An AV surround amplifier can measure speaker distance using a process called "speaker distance calibration" or "speaker distance setup." During this setup process, the AV amplifier sends a test signal to each speaker in the surround sound system, and measures the time it takes for the sound to travel from the speaker to the microphone located at the listening position.
The AV amplifier then uses this time measurement to calculate the distance between each speaker and the listening position. By knowing the distance between each speaker and the listening position, the AV amplifier can adjust the audio delay for each speaker to ensure that all sound waves from each speaker arrive at the listening position at the same time. This helps to create a more accurate and immersive surround sound experience.
Some AV amplifiers may use additional methods to measure speaker distance, such as using a tape measure to physically measure the distance between each speaker and the listening position, or using a laser range finder to measure the distance. However, the most common method used by AV amplifiers is the speaker distance calibration process described above.
MDLP 發表於 2023-3-3 03:41
An AV surround amplifier can measure speaker distance using a process called "speaker distance calib ...
實際上收音咪與喇叭之間量度出嚟係用時間做單位
計算個時差都係用時間並非用距離
就算退一萬步
當部avm蠢到
真係用往返時間化返做距離
再用距離化返去計延遲時間
只要兩次轉換保持用同一個聲音速度
無論300或333或者340又或者342
對於個延遲時間結果都係冇影響
MDLP 發表於 2023-3-3 03:48
實際上收音咪與喇叭之間量度出嚟係用時間做單位
計算個時差都係用時間並非用距離
就算退一萬步
傳聞就係話測量同執行係用唔同速度，所以要0.875，係呀，聽落去好似好弱智架，真正佢裏面點計點樣運算你我都唔知架啦，所以叫做傳聞囉。不過又有對應方法，有時間咪試下，又唔使錢，按幾下遙控就得，唔鐘意咪回返原來數值，發燒友最鐘意折騰，咁樣又可以試半日
naviwow 發表於 2023-3-3 07:45
傳聞就係話測量同執行係用唔同速度，所以要0.875，係呀，聽落去好似好弱智架，真正佢裏面點計點樣運算你 ...
咁ching你有冇試到？
本帖最後由 lungaska 於 2023-3-3 08:31 編輯
我係前個月加左後級，先再cal過機，已經覺得正過之前好多，咁好嘢冇人覺得嫌多，所以我又試吓用埋0.875,不過我就覺得啲野炒晒，還原反後正常返，咁我又睇返個denon app，佢依幾個月都有持續更新左啲bug,所以依家用app從新cal過，可能已經改咗個問題，其實我見好多ching都係用返舊嗰個cal數據黎整，有可能之前真係有依個問題，因為其實好多ching如果冇加野我諗一年半載都唔會去cal過機，不過加過野都一定要cal過，我發現有很多ching原來加再新喇叭同後級都冇重新cal機，（因為懶不過其實都幾煩😂），大家不妨又可以更新左個app再cal下😊
naviwow 發表於 2023-3-3 07:45
傳聞就係話測量同執行係用唔同速度，所以要0.875，係呀，聽落去好似好弱智架，真正佢裏面點計點樣運算你 ...
Speed=distance/time
s=d/t
t=d/s
d=t*s
咁即係話部機明明度咗t1出嚟
部機就用t1*300得到個d
跟住又用d/342
得出另一個t2去個delay?
係咪咁樣理解?
pac 發表於 2023-3-2 10:07
認同。
玩兩聲又好，玩多聲道又好，喇叭擺位同樣重要，
尤其是前置喇叭，要搞好前置喇叭在兩聲道在結象上 ...
https://youtu.be/Rx6xP7vo9FY?t=256
MDLP 發表於 2023-3-3 08:51
Speed=distance/time
s=d/t
t=d/s
係呀師兄，計數係咁計囉
測量時得出d1=t x 343m/s
你輸入d1落部機，出聲果下佢用300m/s，咁個delay咪唔同你測量果個囉
例如測出來4m, delay時間係4/343=0.01166s
0.01166 x 300= 3.5m
自己輸入部機距離3.5m
3.5/4=0.875
300/343=0.875
0.875就係咁樣出來
我睇網友懶人包係咁樣總結囉，原post千幾個留言討論我無睇晒啦。想知清楚整個來龍去脈睇原文啦，有人量度數據，結合Audyssey回復去推論出來。
用測量原來個數唔係話唔準，不過0.875完更加準咁解囉，有好多人試過話好左。
愚蠢一問
如果全部声道連超低音都同時間要乘0.875
即是全部距離只是相差0.125， 出嚟效果會有這麼大分別嗎？
但如果只係超低音差0.875，我都相信改咗可能會有改善
如果全部都要乘0.875的話，理解上應該只係口型不對，最多係聲畫有少許不同步。。。
qq1122yq 發表於 2023-3-3 14:26
愚蠢一問
如果全部声道連超低音都同時間要乘0.875
即是全部距離只是相差0.125， 出嚟效果會有這麼大分別嗎 ...
以4m距離計，delay時間係0.01166秒，0.875與否，個分別只係0.0015秒，時間分別係好少好少，遠遠未影響到咀型呀聲畫同步呢類問題，完全無需擔心。
