JPS63292800A - Sound image enlarging and forming device - Google Patents

Abstract

PURPOSE:To form an image having a stereophonic effect and a deepness by mixing and outputting the original signal of a first and a second frequency bands and the delay signal of a third frequency band to one case and side and the original signal of the first and the third frequency bands and the delay signal of the second frequency band to the other side. CONSTITUTION:The signal inputted by monaural is divided to first-third frequency bands by filters 2, 3, 4, the signals of the two frequency bands are delayed by delay circuits 5, 7, and two preamplifying circuits 6, 8 are provided. In one channel, the original signal of the first and the second frequency bands and the third delay signal are mixed, in the other channel, the original signal of the first and the third frequency bands and the second delay signal are mixed and the signal of the two channels is formed, thereby, a sound signal output in which the image is enlarged is obtained. By centering the position of a low frequency part applying an important influence to a normal position feeling, the normal position feeling of the sound image is maintained and by horizontally enlarging the sound image of a middle frequency and a high frequency, a sound image enlarging effect rich in a presence feeling can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to an apparatus for enlarging and forming a sound image in monaural signals of audio and television receivers.

<Prior Art> With the recent development of electroacoustic technology, sound image magnification forming devices that create a sound field feeling and a sense of widening in the viewer as if the sound is spreading are becoming popular. In conventional sound image enlargement and formation devices for monaural signals, two channels are constructed by changing the phases of some frequency bands, as shown in FIG. 4(a), and two channels are configured as shown in FIG. 4(b). As shown in FIG. 4(C), the signals of some frequency bands may be delayed to form two channels, or the first... The second frequency band is divided into two frequency bands, each of which is delayed by a delay circuit, the original sound of the first frequency band and the delayed signal of the second frequency band are mixed into one channel, and the second frequency band is mixed with the delayed signal of the second frequency band. The original sound in the second frequency band and the delayed signal in the first frequency band were mixed to create a two-channel signal.

<Problems to be Solved by the Invention> However, in the above-mentioned sound image expansion and formation device for monaural signals, although it is possible to feel a sense of υ due to the expansion of the sound, it tends to impair the sense of sound image localization and may even cause discomfort. Giving was important.

<Means for Solving the Problems> The present invention provides an apparatus including a signal amplification circuit, in which a monaural input signal is input to at least first, second, . Third
frequency bands, the signals of at least two frequency bands are delayed by a delay circuit, two preamplifier circuits are provided, and one channel has signals of the first and second frequency bands. The original signal and the third delayed signal are mixed, and the other channel is mixed with the original signal of the first and third frequency bands and the second delayed signal to create a two-channel signal, thereby creating a sound image. This is to obtain an enlarged audio signal output.

<Function> Among the music reproduction amplification circuits that amplify the music source, at least the first. Second. By dividing the third frequency band into three frequency bands and leaving at least one original signal in two channels, the sense of sound localization is maintained;
．． The original signal of the second frequency band and the delayed signal of the third frequency band are mixed, and the other signal is mixed with the original signal of the first frequency band. By mixing the original signal in the third frequency band and the delayed signal in the second frequency band and outputting it with the perceptual frequency characteristics of both channels flat, the sound spread is expanded and the sense of stereo is created. It is possible to form and produce a sound image with great effects and a sense of depth.

<Embodiment> FIG. 1 is a block diagram showing an embodiment of the present invention, in which a monaural signal is output as an original signal after passing through a low-pass filter 2 and a band-pass filter 3.

The delay signal output from the delay circuit 7 is supplied to the mixing circuit 6 through the bypass filter 4 and the delay circuit 7.

The overall characteristics of each filter are designed to be flat. On the other hand, the low-pass filter 2 and the

The original signal output passes through the bus filter 4, passes through the non-end pass filter 3, passes through the delay circuit 5, and is supplied to the delayed signal ratio A mixing circuit 8.

FIG. 2 is a diagram explaining the sound image obtained by the present invention. When the output obtained in FIG. Since it is output in
The sound image is located at the center of the speaker, in the low range 12, and the midrange signal is output from the speaker 14 as a delayed signal 17, and from the speaker 15 as the original signal 19, so the sound image is placed to the right like the midrange 13. To position. The high frequency signal is from the speaker 14 and the original signal 18,
Since the delayed signal 20 is outputted from the speaker 15, the same effect can be obtained by combining the speakers 15 and 20 into one.

<Effects of the Invention> As described above, according to the present invention, by locating the low range, which has an important effect on the sense of localization, the sense of localization of the sound image is maintained, and the sound image of the mid and high ranges is By expanding left and right, you can get a realistic sound image enlargement effect, which is very effective.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing one embodiment of the multilayer υR;
The figure shows the effect of the embodiment of the present invention, and FIG.
Block diagram illustrating another embodiment of Ken, Ming, FIG. 4(a)
, (b) and (C) are block diagrams showing conventional examples. 1...Monaural signal 2...Low pass filter 3...Band pass filter 4...Bypass filter 5...Delay circuit 6...
Mixing circuit 7...Delay circuit 8...Mixing circuit 9...Mixing output (A) 10...Mixing output (B) 11...High frequency signal 12...Low frequency signal 13
...Medium range signal 14...Speaker 15...
・Speaker 16...Low frequency original signal 17...
・Mid-range delayed signal 18...High-range original signal 19...
Mid-range original signal 20...High-range delayed signal 21...
Delay circuit 22...Band pass filter 23...Bypass filter 24...Band elimination filter 25...Pand pass filter 26...Phase shift circuit 27...Mixing circuit 28...Output (A) 29...Mixing output (b) 30...Delay circuit 31...Mixing circuit 32...Output (,a) 33...Mixing output (Q) 34...Low pass filter 35. ...Bypass filter 36...Delay circuit 37...Delay circuit 38...Mixing circuit 39...Mixing circuit 40...Mixing output (d) 41...Mixing output (e). Patent applicant Nippon Columbia Co., Ltd.fli1! !
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Claims (1)

[Claims] In a device equipped with a two-channel reproduction signal amplification circuit, a monaural input signal is
, divided into three frequency bands, second and third, and delaying signals in at least two frequency bands by a delay circuit;
One channel mixes the original signals of the first and second frequency bands and the third delayed signal, and the other channel mixes the original signals of the first and third frequency bands and the second delayed signal. A sound image enlargement forming device characterized in that a sound image is enlarged and formed by mixing signals and creating two-channel signals.