JP2006121595A - Audio signal working apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an audio signal to the side of a first amplification means from being varied even while operating a second amplification means in an audio signal working apparatus configured to branch an inputted audio signal into two, connect one of the signals to the side of the first amplification means for a speaker or/and a headphone and to connect the other to the side of the second amplification means for the headphone. <P>SOLUTION: The audio signal working apparatus is configured by interposing a buffer 4, between a branching point of an inputted audio signal and a second amplification means 6 for a headphone 32, for avoiding influences upon an audio signal from the branching point 2 to the side of a first amplification means 5 even after the audio signal from the branching point 2 is processed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the present invention, an incoming audio signal is branched into two at a branching point, one on the side of the first amplifying means for amplifying the audio signal to the speaker or / and the headphone, and the other to the headphone. It is related with the audio | voice signal processing apparatus of the structure connected to the side of the 2nd amplification means to amplify each.

  In particular, the present invention relates to an audio signal processing apparatus that stably outputs an audio signal obtained on the first amplification means side even when the second amplification means is operated.

Listeners who highly value the reproduced audible sound, so-called audio enthusiasts, listen to the reproduced sound from the fluctuating audio signal and feel it unpleasant if there is even a slight fluctuation in the audio signal. Become.
On the other hand, today, in addition to listening to the playback sound with a speaker or / and headphones with respect to one sound signal, the one sound signal is played back as a monitor and listened with other headphones. Yes.

As a non-patent document, as shown in FIG. 2, an audio signal of one input is divided into two, and the audio signal obtained by the branching is processed independently such as amplification and listened to by voice. Technology is known.
That is, in the audio signal processing apparatus 1a, one input audio signal is branched to the amplifying means 5a of the main path (for the speaker 31a) and the amplifying means 6a for the headphones 32a at the branch point 2a.

In the conventional audio signal processing apparatus 1a, when the volume 10a is operated by the amplifying unit 6a to perform an amplification operation on the audio signal, that is, when an amplification operation is performed on the audio signal to the headphones, the sources are the same. A minute fluctuation (output change) is given to the audio signal from the amplifying means 5a receiving the audio signal.
Therefore, although the sound from the speaker 31a is very slight, it gives an abnormal feeling to the listener.

This variation is significant for the load impedance of the amplifying unit 6a relative to the output impedance of the source audio signal, but there is no problem if the load impedance of the amplifying unit 6a is set to be much larger. It is known that it can be considered.
Therefore, for example, if the output impedance of the amplifying means 5a is set to several tens of ohms or less and the total load impedance is set to several hundred to several thousand times the resistance value, the change of the fluctuation can be ignored. It was supposed that no problem would occur.

  However, today, there is a case where high-end sound quality is strongly demanded in an audio system including the audio signal processing device 1a. In such a case, the amplifying means 6a is subjected to an amplifying operation in order to control the output of the audio signal. As a result, a minute fluctuation occurs in the audio signal from the branch point 2a to the amplifying means 5a, but there is a demand that it is necessary not to cause even the minute fluctuation.

  The present invention has been made in view of the above circumstances, and an input audio signal is branched into two at a branch point, and one is a first that amplifies an audio signal to a speaker or / and headphones. In the audio signal processing apparatus configured to be connected to the amplifying apparatus side and the other to the second amplifying means side for amplifying the audio signal to the headphones, respectively, when the second amplifying means is operated. Another object of the present invention is to prevent a minute fluctuation from occurring in the audio signal on the side of the first amplifying device receiving the audio signal having the same source.

  The present invention keeps the impedance of the audio signal from the branch point to the first amplifying means constant even when the second amplifying means is operated between the branch point and the second amplifying means. This is an audio signal processing apparatus configured by interposing an obtained buffer or amplification means.

  The detailed configuration is that an input audio signal is branched into two at a branch point, and one of the branched audio signals is on the side of the first amplifying means for amplifying the audio signal to a speaker or / and headphones. The other is connected to the second amplifying means for amplifying the audio signal to the headphones, and the second amplifying means is operated between the branch point and the second amplifying means. In this case, it is an audio signal processing apparatus in which a buffer or an amplifying means capable of keeping the impedance of the audio signal from the branch point to the first amplifying means side constant is interposed.

