【 Weak current College 】 public broadcasting system terminology---Power By 【 China power house network 】

Sensitivity: microphone acoustic electric conversion efficiency.

Frequency response: is the microphone output and frequency, it refers to the microphone in a frame set sound pressure, the different frequencies of the measured value of the output voltage change.

Directivity: microphone directivity is one finger at a given frequency, microphone in one direction (2) of the sensitivity and maximum sensitivity (O f) ratio.
CD: CD is the Compactdisc's initials: usually refers to a method using laser pick up sound signal of small digital audio recording system
CD--ROM CD: computer software records in a particular format to a CD disc.

CD--V CD: is recorded music and some static picture disc, also known as graphic CDs.

CD-V CD: in addition to recording a CD disc the same audio signal, there are 5MIN image signal.

CD-I discs: is a kind of interaction or CD, or interactive CD disc. Recording on the disc information exchange with the user.

CD--R to CD: a one-time recording CDs, also known as append the records of CDs, available to users of a blank disc. Users can use the disc recorded video or graphic information, one-time records cannot be erased, as a permanent record.

MD CD: is a magneto-optical disk, can be repeated recording and playback. Straight through to 64mm. Recording above plus magnetic field, the following combined with laser beam. There are information read from top to bottom.

MPEG: digital sound and image compression technology.

Peak output power music (PMPO): means not calculate the distortion of the conditions, the amplifier's volume and pitch of the Telecom regulator temple to largest, the amplifier's output for maximum music power.

Reverberation time: measuring million to the sound quality is an important parameter, the length of listening to the auditorium has a significant effect, which is defined as: steady state is reached after the audible sound field. Sound attenuation 60dB. The experience of time credited (60) seconds.

Maximum pressure level: refers to sound reinforcement systems in Hall audience seats, a maximum steady-state of quasi peak sound pressure level. The so-called quasi peak sound pressure level is for non-harmonic wave sound and it has the same steady harmonic signal peak sound pressure are valid representation of the sound pressure level.

Transmission frequency: sound reinforcement systems meet the highest Hall with gain, the audience of the steady state sound pressure at average relative to sound reinforcement system microphone, sound pressure, or sound reinforcement device input voltage amplitude-frequency response.

Highest available gain: amplification system in the halls within the sound you fed self-excited critical gain when subtracting 6dB gain.

Acoustic gain: refers to sound reinforcement systems meet the highest available gain, the audience seats in the Auditorium at steady state sound pressure level averaged sound reinforcement system microphone and sound pressure level difference.

Sound field not uniformity: is there sound reinforcement in Li Tong, the audience seats obtained steady state sound pressure level difference.

Haas effect: listeners only took note of the first to reach the sound direction, but ignored successive arrived a short time delay sound direction, that is within the reach of 30ms commonly voice will sound and the first, this phenomenon is the "Haas effect"