KR100248613B1 - Audio signal multiplexing circuit - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an audio information multiplexing circuit, comprising: receiving and selectively outputting multi-channelized R / L audio information from an information server to selectively output various audio information transmitted on multiple channels at an information server side. An audio multiplexer section 40 having first and second analog multiplexers 402 and 404, and an audio channel for generating an audio channel selection signal for selecting multichannel audio information applied to the first and second analog multiplexers 402 and 404. A display element driver 20 for displaying a channel number corresponding to the audio channel selection signal generated by the selector 10, the audio channel selector 10 on the fluorescent display element 30, and the audio channel selector Adjusting / amplifying the audio information selected by (10) and outputted from the first and second analog multiplexers 402 and 404 of the audio multiplexer section 40, respectively. An audio output unit 60 including an amplifier 614, and a reset signal generator 50 for initializing the audio channel selection signal when the maximum channel selectable by the audio channel selection unit 10 is reached. It is configured to include.

Description

Audio Information Multiplexing Circuit

The present invention relates to an audio information multiplexing circuit, and more particularly, to an audio information multiplexing circuit that can be applied to selectively listen to various voice information and / or music information provided from a plurality of audio information servers.

Recently, a new information service type in which a plurality of information servers provide various information to a subscriber terminal through a telephone line has been widely spread. For such information server, a subscriber terminal is assigned to a specific information server. When the subscriber accesses the subscriber's number and makes a line connection, the specific information server can listen to the edited voice information to obtain desired information.

The voice information provided by such an information server includes sports related information, music related information, travel information, securities / financial information, and the like.

In addition, the form of a music specialty server that transmits the audio signal related to the music in a multi-channel is also well known state, the music specialty server, if the music of various genres are simultaneously transmitted through the multi-channel, the music A subscriber connected to a specialized server by wire can set a music channel of a specific genre and listen to a desired music signal.

Therefore, an audio information multiplexer for selecting a music genre of multiple channels must be provided on the subscriber side connected to the music specialized server in a wired manner. In addition, since many information servers that provide various voice information through a telephone line usually have a system of providing voice information only through individual line connection, the subscriber terminal can receive information on each information server in order to listen to specific field information. The hassle of having to set a call path by key-operating assigned call number. Therefore, the emergence of an integrated voice information server that integrates various information provided by each information server and provides them in a multi-channelized form is preferable. In that case, the voice information provided in the multi-channel form in the integrated voice information server is preferable. There is a need to provide a multiplexing function of audio information for selecting a specific channel and listening to necessary voice information.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide an audio information multiplexing circuit for selectively listening to voice information or music information provided by multichanneling from each voice information server or a music specialized server. There is this.

In order to achieve the above object, according to a preferred embodiment of the present invention, an audio multiplexer unit having first and second analog multiplexers for receiving and selectively outputting multi-channelized R / L audio information from an information server, An audio channel selector for generating an audio channel select signal for selecting multi-channel audio information applied to the first and second analog multiplexers, and a channel number corresponding to the audio channel select signal generated by the audio channel selector; An audio output unit including a display element driver configured to be displayed on the display, an amplifier selected by the audio channel selector and configured to adjust / amplify the audio information output from the first and second analog multiplexers of the audio multiplexer; The audio when the maximum channel selectable by the audio channel selector is reached An audio information multiplexing circuit is provided that includes a reset signal generator for initializing an erroneous channel selection signal.

Preferably, the audio channel selector comprises: a switching element for selecting a channel of audio information, a Schmitt trigger for waveform shaping / level inversion at each switching operation of the switching element, and waveform shaping and level of the Schmitt trigger. And a binary counter for binary counting the inverted pulse signal to generate the audio channel selection signal.

The reset signal generator may include a first AND gate configured to perform logic AND processing on an audio channel selection signal output from the first and second output terminals of the binary counter, and an audio channel selection output from the third output terminal of the binary counter. A second AND gate for logic AND processing the signal and the output of the first AND gate, a Schmitt trigger for waveform shaping and level inversion of the output of the second AND gate, a first diode having one end connected backward to the Schmitt trigger, a power supply A resistance trigger for connecting a potential of (Vcc) to the other end of the first diode, and a waveform triggered by waveform shaping and level conversion of the potential formed by the first diode and outputting it as a reset signal to the reset end of the counter. It is configured to include.

