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JPS5472524

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DESCRIPTION JPS5472524
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a sound reproducing
apparatus according to an embodiment of the present invention, FIG. 2 is a characteristic
diagram showing a reproduced sound response of the apparatus of the present invention, and
FIG. Spectrum distribution characteristic diagram, Figure 4 A, B is a diagram showing the level
fluctuation of the audio signal and the music signal with the passage of time, Figure 5 is a block
diagram of the signal discrimination circuit of the device of the present invention, Figure 6 af It is
operation | movement explanatory drawing of a signal discrimination circuit, respectively. 1--Input terminal, 2---Division point, 3---Power amplifier circuit, 4---Network circuit, 5---Signal
discrimination Circuits 6,... Switching circuits, 7, 8,. Switching circuits, 13 · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · switching circuit.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sound
reproduction device. The purpose is to automatically discriminate the audio part and the music
part of the program source and to control the speaker reproduction sound to one suitable for
speech and music. The present invention determines whether the program source is voice or
music to generate a control signal, and this control signal is used to switch the speaker to obtain
a reproduced sound suitable for the program source. One embodiment of the present invention
will be described with reference to the drawings. In FIG. 1, 1 is an input terminal, 2 is a dividing
point, 3 is a power amplification circuit, 4 is a network circuit, 5 is a signal, a number
determination circuit, 6 is a switch circuit, a complete is a first speaker, 8 is a first speaker 2
speakers. The operation of the circuit shown in FIG. 1 will now be described. In FIG. 1, the signal t
'applied to the input terminal 1 is divided at 2 division points, and one is amplified by the power
amplifier circuit 3 and added to the 4 network circuits. Further, among the outputs of the
network circuit 4, the (A) one drives the first speaker 7, and the other output (B) is TJ fed to the
switch circuit 6. The other part of the divided signal is applied to the signal discrimination circuit
5 to discriminate the power / music (sword) and generate a control signal, which is applied to the
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switch circuit 6. The switch circuit 6 switches in accordance with a control signal from the signal
discrimination circuit 5 to split or drive the second power. When the signal discrimination circuit
5 discriminates that it is a human power signal full voice, the switch circuit 6 is turned off and
the second speaker 8 is not driven during the period 31 ''. Conversely, when the signal
discrimination circuit 5 discriminates that the input signal is sound and effortless, the switch
circuit 6 turns on / off to drive the second speaker 8. Here, in the case of 4b, the notorer circuit
regenerates a network having a crossover frequency of fl, + X in the first speaker 7, and
reproduces the frequency of 11 or more in the first speaker 7 and f1 or less in the second
speaker In the playback sound response of the speaker shown in FIG. 2, the human power signal
is voice n is driving only the first speaker 7 to reproduce one wave number of f or more, and the
input signal Is music, and the first and twentieth speakers 7.8 are used to reproduce 12 or more
frequencies. Next, the details of the signal discrimination circuit 5 in FIG. 1 will be described. FIG.
3 shows the frequency spectrum distribution characteristic of a signal whose main component is
voice chiyohi music. A in FIG. 3 shows the frequency spectrum of the signal in which music is a
living body, and is a characteristic such that the O frequency spectrum limit is f2 in the low
region.
B in FIG. 3 is the frequency of the signal mainly composed of voice). Sing-4 is a phase number
spectrum distribution characteristic, which is a characteristic such that 1 @ wave number at low
frequency, vector limit or fl. Fig. 4 shows the change in the level of the reproduction signal over
time, which reproduced the program source, and the fourth i'lA is the case of the hoarse signal,
although it is intermittent and the level fluctuation is large. On the other hand, in the case of a
music signal, as shown in FIG. 4B, the level fluctuation is continuous and small. Next, a circuit for
discriminating all signals mainly composed of voice and music will be described with reference to
FIG. In FIG. 5, 10 is an input terminal, 11 is an output terminal, 12 is a first switch circuit which
switches the input signal constant and switch L1 on, 13 is an integrating circuit, 14 is an optional
L1. Switching. The second switch / circuit for generating a rectangular wave and the reference
numeral 16 for a reference signal generation circuit, which has an arbitrary time constant from
the rising point of the rectangular wave which is the output of the second switching circuit 14 It
is something which generates sawing vl 減 衰 which attenuates with. Reference numeral 16 is a
third switch / circuit which switches "switching 6" at an arbitrary level L3 or more f of the abovementioned Nokichiri, and the output of the third switching circuit 16 is a control signal. . Next,
the operation of the signal discrimination circuit 5 will be described together with the 61st fia to
f. When a signal of an audio portion N and a music portion m2 is applied to the input terminal 10
as shown in a small brother 61a. This input signal is applied to the first switching circuit 12. The
first switching circuit 12 switches with the L1 response of the input signal to generate a pulse
signal shown in FIG. 6b. This noise signal is integrated by the integrating circuit 13 to form a
waveform shown in C of FIG. When this integrated signal n is applied to the second switch 77
circuit 14, switching is performed at a level equal to or higher than the threshold L2 to generate
a rectangular wave shown in FIG. 6d. When this rectangular wave is applied to the sawtooth
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wave generation circuit 16, it is converted to the waveform shown in FIG. When this signal is
applied to the third switching circuit 16, it is switched at a level equal to or lower than the
learner L3 to generate a control signal shown by f in FIG. In the audio portion N of FIG. 6a, the
control signal is generated, and the control signal is generated in the music portion. 0 The sound
reproducing apparatus of the present invention has the configuration as described above.
According to the present invention, the factory automatically distinguishes voice and music and
has the advantage that the reproduction of a few drops is b "ability.
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