yz2022/T2P-DownstreamNLP huggingface dataset:
MP3

Karlheinz Brandenburg used a CD recording of Suzanne Vega's song "Tom's Diner" to assess and refine the MP3 compression algorithm. This song was chosen because of its nearly monophonic nature and wide spectral content, making it easier to hear imperfections in the compression format during playbacks. Some refer to Suzanne Vega as "The mother of MP3". This particular track has an interesting property in that the two channels are almost, but not completely, the same, leading to a case where Binaural Masking Level Depression causes spatial unmasking of noise artifacts unless the encoder properly recognizes the situation and applies corrections similar to those detailed in the MPEG-2 AAC psychoacoustic model. Some more critical audio excerpts (glockenspiel, triangle, accordion, etc.) were taken from the EBU V3/SQAM reference compact disc and have been used by professional sound engineers to assess the subjective quality of the MPEG Audio formats.

Question: What word describes the nature of the song used?
Answer: monophonic
MP3

A working group consisting of Leon van de Kerkhof (The Netherlands), Gerhard Stoll (Germany), Leonardo Chiariglione (Italy), Yves-François Dehery (France), Karlheinz Brandenburg (Germany) and James D. Johnston (USA) took ideas from ASPEC, integrated the filter bank from Layer 2, added some of their own ideas and created MP3, which was designed to achieve the same quality at 128 kbit/s as MP2 at 192 kbit/s.

Question: What quality were they hoping to match at 128 kbit/s?
Answer: MP2 at 192 kbit/s
MP3

Karlheinz Brandenburg used a CD recording of Suzanne Vega's song "Tom's Diner" to assess and refine the MP3 compression algorithm. This song was chosen because of its nearly monophonic nature and wide spectral content, making it easier to hear imperfections in the compression format during playbacks. Some refer to Suzanne Vega as "The mother of MP3". This particular track has an interesting property in that the two channels are almost, but not completely, the same, leading to a case where Binaural Masking Level Depression causes spatial unmasking of noise artifacts unless the encoder properly recognizes the situation and applies corrections similar to those detailed in the MPEG-2 AAC psychoacoustic model. Some more critical audio excerpts (glockenspiel, triangle, accordion, etc.) were taken from the EBU V3/SQAM reference compact disc and have been used by professional sound engineers to assess the subjective quality of the MPEG Audio formats.

Question: What type of recording did Brandenburg use?
Answer: CD

Question: Excerpts were taken from which reference compact disc to assess the subjective quality of the MPEG audio formats?
Answer: EBU V3/SQAM
MP3

During encoding, 576 time-domain samples are taken and are transformed to 576 frequency-domain samples.[clarification needed] If there is a transient, 192 samples are taken instead of 576. This is done to limit the temporal spread of quantization noise accompanying the transient. (See psychoacoustics.)

Question: When are 192 samples taken instead of 576?
Answer: there is a transient

Question: What accompanies a transient?
Answer: quantization noise

Question: When 192 samples are taken instead of 576, it is done in an effort to limit what?
Answer: temporal spread
MP3

The MPEG-1 standard does not include a precise specification for an MP3 encoder, but does provide example psychoacoustic models, rate loop, and the like in the non-normative part of the original standard. At present, these suggested implementations are quite dated. Implementers of the standard were supposed to devise their own algorithms suitable for removing parts of the information from the audio input. As a result, there are many different MP3 encoders available, each producing files of differing quality. Comparisons are widely available, so it is easy for a prospective user of an encoder to research the best choice. An encoder that is proficient at encoding at higher bit rates (such as LAME) is not necessarily as good at lower bit rates.

Question: It is easy for a prospective user of an encoder to research the best choice because of what factor?
Answer: Comparisons are widely available
MP3

On 7 July 1994, the Fraunhofer Society released the first software MP3 encoder called l3enc. The filename extension .mp3 was chosen by the Fraunhofer team on 14 July 1995 (previously, the files had been named .bit). With the first real-time software MP3 player WinPlay3 (released 9 September 1995) many people were able to encode and play back MP3 files on their PCs. Because of the relatively small hard drives back in that time (~ 500–1000 MB) lossy compression was essential to store non-instrument based (see tracker and MIDI) music for playback on computer.

