Method and apparatus for automatically setting speaker mode in audio/video system

• US 7,792,310 B2
• Filed: 08/31/2005
• Issued: 09/07/2010
• Est. Priority Date: 11/16/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Jae-cheol, Kim, Jong-bae, Park, Hae-kwang
• Primary Examiner(s): Chin; Vivian
• Assistant Examiner(s): LAO, LUNSEE
• Application Number:
  US11/214,722
• Publication Number:
  US 20060104453A1
• Time in Patent Office: 1,833 Days
• Field of Search: 381/58, 381/59, 381/1, 381/98, 381/103, 381/16, 381/150, 381/182, 381/120, 381/104, 381/107, 381/111, 381/117, 381/96, 381/55, 700/94
• US Class Current: 381/59
• CPC Class Codes: H04R 2420/05 Detection of connection of loudspeakers or headphones to amplifiers
• CPC Class Codes: H04S 7/301 Automatic calibration of stereophonic sound system, e.g. with test microphone
• CPC Class Codes: H04S 7/308 Electronic adaptation dependent on speaker or headphone connection

Abstract

A method and apparatus for automatically determining a characteristic of a speaker and automatically setting a speaker mode in an audio/video system. The method includes: detecting a current for operating the speaker by inputting a predetermined signal; measuring an impedance characteristic of the speaker in accordance with a frequency change based on the detected current; determining a speaker type based on the measured impedance characteristic; and setting a speaker mode based on an impedance characteristic curve of the discriminated speaker type.

Claims

1. A method of automatically setting a speaker mode by which a pattern of a signal output to a speaker is determined, the method comprising:

detecting a current for operating the speaker by inputting a predetermined signal;

measuring an impedance characteristic of the speaker in accordance with a frequency change based on the detected current;

determining a speaker type based on a peak component and a dip component in a low frequency band of the measured impedance characteristic; and

setting the speaker mode based on an impedance characteristic curve of the determined speaker type;

wherein in determining the speaker type,

if two peak components and one dip component between the two peak components exist in the low frequency band of the impedance characteristic curve, it is determined that the speaker is a duct-type speaker; and

if one peak component exists in the low frequency band of the impedance characteristic curve, it is determined that the speaker is a sealed-type speaker.

2. The method of claim 1, wherein the detected current is current flowing from an amplifier to the speaker.

3. The method of claim 1, wherein the detected current is current flowing from a power supply to the amplifier.

4. The method of claim 1, further comprising:

if no current change is detected, determining that a corresponding speaker does not exist and outputting no signal.

5. The method of claim 1, wherein in the setting of the speaker mode,

if a frequency of the dip component between the peak components of the impedance characteristic curve is lower than a reference frequency, a mode of outputting a signal of an acoustic frequency band is determined;

and

if a frequency of the peak component of the impedance characteristic curve is higher than the reference frequency, a mode of outputting a signal of a mid-to-high band (excluding a low band) is determined.

6. A method of automatically setting a speaker mode by which a pattern of a signal output to a speaker is determined, the method comprising:

detecting a current for operating the speaker by inputting a predetermined signal;

measuring an impedance characteristic of the speaker in accordance with a frequency change based on the detected current;

determining a speaker type based on a peak component and a dip component in a low frequency band of the measured impedance characteristic; and

setting the speaker mode based on an impedance characteristic curve of the determined speaker type;

wherein in the setting of the speaker mode,

if it is determined that the speaker is a duct-type speaker, a frequency of the dip component between the peak components of the impedance characteristic curve is detected; and

if it is determined that the speaker is a sealed-type speaker, a frequency of the peak components of the impedance characteristic curve is detected.

7. An apparatus for automatically setting a speaker mode in a multi-channel speaker system, the apparatus comprising:

a speaker;

a power supply configured to supply power;

an amplifier configured to amplify a signal;

a current detector configured to detect a current output one of from the amplifier to the speaker and from the power supply to the amplifier; and

a digital signal processor configured to output a broadband signal including a low frequency to the amplifier, measure an impedance characteristic of the speaker based on the current detected by the current detector, determining a speaker type based on peak component and dip component in a low frequency band of the measured impedance characteristic, and a speaker mode based on an impedance characteristic curve of the determined speaker type;

wherein the digital signal processor comprises;

means for generating a broadband signal including the low frequency;

means for measuring the impedance characteristic in accordance with a frequency based on the current detected by the current detector;

means for determining a duct-type speaker from a sealed-type speaker based on the measured impedance characteristic;

means for detecting a frequency of a dip component between peak components of the impedance characteristic curve if the speaker is the duct-type speaker and detecting a frequency of the peak component of the impedance characteristic curve if the speaker is a sealed-type speaker; and

means for setting a speaker mode by comparing one of the detected dip and peak frequency to a reference frequency.