Phone log

A phone log is metadata collected from telephone or mobile phones for the purpose of surveillance or espionage. This metadata may include: length of calls, phone numbers of both parties, phone-specific identification information, gps location, call proximity, and/or computer converted voice-to-text transcripts of the phone call conversation. The advantage of converting audio to ASCII text metadata is that it makes it easily searchable for keywords and phrases, and is easily storable for long periods of time on conventional database systems for years. Phone logs are not limited to governmental collection. For example, some private sector companies, such as banks, are known to collect phone log data on their internal phone network of all calls within and between the company and outside parties.

DICE is a known governmental phone log database maintained by the DEA consisting largely of phone log and Internet data gathered legally by the DEA through subpoenas, arrests and search warrants nationwide. DICE includes about 1 billion records, and they are kept for about a year and then purged

Log

Log, LOG, or LoG may refer to:

Recordkeeping

Places

Russia

Slovenia

Data logger

A data logger (also datalogger or data recorder) is an electronic device that records data over time or in relation to location either with a built in instrument or sensor or via external instruments and sensors. Increasingly, but not entirely, they are based on a digital processor (or computer). They generally are small, battery powered, portable, and equipped with a microprocessor, internal memory for data storage, and sensors. Some data loggers interface with a personal computer, and use software to activate the data logger and view and analyze the collected data, while others have a local interface device (keypad, LCD) and can be used as a stand-alone device.

Data loggers vary between general purpose types for a range of measurement applications to very specific devices for measuring in one environment or application type only. It is common for general purpose types to be programmable; however, many remain as static machines with only a limited number or no changeable parameters. Electronic data loggers have replaced chart recorders in many applications.

Logarithm

In mathematics, the logarithm is the inverse operation to exponentiation. That means the logarithm of a number is the exponent to which another fixed value, the base, must be raised to produce that number. In simple cases the logarithm counts repeated multiplication. For example, the base 10 logarithm of 1000 is 3, as 10 to the power 3 is 1000 (1000 = 10 × 10 × 10 = 10³); the multiplication is repeated three times. More generally, exponentiation allows any positive real number to be raised to any real power, always producing a positive result, so the logarithm can be calculated for any two positive real numbers b and x where b is not equal to 1. The logarithm of x to base b, denoted log_b(x), is the unique real number y such that

For example, as 64 = 2⁶, we have

The logarithm to base 10 (that is b = 10) is called the common logarithm and has many applications in science and engineering. The natural logarithm has the number e (≈ 2.718) as its base; its use is widespread in mathematics and physics, because of its simpler derivative. The binary logarithm uses base 2 (that is b = 2) and is commonly used in computer science.