Integrated multimedia signal processing system using centralized processing of signals

• US 8,880,205 B2
• Filed: 08/16/2005
• Issued: 11/04/2014
• Est. Priority Date: 12/30/2004
• Status: Active Grant

• Current Assignee: Mondo Systems, Inc.
• Original Assignee: Mondo Systems, Inc.
• Inventors: Chung, Chul
• Primary Examiner(s): MCCORD, PAUL C
• Application Number:
  US11/204,375
• Publication Number:
  US 20060149402A1
• Time in Patent Office: 3,367 Days
• Field of Search: 700/94
• US Class Current: 700/94
• CPC Class Codes: H04S 7/307 Frequency adjustment, e.g. tone control H04S7/301 takes precedence

Abstract

Integrated processing of multimedia signals can eliminate unnecessary signal processors and converters without losing the functionality of typical home entertainment system components. The integrated multimedia system includes a main player that captures and processes signals digitally. The main player may adjust the audio signal to provide audio output of equal loudness across all frequencies by accounting for sensitivity of the human ear for sounds of varying frequencies. The main player can also account for perceived differences in loudness based on the angle of a listener to a speaker by detecting the position of a user and making an adjustment accordingly. The invention further provides a speaker that has embedded performance characteristics or an identifier that allows the system to provide an optimal speaker driving current for a particular system or determine how that speaker would be best implemented in the integrated system.

Claims

1. An integrated audio processing system, comprising:

an audio source;

an amplifier configured to generate a plurality of speaker driving currents in response to a plurality of speaker driving signals;

a plurality of dummy speakers directly driven by the plurality of speaker driving currents, each dummy speaker comprising a plurality of speaker units and not containing any analog cross-over network;

an input device configured to provide listener position information comprising a measured horizontal angle and a measured vertical angle between the listener and one of the dummy speakers;

a central processing unit adapted to be responsive to an audio signal from the audio source; and

a digital volume control module comprising;

a frequency separation module configured to separate the audio signal into a plurality of frequency ranges;

a reference data module configured to provide reference data comprising information regarding human sensitivity to sound pressure level corresponding to each frequency range and the angle between the listener and one of the dummy speakers in a range of 0°

to 30°

; and

a signal adjusting module configured to independently adjust each frequency range of the separated audio signal based on the reference data,

wherein;

the digital volume control module is configured to independently adjust each of the frequency ranges of the audio signal to provide an equal-loudness level for all of the frequency ranges of the audio signal at the position of the listener based on the listener position information provided to the digital volume control module by the input device; and

the frequency separation module is configured to separate the audio signal based on the reference data, and to separately provide each of the speaker units with one of the speaker driving signals containing one of the frequency ranges which differs from the frequency ranges provided to the other driver units.

2. The system of claim 1, wherein the digital volume control module is configured to adjust the audio signal based on pre-set loudness values corresponding to each frequency range.

3. The system of claim 1, wherein an adjustment in mid frequency ranges is greater than an adjustment in low frequency ranges.

4. The integrated audio processing system of claim 1, wherein the listener position information further comprises a distance between a listener and one of the dummy speakers.

5. A method for controlling loudness of sound reproduction, comprising:

receiving an audio signal;

acquiring a control request;

separating the audio signal into a plurality of frequency ranges;

providing a plurality of speaker driving signals from an amplifier, the speaker driving signals driving a plurality of speaker units in each one of a plurality of dummy speakers, wherein each of the speaker units is separately provided with one of the speaker driving signals containing one of the frequency ranges which differs from the frequency ranges provided to the other speaker units, and wherein the dummy speakers do not contain any analog cross-over network;

adjusting each frequency range of the audio signal independently based on the acquired control request and reference data;

determining a position of a user with respect to a sound reproduction source via an input device by measuring both a horizontal angle and a vertical angle between the listener and one of the dummy speakers; and

adiustinq a volume of the audio signal output from one of the dummy speakers according to the reference data,

wherein the reference data comprises information regarding human sensitivity to sound pressure level corresponding to each frequency range and the angle between the listener and one of the dummy speakers in a range of 0°

to 30°

.

6. The method of claim 5, wherein the information comprises pre-set loudness values corresponding to each frequency range.

7. The method of claim 6, wherein the pre-set loudness values are based on a human sensitivity to a sound pressure level corresponding to each frequency range.

8. The method of claim 7, wherein the reference data are modified according to a user input.

9. The method of claim 5, wherein the reference data corresponds to a user'"'"'s preference according to user input.

10. The method of claim 5, wherein the reference data further comprises a sound reproduction source characteristic.

11. The method of claim 10, wherein the sound reproduction source characteristic at least one of:

a sound reproduction capability across a frequency spectrum;

nominal output power;

recommended amplification power;

input impedance;

speaker housing dimensions;

sensitivity;

crossover frequency; and

number of sub-speaker components.

12. The method of claim 5, wherein the reference data further comprises normal equal-loudness-level contours for pure tones.

13. An integrated audio processing system, comprising:

an audio source;

an amplifier configured to generate a plurality of speaker driving currents in response to a plurality of speaker driving signals;

a plurality of dummy speakers directly driven by the plurality of speaker driving currents, each dummy speaker comprising a plurality of speaker units and not containing any analog cross-over network;

an input device configured to provide listener position information comprising a measured horizontal angle and a measured vertical angle between the listener and one of the dummy speakers;

a central processing unit adapted to be responsive to an audio signal from the audio source; and

a digital volume control module providing gain or adjusting gain in a digital signal level, the digital volume control module comprising;

a frequency separation module configured to separate the audio signal into a plurality of frequency ranges;

a reference data module configured to provide reference data comprising information regarding human sensitivity to sound pressure level corresponding to each frequency range and the angle between the listener and one of the dummy speakers in a range of 0°

to 30°

; and

;

a signal adjusting module configured to independently adjust each frequency range of the separated audio signal based on the reference data,

wherein;

the digital volume control module is configured to independently adjust each of a plurality of frequency ranges of the audio signal to provide an equal-loudness level for all frequency ranges of the audio signal at the position of the listener based on the listener position information provided to the digital volume control module by the input device and

the frequency separation module is configured to separate the audio signal based on the reference data, and to separately provide each of the speaker units with one of the speaker driving signals containing one of the frequency ranges which differs from the frequency ranges provided to the other driver units.

14. A method for controlling loudness of sound reproduction, comprising:

receiving an audio signal;

acquiring a control request;

separating the audio signal into a plurality of frequency ranges;

providing a plurality of speaker driving signals from an amplifier, the speaker driving signals driving a plurality of speaker units in each one of a plurality of dummy speakers, wherein each of the speaker units is separately provided with one of the speaker driving signals containing one of the frequency ranges which differs from the frequency ranges provided to the other speaker units, and wherein the dummy speakers do not contain any analog cross-over network;

checking reference data for each frequency range;

adjusting gain in a digital signal level of each frequency range of the audio signal independently based on the acquired control request and reference data;

and

determining a position of a user with respect to a sound reproduction source via an input device by measuring both a horizontal angle and a vertical angle between the listener and one of the dummy speakers; and

adjusting a volume of the audio signal output from one of the dummy speakers according to the reference data,

wherein the reference data comprises information regarding human sensitivity to sound pressure level corresponding to each frequency range and the angle between the listener and one of the dummy speakers in a range of 0°

to 30°

.