Question: What was the name of the first software MP3 encoder?
Answer: l3enc
MP3

A working group consisting of Leon van de Kerkhof (The Netherlands), Gerhard Stoll (Germany), Leonardo Chiariglione (Italy), Yves-François Dehery (France), Karlheinz Brandenburg (Germany) and James D. Johnston (USA) took ideas from ASPEC, integrated the filter bank from Layer 2, added some of their own ideas and created MP3, which was designed to achieve the same quality at 128 kbit/s as MP2 at 192 kbit/s.

Question: What did the working group eventually create?
Answer: MP3
MP3

On 7 July 1994, the Fraunhofer Society released the first software MP3 encoder called l3enc. The filename extension .mp3 was chosen by the Fraunhofer team on 14 July 1995 (previously, the files had been named .bit). With the first real-time software MP3 player WinPlay3 (released 9 September 1995) many people were able to encode and play back MP3 files on their PCs. Because of the relatively small hard drives back in that time (~ 500–1000 MB) lossy compression was essential to store non-instrument based (see tracker and MIDI) music for playback on computer.

Question: What was the name of the first real-time software MP3 player?
Answer: WinPlay3

Question: What was the average high end hard drive size?
Answer: 1000 MB

Question: What was the filename extension?
Answer: .mp3
MP3

Decoding, on the other hand, is carefully defined in the standard. Most decoders are "bitstream compliant", which means that the decompressed output that they produce from a given MP3 file will be the same, within a specified degree of rounding tolerance, as the output specified mathematically in the ISO/IEC high standard document (ISO/IEC 11172-3). Therefore, comparison of decoders is usually based on how computationally efficient they are (i.e., how much memory or CPU time they use in the decoding process).

Question: What is carefully defined in the standard?
Answer: Decoding

Question: Decoders are usually compared by examining which factor?
Answer: computationally efficient
MP3

A test given to new students by Stanford University Music Professor Jonathan Berger showed that student preference for MP3-quality music has risen each year. Berger said the students seem to prefer the 'sizzle' sounds that MP3s bring to music.

Question: Who gave students a test to determine their preferences?
Answer: Music Professor Jonathan Berger
MP3

On 7 July 1994, the Fraunhofer Society released the first software MP3 encoder called l3enc. The filename extension .mp3 was chosen by the Fraunhofer team on 14 July 1995 (previously, the files had been named .bit). With the first real-time software MP3 player WinPlay3 (released 9 September 1995) many people were able to encode and play back MP3 files on their PCs. Because of the relatively small hard drives back in that time (~ 500–1000 MB) lossy compression was essential to store non-instrument based (see tracker and MIDI) music for playback on computer.

Question: When was the first software MP3 encoder released?
Answer: 7 July 1994
MP3

Decoding, on the other hand, is carefully defined in the standard. Most decoders are "bitstream compliant", which means that the decompressed output that they produce from a given MP3 file will be the same, within a specified degree of rounding tolerance, as the output specified mathematically in the ISO/IEC high standard document (ISO/IEC 11172-3). Therefore, comparison of decoders is usually based on how computationally efficient they are (i.e., how much memory or CPU time they use in the decoding process).

Question: What are most decoders?
Answer: bitstream compliant
MP3

Besides the bit rate of an encoded piece of audio, the quality of MP3 files also depends on the quality of the encoder itself, and the difficulty of the signal being encoded. As the MP3 standard allows quite a bit of freedom with encoding algorithms, different encoders may feature quite different quality, even with identical bit rates. As an example, in a public listening test featuring two different MP3 encoders at about 128 kbit/s, one scored 3.66 on a 1–5 scale, while the other scored only 2.22.

Question: As a result of the freedom, different encoders can result in different quality even if which aspect of the file is the same?
Answer: bit rates

Question: The MP3 standard allows encoders to have a lot of freedom with which aspect of encoding?
Answer: encoding algorithms

Question: Other than the bit rate and the difficulty of the signal, what can also affect the quality of an MP3 file?
Answer: quality of the encoder

Question: An example shown has a low range quality score of what value?
Answer: 2.22

Question: To compare qualities, sound files are evaluated on a scale that ranges from 1 to what?
Answer: 5
MP3

Decoding, on the other hand, is carefully defined in the standard. Most decoders are "bitstream compliant", which means that the decompressed output that they produce from a given MP3 file will be the same, within a specified degree of rounding tolerance, as the output specified mathematically in the ISO/IEC high standard document (ISO/IEC 11172-3). Therefore, comparison of decoders is usually based on how computationally efficient they are (i.e., how much memory or CPU time they use in the decoding process).