Preferably, the reset signal generation section is further provided with a potential stabilization system for stabilizing the potential of the reset signal for the counter, and the potential stabilization system receives the power supply Vcc through a resistance to modify the waveform. And a plurality of serially connected Schmitt triggers for level inversion processing, and a second diode having one end connected backward to a final output of the series connected Schmitt trigger and the other end connected in common with the first diode. do.

According to the audio information multiplexing circuit according to the present invention having the above-described configuration, the fluorescent display element displays the current selected channel under the driving of the display element driver in accordance with the count result output from the binary counter in response to the operation of the switching element. The audio information of the channel corresponding to the count result is output from the first and second analog multiplexers of the audio multiplexer and output through the audio output unit.

1 is a diagram illustrating an audio information multiplexing circuit according to a preferred embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10: audio channel selector, 20: display element driver,

30: fluorescent display element, 50: reset signal generator,

60: audio output unit, 102: switching element,

116: binary counter, 504,506: AND gate,

402,404: first and second analog multiplexers,

508, 512, 520, 522: Schmitt triggers.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in detail.

1 is a diagram illustrating an audio information multiplexing circuit according to a preferred embodiment of the present invention.

In the figure, reference numeral 10 denotes an audio channel selector for selecting a specific channel when various voice information is provided in multiple channels from the information server, and the audio channel selector 10 is a push button type switching element ( 102, a resistor 104 for biasing the power supply Vcc, a resistor 106 for forming a potential interposed between the resistor 104 and the switching element 102, and one end of the resistor 104 The charging / discharging capacitor 108 connected to the ground potential side of the switching element 102 and the other end of the switching element 102 via the resistor 110 connected to the resistor 104. Counting the channel selection signal provided from the first and second Schmitt trigger elements 112 and 114 and the second Schmitt trigger element 114 connected in series to provide a waveform-shaped channel selection signal for each operation of the switching. Of channels selected by device 102 The binary count for generating a result for the information consists equipped with a counter 116.

In Fig. 1, reference numeral 20 is connected to the binary counter 116 of the audio channel selector 10 to generate a display signal for the channel number currently being selected in response to the count result of the counter 116. A display element driver for driving the fluorescent display element 30 is shown, and R1-R7 represents a bias resistance with respect to the display signal generated by the display element driver 20.

Reference numeral 40 is an analog multiplexer section for selectively outputting audio information of a channel corresponding to the count result provided by the binary counter 116 of the audio channel selector 10. The analog multiplexer section 40 provides information. The first analog multiplexer 42 connected through the resistors R8-R13 and the DC coupling capacitors C1-C16 for the multichannel voice information provided from the server side and the multichannel provided from the information server side. And a second analog multiplexer 44 connected to the voice information via resistors R14-R19 and DC coupling capacitors C7-C12, wherein the first and second analog multiplexers 42, 44 are provided. ) Receives the count result provided by the binary counter 116 at each input terminal D1-D3 and outputs voice / music information of the channel corresponding to the count result through the output terminal Out.

50 indicates a reset signal generator for initializing the counter 116 when the count result provided from the binary counter 116 of the audio channel selector 10 indicates the maximum value. Reference numeral 50 denotes a first AND gate 504 having a resistor 502 for forming a reset signal potential from a power supply Vcc, an input connected to first and second output terminals of the counter 116, and a first AND thereof. The second AND gate 506 having an input connected to the output terminal of the gate 504 and the third output terminal of the counter 116, and the Schmitt trigger connected to the output side of the second AND gate 506 to perform waveform shaping and inversion processing. 508, the first diode 510 reversely connected between the Schmitt trigger 508 and the resistor 502, and the potential across the first diode 510 is waveform-shaped and level-inverted to counter the counter. Including a Schmitt trigger 512 serving as a reset signal of 116. It is.

Preferably, the reset signal generation unit 50 is further provided with a potential stabilization system for stabilizing the reset potential applied to the first diode 510, the potential stabilization system to the power supply (Vcc) A resistor 518 having one end connected between the series-connected resistor 514 and the capacitor 516 for potential smoothing, the Schmitt triggers 520 and 522 connected in series with the other end of the resistor 518, and the Schmitt One end is reversely connected to the trigger 522 and the other end thereof includes a second diode 524 commonly connected to the resistor 502 and one end of the first diode 510.

