44:. For instance, the plosive "p" sound from a vocalist sends an initial positive air pressure wave toward the microphone which responds with an initial inward movement of the microphone diaphragm, away from the vocalist. To maintain absolute phase, a loudspeaker reproducing the sound would send an initial positive pressure outward from the loudspeaker, toward the listener.
101:
or finite wavetrain can be considered as a signal of a single frequency modulated by an envelope, or as a superposition of an infinite number of infinitesimal waves of different frequencies. In the first case, one may speak of the phase of the wave with respect to the envelope as the absolute phase.
64:
case for the audibility of absolute phase", especially for high impulse sounds such as percussion. The concept of absolute phase is rendered irrelevant for any instrument with strings (such as a guitar or piano), or for two or more instruments played together. Complex sounds such as these are known
55:
the channels simultaneously makes a subtle perceptible difference in the reproduced sound, even though the relative phases of all the channels are preserved. The ear is sensitive to the periodicity of a waveform at low frequencies; tests have shown that absolute phase can sometimes be heard by test
77:, the phase of the voltage and current at various points in the system relative to one another are important. If the points of interest are widely separated in space, it can be difficult to measure the relative phase. To solve this problem, the phase of the signals relative to absolute time (
27:
relative to some standard (strictly speaking, phase is always relative). To the extent that this standard is accepted by all parties, one can speak of an absolute phase in a particular field of application.
102:
In the second picture, it is a question of the relative phase of the component frequencies. For examples of physical effects due to the phase of signals with the same power spectrum.
47:
In audio, a change in polarity refers to an equal phase shift of 180° at all frequencies, usually produced on one channel by reversing the connections of two wires. Some
36:
In the reproduction of sound by headphones or speakers, absolute phase refers the phase of the reproduced signal relative to the original signal, retaining the original
279:
Paulus GG, Grasbon F, Walther H, et al. (November 2001). "Absolute-phase phenomena in photoionization with few-cycle laser pulses".
56:
subjects listening with monaural conditions (a single loudspeaker, or headphones sending the same signal to both ears.) Audio engineer
252:
216:
189:
160:
133:
65:
to have an undetectable phase relationship. In practice, the absolute phase of an audio system can be assumed to be inaudible.
98:
85:. Comparison of two absolute phases in this sense allows the relative phase of distant signals to be computed.
40:. A positive pressure on the microphone is reproduced as a positive pressure by the loudspeaker or headphones
336:
208:
Sound
Systems: Design and Optimization: Modern Techniques and Tools for Sound System Design and Alignment
267:
288:
37:
312:
304:
248:
212:
206:
185:
156:
150:
129:
94:
74:
231:
177:
123:
296:
292:
41:
330:
20:
316:
57:
48:
308:
24:
300:
82:
78:
245:
The Audio Expert: Everything You Need to Know About Audio
184:(3 ed.). Taylor & Francis US. pp. 88–89.
232:
Absolute Phase: A Prerequisite To
Optimum Performance
128:(5 ed.). Taylor & Francis US. p. 23.
152:Loudspeakers: For music recording and reproductio
8:
247:. Taylor & Francis US. pp. 85–86.
81:) is measured using instruments relying on
117:
115:
211:. Taylor & Francis US. p. 378.
149:Newell, Philip; Holland, Keith (2012).
111:
51:claim that reversing the polarities of
125:Audio Power Amplifier Design Handbook
7:
182:Loudspeaker and Headphone Handbook
14:
268:Arbiter Systems – Absolute Phase
178:"Transducer driver mechanisms"
1:
353:
155:. CRC Press. p. 291.
180:. In John Borwick (ed.).
176:Watkinson, John (2012).
205:McCarthy, Bob (2007).
122:Self, Douglas (2009).
60:concludes "there is a
243:Winer, Ethan (2012).
293:2001Natur.414..182P
73:When dealing with
32:Sound reproduction
95:signal processing
89:Signal processing
75:power electronics
69:Power electronics
344:
321:
320:
301:10.1038/35102520
276:
270:
265:
259:
258:
240:
234:
229:
223:
222:
202:
196:
195:
173:
167:
166:
146:
140:
139:
119:
352:
351:
347:
346:
345:
343:
342:
341:
327:
326:
325:
324:
287:(6860): 182–4.
278:
277:
273:
266:
262:
255:
242:
241:
237:
230:
226:
219:
204:
203:
199:
192:
175:
174:
170:
163:
148:
147:
143:
136:
121:
120:
113:
108:
91:
71:
34:
12:
11:
5:
350:
348:
340:
339:
337:Wave mechanics
329:
328:
323:
322:
271:
260:
254:978-0240821009
253:
235:
224:
218:978-0240520209
217:
197:
191:978-0240515786
190:
168:
162:978-1136124372
161:
141:
135:978-0240521626
134:
110:
109:
107:
104:
90:
87:
70:
67:
33:
30:
17:Absolute phase
13:
10:
9:
6:
4:
3:
2:
349:
338:
335:
334:
332:
318:
314:
310:
306:
302:
298:
294:
290:
286:
282:
275:
272:
269:
264:
261:
256:
250:
246:
239:
236:
233:
228:
225:
220:
214:
210:
209:
201:
198:
193:
187:
183:
179:
172:
169:
164:
158:
154:
153:
145:
142:
137:
131:
127:
126:
118:
116:
112:
105:
103:
100:
96:
88:
86:
84:
80:
76:
68:
66:
63:
59:
54:
50:
45:
43:
39:
31:
29:
26:
22:
18:
284:
280:
274:
263:
244:
238:
227:
207:
200:
181:
171:
151:
144:
124:
92:
72:
61:
58:Douglas Self
52:
46:
35:
16:
15:
62:prima facie
49:audiophiles
106:References
331:Category
309:11700551
38:polarity
25:waveform
317:4414801
289:Bibcode
19:is the
315:
307:
281:Nature
251:
215:
188:
159:
132:
42:driver
313:S2CID
99:pulse
23:of a
21:phase
305:PMID
249:ISBN
213:ISBN
186:ISBN
157:ISBN
130:ISBN
297:doi
285:414
93:In
83:GPS
79:UTC
53:all
333::
311:.
303:.
295:.
283:.
114:^
97:a
319:.
299::
291::
257:.
221:.
194:.
165:.
138:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.