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JPH0496425

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DESCRIPTION JPH0496425
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
audio frequency characteristic automatic switching system in which speech can be heard without
any sense of disparateness by automatically switching the audio frequency characteristic
according to the contents of broadcasting. (Related Art) In recent years, audio signal processing
apparatuses having various methods and characteristics have been considered, but in particular,
with regard to sound quality, sufficient attention has been paid and considered. As an example,
there is a system in which circuits having two or more different frequency characteristics are
switched in order to prevent the viewer from having a sense of harmony with any broadcast
content. FIG. 3 shows an outline of an audio signal processing apparatus of the above system. In
the figure, the reference numeral 11 denotes the Bass circuit 1 and 12 of the low cutoff
frequency f1, and the Bass circuit 2 and 13 of the low cutoff frequency f, and the Trebble circuits
1 and 14 of the high cutoff frequency f are also high. Range cutoff frequency f4 Trebble circuit
2.15.16.18 is gain control signal of each circuit, 19 ° 20 is characteristic switching switch, 2I is
original sound of voice signal, 22 is control circuit, 23 is control circuit 22 is an audio signal
whose gain has been determined. The volume control circuit is omitted in FIG. The operation of
the conventional audio signal processing apparatus configured as described above will be
described below. Usually, the case where the viewer hears the audio is the same as the
conventional case, and here, the case where the broadcast content is changed will be described. It
is assumed that the broadcast content is mainly music, and the viewer selects the Ba5s circuit 1
and the Trebble circuit 1 with the characteristic changeover switch 19.20, maximizes each
volume, and sufficiently activates both circuits. Then, the frequency characteristic curve is as
shown in FIG. 4 (a). In this state, when the broadcast content changes from music to speech, the
voice is high and the gain is increased in the low band part, making it difficult for the viewer to
hear. Therefore, the viewer can obtain flat characteristics over a wide area as shown in FIG. 4 (b)
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simply by switching the characteristic switches to the Bass circuit 2 and the Trebble circuit 2
without lowering the volume of each control circuit. Corresponds to the broadcast contents
quickly and can hear the sound without discord. FIG. 4 (c) summarizes the characteristics
obtained by the circuit of FIG. As described above, according to the conventional audio signal
processing apparatus, the viewer can listen to clear audio in an instant regardless of what kind of
broadcast content. However, each time the broadcast content switches from speech to music or
from music to speech, the viewer can listen to the clear local audio at each local point of the
receiver. There is a disadvantage that the switch or remote control has to be done to switch the
circuit, which is very complicated.
The object of the present invention is to eliminate the drawbacks of the prior art and to
automatically switch the characteristics of the low frequency part and high frequency part of the
audio frequency signal on the receiving side by the pilot signal multiplexed and transmitted to
the television signal. It is an object of the present invention to provide an audio frequency
characteristic automatic switching system which can make clear voices audible. The voice
frequency characteristic automatic switching system according to the present invention has a
circuit configuration having two or more types of circuits having different characteristics for
controlling the gain of each of the low band part and the high band part of the speech frequency,
A pilot signal for low-pass and high-pass characteristic switching is multiplexed to a television
signal and transmitted from the signal transmission side, and the low-pass and high-pass
characteristics of the audio frequency are automatically switched by the pilot signal on the
receive side. It is. (Operation) According to the configuration of the present invention, the viewer
can select a circuit for automatically determining the optimum audio frequency characteristic no
matter how the broadcast content is switched, and can always hear clear audio. An embodiment
of the present invention will be described with reference to the drawings. FIG. 1 shows a
schematic configuration of an audio frequency characteristic automatic switching system
according to an embodiment of the present invention. In the figure, 1 and 2 are Ba5s circuits 1,
2, 3 and 4 of low-pass cutoff frequency f and f respectively, and high-frequency cutoff frequency
f and Trebble circuit 3 ° 4.5 of f4 are voice frequency characteristics The pilot signal for
switching, 6 receives the pilot signal 5 and transmits the switching signal to No, 1, No, 2 of the
switching part of the characteristic switching circuit 7 cpu 8 represents the original sound 9 of
the audio signal Ba5s. It is a control circuit that superimposes the gain control signal determined
by both circuits of the Trebble and outputs an audio output signal 10. The operation of the audio
frequency characteristic automatic switching system configured as described above will be
described below. It is assumed that the broadcast content is mainly music, and the low and high
frequency characteristics of the voice are respectively selected as the Ba5s circuit 1 with low cutoff frequency f1 and Trebble circuit 1 with high cut-off frequency f. . Here, when the contents of
the broadcast change from music to speech, as shown in FIG. 2, the pilot signal sends a CPU
operation start pulse of 1 and then the changeover switch No. 1. Send 2 bits of data to decide No,
2 operation. The first one bit selects the Ba5s circuit 2 at the 'L' level, and the second one selects
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the Trebble circuit 2 at the 'L' level to keep the voice clear even if the viewer does not operate the
receiver. You can hear
As described above, according to the present invention, the viewer can hear clear audio
instantaneously without operating the receiver regardless of what kind of broadcast content.
(Effects of the Invention) As described above, according to the present invention, by the addition
of a simple circuit, a voice with a good sound quality adapted to the contents of the broadcast
can be automatically heard, and the practical effect is large. .
[0002]
Brief description of the drawings
[0003]
1 is a schematic configuration diagram of an audio frequency characteristic automatic switching
system according to an embodiment of the present invention, FIG. 2 is an operation characteristic
diagram according to pilot signals of FIG. 1, and FIG. 3 is a schematic configuration of a
conventional audio signal processing apparatus FIG. 4 is an audio frequency characteristic
diagram obtained in FIG.
1: Ba5s circuits 1 and 2 of low-pass cutoff frequency f 1, Ba5s circuits 2 and 3 of same-f, Trebble
circuits 1 and 4 of high-pass cutoff frequency f, 4: same-f Trebble circuit 2.5, ... pilot signal, 6 ...
CPU, 7 ... characteristic switching circuit, 8 ... control circuit, 9 ... audio signal original sound,
output signal. lO ... voice
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