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Description 1, title of the invention
High fidelity device with stereo recording device
3. Detailed Description of the Invention A high fidelity device, for example a compact device with
an integrated cassette tape recorder, often has a microphone terminal and thus uses a separate
microphone or stereo microphone to make a unique recording and playback In such a device that
can be used, it is disadvantageous that the handling is inconvenient for the installation and
connection of independent microphones (or even two microphones in stereo recording). (In the
room (the connection cable may be intrusive, so in general the microphones are connected only
when particularly necessary, and re-taken after each recording). It is another drawback that the
planned recording with the installation of the microphone is obvious, so that the spontaneous
and accidental nature of such scenes can only be recorded and reproduced very poorly. The
object of the present invention is to provide a high fidelity device with a high quality stereo
recording device, which eliminates these drawbacks and which also has a significantly reduced
additional cost with respect to a separate high fidelity microphone configuration. It is. According
to the invention, at least one three-dimensional low frequency amplifier and two loudspeaker
boxes are provided, these loudspeaker boxes being arranged in the room at a suitable spacing as
usual and The invention relates to a high fidelity device which can be disconnected from an
amplifier output by means of a loudspeaker switch, and the invention is as follows. That is to say
that both loudspeaker boxes in the cut-off state are used for stereo microphone recording and
provided for the signal processing and at the input of each one special equalization amplifier
designed as follows: A) a) a low resistance, possibly frequency-independent damping of the
loudspeaker impedance, b) a frequency-independent noise optimization matching to a
considerable extent, C) equalization A linear equalization is performed at the output of the
amplifier to the extent of the frequency response with respect to sound pressure, and with regard
to the recording characteristics of the high-fidelity loudspeaker box of standard construction, d)
for the proximity sound Equalization amplifiers are designed such that the overall amplification is
on the order of 50 dB for 1 kHz, even when level control is possible without the need for
additional amplification control. There is. An embodiment of the device according to the
invention is shown in FIG. 1, in which an embodiment of the invention is described in the
following by means of the drawings: EndPage: 2 The use of loudspeakers as microphones, such
as, for example, in intercoms, radio telephones etc., is known in principle, but in all these
applications it is squeezing with reproduction quality sufficient for call transmission.
Therefore, a loudspeaker with a small diaphragm diameter is used here as usual, and deliberately
give up broadband equalization of the frequency characteristic also in order to obtain an
acceptable S / N ratio. It is also known to combine the intercom apparatus with the radio, for
example in a monaural radio receiver where only a small auxiliary loudspeaker is required for
intercom operation, type grats "contacts". Even for this application according to the subject
matter which is totally different from the idea of the invention, what has been said above
regarding the desired transmission quality applies. In the device according to the inventive idea,
on the other hand, using a high-power loudspeaker box, which is designed to be correspondingly
bulky for high-fidelity sound reproduction and generally has a plurality of loudspeaker systems
and a corresponding splitter. , To provide the desired benefits of recording quality and
convenient handling. The predominant ideas in this area of expertise in this regard are: That is,
such a loudspeaker box is basically not well suited for recording and not at all suitable for high
fidelity recording, due to its size and adverse rise characteristics. This means that when the highfidelity loudspeaker box is operated as it is as a microphone, a very messy and convoluted and
sloppy reproduction is carried out so that the treatment according to the invention can first be
seen superficially even in a suitable experiment The result is that the good transmission quality
that can only be obtained using otherwise expensive broadband microphones can be realized
overall. In this context, it is particularly important to apply the individual treatments proposed by
the invention in sequence. Thus, the steep gradient equalization which has been found to be
necessary for sound pressure frequency characteristics rising appropriately towards higher
frequencies reveals the importance of the input circuit of the equalizing amplifier which is
constructed with a great deal of noise optimization. It has furthermore proved to be problematic
that the source impedance is very low at 4 to 8 Ω for the application according to the invention.
A further subject matter of the invention is the recognition that the impedance of the
loudspeaker box is to be used during operation in a frequency-dependent and as low a resistance
load as possible for use in high fidelity stereophonic recordings. Operating at no load like a
regular microphone proved to be disadvantageous. However, this requirement due to the very
low and frequency dependent input impedance of the equalizing amplifier considerably limits the
design conditions and possibilities of the equalizing amplifier, with respect to the requirements of
noise optimization and with regard to the maximum level controllability, Thus, conventional
microphone amplifiers constructed according to the prior art are not preferred for the purposes
of the present invention.
On the other hand, according to a special embodiment (9) according to the inventive idea, the
special equalization amplifiers 7.8 each have one transformer 9 at the input and are grounded at
the base for optimum noise Input impedance to the amplifier input terminal of the subsequent
amplifier stage 10 designed to be equal to the desired value, which is considerably lower than
the low impedance of a typical loudspeaker box of, for example 4 Ω, ie of the order of 1 Ω. The
transformation ratio and efficiency of the transformer 9 are determined to convert to values.
Using a 1:10 step-up conversion to the base-grounded transistorized human power stage 10 and
the emitter of this stage, the noise matching requirements are fulfilled, on the one hand, in
connection with the appropriate notes of the operating point of this stage, At the same time, on
the other hand, the desired and substantial braking of the loudspeaker impedance takes place.
