共 2 条
- [1] INSTRUMENTATION FOR THE MEASUREMENT OF SOUND PRESSURE LEVEL WITH THE WESTERN ELECTRIC 640AA CONDENSER MICROPHONE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 1948, 20 (06): : 807 - 817
- [2] INSTRUMENTATION FOR THE MEASUREMENT OF SOUND PRESSURE LEVEL WITH THE WESTERN ELECTRIC 640-AA MICROPHONE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, 1947, 19 (01): : 290 - 290