JPH07303223A - Sound unit - Google Patents

Abstract

PURPOSE:To operate a sound function in accordance with a sound mode even if a user does not operate it by giving the sound function to a signal selected by switching a signal circuit in accordance with the signal mode of sound multiplex and the like. CONSTITUTION:A micro controller 10 receives the sound discrimination output of a sound processing circuit 11. When a broadcasting mode in the middle of reception is stereo broadcasting, an L-R signal selected by a change-over switch 4 is phase-shifted by a phase shift circuit 5. An adder 6 and a subtracter 7 respectively add/subtract the phase-shifted signal to/from the L/R signals from an input terminal so as to sound-output them. During the reception of monophonic broadcasting, the changeover switch 4 inputs a monophonic sound signal to the phase shift circuit 5 and the phase is shifted. The monophonic signal from the input terminal is added with the phase-shifted signal in the adder 6 so as to output them. During the reception of sound multiplex broadcasting, the change-over switch 4 is grounded and the inputted signal is outputted as it is without operating it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to audio equipment such as a television receiver equipped with a surround function.

[0002]

2. Description of the Related Art Conventionally, a surround function has been proposed in which left and right input signals are calculated to obtain a feeling of sound spread. FIG. 9 is a block diagram showing a surround circuit of a television receiver currently mass-produced, for example. 1 in the figure
Is a left channel (hereinafter referred to as L channel) audio input terminal, 2 is a right channel (hereinafter referred to as R channel) audio input terminal, 3 is a subtractor, 4 is a changeover switch, 5
Is a phase shift circuit for changing the phase of the input audio signal by φ, 6 is an adder, 7 is a subtractor, 8 is a flow chart shown in FIG. 10, and is a microcontroller for controlling the changeover switch 4, 9 is used It is an operation unit for a person to operate.

Next, the operation will be described. When stereo audio is input, an L channel audio signal (hereinafter referred to as L) is input from the audio input terminal 1 and an R channel audio signal (hereinafter referred to as R) is input from the audio input terminal 2. The difference signal L-R between the L channel and the R channel is created in the subtractor 3 from the input audio signal and is output to the contact a of the changeover switch 4. When stereo sound is input to the surround circuit, the user operates the operation unit 9 to select stereo in step 15 of the flowchart of FIG. By the control of the microcontroller 8 by the operation of the operation unit 9, the changeover switch 4 selects the L-R signal of the contact a in step 4. The phase of the L-R signal selected by the changeover switch 4 is φ-shifted by the phase shift circuit 5, and an audio signal of φ (L-R) is produced. The adder 6 adds the L signal from the input terminal 1 and the φ (LR) signal, and outputs an L + φ (LR) audio signal. On the other hand, the subtracter 7 subtracts the R signal from the input terminal 2 and the φ (LR) audio signal, and outputs an R-φ (LR) audio signal. As described above, the surround function is realized when stereo sound is input.

On the other hand, a monaural audio signal (hereinafter referred to as M)
Is input, the same audio signal is input from the audio input terminals 1 and 2. When the user operates the operation unit 9 to select monaural, the process proceeds to step 16 in step 15 and the monaural audio signal is selected. Therefore, in step 5, the changeover switch 4 is contacted by the control of the microcontroller 8. Select R for c. At this time, the audio signals input to the input terminal 1 and the input terminal 2 are monaural audio signals M, and therefore have the same audio. Therefore, when R of the contact c is selected by the changeover switch 4, the M signal is input to the phase shift circuit 5. The phase of the M signal input to the phase shift circuit 5 is φ-shifted here to become a φM signal. In the adder 6, the M signal and the φM signal from the input terminal 1 are added and an M + φM audio signal is output. Further, the subtractor 7 subtracts the M signal from the input terminal 2 from the sound signal of φM and outputs a sound signal of M−φM. As described above, the surround function is realized when monaural sound is input.

