分頻點問題

mankit9998

呢編野真係有用Very good!
- 發送自我的 iPhone 大板凳應用

ming2002

冇錯!!!
avlam 發表於 2011-6-10 14:41

    ching,
分频set 80, 我理解係80hz以下会交由十仔處理，其他喇叭唔会發声。
所以如果訊號係90hz, 只會其他喇叭發声，十仔係唔会發声的。

有错請指正

Big_McIn

ching,
分频set 80, 我理解係80hz以下会交由十仔處理，其他喇叭唔会發声。
所以如果訊號係90hz, 只 ...
ming2002 發表於 2011-6-11 01:01

「如果我兩個前置分頻點set 80hz, subwoofer set 100hz
咁如果我播D 90hz 既音頻，係咪前置同subwoofer都會同時出聲呢？」


前置分頻點是Hign Pass Filter(HPF)，而Sub 分頻點主要是Low Pass Filter(LPF)。

HPF: 該點以上音頻通過。

LPF: 該點以下音頻通過。

ming2002

ic. 我以為係講緊amp嘅subwoofer LPF crossover同埋subwoofer本身crossover.
多謝提點

狐滴hp2210

其實大家會唔會誤會LFE=WOOFER ?
LFE其實=0.1聲道
http://www.post76.com/discuss/vi ... &extra=page%3D2

dominickwok

其實大家會唔會誤會LFE=WOOFER ?
LFE其實=0.1聲道
HP2210 發表於 2011-6-11 14:23

True.  That's the cause of mis-understanding and confusion.

Take Onkyo as example, if "Front" set 80Hz (THX), "Center" set 100Hz, "Surround" set 80Hz (THX), "LPF of LFE" set 80Hz (THX), then for 5.1 channel audio signal, the subwoofer (meaning the SUB output in the Onkyo) will be sent with the bass signal which is the sum of:

Subwoofer = Front Left (<80Hz) + Front Right (<80Hz) + Center (<100Hz) + Surr Left (<80Hz) + Surr Right (<80Hz) + 0.1 LFE (<80Hz)

Although the 0.1 channel in DVD/Blu-ray can theoretically store up to 120Hz (that the specification says) - but in real situation no freq (or very very little) above 80Hz is encoded in the 0.1 channel.  So set the cutoff at 80Hz for LFE is perfectly ok.