Abstract Combined loud- and low-speaking telephone instrument in one unit comprising no more than two electro-acoustic converters, one of which is used as a microphone when the telephone instrument is in its loud-speaking function position and as a telephone receiver when the instrument is in its low-speaking function position, while the other electro-acoustic converter is used as a loudspeaker when the telephone instrument is in its loud-speaking function position and as a microphone when the instrument is in its low-speaking function position. When resting on a table or a similar support a switch button which protrudes through the bottom of the telephone instrument is pressed in so as to keep this in its loud-speaking function position, and when the instrument is lifted from its support the switch button is pressed out switching the instrument to its low-speaking function position.
Telephone instrument comprising a first and a second electroacoustic converter and a switching means for switching the instrument from loud-speaking function into low-speaking function and vice-versa, the first and the second electro-acoustic converter being arranged to be switched upon the operation of tHe switching means, so that said first electro-acoustic converter in the loud-speaking function of the telephone instrument transforms sound waves into electric signals and in its low-speaking function converts electric signals into sound waves while said second electro-acoustic converter in the loud-speaking function of the telephone instrument converts electric signals into sound waves and in its low-speaking function converts sound waves into electric signals.
Claim 2
Dependent Claim
106 words
Telephone instrument comprising a first and a second electroacoustic converter and a switching means for switching the instrument from loud-speaking function into low-speaking function and vice-versa, the first and the second electro-acoustic converter being arranged to be switched upon the operation of tHe switching means, so that said first electro-acoustic converter in the loud-speaking function of the telephone instrument transforms sound waves into electric signals and in its low-speaking function converts electric signals into sound waves while said second electro-acoustic converter in the loud-speaking function of the telephone instrument converts electric signals into sound waves and in its low-speaking function converts sound waves into electric signals.
Claim 3
Dependent Claim
56 words
Telephone instrument according to claim 1, comprising further two attenuators for producing necessary level and frequency corrections, said attenuators being connected individually between the electro-acoustic converters and the connection wire of the telephone instrument by means of said switching means when this is switched into the position corresponding to the low-speaking function of the telephone instrument.