When the voice of the double voice multiplex is input,
When the user operates the operation unit 9 to select the dual audio multiplex, the process proceeds from step 16 to step 3, and the grounding (GND) of the terminal b is selected by the changeover switch 4 under the control of the micro controller 8 to output the L channel. , R channel output, the input signal is output as it is without any calculation. As described above, the surround function is turned off when the sound of the dual sound multiplex is input.

[0006]

The surround circuit of the conventional television receiver is constructed as described above,
Since the user is made to select the audio signal input to the phase shift circuit 5, if the user makes a mistaken operation or misrecognizes the currently received broadcast mode, the surround function cannot be activated and the There was a problem that it could not get the spread. For example, even if the input audio signal is a monaural audio signal, if LR is selected by the contact a in the changeover switch 4,
For monaural audio, the audio signal that is phase-shifted is L =
Since it is R, LR = 0, and the input voice is output as it is even if the arithmetic processing is performed.

The present invention has been made in order to solve the above-mentioned problems. Even if the user does not operate the audio signal input to the phase shift circuit according to the audio signal input. The object is to obtain an audio device having a surround circuit to be selected.

[0008]

The audio equipment according to the present invention is obtained by means for receiving or reproducing a signal corresponding to a plurality of signal modes such as an audio multiplex signal, a monaural signal, and the like. Discriminating means for discriminating the mode of the signal, switching means for switching the signal circuit controlled by the discriminating means in accordance with the signal mode, and providing a surround function for giving a surround function to the signal selected by the switching means. It is equipped with means.

In addition to the above-mentioned structure, the operation means by which the user can set the listening selection of the main voice or the sub voice at the time of listening to the multiplex voice multiple signal, and the main voice side or the sub voice depending on the setting of the operation means. A selection means for switching to the voice side is provided, and a surround function is given to the main voice or the sub voice set by the operation means by the surround function giving means.

Further, a pair of external input terminals for inputting signals corresponding to a plurality of signal modes such as a voice multiplexed signal and a monaural signal, and whether an input signal is given to both terminals of the external input terminals, or only one of them is applied. Detecting means for detecting whether or not the signal is given to the switch, switching means for switching the signal circuit according to the mode of the input signal by a signal from the detecting means, and a surround function for the signal selected by the switching means. It is provided with a surround function giving means.

Furthermore, means for receiving or reproducing a pair of channel signals including a plurality of signal modes such as a voice multiplexed signal and a monaural signal. Discrimination means for comparing the signals of both channels to discriminate between the audio multiplex mode and the monaural mode, switching means for switching the signal circuit controlled by the discrimination means according to the signal mode, and selection by the switching means A surround function giving means for giving a surround function to the generated signal is provided.

[0012]

In the audio equipment according to the present invention, even if the user does not set the audio multiplex mode or the monaural audio mode, this is automatically discriminated and the input signal to the phase shift circuit is switched. The control means for switching control inputs the difference signal between the left and right channel audio signals to the phase shift circuit in the case of a stereo audio signal input, and inputs the monaural audio signal to the phase shift circuit in the case of monaural audio input. The switching function is controlled to activate the surround function. In addition, when the dual voice multiple input is detected, the input to the phase shift circuit is not normally performed, but in the device equipped with the operation means capable of selecting only the main voice of the dual voice and the sub voice only. By detecting this selection by the control means and performing the same switching as in monaural, the main audio signal or the sub audio signal can be guided to the phase shift circuit to give a surround effect to the main audio or the sub audio.

[0013]

【Example】

Example 1. An embodiment in which the present invention is applied to a television receiver will be described below with reference to the drawings. In FIG. 1, 1 to 7 are the same as the conventional circuit shown in FIG. Reference numeral 10 denotes a microcontroller having the flow chart shown in FIG. 2. Reference numeral 11 denotes a pilot signal in stereo broadcasting and dual audio multiplex broadcasting, and the currently received broadcasting mode is stereo broadcasting or dual audio. The audio processing circuit includes a discriminating circuit for discriminating between multiplex broadcasting and monaural broadcasting, a detection circuit for receiving an audio carrier of the tuner 12 to perform audio detection, and an audio multiplex demodulation circuit. The audio processing circuit 11 is configured to output the main audio to the R output and the sub audio to the L output when receiving the dual audio multiplex broadcast. The output of the determination circuit (hereinafter referred to as an audio determination output) of the audio processing circuit 11, which determines whether the broadcast is stereo broadcast, monaural broadcast, or dual audio multiplex broadcast, is output to the microcontroller 10.
The L and R outputs that have been subjected to voice detection and voice multiplex demodulation are sent to the L input terminal 1 and the R input terminal 2 of the surround circuit, respectively.

