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Description 1, title of the invention
Equalizer multi-way control amplifier
8. Detailed Description of the Invention The present invention relates to a multi-way control
amplifier in which the equalizer circuit of the preamplifier and the channel μ divider in the
multi-repetition method are combined with End Page: 1. To the conventional multi-way method?
The signal from the cartridge (1) of the record player is given to the amplifier (2 to (3) and the
equalizer circuit (4) plus the preamplifier (5) as shown in an example of FIG. The equalizer circuit
(4) is for t-correcting the R / A recording characteristics of the LPt / code shown in FIG. 2
(recording characteristics derived from the American Record Industry Association) and making
the frequency characteristics flat. And a roll-off circuit for flattening the characteristics of the
high frequency component of 2.122 KH2 or more. Usually, the circuit is switched over and low,
or inserted into the negative feedback amplifier of the amplifier. The output of the preamp (5) is
channel / L /? It is given to bypass filter HPF and low pass filter LPF via buffer amplifier '(7) of I
pider (6) ・ These filters HPF and LPP are the crossover frequency which branches the use band
of the speaker for component and low frequency As the cutoff frequency. The output cover of IFF
and low-pass filter I and PF is for increasing the high and low frequency signal components of
channel 2 (6) and is for high-tone speaker (tow eater) @ and bass speaker respectively (Woofer)
Connected to In such a conventional multi-way system, since the frequency band is divided again
by the channel divider by setting the frequency characteristic to j1 by the preamplifier, there is a
waste in the configuration of the fly. In addition, a buffer amplifier with a gain of 1 is required to
match the impedance at the input and output of the filter, which has the disadvantage of
increasing noise and deteriorating phase characteristics. It is an object of the present invention to
provide a multi-way control amplifier capable of obtaining such excellent sound quality with a
simple configuration by removing the conventional defects. The construction of the invention will
now be described by way of example with reference to the drawings. FIG. 3 shows an
embodiment of the present invention. In the figure, the output of a human power source, such as
a cart, ridge (1) is applied to the roll-off circuit via an amplifier α4. The roll-off circuit is for
correcting the high range of the R-engine AA recording characteristic, and its output is given to
the amplifier.
The amplifiers .sigma..rho. And (to) amplify the output of the cartridge to the required level as
the input of the filter. The output of the amplifier is applied to the bypass filter HPF and the
turnover circuit α. The turnover circuit q is for correcting the low station of the R-engine AA
recording characteristic, and its output is given to the low-pass filter LPIP via the amplifier.
Usually, the crossover frequency is selected to be 5QO to 1.5KH2 in 2 Weimer to Ciande, but in
the present invention, the flat portion of the R processing AA recording characteristic "shown in
FIG. 2, that is, 500 to 2.1gKHz It is necessary that it be 500 Hz, which is its lowest frequency
cloud -i-i?-. The outputs of the high-pass filter IFF and the low-pass filter LPF are given to the
amplifications go and cID, respectively. According to the present invention configured as
described above for each amplification, the signal system on the high band side does not need to
pass unnecessary turnover circuits, so the circuit is simplified, and the system is excellent in
terms of sound quality. It becomes. Also, to avoid changing the signal level / L 'depending on the
use of channels and dividers and matching the impedance, it is possible to omit the buffer
amplifier required for the conventional channel decoder, and to use the amplifier All can be reused one at I @ crotch. Also, if the crossover frequency is set to 500 Hz, which is the abovementioned optimum value, even if the filter characteristic of 6 dB and / octave of the HPF HPF is
used, the water characteristics are originally added to FIG. / Octave filter characteristic.
Therefore, it is possible to improve multi-phase characteristics more than channel deipida using
conventional 12 dB / octave or bypass filter EndPage: 2 or Cape. ,. I need to use it. とはいうまで
もない。 In this example, if the high and low frequency division characteristics are set to 6 dB /,
and the t recording characteristics of R-A can be used as they are, the bypass filter is unnecessary
and only the low-pass filter LPF has i64 B / octave filling characteristics. It should be a thing. FIG.
44 shows another embodiment of the present invention, which uses a multi-amplifier system
configured in 11 ways. In addition to the 2-way control amplifier in FIG. 3, a band pass filter
BPIFt? Connecting. The band pass filter BPF is a band pass filter for communicating a signal of a
medium sound (usually lower limit is about 5θ QHz, upper @flt about 5 to 7 KHz) band to the
next stage, and its output is given to the amplifier (20).
The output of the amplifier (2υ is power amplified via a power amplifier @ and applied to a midtone speaker). In this 3-in-one multi-amplifier system, it is necessary to set the cutoff frequency
of the bypass filter HPF to 5 to 7 KHz, which is the upper limit frequency of the band pass i 'and
fBPF. However, the various effects described above hold for the band pass filter. Also, it is
because the output of the amplifier a is connected to the external terminal (good), and the signal
is applied to the external terminal-via the path vibration, the turnover circuit Q and the amplifier
α4-(l). As described above, in the present invention, since the R-engine AA recording
characteristic is used for channel division, the circuit configuration can be simplified and the
phase characteristic and sound quality can be excellent, and the equalizer circuit and the channel
divider can be combined into one. As it is incorporated in the housing, the wiring distance is
short and the number of connection points can be reduced, and the sound quality can be
improved. Moreover, it is economical because only one power supply unit is required. In the
explanation on the counter plate, the multi-way controller 7-VC adapted to the R-engine AA
equalizer characteristic '2 is explained, but similar recording characteristics, such as sp-f-record
equalizer, NAB equalizer etc. It can be used for
4. Brief description of the drawings Fig. 5g is a block diagram showing a conventional
preamplifier and channel divider, Fig. 2 shows an R recording AA recording characteristic, and
Fig. 3 and Fig. 4 show different embodiments of the present invention. The block diagram of an
equalizer division type control amplifier is shown. (1) ... Cartridge, (2), (3), 04, tJl, n, 鱒. ...
Amplification 4, (4) ... Equalizer circuit, (7), (8), <9) ... Buffer amplifier, G, C11), (A) ... Power
amplifier (A, ) ... Low) V off circuit, 1. lf) ... Turnover times K, d. 榊, (2) ... speaker. Attorney
Attorney Atsushi Ryuji EndPage: 3
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