In addition, 60 is an audio output unit which sets and amplifies and outputs audio information or music information of a specific channel provided at the outputs (Out) of the first and second analog multiplexers (402, 404). ) Is included in the voice signal or the music signal in a state where the level of the voice / music signal of the first analog multiplexer 402 is superimposed at a potential provided at the nodes of the resistors 602 and 604 connected in series to the power supply Vcc. A DC coupling capacitor 606 for coupling the DC level, a first variable resistor 608 for varying the volume of the DC coupled voice / music signal, and a rear end of the first variable resistor 608 ( 610 and a stereo amplifier 614, one end of which is connected via a capacitor 612, the level of the voice / music signal of the second analog multiplexer 404 is supplied via a resistor 616 of the power supply (Vcc) The voice signal in the state of overlapping potential or A second variable resistor 620 including a DC coupling capacitor 618 for coupling the DC level included in the bad signal, and a second variable resistor 620 for varying the volume of the DC coupled voice / music signal. The resistor 622 and the capacitor 624 are connected to the other end of the stereo amplifier 614.

Next, the operation of the audio information multiplexing circuit according to the present invention having the above-described configuration will be described.

First, if the switching device 102 of the audio channel selection unit 10 is not operated in a state where a power supply Vcc is applied to the audio information multiplexing circuit shown in FIG. 1, the counting operation of the counter 116 is not performed. And the count result is set to the initial value '000', and accordingly, the initialization channel number '0' is displayed on the fluorescent display element 30 driven by the display element driver 20. In this state, the first and second analog multiplexers 402 and 404 of the analog multiplexer section 40 are connected via the corresponding resistors R8-R13; R14-R19 and capacitors C1-C6; C7-C12. Channel music information / voice information is applied.

In this state, whenever the switching element 102 of the audio channel selector 10 is operated, the power supply Vcc becomes the ground potential through the resistor 106 and the switching element 102, and the switching element ( The capacitor 108 smoothes the level change of the power supply Vcc when the 102 is operated, and the potential in the form of a pulse for the operation of the switching element 102, which is represented through the resistor 110, is increased. Waveform shaping is performed at the Schmitt triggers 112 and 114 of the serial connection, and the level is reversed, and a pulse signal corresponding to the number of operations of the switching element 102 is applied to the binary counter 116.

Accordingly, the binary counter 116 counts the pulse signal and sequentially increases the count value from '000' to '111' in response to the number of operations of the switching element 102 at the first to third output terminals. Will print The count result of the binary counter 116 is applied to the display element driver 20 so that the display element driver 20 responds to the operation of the switching element 102 on the fluorescent display element 30. The channel number to be currently selected is displayed, and the count result of the binary counter 116 is input to the input terminals D1-D3 of the first and second analog multiplexers 402 and 404 of the audio multiplexer unit 40. Is applied to.

In this case, the first and second analog multiplexers 402 and 404 select a multi-channel voice / music signal in response to the count result applied from the counter 116, and output the audio output unit 60 through the output terminal Out. Will be printed).

The R-voice / music signal applied by the first analog multiplexer 402 overlaps with the potential formed at the nodes of the resistors 602 and 604 included in the audio output unit 60 so that the DC-coupled capacitor 606 receives a DC signal. The components are coupled, and the DC-coupled music / voice signal is adjusted to the volume set by the variable resistor 608 and then applied to the amplifier 614 through resistors 610 and 612 and amplified.

In addition, the L-voice / music signal applied by the second analog multiplexer 404 is applied to the audio output unit 60 and overlaps with the potential of the power supply Vcc applied through the resistor 616. A DC component is coupled in the coupling capacitor 618 and the amplifier (622) and the capacitor (624) are connected to the amplifier (622) with the DC-coupled voice / music signal adjusted in volume in the variable resistor (20). 614). Accordingly, the stereo voice / music signal amplified by the amplifier 614 is output through the corresponding speaker SP.

That is, the outputs of the first and second analog multiplexers 402 and 404 are selected while shifting the multi-channel audio / music signal corresponding to the number of operations of the switching element 102, and the audio / music of the selected channel is shifted. The music signal is amplified and output by the audio output unit 60 as a stereo signal.

On the other hand, when the switching device 102 reaches the maximum count result value (ie, '111') set in the counter 116 when the voice / music signal of a specific channel among the multi-channel voice / music signals is output. A low level is output from the first and / or second AND gates 504 and 506, and the low level signal is waveform-shaped and level inverted by the Schmitt trigger 508 to become a high level, together with the potential stabilization system. The potential of the power supply Vcc applied through the resistor 518 constituting the waveform is waveform-shaped and level-inverted by the Schmitt triggers 520 and 522, and a high level is applied to the second diode 524 side. Accordingly, the common connection point of the first and second diodes 510 and 524 is at a high level by the power supply Vcc applied through the resistor 502 due to the potential of the power supply Vcc applied through the resistor 502. Is maintained. In this case, in the Schmitt trigger 512, the potential of the high level is shaped and level reversed, and the low level is output. As a result, the binary counter 116 continuously executes a counting operation so that the switching element is performed. In response to the operation of 102, a count result for channel selection is output.