Thus, for example, the loudspeaker impedance seen from the transistor input terminal is
approximately 500 Ω to 1 Ω, while the input impedance of the transistor 10 is only
approximately 90 Ω when the emitter current is 0.3 mA. This corresponds approximately to (10)
EndPage: 3 noise matching. At the same time, the impedance of the input stage 10 takes on the
value of approximately 1.5 Ω at the input of the transformer 9, so that the signal generator is
strongly damped and, for example, the input resonance of this signal generator is also
suppressed. This requirement can not be realized in practice in a controlled input stage without a
transformer. This is because it has to handle large currents in this stage, which leads to noise
optimization. On the other hand, the degree of freedom in the choice of transformation ratio for
the input transformation is likewise limited considering the efficiency and frequency
characteristics, so to meet the requirements according to the invention, the inputs from other
designs are There is no stage control. An example circuit of an amplifier for one channel is shown
in FIG. The input of transformer 9 is balanced against leakage via regulator 12. A signal travels
from the secondary winding of transformer 9 via the capacitor 13 to the emitter of the input
stage 10, and this signal is transmitted from the load resistor 19, 2.0 of this input (11) stage to
the equalization network 21 °. The input terminal of the operational amplifier 11 is reached via
22.23.24. The amplified and equalized signal is transferred from the output terminal of the
operational amplifier via the capacitor 26 and the decoupling resistor 27 to the low frequency
program selector of the high fidelity amplifier 1 or 2. The operating point of the input stage 10 is
determined by the resistors 14.16.18.
A capacitor 17 is used for the pace decoupling of the stage 10. Operational amplifier 11 and
negative feedback network 28.29. With 3.0 and 31.32.33, equalization of steep gradients of the
sound pressure frequency characteristics is performed. Another embodiment of the present
invention relates to another two loudspeaker boxes 3 *, 4 * connection sockets and an optional
loudspeaker switch 5 *, 6 * for selectively or simultaneously connecting both stereo loudspeaker
groups. High-fidelity playback device having the same, and both stereo loudspeaker groups are
arranged in two different rooms A and B, and one stereo loudspeaker group not used for
regeneration is connected to the microphone stereo recording side (12) is included. An
embodiment of this device is shown in FIG. According to the proposal according to the invention,
it is possible on the one hand to switch from stereo room A to room B and vice versa. On the
other hand, when the attached loudspeaker switches 5, 6 and 5 *, 6 * are appropriately switched,
the interphone operation can be performed by stereophonic sound between the room A and the
room B. Obviously, stereo recordings or intercom calls from both rooms can be recorded to tape
using the tape recorder as well as other programs respectively. In some cases, it is also
advantageous to be able to make stereo recordings from both rooms when it is possible to shut
off both loudspeaker groups for reproduction and thus to operate simultaneously in parallel for
stereo recording. According to another proposal of the invention, the program selection switch of
the high fidelity stereo low frequency amplifier of the high fidelity reproduction device according
to the invention comprises (13) others of the usual input terminals for radio, phonograph and
tape recorder signals. It is advantageous to have the additional functionality for stereo recording.
Therefore, in addition to the normal playback operation for radio, phonograph or tape program,
it is possible to select a unique stereo recording program, so that the three application devices of
so-called radio, phonograph and tape recorder are not prioritized but actually 4 It is extended to
the program. Of course in the same room this can only be heard via headphones when
preventing acoustic feedback, but at the same time it can be recorded on tape and with the
second loudspeaker group installed the room of tube 2 Can be transmitted directly to According
to a variant of the embodiment of the invention, the amplifier input socket normally provided for
the "external" input signal is configured as a connection socket, and the stereophonic recording
signal extracted from the loudspeaker box is The program selection switch can be used to select
via the "external" input terminal.
It is not necessary to extend the program selection switching itself in conventional high fidelity
regenerative amplifiers as proposed here. Because the so-called "external" input terminals, which
are often also referred to as "spare" and (14) EndPage: 4 are not necessarily occupied, and the
invention when using connection sockets Although it is assigned for the three-dimensional
recording function according to, it can be used for other purposes. Finally, according to the
present invention, the following proposals are made. That is, one or more loudspeaker
changeover switches 5, 6.5 *, 6 * and special equalization amplifiers 7, 8 for stereo recording
signals taken from the loudspeaker box are for loop connection of loudspeaker signals,
monitoring The invention shown in FIG. 4 assembled together as an independent additional
device together with appropriate connection sockets) ( 35. 34 *, 35 *) for the
headphones 36 and the stereophonic recording output 37. According to the above-mentioned
additional device, the three-dimensional recording function according to the present invention
can actually be added to each conventional high fidelity reproducing device without limitation.
The output (15) socket of the additional device is generally connected to the TAII / TBII input of
the high-fidelity amplifier. The loudspeaker connections are loop connected and simultaneously
feed the independent terminals for the stereo headphones. A separate battery or a unique power
supply can be provided in the additional device for feeding.
4. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of
the device according to the present invention, FIG. 2 is a circuit diagram of an equalizing
amplifier in the device according to the present invention, and FIGS. FIG. 6 is a block diagram
showing another □ embodiment of the device according to the invention. 1.2 ... low frequency
amplifier, 3, 4 ... loudspeaker box, 5.6 ... loudspeaker switch, 7, 8 ... equalization amplifier, 9 ...
transformer, 10 ... Amplification stage. Attorney Attorney Roland ・ Sonder Hof (one other
person) (16) Fig. 1; ° · j · j 'J' l '+' (content (no change)) 令-4; 2L4EndPage: 5 procedure
amendments (method ) (Spontaneous), display of the case Patent Application No. 27 599: 1 Title
of the invention: 1 Title of the invention High fidelity device with stereo recording device:
Relationship with the case of correction: Case of patent applicant, Date of the representative 〒
100-1 correction instruction Showa date (shipping date) except for the drawing. 6
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