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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a wireless microphone
according to the present invention, FIG. 2 is a frequency characteristic diagram of a bass
microphone unit, FIG. 3 is a frequency characteristic diagram of a treble microphone unit, FIG.
The figure is an overall frequency characteristic diagram of these units. 1 ... high range
microphone unit, 2 ... low range microphone unit. −
DETAILED DESCRIPTION OF THE INVENTION This invention relates to wireless microphones,
and in particular to the microphone unit thereof. In general, wireless microphones use an ld
modulation scheme, and high-frequency components are emphasized and transmitted by a preemphasis circuit in order to improve the signal-to-noise (S / N) ratio. However, since the voice
signal is passed through the bleed-off emphasis circuit, it is attenuated + t) σ-1β 2 / ge (°) 9 so
that the voice signal is greatly amplified and compensated by the voice amplification circuit at #I.
The However, if the amplification degree of this sound g-increase wA'l-] path is increased, not
only the residual noise increases and the S / N ratio deteriorates, but also the dynamic range
narrows and the microphone unit becomes large. When a level signal is added, the voice
amplification circuit saturates and a voice is generated, and further, phenomena such as
overmodulation, spurious increase, frequency jump and the like occur in the transmission circuit.
The object of the present invention is to provide a wireless microphone capable of emphasizing
and transmitting high frequency & components without using a pre-emphasis circuit in order to
solve the above problems. The present invention will be described below based on one
embodiment shown in the drawings. In FIG. 1, 1 is a high range microphone unit (hereinafter
abbreviated as high range unit), and 2 is a low range microphone unit (hereinafter abbreviated as
low range unit). )である。 High frequency--1 is smaller than low / range-4 '@ nonit 2 and high
frequency unit 1 is +2)) Low frequency unit 2 is placed in front and head of body 3 I am united in
the department. The low band unit 2 has flat frequency characteristics in the low band (1 KHz or
less) as shown in FIG. The high band unit 1 is more sensitive than the low band unit 2 as shown
in FIG. 3, and has the same wave number characteristic in the high band (l KHz or higher), and a
desired pre-emphasis time constant can be obtained. It is selected to be able to These two units 1
and 2 are connected in parallel or in series so that their phases match each other, and their
outputs are subjected to voice amplification, modulation, power amplification and transmission
by the transmission circuit 4. Reference numeral 5 in FIG. 1 denotes a transmitting antenna. As
shown in FIGS. 1 and 4, the overall internal wave attack characteristics of the unit 1.2 and the
like are flat in the low band and mountain-shaped in the high band. Therefore, the pre-emphasis
circuit is unnecessary, and the voice amplification degree in the transmission circuit 4 can be
reduced by that amount, so that the S / N ratio can be improved, and the width of the Gui-I0
dynamic range can be further broadened. 3) Even if a signal with a large signal level is added
from the Australian unit, it becomes difficult to generate voice distortion, overmodulation,
spurious and frequency jumps.
Moreover, the receiver can be used with a conventional de-emphasis circuit, and the receiver
does not need to be remodeled. In the above embodiment, although the low band unit 2 has a flat
frequency characteristic up to around 1 kHz, it is also possible to use one having a flat frequency
characteristic up to high band. In this case, a pre-emphasis characteristic which is increased by
approximately 3 dB is obtained at the crossover point (rise frequency) of the double-pass band of
the low-pass unit 2 and the high-pass ILI unit 1.
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