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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an electric circuit diagram showing a speaker
driving circuit according to an embodiment of the present invention, and FIG. 2 is a graph
showing signal waveforms at respective portions. 1 иии Human power terminal, 2 иии Speaker. l Fig.
1 Fig. 2 l = r (b) (C)-49-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker drive m
* that receives a digital signal. A common speaker drive am is inherently scattered and V supplied
so as to amplify as closely as possible the voice signal tube and supply it to the speaker.
However, for the purpose to be sure, in the case of a friend, if you want to inform the operator
that the key has been IIPed and the data has been correctly input in the electronic keyboard, it is
better if it only occurs when the audible frequency is 0 @ control. , The fidelity of the signal
waveform is too tight if it is between the layers. Also, (1) signals handled by devices such as 1)
are digital signals, and it is possible to drive a speaker by using digital signals as human power
#S. Since this invention is carried out to face the above-mentioned implications, the following fct??C-example will be given according to {circle over (1)}. The transient xpqyt, which has a bleak
base bias through the resistance wing, is 1mK or less, and a digital signal such as a human power
terminal is added to its emitter. When supplied, it causes a switching operation such that KOFF
when the level is high and KONK when it is low-1 this switching operation includes transistors
#Tt co and Tr,? Switching operation of the transistor 'rraO collector ? fang 21! 11b) waveform
output jl E generation + jt) t111 ell #-t '1 l t fl is a normal digital! c1Dalllll and Okaji, if necessary,
can have a simple 9IO doctrine. In addition, the collector is a collector,-) ?) 'Jj 1 [VccKITl! It is
connected via a resistor pVR, a resistor Rco and R3 and is connected to ground via a resistor Rco
and R30 contactor, a capacitor C and the voice coil of the loudspeaker 2. The speaker driving
circuit l! Configured in this way. ??????????????? When the switch is OFF, the
charge pump current flows through the circuit resistance VR and the resistor R, ttjilt, and when
the transistor Tr3 is ON, the capacitor CFi is discharged through the capacitor CFi resistor R3 and
the transistor Tr3. In this charging operation, the transistor Tr3 is turned on! It is repeated
according to the OFF operation, that is, it is repeated according to the aging of the digital signal
supplied to the input terminal 1 Km, whereby the signal coil as shown in FIG. 2 (CIK shown) flows
to the voice coil of Subika Kako. It generates an audio frequency output at the frequency
corresponding to the frequency of the digital signal supplied to the terminal /.
As described above, according to the present invention, it is possible to drive a speaker by using
a digital signal as it is as an input signal, or (3)-]. It is perfect for Also, in comparison with the
conventional O drive circuit, the number of parts is small, ? food tranne is required, 1 khe is
easy to IO, etc.
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description, jps50142020
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