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General sound map

Recordings of background atmospheres and incidental noises from all over London. Some form part of a sound grid series recorded at evenly-spaced points across the city, each marking the centre of a square on the map below.

1 3 5
2 4 3 3 11
1 1 1 1 6 5 7 16 21 3 18 1 1
2 8 22 11 3 5 5 17 5 4 2 1 4 1  
3 11 4 7 9 6 25 39 21 38 8 1 5    
1 3 5 7 5 48 42 56 38 11 8 3 2
1 1 2 7 6 15 8 40 15 5 1 1 4
1 1 41 2 8 4 1 9 7 1 1
3 4 3 7 1 3 5 2  
6 1 20 6 1 3 1 1
1 1 2 1 1
1 1

Above: graphic based on a daytime satellite image courtesy of the Image Science and Analysis Laboratory, NASA Johnson Space Center. Each red grid square is 2.5 miles or 4 kilometers across.

Chaffinch Brook Clock House 1:00

Grid square: Penge, South Norwood, Beckenham

Recording date: 14 September 2011

Time of day: 4.10pm

Location: Hampden Road, Clock House.

Description: The Chaffinch Brook flows from under a residential street, a siren sounds in the distance, knocking sounds from a man repairing a roof nearby.

Technical guff: Headworn stereo. 2 x DPA 2006C mics, Sound Devices MixPre-D preamp, Sony PCM M10 recorder.

Recorded by: IM Rawes

Additional notes: None.

Chaffinch Brook Elmers End 1:00

Grid square: Penge, South Norwood, Beckenham

Recording date: 14 September 2011

Time of day: 4.40pm

Location: Clock House Road, Elmers End.

Description: Airplane drone, sound of the Chaffinch Brook flowing beneath a small bridge, voices of men loading a van, a car passes by.

Technical guff: Headworn stereo. 2 x DPA 2006C mics, Sound Devices MixPre-D preamp, Sony PCM M10 recorder.

Recorded by: IM Rawes

Additional notes: None.

TQ 3627 6930 1:00

Grid square: Penge, South Norwood, Beckenham

Recording date: 20 February

Time of day: 2.15pm

Location: TQ 3627 6930. The far end of the platform at Clockhouse station.

Description: A train leaves Clockhouse station, heading north. Aircraft drone and birdsong.

Technical guff: Head-worn stereo. 2 x Shure WL-183 mics. Olympus LS-10 digital recorder.

Recorded by: IM Rawes

Additional notes: None.

About general sound map recordings

The majority of recordings on the general sound map are simply of curious or distinctive sounds heard around London. Some also appear elsewhere as part of the 12 Tones of London statistical recording project, and here are subsumed into their appropriate grid squares.

These kinds of recordings always have descriptive file names which don't require any further explanation. But just over a hundred others have ones consisting only of the letters 'TQ' followed by eight digits. These are the Ordnance Survey co-ordinates marking the exact centre of each of the sound map's 112 grid squares, and so these file names tell you with some precision where the recordings were made. Reaching each point was done with the help of a GPS receiver and a willingness to scramble over fences and run onto golf courses. The contents of those recordings are summarised in the graphic below:

The key on the left-hand side shows the most common sound categories encountered. The louder a particular sound type encountered at the centre of a grid square, the darker its icon. More than one icon of the same kind means that sound takes up more of the recording's length. Despite the wide spacing of the recording points and the brief duration of the sound files, they seem to do a reasonable job of plotting in outline the common or persistent sound types heard around London during the daytime.