Question: The ISO/IEC high standard document states that the decompressed output produced from a given MP3 file will be the same within what standards?
Answer: specified degree of rounding tolerance

Question: The efficiency of decoders is examined by seeing how much memory and what other process they use in the decoding process?
Answer: CPU time
MP3

During encoding, 576 time-domain samples are taken and are transformed to 576 frequency-domain samples.[clarification needed] If there is a transient, 192 samples are taken instead of 576. This is done to limit the temporal spread of quantization noise accompanying the transient. (See psychoacoustics.)

Question: How many domain samples are taken during encoding?
Answer: 576
MP3

A test given to new students by Stanford University Music Professor Jonathan Berger showed that student preference for MP3-quality music has risen each year. Berger said the students seem to prefer the 'sizzle' sounds that MP3s bring to music.

Question: Where was a test performed to collect data on student preference for MP3 quality?
Answer: Stanford University

Question: Data showed that students' preference for MP3 quality music followed which trend?
Answer: risen each year

Question: What kind of sound did students seem to prefer?
Answer: sizzle
MP3

In the second half of '90s, MP3 files began to spread on the Internet. The popularity of MP3s began to rise rapidly with the advent of Nullsoft's audio player Winamp, released in 1997. In 1998, the first portable solid state digital audio player MPMan, developed by SaeHan Information Systems which is headquartered in Seoul, South Korea, was released and the Rio PMP300 was sold afterwards in 1998, despite legal suppression efforts by the RIAA.

Question: Where did MP3s begin to spread?
Answer: the Internet

Question: Which audio player was released in 1997?
Answer: Winamp
MP3

However, several de facto standards for tag formats exist. As of 2010, the most widespread are ID3v1 and ID3v2, and the more recently introduced APEv2. These tags are normally embedded at the beginning or end of MP3 files, separate from the actual MP3 frame data. MP3 decoders either extract information from the tags, or just treat them as ignorable, non-MP3 junk data.

Question: What is the most recently introduced standard for tag formatting?
Answer: APEv2
MP3

In the second half of '90s, MP3 files began to spread on the Internet. The popularity of MP3s began to rise rapidly with the advent of Nullsoft's audio player Winamp, released in 1997. In 1998, the first portable solid state digital audio player MPMan, developed by SaeHan Information Systems which is headquartered in Seoul, South Korea, was released and the Rio PMP300 was sold afterwards in 1998, despite legal suppression efforts by the RIAA.

Question: Who released the audio player?
Answer: Nullsoft
MP3

However, several de facto standards for tag formats exist. As of 2010, the most widespread are ID3v1 and ID3v2, and the more recently introduced APEv2. These tags are normally embedded at the beginning or end of MP3 files, separate from the actual MP3 frame data. MP3 decoders either extract information from the tags, or just treat them as ignorable, non-MP3 junk data.

Question: If the MP3 decoders do not extract information from the tags, what do they do to them?
Answer: treat them as ignorable, non-MP3 junk data

Question: What is important to note about where the tags are stored?
Answer: separate from the actual MP3 frame data

Question: What is the second place in a file that tags are normally stored, with the first being at the beginning?
Answer: end
MP3

In the second half of '90s, MP3 files began to spread on the Internet. The popularity of MP3s began to rise rapidly with the advent of Nullsoft's audio player Winamp, released in 1997. In 1998, the first portable solid state digital audio player MPMan, developed by SaeHan Information Systems which is headquartered in Seoul, South Korea, was released and the Rio PMP300 was sold afterwards in 1998, despite legal suppression efforts by the RIAA.

Question: What was the name of the first portable solid state digital audio player?
Answer: MPMan

Question: In which country was the first portable audio player developed?
Answer: South Korea
MP3

Non-standard bit rates up to 640 kbit/s can be achieved with the LAME encoder and the freeformat option, although few MP3 players can play those files. According to the ISO standard, decoders are only required to be able to decode streams up to 320 kbit/s.

