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DESCRIPTION JPH0389612

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DESCRIPTION JPH0389612
[0001]
FIELD OF THE INVENTION The present invention relates to an electroacoustic device comprising
a device for playing speech and / or music and a device for setting the volume of the playback
signal via a microprocessor. Prior Art This type of acoustic signal reproduction apparatus is often
over-designed as follows. That is, it is an overdesign that causes the electroacoustic transducer to
be destroyed in the case of an erroneous operation, negatively affects the environment with too
high regeneration levels, or adversely affects human health. The problem to be solved by the
invention The object of the present invention is to obtain the possibility of avoiding the
abovementioned drawbacks. Means for Solving the Problems The above-mentioned problems are
solved by the present invention so that the maximum value of the adjustable volume is variable.
For example, it is known to set the volume digitally and then to perform an analog adjustment via
a corresponding D / A converter. A storage device is provided in the present invention. This
storage device can store one value corresponding to the fall reproduction level desired. The
desired reproduction signal is set by the user of the device not to exceed the limit. This maximum
limit value can be individually preset in consideration of the connected electroacoustic
transducers or the physiological burden and can be adapted to the given external situation.
EXAMPLE FIG. 1 shows a flow chart of a program according to which the acoustic device
operates and which is executed by the microprocessor. In the case of adjustment of the volume
by the pulse generator, the volume is changed like a sidewalk. As this volume is increased
gradually, it is constantly checked whether the value set instantaneously is the same or greater
than the previously stored limit value. Only when the limit has been reached is the continuous
increase in volume avoided. In this case, the volume reached does not change even if the
adjustment member is operated. Furthermore, in an additional query scan, it is determined
whether the limit value may be exceeded. In the case of Yes, the volume is increased even if the
limit value is reached. For example, if the operator himself wants to exceed the limit values stored
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so far. However, this is possible only in the following cases. That is, this volume increase is
performed by the operation of the special key. This achieves, for example, the following. That is
to say, even when a young child who knows nothing is operated, it can only change the volume
up to the limit value set up to that point. However, in this case as well, only adults know the key
This means that the volume setting can be continued by operation.
Next, the embodiment will be described based on the block circuit diagram of FIG. The operation
of a zero-turn knob-shaped incremental generator (INC), which initially assumes that the volume
set at the lowest level, generates a pulse I, which is evaluated in the encoder (ENC) The encoder
(ENC) issues a pulse and simultaneously counts up or down the binary counter (COUNT) via the
U / D line (up / dow). The pulse I is connected via the AND-gate (G1) and the OR-gate (G2) to the
count input of the counter (COUNT). The AND-gate (G1) is initially turned on by the H-level from
gate (G3). This threshold can be stored in the memory (MEM) by the operation of the key (T I)
when the counter has reached the count value corresponding to the desired limit when the
predetermined volume is reached. . The value derived from the counter is led to the digital /
analog converter (D / A) via the BUS-line (B '), the analog output voltage of said converter acting
as control voltage for the amplifier (AMP) A speaker (LSP) is connected to the amplifier. During
subsequent adjustments of the volume, the digital value produced by the counter is continuously
compared with the value stored in the comparator (CMP). In the same case, an H-level is
delivered, which is negated by the gate (G3), whereby the AND-gate (G1) is closed so that no
further pulses I from the encoder can pass. . That is, even if the incremental generator is
operated, the counter state is kept unchanged and can not be continuously increased. However,
when this value should be able to be exceeded once (though this should of course be possible by
the authorized person), a special, hard-to-operate code key (G2) Open, the gate (G4) connects
pulse I to the count input of the counter. The invention is particularly suitable for microprocessor
controlled devices, as it does not require any extra cost. Because it can be incorporated into the
software of the device.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a diagram of a program of a program progressing in the apparatus, and FIG. 2 is a block
circuit diagram for explaining the operation.
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