Next, the operation will be described. In step 1 of the flow chart of FIG. 2, the microcontroller 10 receives the audio discrimination output of the audio processing circuit 11, and proceeds to step 4 if the broadcast mode of the audio of the currently received broadcast is the stereo broadcast, and the changeover switch. L of contact a at 4
-Select R. L- selected by changeover switch 4
The phase of the R signal is shifted by φ by the phase shift circuit 5, and an audio signal of φ (LR) is produced. The adder 6 adds the L signal from the input terminal 1 and the φ (LR) signal, and outputs an L + φ (LR) audio signal. On the other hand, in the subtractor 7, the R signal from the input terminal 2 and φ (L−
The audio signal of R) is subtracted, and the audio signal of R-φ (LR) is output. As described above, the surround function is realized when stereo sound is input.

On the other hand, if the broadcast mode of the audio of the currently received broadcast is not the stereo broadcast, proceed to step 2,
Determine whether the broadcast is monaural. In the case of monaural broadcasting, the process proceeds to step 5 and the changeover switch 4 is used to switch the contact point R
Select. At this time, the audio signals input to the input terminal 1 and the input terminal 2 are monaural audio signals M, and therefore have the same audio. Therefore, when R of the contact c is selected by the changeover switch 4, the M signal is input to the phase shift circuit 5. The phase of M input to the phase shift circuit 5 is φ-shifted here, and becomes a signal of φM. In the adder 6, the M signal from the input terminal 1 and the φM signal are added,
An audio signal of M + φM is output. Further, the subtractor 7 subtracts the M signal from the input terminal 2 from the sound signal of φM and outputs a sound signal of M−φM. As described above, the surround function is realized when monaural sound is input.

If the broadcast mode of the audio of the currently received broadcast is neither stereo broadcast nor monaural broadcast, it is a dual audio multiplex broadcast, so proceed to step 3.
The changeover switch 4 selects the ground (GND) of the contact b. At this time, for both the L channel output and the R channel output, the input signal is output as it is without any calculation, and the surround function is turned off.

As described above, even if the user does not operate
The changeover switch 4 can select an audio signal to be input to the phase shift circuit 5 depending on the broadcasting mode.

Example 2. FIG. 3 shows another embodiment of the present invention, in which 1 to 7 and 11, 12 are the same as in FIG. Reference numeral 13 is a microcontroller having a flow chart as shown in FIG. 4, and 14 and 15 are microcontrollers for inputting audio signals from the surround circuit.
Is a voice switch for switching under the control of, and 16 is an operation unit of the user. When the user receives the double voice multiplex, the user controls the voice switches 14 and 15 to hear only the main voice. It is possible to instruct the microcontroller 13 to select whether to listen to only the sub voice or both the main voice and the sub voice.

Next, the operation will be described. In the flowchart of FIG. 4, the microcontroller 13 receives the audio discrimination output of the audio processing circuit 11 in step 1, and if it determines that the broadcast is stereo broadcasting, the process proceeds to step 6 and the switch 14 selects the R output of the audio processing circuit 11. Then, the switch 15 selects the L output of the audio output, and proceeds to step 4.
Hereinafter, the same operation as the operation after step 4 in the first embodiment is performed to activate the surround function.

On the other hand, when the received broadcast is monaural broadcast, the process proceeds from step 2 to step 7, the microcontroller 13 performs the same control as in the case of stereo broadcast, and the switch 14 outputs the R output of the audio processing circuit 11. Then, the switch 15 selects the L output of the audio output circuit 11, and the process proceeds to step 5. Then, the same operation as the operation after step 5 in the first embodiment is performed to activate the surround function.