Question: What is the highest bit rate the LAME encoder allows?
Answer: 640 kbit/s

Question: The LAME encoder allows bit rates that are what?
Answer: Non-standard

Question: Even though few MP3 players can play it, LAME also offers which option?
Answer: freeformat
MP3

Unauthorized MP3 file sharing continues on next-generation peer-to-peer networks. Some authorized services, such as Beatport, Bleep, Juno Records, eMusic, Zune Marketplace, Walmart.com, Rhapsody, the recording industry approved re-incarnation of Napster, and Amazon.com sell unrestricted music in the MP3 format.

Question: What kind of MP3 file sharing continues on?
Answer: Unauthorized

Question: Which format is used by the companies that sell the music legally?
Answer: MP3
MP3

ReplayGain is a standard for measuring and storing the loudness of an MP3 file (audio normalization) in its metadata tag, enabling a ReplayGain-compliant player to automatically adjust the overall playback volume for each file. MP3Gain may be used to reversibly modify files based on ReplayGain measurements so that adjusted playback can be achieved on players without ReplayGain capability.

Question: What is measuring and storing loudness of an MP3 file also known as?
Answer: audio normalization
MP3

Non-standard bit rates up to 640 kbit/s can be achieved with the LAME encoder and the freeformat option, although few MP3 players can play those files. According to the ISO standard, decoders are only required to be able to decode streams up to 320 kbit/s.

Question: The ISO standard dictates that decoders only need to be able to decode streams that have how high of a bit rate?
Answer: 320
MP3

A sample rate of 44.1 kHz is almost always used, because this is also used for CD audio, the main source used for creating MP3 files. A greater variety of bit rates are used on the Internet. The rate of 128 kbit/s is commonly used, at a compression ratio of 11:1, offering adequate audio quality in a relatively small space. As Internet bandwidth availability and hard drive sizes have increased, higher bit rates up to 320 kbit/s are widespread.

Question: Where can one find a greater variety of bit rates?
Answer: the Internet

Question: What is the main source used for creating MP3 files?
Answer: CD audio

Question: As technology advances, what is another higher bit rate that is beginning to spread?
Answer: 320 kbit/s

Question: The common bit rate on the internet is 128 kbit/s using which compression ratio?
Answer: 11:1

Question: What sampling rate is used for CD audio?
Answer: 44.1 kHz
MP3

Unauthorized MP3 file sharing continues on next-generation peer-to-peer networks. Some authorized services, such as Beatport, Bleep, Juno Records, eMusic, Zune Marketplace, Walmart.com, Rhapsody, the recording industry approved re-incarnation of Napster, and Amazon.com sell unrestricted music in the MP3 format.

Question: What kind of music is sold by these companies?
Answer: unrestricted

Question: Beatport, Bleep and Juno records are examples of what kind of service?
Answer: authorized
MP3

However, several de facto standards for tag formats exist. As of 2010, the most widespread are ID3v1 and ID3v2, and the more recently introduced APEv2. These tags are normally embedded at the beginning or end of MP3 files, separate from the actual MP3 frame data. MP3 decoders either extract information from the tags, or just treat them as ignorable, non-MP3 junk data.

Question: Other than the ID3v1, which similar standard format for tag exists?
Answer: ID3v2
MP3

ReplayGain is a standard for measuring and storing the loudness of an MP3 file (audio normalization) in its metadata tag, enabling a ReplayGain-compliant player to automatically adjust the overall playback volume for each file. MP3Gain may be used to reversibly modify files based on ReplayGain measurements so that adjusted playback can be achieved on players without ReplayGain capability.

Question: What is the name given to the standard for measure and storing the loudness of an MP3 file?
Answer: ReplayGain

Question: What does the standard ReplayGain allow a player to automatically adjust?
Answer: the overall playback volume

Question: What program can be used to modify files based on ReplayGain measurements?
Answer: MP3Gain

Question: MP3Gain is important because it allows players without what capability to have adjusted playback?
Answer: ReplayGain capability
MP3

The basic MP3 decoding and encoding technology is patent-free in the European Union, all patents having expired there. In the United States, the technology will be substantially patent-free on 31 December 2017 (see below). The majority of MP3 patents expired in the US between 2007 and 2015.