  In other words, the buffer or amplifying means connected after the branch point has a similar or congruent waveform of the output audio signal to the input audio signal, and the essence of the playback content of the audio signal is constant. The state is maintained.

Further, the audio signal before being input to the buffer or the amplifying means is a high impedance input, so that it is possible to avoid affecting the signal system on the input side.
On the other hand, the audio signal after output from the buffer or the amplifying means is a low impedance output, and is configured to absorb the load fluctuation on the output side due to the operation of the amplifying means.

  The present invention divides an input audio signal into two, one of which is connected to the first amplifying means side and the other is connected to the second amplifying means side, and the branch point and the second amplifying means are connected. Between the amplifying means, a buffer or amplifying means that can keep the impedance of the audio signal from the branch point to the first amplifying means constant even when the second amplifying means is operated is interposed. By configuring, the impedance of the audio signal of the first amplifying means from the output end is constant and changes even when the second amplifying means is operated in an attempt to change the audio output of the headphones. Therefore, the audio signal processing apparatus does not cause fluctuations in the audio signal amplified and output by the first amplifying means, and further the audio from the speaker or / and the headphones.

The present invention will be described in detail based on the embodiment shown in FIGS. However, the present invention is not limited to the embodiments.
The audio signal processing apparatus 1 includes a branch point 2, buffers 3 and 4, and amplification means 5 and 6.

  The branch point 2 is for distributing the input audio signal to the amplifying means 5 side and the amplifying means 6 side.

The amplifying means 5 performs processing such as amplification on the audio signal input from the branch point 2 and outputs the processed audio signal to a speaker or / and headphones.
The amplifying unit 5 includes an amplifying unit 7 that amplifies an input audio signal, and a volume 8 that controls the amplification factor of the amplifying unit 7.

The amplifying unit 6 performs processing such as amplification on the audio signal input from the branch point 2 and outputs the processed audio signal to the headphones 32.
The amplifying means 6 includes an amplifying unit 9 that amplifies an input audio signal, and a volume 10 that controls the amplification factor of the amplifying unit 9.

The buffer 3 is interposed between the branch point 2 and the amplification means 5.
The buffer 3 keeps the impedance of the audio signal from the branch point 2 to the amplification means 6 constant even when the amplification means 5 operates the volume 8 to change the amplification factor 7. It acts to gain.

The buffer 4 is interposed between the branch point 2 and the amplification means 6.
The buffer 4 keeps the impedance of the audio signal from the branch point 2 to the amplification means 5 constant even when the amplification means 6 operates the volume 10 to change the amplification factor 9. It acts to gain.

  A super audio CD player device 21 is connected to the front stage of the audio signal processing device 1. That is, the audio signal processing apparatus 1 is configured to receive an audio signal as a source from the super audio CD player apparatus 21.

Reference numeral 22 denotes a rotation driving means, 23 a pickup means, 24 a decoder, 25 a D / A converter, and an amplifying means 26 including a low-pass filter.
Reference numeral 27 denotes a super audio CD recording medium.

  A speaker 31 is connected to the amplification means 5 side and a headphone 32 is connected to the amplification means 6 side after the audio signal processing apparatus 1.

The connection relationship between the audio signal processing device 1 and other devices at the front and rear stages is configured as described above.
Hereinafter, functions when the audio signal processing apparatus 1 is connected to the front stage with the super audio CD player apparatus 21 and the rear stage with the speaker 31 and the headphones 32 will be described.

An operator (audience) confirms each connection of the audio signal processing device 1, the super audio CD player device 21, the speaker 31, and the headphones 32, and turns on the power switch of each device to supply power.
Here, the desired super audio CD recording medium 27 is reproduced using the super audio CD player device 21.

The super audio CD player device 21 sends an audio signal obtained by reproducing the super audio CD recording medium 27 to the audio signal processing device 1.
The audio signal processing apparatus 1 distributes the audio signal sent from the super audio CD player apparatus 21 to the amplifying means 5 side and the amplifying means 6 side at the branch point 2.

One of the audio signals distributed at the branch point 2 enters the buffer 3 and undergoes impedance conversion, and then proceeds to the amplification means 5.
Here, in the buffer 3, the audio signal output with respect to the input audio signal has a similar or congruent waveform. The essence of this is kept constant, and there is no situation where the audio signal is substantially changed.

