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GB2317529A - Microphone/audio mixer - Google Patents

Microphone/audio mixer Download PDF

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Publication number
GB2317529A
GB2317529A GB9718822A GB9718822A GB2317529A GB 2317529 A GB2317529 A GB 2317529A GB 9718822 A GB9718822 A GB 9718822A GB 9718822 A GB9718822 A GB 9718822A GB 2317529 A GB2317529 A GB 2317529A
Authority
GB
United Kingdom
Prior art keywords
microphone
audio
mixer
master unit
audio mixer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB9718822A
Other versions
GB2317529B (en
GB9718822D0 (en
Inventor
Michael Holdsworth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of GB9718822D0 publication Critical patent/GB9718822D0/en
Publication of GB2317529A publication Critical patent/GB2317529A/en
Application granted granted Critical
Publication of GB2317529B publication Critical patent/GB2317529B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/02—Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information
    • H04H60/04—Studio equipment; Interconnection of studios
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones
    • H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/40—Arrangements for obtaining a desired directivity characteristic
    • H04R25/407—Circuits for combining signals of a plurality of transducers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Amplifiers (AREA)
  • Circuit For Audible Band Transducer (AREA)

Abstract

A microphone/audio mixer, eg for unbalanced microphones, in which the mixing of any number of microphones M1,2,3...Mn linked only by a single audio cable is achieved by using a virtual earth mining circuit which is physically divided at the virtual earth point, so that each summing resistor R1,2,3...Rn is housed in a separate input unit, the input units being linked together by a single audio line to the summing point of the mixer circuit in the master unit, the output of which carries the mixed signals to the input of any sound system.

Description

Microphone/Audio Mixer This invention relates to a microphone/audio mixer.
In conference, seminar & similar situations where a sound reinforcement or audio frequency induction loop system (AFILS) is in use, it is ideal if every person speaking has his or her own microphone in order to minimise the adverse effects of room acoustics and to achieve optimum performance from the systems in use. This is very important for hearing impaired people who may be listening via the AFILS, using their hearing aids switched to "T".
However, the use of multiple microphones or other audio equipment requires multiple cables and multiple input mixing facilities. This can be relatively expensive and cumbersome to install, especially in portable systems which may have to be installed in various venues and removed after use. Microphone & audio signals can be mixed to an audio amplifier via a single cable linking each source by employing advanced digital technology or other methods, but these systems are complex and expensive.
According to the present invention, the mixing of any number of microphone or audio inputs linked only by a single audio cable is achieved by using a virtual earth mixing circuit which is physically divided at the virtual earth point, so that each summing resistor is housed in a separate input unit, input units being linked together by a single audio line to the summing point of the mixer circuit in the master unit, the output of which carries the mixed signals to the input of any sound system.
A specific basic embodiment of the invention will now be described by way of example with reference to the accompanying drawing.
Figure 1 is the schematic diagram of the system in the simplest form, for unbalanced microphones. Each microphone Ml,2,3....Mn plugs into its own input unit which contains the summing resistor R1,2,3...Rn of the virtual earth mixer.
The input units are connected in daisy-chain fashion by a single audio cable to the summing point of the virtual earth mixer in the master unit which contains the rest of the virtual earth mixing circuit.
The master unit may be connected between any point in the daisy-chain and the sound system.

Claims (4)

  1. Microphone/Audio Mixer
    Claims 1. An audio mixer in which the mixing of any number of microphone or audio inputs, linked only by a single audio cable, is achieved by using a virtual earth mixing circuit which is physically divided at the virtual earth point, so that each summing resistor is housed in a separate input unit, the input units being linked together by a single audio line to the summing point of the mixer circuit in the master unit, the output of which carries the mixed signals to the input of any sound system.
  2. 2. A microphone/audio mixer as claimed in 1, in which the master unit is incorporated in a sound system amplifier.
  3. 3. A microphone/audio mixer as claimed in 1, in which the master unit is incorporated into an induction loop amplifier.
  4. 4. A microphone/audio mixer as claimed in 1, in which the master unit is incorporated in a tape or other sound recording machine.
GB9718822A 1996-09-04 1997-09-04 Microphone/audio mixer Expired - Fee Related GB2317529B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GBGB9618410.6A GB9618410D0 (en) 1996-09-04 1996-09-04 Conference microphone/audio mixing system

Publications (3)

Publication Number Publication Date
GB9718822D0 GB9718822D0 (en) 1997-11-12
GB2317529A true GB2317529A (en) 1998-03-25
GB2317529B GB2317529B (en) 2000-11-15

Family

ID=10799366

Family Applications (2)

Application Number Title Priority Date Filing Date
GBGB9618410.6A Pending GB9618410D0 (en) 1996-09-04 1996-09-04 Conference microphone/audio mixing system
GB9718822A Expired - Fee Related GB2317529B (en) 1996-09-04 1997-09-04 Microphone/audio mixer

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GBGB9618410.6A Pending GB9618410D0 (en) 1996-09-04 1996-09-04 Conference microphone/audio mixing system

Country Status (1)

Country Link
GB (2) GB9618410D0 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1197948A2 (en) * 2000-08-23 2002-04-17 SSD Company Limited Karaoke device with built-in microphone and microphone therefor

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB299041A (en) * 1927-10-21 1930-01-03 Electrical Res Prod Inc Improvements in or relating to electrical transmission systems
GB329747A (en) * 1929-03-20 1930-05-29 Paul Gustavus Adolphus Helmuth Improvements in thermionic or like amplifiers
GB655037A (en) * 1947-09-16 1951-07-11 Standard Telephones Cables Ltd Improvements in or relating to electrical mixer circuits
GB697180A (en) * 1950-09-22 1953-09-16 British Thomson Houston Co Ltd Improvements relating to potentiometers and circuit arrangements used in connection therewith
GB2177575A (en) * 1985-04-03 1987-01-21 Seth Snyder Apparatus and method for re-establishing previously established settings on the controls of an audio mixer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB299041A (en) * 1927-10-21 1930-01-03 Electrical Res Prod Inc Improvements in or relating to electrical transmission systems
GB329747A (en) * 1929-03-20 1930-05-29 Paul Gustavus Adolphus Helmuth Improvements in thermionic or like amplifiers
GB655037A (en) * 1947-09-16 1951-07-11 Standard Telephones Cables Ltd Improvements in or relating to electrical mixer circuits
GB697180A (en) * 1950-09-22 1953-09-16 British Thomson Houston Co Ltd Improvements relating to potentiometers and circuit arrangements used in connection therewith
GB2177575A (en) * 1985-04-03 1987-01-21 Seth Snyder Apparatus and method for re-establishing previously established settings on the controls of an audio mixer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1197948A2 (en) * 2000-08-23 2002-04-17 SSD Company Limited Karaoke device with built-in microphone and microphone therefor
EP1197948A3 (en) * 2000-08-23 2004-08-04 SSD Company Limited Karaoke device with built-in microphone and microphone therefor

Also Published As

Publication number Publication date
GB9618410D0 (en) 1996-10-16
GB2317529B (en) 2000-11-15
GB9718822D0 (en) 1997-11-12

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20150904