When the broadcast being received is a dual audio multiplex broadcast, when the user selects only the main audio in step 8, the microcontroller 13 determines in step 9 that both the switch 14 and the switch 15 are to be operated. The R output of the voice processing circuit 11 is selected, and the process proceeds to step 5. Hereafter, the same operation as when the broadcast mode is monaural is performed. If the user selects only the sub-voice, the process proceeds from step 10 to step 11, both switches 14 and 15 select the L output of the voice processing circuit 11, and the process proceeds to step 5. The process after step 5 is the same as when the broadcast mode is monaural. If the user has selected both the main voice and the sub voice, the process proceeds to step 3, and the following is the same as the operation after step 3 in the first embodiment. Therefore, according to this embodiment, in addition to the effects of the first embodiment, when the user selects either the main audio only or the sub audio only in the dual audio multiplex broadcasting, the changeover switch 4 operates The signal can be input to the phase shift circuit 5 to activate the surround function.

Example 3. FIG. 5 shows another embodiment of the present invention, which is an embodiment of a circuit having an external input terminal to which a signal from a VTR is applied. In the figure, 1 to 7 and 9 are shown in FIG.
This is the same as the conventional circuit shown in. Reference numeral 17 is a microcontroller having a flow chart as shown in FIG. 6, 18 is a pull-up resistor, 19 is an L channel audio input terminal connected to an external device, and 20 is an R channel audio input terminal connected to an external device. , 21 are mechanically opened when the L channel audio input terminal 19 is connected,
It is a detection switch that is mechanically closed when it is not connected. When the L-channel audio input terminal 19 is connected, the mechanical switch 21 is opened, and the terminal side of the pull-up resistor 18 connected to the microcontroller 17 has the same potential as the power supply voltage. When the L channel audio input terminal 19 is not connected, the detection switch 21 is closed and the terminal side of the pull-up resistor 18 connected to the microcontroller 17 is grounded.

Next, the operation will be described. In the flowchart of FIG. 6, in step 12, the pull-up resistor 18
Determine whether the connection terminal of is grounded. This is to determine whether the VTR connected to the external input terminals 19 and 20 is a monaural VTR or a stereo VTR. If grounded, L channel audio input terminal 19
Is not connected, and the audio signal input from the terminal 20 is monaural audio. Therefore, the process proceeds to step 5, and the following operation is the same as that of step 5 onward in the first embodiment, and the monaural surround function can be activated.

On the other hand, if the connection terminal of the pull-up resistor 18 is not grounded, it means that the L channel audio input terminal 19 is connected. In this case, the input audio signal is usually a stereo signal or a two-channel audio signal. Since it is one of the heavy audio signals, the surround function is activated in the case of stereo broadcasting by the change-over switch 4 as in the operation of the conventional circuit after step 15. In FIG. 5, the operation unit 9
6 and steps 15 and 16 are provided in FIG. 6, there is a case where a monaural voice is input while a stereo VTR is connected. In this case, the user can perform the same operation as the conventional one. This is to leave room for things to be done.

Example 4. FIG. 7 shows another embodiment of the present invention. In the figure, 1 to 7 are the same as those of the conventional FIG. 22 detects the output of the subtractor 3 and inputs it to the microcontroller, for example, an A / D converter, 23
Is a microcontroller configured by the flow chart shown in FIG. 8, and 24 is a user's operation unit for setting stereo broadcast or dual audio multiplex broadcast.

The operation will be described below. In step 14, the microcontroller 23 determines whether the data output from the A / D converter is 0. If it is 0, L = R, that is, since it is monaural broadcasting, the process proceeds to step 5, and the following gives a surround effect to monaural audio similarly to the operation after step 5 of the first embodiment. If it is not 0, the process proceeds to step 15. Since the user has selected either stereo or dual audio multiplex on the operation unit 24, if stereo is selected in step 15, it is step 4; otherwise, it is a dual audio multiplex signal. Therefore, the process proceeds to step 3, and the same operations as the steps 4 and 3 of the conventional example are performed. The A / D converter 22 has a function of detecting the output of the subtractor 3 and inputting it to the microcontroller 23, but if it has a function equivalent to this, the A / D conversion is performed. It is not limited to vessels.

