GB1462719A – Amplifier arrangements for magnetic tape apparatus
– Google Patents
GB1462719A – Amplifier arrangements for magnetic tape apparatus
– Google Patents
Amplifier arrangements for magnetic tape apparatus
Info
Publication number
GB1462719A
GB1462719A
GB2861274A
GB2861274A
GB1462719A
GB 1462719 A
GB1462719 A
GB 1462719A
GB 2861274 A
GB2861274 A
GB 2861274A
GB 2861274 A
GB2861274 A
GB 2861274A
GB 1462719 A
GB1462719 A
GB 1462719A
Authority
GB
United Kingdom
Prior art keywords
noise reduction
circuit
switch
noise
switched
Prior art date
1973-06-28
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
GB2861274A
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.)
Sony Corp
Original Assignee
Sony Corp
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.)
1973-06-28
Filing date
1974-06-27
Publication date
1977-01-26
1974-06-27
Application filed by Sony Corp
filed
Critical
Sony Corp
1977-01-26
Publication of GB1462719A
publication
Critical
patent/GB1462719A/en
Status
Expired
legal-status
Critical
Current
Links
Espacenet
Global Dossier
Discuss
Classifications
G—PHYSICS
G11—INFORMATION STORAGE
G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus Intermediate mediums; Apparatus or processes specially adapted for their manufacture
G11B23/0007—Circuits or methods for reducing noise, for correction of distortion, or for changing density of recorded information
G—PHYSICS
G11—INFORMATION STORAGE
G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
G11B20/24—Signal processing not specific to the method of recording or reproducing; Circuits therefor for reducing noise
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03G—CONTROL OF AMPLIFICATION
H03G7/00—Volume compression or expansion in amplifiers
H03G7/06—Volume compression or expansion in amplifiers having semiconductor devices
H—ELECTRICITY
H03—ELECTRONIC CIRCUITRY
H03G—CONTROL OF AMPLIFICATION
H03G9/00—Combinations of two or more types of control, e.g. gain control and tone control
H03G9/02—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers
H03G9/12—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having semiconductor devices
H03G9/18—Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having semiconductor devices for tone control and volume expansion or compression
Abstract
1462719 Companders SONY CORP 27 June 1974 [28 June 1973] 28612/74 Heading H4R In a tape recorder which incorporates a noise reducing circuit 10, Fig. 5, which can be switched into or out of its operative condition by a switch 15, a switch 16 is provided, ganged with the noise reduction circuit switch 15, which lowers the recording level by, at most, an amount corresponding to the reduction in noise level achieved by the noise reduction circuit, so as to achieve a better dynamic range in the recordings. As described the noise reducing circuit incorporates a variable cut off filter 60, Fig. 2, whose cut off frequency is controlled by the collector emitter impedance of transistor 68 fed with a control voltage derived from the filter output by control circuit 7. The noise reduction circuit 10, Fig. 5, achieves a noise reduction of 10dB. and the attenuator 16 is arranged to lower the signal level by 5 dB. when the noise reduction is switched in to give both noise reduction and dynamic range improvement. For reproduction a switch (26, Fig. 6, not shown), is provided to increase the reproduced signal level by 5 dB. when the noise reduction circuit is switched into its operative condition. The signal level meter circuit 18 is arranged to be fed with the full signal at all times.
GB2861274A
1973-06-28
1974-06-27
Amplifier arrangements for magnetic tape apparatus
Expired
GB1462719A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
JP1973076795U
JPS5024112U
(en)
1973-06-28
1973-06-28
Publications (1)
Publication Number
Publication Date
GB1462719A
true
GB1462719A
(en)
1977-01-26
Family
ID=13615557
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB2861274A
Expired
GB1462719A
(en)
1973-06-28
1974-06-27
Amplifier arrangements for magnetic tape apparatus
Country Status (8)
Country
Link
US
(1)
US3977023A
(en)
JP
(1)
JPS5024112U
(en)
CA
(1)
CA1001956A
(en)
DE
(1)
DE2431188A1
(en)
FR
(1)
FR2235447B1
(en)
GB
(1)
GB1462719A
(en)
IT
(1)
IT1015567B
(en)
NL
(1)
NL7408630A
(en)
Families Citing this family (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US4319089A
(en)
*
1978-11-03
1982-03-09
Quasar Microsystems, Inc.
Telephone answering machine
JPH05266589A
(en)
*
1992-03-23
1993-10-15
Sony Corp
Digital signal regenerating circuit
Family Cites Families (1)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
US3379959A
(en)
*
1965-04-30
1968-04-23
Sangamo Electric Co
Automatic attenuator device
1973
1973-06-28
JP
JP1973076795U
patent/JPS5024112U/ja
active
Pending
1974
1974-06-21
US
US05/481,807
patent/US3977023A/en
not_active
Expired – Lifetime
1974-06-26
NL
NL7408630A
patent/NL7408630A/xx
not_active
Application Discontinuation
1974-06-27
CA
CA203,593A
patent/CA1001956A/en
not_active
Expired
1974-06-27
GB
GB2861274A
patent/GB1462719A/en
not_active
Expired
1974-06-28
DE
DE2431188A
patent/DE2431188A1/en
not_active
Withdrawn
1974-06-28
FR
FR7422790A
patent/FR2235447B1/fr
not_active
Expired
1974-06-28
IT
IT7424639A
patent/IT1015567B/en
active
Also Published As
Publication number
Publication date
CA1001956A
(en)
1976-12-21
US3977023A
(en)
1976-08-24
FR2235447B1
(en)
1979-10-05
JPS5024112U
(en)
1975-03-18
DE2431188A1
(en)
1975-01-16
IT1015567B
(en)
1977-05-20
NL7408630A
(en)
1974-12-31
FR2235447A1
(en)
1975-01-24
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Legal Events
Date
Code
Title
Description
1977-06-16
PS
Patent sealed [section 19, patents act 1949]
1986-02-26
PCNP
Patent ceased through non-payment of renewal fee
