Specialist in Acoustic Components
How to choose the microphone 如何選用麥克風
Directional:
According to the sound receiving range, the microphone is divided into
omnidirectional, unidirectional, and noise canceling. The noise canceling
microphone is designed to decay the low frequency far. Most customers
use omnidirectional microphone; the unidirectional is only used in some
special occasions, therefore we should pay more attention to mechanical
and circuit design.
Sensitivity: The sensitivity
of the microphone affects the recorded volume. However, high sensitivity
doesn’t mean a good microphone. The good circuit design is also necessary
for getting better results. We suggest selecting a middle common sensitivity
at beginning. Too high or too low might affect the lead time and the price.
Test condition:
The test voltage and the impedance affect the sensitivity of the microphone.
Generally speaking, the higher the voltage and the impedance is the better
sensitivity we get. Therefore, the test condition is for reference and
IQC only, which is usually different to the reality.
Dimension: Diameter is from 2mm to 14mm, height is from 1.1mm to 6.7mm.
4*1.5, 6*2.2, 6*2.7, 6*5.0, 9.7mm are common spec.
Connecting way: pin, solder pad, SMD, and contact. Due to the diaphragm
is easily damaged by high temp. during soldering, therefore we suggest
finishing the wires and test the microphone again by us to confirm the
stability of quality.
指向性 : j麥克風根據不同的收音角度,可分為全指向,單指向的,另外還有抗噪型的,是針對遠距離的低頻加以衰減, 大部份的客戶都是用全指向的麥克風,只有特殊的場合才有需要用到指向性的麥克風,在機構及線路設計上也有更多需要注意的地方.
靈敏度 : 麥克風的靈敏度會影響到錄音的音量, 但並不是靈敏度高就是好的麥克風,還是需要配合線路上的設計來取得最好的效果,一開始最好先選用中間,常用的靈敏度,太高太低的可能會影響到交期及價格.
測試條件 : 測試的電壓, 匹配阻抗都會影響到麥克風的靈敏度, 一般而言,電壓愈高,阻抗愈高,靈敏度都會變好. 故標準測試條件是供參考或是收料時的驗收用,與實際在使用時常常會不同.
尺寸 : 最小有2mm,最大到14mm, 最薄1.1,最厚到6.7mm, 常用的是4*1.5, 6*2.2, 6*2.7, 6*5.0, 9.7mm的.
連結方式 : 有pin, solder pad, SMD,及contact的, 由於麥克風的膜片容易被焊接時的高溫損傷,故建議由我們為客戶加工線材,並再測試一次,以確定品質的穩定.
料號說明 : AMB-O60F42-NWH
A = AATC
M = Microphone
B= Back type 背極式, F = Foil type 振膜式, 背極式的穩定度,低頻響應比較好,但價格也會高一些
B= Back type, F = Foil type, comparing with foil type, the back type is
steadier and has better low frequency response, the price will be also
higher.
O = Omnidirectional 全指向, U = Unidirectional 單指向, N = Noise cancelling
抗噪型麥克風
O = Omnidirectional, U = Unidirectional, N = Noise cancelling
60 = Diameter 6.0mm, 97=9.7mm
F = Height 2.7mm, G = 2.2mm, H = 1.5mm, C=5.0mm
42 = Sensitivity -42dB,
N= No capacitance, A = Add one capacitance10p, B= 33p, C= 10+33p,
W = Wire, A= Soldering, B=PIN, C=Contact,
H = Rubber Holder加橡膠套