On the other hand, when the switching element 102 reaches the maximum count result value (ie, '111') set in the counter 116, the output of the first AND gate 504 of the reset signal generator 50 In addition to the high level, the output of the second AND gate 506 is also at the high level, and the high level output of the second AND gate 506 is waveform-shaped and inverted by the Schmitt trigger 508 to be at the low level. .

The low level signal is applied to the reversely connected first diode 510, where power Vcc applied through the resistor 502 is triggered by the first diode 502. 508 flows through the internal ground. At this time, the power supply Vcc through the resistor 518 is waveform-shaped and inverted by the Schmitt triggers 520 and 522 of the serial connection, and is applied to the second diode 524 connected backward.

Accordingly, the potential of the common connection point of the first and second diodes 510 and 524 is kept at a low level, and accordingly, the Schmitt trigger 512 generates a waveform-shaped high level reset signal to generate the counter 116. ) Will be initialized to '000'.

On the other hand, the present invention is not limited to the above-described examples, for example, the binary counter 116 is selected by the switching operation of the switching element 102 when adopting a type having a more extended output stage as needed. It is desirable if the number of possible channels can be increased, and correspondingly, the number of inputs of the first and second analog multiplexers 402, 404 is also increased.

In addition, the present invention has been described in the case of selecting and outputting audio / audio audio information provided from the information server, but it can be applied similarly to the case of digital data communication.

As described above, according to the audio information multiplexing circuit according to the present invention, it is possible to receive necessary audio information by selection of a specific channel while connected to an information server that provides voice information or music information in a multi-channel form. Therefore, it is possible to receive the information more easily from the audio information server which provides various information, especially through the telephone line.

Claims (4)

An audio multiplexer section (40) having first and second analog multiplexers (402, 404) for receiving and selectively outputting multi-channelized R / L audio information from an information server; An audio channel selector 10 for generating an audio channel select signal for selecting multi-channel audio information applied to the first and second analog multiplexers 402 and 404, A display element driver 20 for displaying a channel number corresponding to the audio channel selection signal generated by the audio channel selector 10 on the fluorescent display element 30; Audio including an amplifier 614, which is selected by the audio channel selector 10 and adjusts / amplifies the audio information output from the first and second analog multiplexers 402 and 404 of the audio multiplexer 40. An output unit 60, And a reset signal generator (50) for initializing the audio channel selection signal when the maximum channel selectable by the audio channel selection unit (10) is reached. 2. The audio channel selector (10) according to claim 1, wherein the audio channel selector (10) comprises a switching element (102) for selecting a channel of audio information and a series of waveform shaping / level inversion for each switching operation of the switching element (102). And a binary counter 116 for binaryly counting the waveform trigger and waveform inverted waveforms of the Schmitt trigger 114 of the connection and generating the audio channel selection signal. An audio information multiplexing circuit. 3. The first AND of claim 1 or 2, wherein the reset signal generator 50 performs a logic AND process on the audio channel selection signal output from the first and second output terminals of the binary counter 116. A second AND gate 506 for performing logical AND processing on the gate 504, the audio channel selection signal output from the third output terminal of the binary counter 116, and the output of the first AND gate 504, and the second AND gate. A Schmitt trigger 508 for waveform shaping and level inverting the output of 506, a first diode 510 whose one end is connected backward to the Schmitt trigger 508, and a potential of a power supply Vcc A Schmitt trigger for waveform-shaping and level inverting the resistance 502 connected to the other end of the diode 510 and the potential formed at the other end of the first diode 510 as a reset signal of the counter 116. 512, the audio information multiplexing circuit comprising: . The method of claim 1, wherein the reset signal generator 50 is further provided with a potential stabilization system for stabilizing the reset potential formed on the other end of the first diode 510, the potential stabilization system is the power supply A plurality of series-connected Schmitt triggers 520 and 522 that receive (Vcc) via the resistor 518 and waveform-shape and level-invert, one end connected backward to the final output of the series-connected Schmitt trigger 522. Audio information multiplexing circuitry comprising: a second diode (524).

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