The audio signal before being input to the buffer 3 is a high impedance input, and it is possible to avoid affecting the system of the audio signal flowing from the branch point 2 to the amplifying means 6.
On the other hand, the audio signal output from the buffer 3 has a low impedance output, and is configured to absorb load fluctuations on the output side due to the operation of the volume 8 of the amplification means 5.

  Therefore, one of the audio signals whose impedance is converted by the buffer 3 maintains the same waveform as that of the audio signal from the super audio CD player device 21, and the amplifying means 5 operates the volume 8 to convert the amplification factor. Even if the amplifying unit 7 performs an amplifying action in response to the operation, the other audio signal, that is, the audio signal flowing from the branch point 2 to the buffer 4 is not affected.

  Therefore, as a result, even if a person who is listening to the audio signal sent from the super audio CD player device 21 using the headphones 32 operates the volume 8 of the amplifying means 5 while listening, It is not affected by the operation. On the other hand, the speaker 31 corresponds to the audio signal from the super audio CD player device 21 and outputs the audio amplified by the amplifying means 5.

On the other hand, the other of the audio signals distributed at the branch point 2 proceeds to the amplifying means 6 side, enters the buffer 4, undergoes impedance conversion, and then proceeds to the amplifying means 6.
Here, in the buffer 4, the audio signal output with respect to the input audio signal has a similar or congruent waveform. Therefore, in the audio signal flowing from the branch point 2 to the amplifying means 6, the reproduction content of the audio signal The essence of this is kept constant, and there is no situation where the audio signal is substantially changed.

Further, the audio signal before being input to the buffer 4 is a high impedance input, and it is possible to avoid affecting the system of the audio signal flowing from the branch point 2 to the amplifying means 5.
On the other hand, the audio signal output from the buffer 4 has a low impedance output, and is configured to absorb the load fluctuation on the output side due to the operation of the volume 10 of the amplification means 6.

  Therefore, one of the audio signals whose impedance is converted by the buffer 4 keeps the same waveform as that of the audio signal from the super audio CD player device 21, and the amplification means 6 operates the volume 10 for conversion of the amplification factor. Even if the amplifying unit 9 performs an amplifying action in response to the operation, the other audio signal, that is, the audio signal flowing from the branch point 2 to the buffer 3 is not affected.

  Therefore, as a result, even if a person who is listening to the audio signal sent from the super audio CD player device 21 using the speaker 31 operates the volume 10 of the amplifying means 6 during the listening, It is not affected by the operation. On the other hand, the headphones 32 correspond to the audio signal from the super audio CD player device 21 and output the audio amplified by the amplifying means 6.

  The audio signal processing apparatus 1 is configured by interposing buffers 3 and 4 between the branch point 2 and the amplifying means 5 and 6, but may be an amplifying means instead of the buffers 3 and 4.

The audio signal processing apparatus 1 has a speaker 31 connected to the subsequent stage of the amplifying means 5, but may be a headphone, or a speaker and a headphone.
The audio signal processing apparatus 1 has one amplification means 5 and 6 connected to the subsequent stage of the buffers 3 and 4, respectively, but may have a configuration in which a plurality of amplification means are connected if desired.

  The audio signal processing apparatus 1 is supplied with an audio signal from the super audio CD player apparatus 21, but may be a CD player apparatus, a DVD player apparatus, a tuner, or the like.

FIG. 2 is a block diagram illustrating a configuration in which a super audio CD player device is connected to the front stage of the embodiment of the present invention, and a speaker and headphones are connected to the rear stage. It is a figure equivalent to FIG. 1 explaining a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Audio | voice signal processing apparatus 2 Branch point 3, 4 Buffer 5, 6 Amplifying means 8, 10 Volume 21 Super audio CD player apparatus 31 Speaker 32 Headphone

Claims (1)

The input audio signal is branched into two at the branch point, and one of the branched audio signals is on the side of the first amplifying means for amplifying the audio signal to the speaker or / and the headphones, and the other is the headphones. Even when the second amplifying means is operated between the branching point and the second amplifying means, respectively, on the side of the second amplifying means for amplifying the audio signal to An audio signal processing apparatus in which a buffer or an amplifying means capable of keeping the impedance of the audio signal from the branch point to the first amplifying means side constant is interposed.

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