Ambient Noise Database CD-ROM

The database is recorded on CD-ROM disks.
Each disk is divided into two areas, audio and data.
The signals in the audio area can be reproduced by a commercial CD player.
The signals in the data area can be read by a PC.
The noise recordings were performed using 4 separate microphones and 4 digital channel recorders.
These CD-ROMs provide better sensation of reality than conventional commercial CD titles for sound effects.

Price

Remarks:
In any case, these prices are applied to an overseas mailing address. The delivery charge is included. Clients are requested to pay their domestic tax or custom duty by themselves.

1. Same recording conditions in three regions in the world
   Japan, Europe (UK, France, Germany, Italy), USA
   Recording conditions:
   3-minute.duration for each of 268 ambient conditions.
2. Wide variety of noise conditions
   • Inside cars (differences including driving on a high way, city street, with open/closed window, in fine/rainy weather)13 different cars, plus multi-purpose vehicles, mini-Vans, trucks, buses.
   • Inside trains (including high-speed trains, local trains, commutertrains, subways).
   • Inside aircraft and ferry boats
   • On sidewalks, construction sites, in factories.
   • In offices, restaurants, shopping malls.
   • In amusement arcades, amusement parks, on train station platforms, in sports facilities.
   • In car parks, under railroad bridges, in hotel lobbies and airports.
3. High quality recording by digital recorder and editor
   • 4-channel digital recorder
   • Professional uni-directional microphones
   • Editing by digital facilities
4. Four-channel reproduction by a commercial CD player with special adaptor.
   • Signals in the audio area are used for evaluating test objects in a sound field reproduced by loud speakers.
   • Sampling rate (22.05kHz) is half of regular CD. Fifteen bits are allocated to the signal and the remaining one bit(LSB) is used for identifying front or rear.

   Remarks

   1. Although seemingly normal sound may be produced when the CD-ROM disks are played with a regular 2 channel stereo player without using the adaptor, the sound is incorrect. Be sure to use the adaptor, which is sold separately.
   2. Regular CD disks cannot be played through the adaptor.

5. PC readable
   • In the data area are monaural noise signals which are generated by mixing the four channels. Such formats of noise may be used to evaluate the effect of noise on speech processing equipment.The normalized average power level facilitates adjustment of the S/N.
   • Data are recorded by ISO 9660 format.
   • Data is digitized at 8kHz sampling rate with linear PCM.

   Remarks:
   Only the fifteen bits from MSB within a 16-bit data is valid .

6. User's guide with photographic view of recording is attached.
   In the guide, the main components of noise sources, and compensation signal levels to reference tones are indicated.
7. 4-CH CD Adaptor Option
   Input: Digital Audio Interface conforming to IEC958 Standard (either optical or coaxial (RCA type pin jack) is selectable by switch)
   Output: Analog 4-channel signals (RCA type pin jack)

   Remarks:
   The adaptor can be used only on a CD player with a digital audio interface.