audio signal (PSRA) ratio, and outputting the result of the numerator input divided by the denominator input, which represents a difference between the desired and actual values of the preferred audio signal to the remaining audio signal (PSRA) ratio; and

h) receiving as a first input the preferred audio signal, receiving as a second input the output of the third divider, and multiplying the difference between the desired and actual values of the preferred audio signal to the remaining audio signal (PSRA) ratio and the preferred audio signal and for outputting the result, which is a corrected value of the user setting of the preferred audio signal to the remaining audio signal (PSRA) ratio.

10. The method according to claim 9, wherein the size of the vector samples are user selectable.