What Causes Black Gums?

Vinyl records were the dominant music format in the 20th century. From your 78-year-old grandmother to a 45-year-old single, vinyl is perfect for all ages because it sounds more fidelity and cheaper. Although vinyl is still used by DJs and radio stations, they have been downgraded to handles in the garage. Vinyl, also known as LP, long play, is a dense black celluloid texture record.

Vinyl Records

Vinyl records were the dominant music format in the 20th century. From your 78-year-old grandmother to a 45-year-old single, vinyl is perfect for all ages because it sounds more fidelity and cheaper. Although vinyl is still used by DJs and radio stations, they have been downgraded to handles in the garage. Vinyl, also known as LP, long play, is

Beginning in 1948, 33 and one-third records were released. After several years of development, the single-side recordable time is nearly 22 minutes, which is much longer than before. In contrast, according to the original state of technology, there is a so-called "SP", or Standard-Playing, which is 78 revolutions per minute. The current records are almost 33 rpm, so vinyl records are directly called "LP".

10 inches: short recording time, usually only one song

12-inch: Long recording time, up to 50 minutes, also standard for stereo LP

33 and a third turn: LP dense record, about 6 songs can be recorded on each side

45 turns: EP single disc, only one song can be recorded per side

78 turns: SP rough record, each side can record about 4 minutes

As a carrier of sound and music, vinyl records occupied almost the entire 20th century, until the birth of the CD in 1984. China entered the CD in 1992

CD adopts binary digital 01 recording method, which determines that the content of the recording is essentially different from that of the analog recording. Compared with the master tape, the lack of information in any recording is inevitable. Just like a model and her portrait, even if the painting skills are real, they are just like the real thing, not the same thing.

The vinyl basically uses an analog recording format, which is consistent with the content recorded by the analog recording master tape. The difference lies in the loss of the master tape and equipment transmission during the transcription process. Just as the same person poses the same pose at different times, it is a true recurrence.

The replacement of vinyl by CD is the law of business and society. The cost of producing CDs is estimated to be a few cents of plastic, and transportation accounts for a small volume. It can be sold for dozens of yuan, and it will not jumper if you sing a disc. The amazing profits and the consumer's acceptability and affordability are both It is obvious. The mass production of light-pressed copper molds with vinyl has already cost a few yuan per disc. The cost of polyethylene raw materials has not been calculated. The transportation is heavy and takes up space. It is easy to lose and it is easy to wear jumpers. If it is Yuan, I am afraid that the profit is not big and consumers are not willing to buy. In contrast, vinyl is bound to be replaced by CD in the mainstream market.

Playing with LP requires patience, because listening to LP has a lot of preparation time and is very troublesome. LP will force you to slow down the pace of life, to listen to one by one, not as convenient as CD selection, so they will listen to the music carefully. The fun of playing LP vinyl records,

1. Is the vinyl record necessarily black?

Vinyl records, also commonly known as "bakelite records". The reason why people call it a vinyl record is that most of the bakelite records are black, but there are also vinyl records in other colors, such as yellow, transparent, fluorescent, white, and you can also print the singer's photos on Records, but the cost is higher. such as,

Short recording time. Since the recording time on a single side is only about 5 minutes, a "Warsaw Concerto" requires two sides of a full 12-inch SP to record, and the Beethoven Fifth Piano Concerto (Emperor) conducted by Walter requires 4 SP. A single SP record is heavier than an LP, and the number of records required for the same recording time makes the SP particularly bulky and difficult to carry. Rough records are very brittle and easily damaged. Rough record fidelity is much worse than dense record, the signal-to-noise ratio is low, and the low-frequency and high-frequency frequency response is poor ^[1] . Therefore, coarse-grained records were quickly eliminated since the appearance of dense-grained records, and were basically replaced by dense-grained records in the 1950s.