Search book title
Enter keywords for book title search
Search book content
Enter keywords for book content search
Filters:
FORMAT
BOOKS
All Books
PACKAGES
All Packages
EDITION
to
PUBLISHER
AABC
(1)
AAMI
(326)
ACI
(572)
AISC
(44)
ASA
(234)
ASCE
(969)
ASHRAE
(652)
ASME
(2114)
ASSE
(64)
ASTM
(92448)
AWC
(54)
AWWA
(535)
BHMA
(117)
BICSI
(33)
BIFMA
(20)
BOMA
(19)
BSI
(92811)
CHD
(3)
CRSI
(17)
IAHSS
(1)
IAPMO
(351)
ICC
(300)
IEEE
(6217)
IES
(239)
ISEA
(16)
Joint Commission
(177)
Joint Commission Int.
(1)
NETA
(5)
NFPA
(1621)
TCNA
(16)
TMS
(18)
USGBC
(28)
WILEY
(4)
 
AR
(6)
AZ
(7)
CA
(115)
CT
(3)
FL
(57)
ID
(5)
IL
(5)
IN
(1)
KY
(1)
LA
(2)
MI
(23)
MN
(26)
NC
(27)
NJ
(13)
NY
(61)
OH
(24)
OR
(22)
PA
(7)
RI
(8)
SC
(20)
SD
(1)
TX
(3)
VA
(50)
VT
(6)
WA
(31)
CONTENT TYPE
 Act
 Admin Code
 Announcements
 Bill
 Book
 CADD File
 CAN
 CEU
 Charter
 Checklist
 City Code
 Code
 Commentary
 Comprehensive Plan
 Conference Paper
 County Code
 Course
 DHS Documents
 Document
 Errata
 Executive Regulation
 Federal Guideline
 Firm Content
 Guideline
 Handbook
 Interpretation
 Journal
 Land Use and Development
 Law
 Legislative Rule
 Local Amendment
 Local Code
 Local Document
 Local Regulation
 Local Standards
 Manual
 Model Code
 Model Standard
 Notice
 Ordinance
 Other
 Paperback
 PASS
 Periodicals
 PIN
 Plan
 Policy
 Product
 Program
 Provisions
 Requirements
 Revisions
 Rules & Regulations
 Standards
 State Amendment
 State Code
 State Manual
 State Plan
 State Standards
 Statute
 Study Guide
 Supplement
 Technical Bulletin
 All
  • BSI
    BS 6840-8:1988, IEC 60268-8:1973 Sound system equipment - Methods for specifying and measuring the characteristics of automatic gain control devices
    Edition: 1988
    $316.70
    / user per year

Description of BS 6840-8:1988 1988

1.1 These recommendations apply to automatic gain control circuits (AGC-circuits) used for different purposes in sound systems.

1.2 These recommendations include devices which have limiting and/or compressing properties with respect to the envelope of the input signal.

  1. Limiting action is mainly used as a safeguard to prevent overloading of equipment such as tape recorders, power amplifiers, transmitters, etc.
  2. Compression is used to reduce the dynamic range of speech and music programmes. The object of introducing compression is to match the dynamic range of the programme material to the available signal-to-noise ratio of the succeeding transmission chain or to the difference in level between the programme sound level allowed and the ambient noise level in the surroundings where the programme is radiated.

    Compression is also used to achieve special effects when reproducing sound programmes.

1.3 These recommendations do not include:

  1. expanders, as such devices for the time being are only used in highly specialized professional equipment. The definitions in this recommendation can, however, be extended to also include such devices.
  2. devices in which the gain in a sound channel is controlled, not by the signal fed through the channel but from an external source, e.g. when the gain in a paging channel is varied in accordance with the ambient noise level in the listening area or for “override limiters” where the gain in a music channel is reduced when the announcer speaks. The characteristics of such devices may be specified and measured in a similar way.
  3. clipping devices, as such devices are non-linear devices used for cutting off the peaks above a certain level; such devices differ basically from limiters and compressors which, in a steady state, preserve the waveform of the input signal.


Devices for limiting and/or compressing properties are included, but expanders, clipping devices, and gain control using an external source are not included.

Standard NumberBS 6840-8:1988, IEC 60268-8:1973
TitleSound system equipment - Methods for specifying and measuring the characteristics of automatic gain control devices
StatusConfirmed
Publication Date1988-02-29
ReplacesBS 5428-7:1979
Identical National Standard OfIEC 60268-8:1973
DescriptorsAutomatic, Amplifiers, Electrical measurement, Gain control, Communication equipment, Audio amplifiers, Marking, Circuits, Electronic equipment and components, Audio equipment, Audio systems, Electric distortion, Electrical testing
ICS33.160.30 Audio systems
CommitteeEPL/100
ISBN0 580 16212 5
PublisherBSI
Pages16

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
GROUPS
X