Record revealed
Hoax letter signed by ‘Jack the Ripper’
This is one of hundreds of letters in police files claiming to have been written by the infamous Whitechapel Murderer – otherwise known as 'Jack the Ripper'.
Piece
Technical introduction to the application of digital signal processing of speech...
Catalogue reference: HO 377/358
What’s it about?
This record is about the Technical introduction to the application of digital signal processing of speech... dating from 1980 in the series Home Office: Police Research and Planning Branch and successors: Reports. It is held at The National Archives, Kew.
Is it available online?
No, this record is not available online. However, you can order a copy. Other ways to view it.
Can I see it in person?
Yes, this record is held at The National Archives and is available to see in person. How to view it.
Full description and record details
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Reference (The unique identifier to the record described, used to order and refer to it)
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HO 377/358
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Date (When the record was created)
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1980
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Description (What the record is about)
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Technical introduction to the application of digital signal processing of speech for police use
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Held by (Who holds the record)
- The National Archives, Kew
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Former department reference (Former identifier given by the originating creator)
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32/80
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Legal status (A note as to whether the record being described is a Public Record or not)
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Public Record(s)
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Access conditions (Information on conditions that restrict or affect access to the record)
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Closed Until 2005
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Closure status (Whether the record is ‘open’ (available to the public) or ‘closed’ (not available due to a legal exemption))
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Open Document, Open Description
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Subjects (Categories and themes found in our collection (our subject list is under development, and some records may have no subjects or fewer than expected))
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- Topics
- Policing
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Record URL
- https://beta.nationalarchives.gov.uk/catalogue/id/C1384992/
How to order it
- View this record page in our current catalogue
- Check viewing and downloading options
- Select an option and follow instructions
Series information
HO 377
Home Office: Police Research and Planning Branch and successors: Reports
See the series level description for more information about this record.
Catalogue hierarchy
Over 27 million records
This record is held at The National Archives, Kew
1,719,919 records
Within the department: HO
Records created or inherited by the Home Office, Ministry of Home Security, and related...
378 records
Within the series: HO 377
Home Office: Police Research and Planning Branch and successors: Reports
You are currently looking at the piece: HO 377/358
Technical introduction to the application of digital signal processing of speech...
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