JPH084797Y2 - Voice processing circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a processing circuit for audio signals.

(B) Conventional technology Generally, audio equipment is provided with a bus circuit for controlling a so-called low-frequency component that emphasizes or lowers a low-frequency part and a high-frequency part of a reproduced audio frequency, and a treble circuit that controls a high-frequency component. ing.

These merely emphasize or reduce the characteristics of the low frequency component and the high frequency component.

Also, if you just listen to music software as described above, you can emphasize or reduce low-frequency components and high-frequency components, but if there are conversations of people such as news, dramas, talk programs, etc. There is no special need when listening.

By the way, as described in paragraphs 29 to 33 of "Electroacoustic Vibrations" issued by Corona,
There are vowels and consonants, and vowels are well within the audible range of humans and are usually not missed. However, a consonant is a plosive sound that makes a sudden stop when you hold your breath with your lips or tongue, or a fricative sound that makes noise by narrowing your breathing path with your lips, tongue, or teeth. Therefore, it is very difficult to hear. (Consonants are about
(It is a high frequency band near 8.8 kHz.) Especially, when there is a conversation with a person such as news, drama, or a talk program as mentioned above, the consonant becomes difficult to hear, and the conversation becomes unclear.

(C) Issues to be solved by the present invention The present invention is to make consonants easy to hear and to hear a clear conversation when there is a conversation with a person such as news, drama or talk program as described above. With the goal.

(D) Means for Solving the Problems The present invention is directed to a right signal (R signal) component and a left signal (L signal).
Component audio signal, a low-pass filter for reducing the high-frequency component of the audio signal when the audio signal is input, and a low-pass component connected to the latter stage of the low-pass filter to make the low-frequency component of the audio signal variable. A first filter for reducing the frequency, a second filter connected to a stage subsequent to the first filter for variably emphasizing a high frequency component of the audio signal, the first filter and the second filter The audio processing circuit is characterized by comprising a control circuit for controlling the characteristics of (1) and controlling the operation of the low pass filter.

(E) Operation According to the present invention, it is possible to change the frequency characteristic of an arbitrarily output audio signal into a frequency characteristic that emphasizes a frequency component corresponding to a consonant.

(V) Embodiment An embodiment of the present invention will be described with reference to FIG. In FIG. 1, (1) is an input terminal to which a right (R) signal is input, (2) is an input terminal to which a left (L) signal is input,
(C1) and (C2) are coupling capacitors, (3) is a mixing circuit that mixes R and L signals, and (4) is a circuit that shifts the phase of signals mixed by the mixing circuit,
(5) and (6) are mixing circuits for mixing the output signal of the phase shift circuit (4) with the R signal and the L signal, respectively (C3) (C4)
Is a coupling capacitor.

Then, (7) and (8) are low-pass filters having frequency characteristics as shown in Fig. 2, which are resistors (R1) (R
2), capacitor (C5) (C6), transistor (TR1)
(TR2).

Further, (9) is a first filter for lowering low frequency components as shown in FIG. 4, and (10) is a second filter for enhancing high frequency components as shown in FIG. (9) and the second filter (10) are variable. Further, (11) is a control circuit, which controls whether or not the signal of the phase shift circuit (4) is supplied to the mixing circuits (5) and (6), and controls the low-pass filters (7) and (8). It controls whether or not to operate, and further, the first filter (9),
The frequency characteristic of the second filter (10) is also variably controlled.

 Next, the operation will be described.

The R and L signals of the reproduced audio signal are supplied to the mixing circuits (5) and (6) through the coupling capacitors (C1) and (C2). On the other hand, the R signal and the L signal are mixed by the mixing circuit (3) and then phase-shifted by the phase shift circuit (4),
Create a signal for surround. After this, the control circuit (1
If it is in the surround mode by the control signal of 1), it is mixed with the R signal and the L signal in the mixing circuits (5) and (6), and is not mixed unless in the surround mode.

Then, the signals output from the mixing circuits (5) and (6) are input to the low pass filters (7) and (8) via the coupling capacitors (C3) and (C4). At this time, if the operator specifies the normal mode, the control circuit (11) outputs a low signal and turns off the transistors (TR1) and (TR2) to allow the signal to pass therethrough. , High signal, transistor (TR1) (TR2)
Is turned on and passes through a low-pass filter having the characteristics shown in FIG. 2, which consists of resistors (R1) (R2) capacitors (C5) (C6).

Next, the signal that has passed through the low-pass filters (7) and (8) is the first signal having the frequency characteristics shown in FIGS. 3 and 4.
It is output via the filter (9) and the second filter (10). The characteristics of the first filter (9) and the second filter (10) do not change in the normal mode, and in the consonant emphasizing mode, they have a mode that changes in two steps as shown in FIGS. 4 and 3. There is.

Therefore, in the normal mode, the signal output from the second filter (10) has a characteristic as shown by the dashed line in FIG. 5, and in the consonant emphasis mode as shown by the solid line or the broken line in FIG. With such characteristics, a voice signal in which consonants are emphasized is output.

(G) Effect of the Invention According to the present invention, when listening to a voice signal such as a person's conversation, it is easy to hear. You can also hear a clear conversation.

[Brief description of drawings]

FIG. 1 is a view showing an embodiment of the present invention, and FIGS. 2, 3, 4, and 5 are views for explaining the present invention. (7) (8) …… Low pass filter, (9) …… First
Filter, (10) …… Second filter, (11) …… Control circuit.

Claims (1)

[Scope of utility model registration request] 1. Right signal (R signal) component and left signal (L signal)
Component audio signal, a low-pass filter for reducing the high-frequency component of the audio signal when the audio signal is input, and a low-pass component connected to the latter stage of the low-pass filter to make the low-frequency component of the audio signal variable. A first filter for reducing the frequency, a second filter connected to a stage subsequent to the first filter for variably emphasizing a high frequency component of the audio signal, the first filter and the second filter An audio processing circuit comprising a control circuit for controlling the characteristics of the above, and for controlling the operation of the low pass filter.