[0027]

As described above, according to the present invention, the surround function can be automatically activated according to the voice mode even if the user does not select the voice signal.

Further, by providing means for selecting and setting the main voice and the sub-voice of the dual voice multiplex signal, a surround effect similar to that of monaural is applied to the main voice or the sub-voice at the time of receiving or reproducing the dual voice multiplex signal. Can be given.

Further, the circuit can be simply constructed in the case of discriminating between stereo and monaural by a mechanical switch or by comparing the audio signals of the left and right channels.

[Brief description of drawings]

FIG. 1 is a block diagram showing an audio processing circuit of a television receiver according to a first embodiment of the present invention.

FIG. 2 is a flowchart of a microcontroller used in the first embodiment.

FIG. 3 is a block diagram showing an audio processing circuit of a television receiver according to a second embodiment of the present invention.

FIG. 4 is a flowchart of a microcontroller used in the second embodiment.

FIG. 5 is a block diagram showing an audio processing circuit of a television receiver according to a third embodiment of the present invention.

FIG. 6 is a flowchart of a microcontroller used in the third embodiment.

FIG. 7 is a block diagram showing an audio processing circuit of a television receiver according to a fourth embodiment of the present invention.

FIG. 8 is a flowchart of a microcontroller used in the fourth embodiment.

FIG. 9 is a block diagram showing a surround circuit of a conventional television receiver.

FIG. 10 is a flowchart of a microcontroller of a surround circuit of a conventional television receiver.

[Explanation of symbols]

1, 2 audio signal input terminal, 3 subtractor, 4 changeover switch, 5 phase shift circuit, 6 adder, 7
Subtractor, 10 microcontroller, 11 audio processing circuit, 12 tuner, 13 microcontroller, 1
4, 15 voice switch, 16 main voice, sub voice selection operation part, 17 micro controller, 19, 20 external voice signal input terminal, 21 detection switch, 22 A /
D converter, 23 micro controller, 24 stereo, dual audio multiple selection operation unit.

Claims (4)

[Claims] 1. A means for receiving or reproducing a signal corresponding to a plurality of signal modes such as an audio multiplex signal and a monaural signal,
Discriminating means for discriminating the mode of the signal obtained by the receiving or reproducing means, switching means for switching the signal circuit controlled by the discriminating means in accordance with the signal mode, surround to the signal selected by the switching means An audio device comprising a surround function giving means for giving a function. 2. A means for receiving or reproducing a signal corresponding to a plurality of signal modes such as stereo, dual audio multiplexing, monaural, etc., a judging means for judging a mode of a signal obtained by the receiving or reproducing means, A switching means controlled by the discrimination means for switching the signal circuit in accordance with the signal mode, a surround function giving means for giving a surround function to the signal selected by the switching means, and a user is mainly used when listening to the dual audio multiple signal. Operation means capable of setting listening selection of voice or sub-voice, selection means for switching to the main voice side or the sub-voice side according to the setting of this operation means, the main voice or the sub-voice set by the operation means, An audio device, wherein a surround function is provided by the surround function providing means. 3. A pair of external input terminals for inputting signals corresponding to a plurality of signal modes such as audio multiplex signals, monaural signals, etc., wherein input signals are applied to both terminals of these external input terminals, or only one of them is applied. Detecting means for detecting whether the signal is given, switching means for switching the signal circuit according to the mode of the input signal by a signal from the detecting means,
An audio device comprising a surround function giving means for giving a surround function to a signal selected by the switching means. 4. A means for receiving or reproducing a pair of channel signals including a plurality of signal modes such as an audio multiplex signal and a monaural signal, and a method for comparing the signals of both channels to determine whether the audio multiplex mode or the monaural mode. Means, switching means for switching the signal circuit controlled by the discrimination means in accordance with the signal mode, and surround function giving means for giving a surround function to the signal selected by the switching means machine.