GB1533761A - Echo device with noise suppression - Google Patents

Echo device with noise suppression

Info

Publication number
GB1533761A
GB1533761A GB3874676A GB3874676A GB1533761A GB 1533761 A GB1533761 A GB 1533761A GB 3874676 A GB3874676 A GB 3874676A GB 3874676 A GB3874676 A GB 3874676A GB 1533761 A GB1533761 A GB 1533761A
Authority
GB
United Kingdom
Prior art keywords
delay
echo
delay line
amplifier
sept
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.)
Expired
Application number
GB3874676A
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.)
Novanex Automation NV
Original Assignee
Novanex Automation NV
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 Novanex Automation NV filed Critical Novanex Automation NV
Publication of GB1533761A publication Critical patent/GB1533761A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K15/00—Acoustics not otherwise provided for
    • G10K15/08—Arrangements for producing a reverberation or echo sound
    • G10K15/12—Arrangements for producing a reverberation or echo sound using electronic time-delay networks
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems
    • H03G3/341—Muting when no signals or only weak signals are present

Abstract

1533761 Echo device NOVANEX AUTOMATION NV 17 Sept 1976 [18 Sept 1975] 38746/76 Heading H4R In an echo device comprising an input amplifier 1 coupled to a delay device 3 which in turn is coupled to an output amplifier 6, there is provided a control circuit 2 positioned between the input amplifier and delay line which responds to the input signal being below a predetermined level to supply a control signal to a read out and switching device 4 positioned between the delay line and the output amplifier to open circuit the delay path. Hence for low level signals no echo is added thereby reducing noise. The delay line may be of any known electronic or electromechanical form. A detailed embodiment of the units 1, 2, 4 and 6 is described with respect to Figure 2 (not shown). The unit 7 is a timer for selecting the desired delay. The threshold level and the output echo signal level and the amplitude of an echo signal fed back for further delay can be selected using potentiometers.
GB3874676A 1975-09-18 1976-09-17 Echo device with noise suppression Expired GB1533761A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7511000A NL7511000A (en) 1975-09-18 1975-09-18 NOISE REDUCER, MORE PARTICULARLY FOR AN ELECTRONIC ECHO DEVICE.

Publications (1)

Publication Number Publication Date
GB1533761A true GB1533761A (en) 1978-11-29

Family

ID=19824493

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3874676A Expired GB1533761A (en) 1975-09-18 1976-09-17 Echo device with noise suppression

Country Status (5)

Country Link
DE (1) DE2642000A1 (en)
FR (1) FR2325136A1 (en)
GB (1) GB1533761A (en)
IT (1) IT1074435B (en)
NL (1) NL7511000A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2154107A (en) * 1984-02-10 1985-08-29 Peter William Barnett Acoustic systems
US4649564A (en) * 1984-02-10 1987-03-10 Barnett Peter W Acoustic systems

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57133493A (en) * 1981-02-13 1982-08-18 Sony Corp Spring type reverberation adding apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1302904A (en) * 1956-06-15 1962-09-07 Nyegaard & Co As Process for preparing an enriched liver extract
NL145420B (en) * 1969-10-25 1975-03-17 Philips Nv CIRCUIT FOR SUPPRESSING TROUBLE IN AN FM RADIO RECEIVER.
DE2360983B2 (en) * 1973-12-07 1979-07-05 Deutsche Itt Industries Gmbh, 7800 Freiburg Reverberation facility

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2154107A (en) * 1984-02-10 1985-08-29 Peter William Barnett Acoustic systems
US4649564A (en) * 1984-02-10 1987-03-10 Barnett Peter W Acoustic systems

Also Published As

Publication number Publication date
IT1074435B (en) 1985-04-20
NL7511000A (en) 1977-03-22
DE2642000A1 (en) 1977-03-24
FR2325136A1 (en) 1977-04-15

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Legal Events

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