| 主权项 |
1. A headphone device comprising:
a first housing and a second housing; a headband connected to the first housing and the second housing; a first headphone unit and a second headphone unit disposed in the first housing and the second housing, respectively; a first microphone and a second microphone arranged in the vicinity of the first headphone unit and second headphone unit; and a signal processing unit disposed in the first housing and configured to:
process input audio signals from the outside and microphone signals detected by the first microphone and the second microphone, andgenerate a first noise-canceled audio signal and a second noise-canceled audio signal, according to a filter coefficient selected based on a sound reproduction environment, to be supplied to the first headphone unit and the second headphone unit, wherein the microphone signals of the second microphone, having high output impedance, disposed in the second housing are supplied to a buffer circuit having low output impedance, and the output signals of the buffer circuit are supplied to the signal processing unit via a first cable arranged in the headband, wherein the buffer circuit comprises an emitter follower transistor circuit using a transistor, and wherein the second noise-canceled audio signal is supplied from the signal processing unit to the second headphone unit disposed in the second housing via a second cable arranged in the headband. |
