问题 单项选择题

在获取与处理音频信号的过程中,正确的处理顺序是()。

A.采样、量化、编码、存储、解码、D/A变换

B.量化、采样、编码、存储、解码、A/D变换

C.编码、采样、量化、存储、解码、A/D变换

D.采样、编码、存储、解码、量化、D/A变换

答案

参考答案:A

解析:

[分析]:

本题考查音频信号的数字化处理过程。

音频信号处理过程主要包括,音频信号获取、处理和输出过程。音频信号获取主要是声音信号的数字化过程,主要步骤包括采样、量化和编码。采杆过程就是把时间连续的模拟信号转换成时间离散、幅度连续的信号:量化处理就是把采样得到的信号幅度转换成数字值,量化后的样本是用二进制数来表示的。为了便于计算机的存储,处理和传输,还要对数字信号进行编码,即选择压缩算法对它进行数据压缩,减少数据量,再按照某种规定的格式将数据组织成文件。

在播放数字声音的过程中,首先需要进行解码过程,即读取特定的文件格式,对压缩数据进行解压缩,形成二进制数据。需要播放声音时,再将二进制数字数据通过数字/模拟变换转换成模拟信号产生声音。

选择题
填空题

B The Beatles甲壳虫乐队
The English rock music group The Beatles gave the 1960s its characteristic musical flavor and (1) a profound influence on the course of popular music, equaled by (2) performers. The guitarists John Winston Lennon, James Paul McCartney, and George Harrison; and the drummer Ringo Starr, were all born and (3) in Liverpool. Lennon and McCartney had played together in a group called The Quarrymen. With Harrison, (4) formed their own group, The Silver Beatles, in 1959, and Starr joined them in 1962. As (5) Beatles, they developed a local following in Liverpool clubs, and their first recordings, "Love Me Do" (1962) and "Please Please Me" (1963), quickly made them Britain’s top rock group. Their early music was (6) by the American rock singers Chuck Berry and Elvis Presley, but they infused a hackneyed musical (7) with freshness, vitality, and wit.
The release of "I Want to Hold Your Hand" in 1964 (8) the beginning of the phenomenon known as"Beatlemania" in the United States. The Beatle’s first US (9) aroused a universal mob adulation. Their concerts were scenes of mass worship, and their records sold (10) the millions. Their first film, the innovative A Hard Day’s Night(1964), was received enthusiastically (11) a wide audience that included many who had never before listened to rock music.
Composing their own (12) , The Beatles established the precedent for other rock groups to play their own music.Experimenting with (13) musical forms, they produced an extraordinary (14) of songs: the childishly simple "Yellow Submarine" ; the bitter social commentary of "Eleanor Rigby" ; parodies of earlier pop styles; new electronic sounds; and compositions that were scored for cellos, violins, trumpets, and sitars, as well as for conventional guitars and drums. The (15) disbanded in 1970, after the release of their final album, Let It Be, and during the 1970s (16) individual careers, On dec.8, 1980, John Lennon (17) fatally shot outside his Manhattan apartment by Mark Chapman, a 25-year-old former mental (18) who, earlier that same day, had asked Lennon for his (19) . Lennon’s murder was universally (20) with an intensity of feeling usually inspired only by political and spiritual leaders.