Question: Where is the basic MP3 decoding and technology patent free?
Answer: European Union

Question: When will the technology be patent - free in the United States?
Answer: 31 December 2017

Question: Between which years did most of the MP3 patents in the US expire?
Answer: 2007 and 2015
MP3

An in-depth study of MP3 audio quality, sound artist and composer Ryan Maguire's project "The Ghost in the MP3" isolates the sounds lost during MP3 compression. In 2015, he released the track "moDernisT" (an anagram of "Tom's Diner"), composed exclusively from the sounds deleted during MP3 compression of the song "Tom's Diner", the track originally used in the formulation of the MP3 standard. A detailed account of the techniques used to isolate the sounds deleted during MP3 compression, along with the conceptual motivation for the project, was published in the 2014 Proceedings of the International Computer Music Conference.

Question: What did the study aim to isolate?
Answer: sounds lost during MP3 compression

Question: What is the name of the study done by composer Ryan Maguire?
Answer: The Ghost in the MP3

Question: What is the track "moDernisT" an anagram of?
Answer: Tom's Diner

Question: Where was an account of the study published?
Answer: International Computer Music Conference

Question: Which year was the study published?
Answer: 2014
MP3

The initial near-complete MPEG-1 standard (parts 1, 2 and 3) was publicly available on 6 December 1991 as ISO CD 11172. In most countries, patents cannot be filed after prior art has been made public, and patents expire 20 years after the initial filing date, which can be up to 12 months later for filings in other countries. As a result, patents required to implement MP3 expired in most countries by December 2012, 21 years after the publication of ISO CD 11172.

Question: What became publicly available on 6 December 1991?
Answer: MPEG-1 standard

Question: When can patents not be filed in most countries?
Answer: after prior art has been made public

Question: When did patents required to implement MP3 expire in most countries?
Answer: December 2012
MP3

A reference simulation software implementation, written in the C language and later known as ISO 11172-5, was developed (in 1991–1996) by the members of the ISO MPEG Audio committee in order to produce bit compliant MPEG Audio files (Layer 1, Layer 2, Layer 3). It was approved as a committee draft of ISO/IEC technical report in March 1994 and printed as document CD 11172-5 in April 1994. It was approved as a draft technical report (DTR/DIS) in November 1994, finalized in 1996 and published as international standard ISO/IEC TR 11172-5:1998 in 1998. The reference software in C language was later published as a freely available ISO standard. Working in non-real time on a number of operating systems, it was able to demonstrate the first real time hardware decoding (DSP based) of compressed audio. Some other real time implementation of MPEG Audio encoders were available for the purpose of digital broadcasting (radio DAB, television DVB) towards consumer receivers and set top boxes.

Question: Who developed the reference simulation software?
Answer: the ISO MPEG Audio committee
MP3

The basic MP3 decoding and encoding technology is patent-free in the European Union, all patents having expired there. In the United States, the technology will be substantially patent-free on 31 December 2017 (see below). The majority of MP3 patents expired in the US between 2007 and 2015.

Question: What happened to the patents that caused them to be patent-free?
Answer: expired
MP3

In September 1998, the Fraunhofer Institute sent a letter to several developers of MP3 software stating that a license was required to "distribute and/or sell decoders and/or encoders". The letter claimed that unlicensed products "infringe the patent rights of Fraunhofer and Thomson. To make, sell and/or distribute products using the [MPEG Layer-3] standard and thus our patents, you need to obtain a license under these patents from us."

Question: When did the Fraunhofer institute send out a letter?
Answer: September 1998
MP3

The initial near-complete MPEG-1 standard (parts 1, 2 and 3) was publicly available on 6 December 1991 as ISO CD 11172. In most countries, patents cannot be filed after prior art has been made public, and patents expire 20 years after the initial filing date, which can be up to 12 months later for filings in other countries. As a result, patents required to implement MP3 expired in most countries by December 2012, 21 years after the publication of ISO CD 11172.

Question: How long can it take for patents to be approved after initially being filed?
Answer: 12 months