JPS5883411A - Automatic acoustic signal mixing selector - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic acoustic detection switching device;
The present invention relates in particular to a mixing selector circuit with a microcomputer for automatic attenuation and switching operation of a plurality of acoustic signals, without intending to limit the invention. This automatic switching selector device can be incorporated into an amplifier and/or tuner, or can be configured as a plug box that can be connected to the input/output jacks of an existing sound system.

A typical home entertainment system consists of a tape deck, record player, AM/FM stereo tuner, amplifier, and speakers. At parties and social events, it is often desirable to have background music consisting of FM radio broadcasts and/or records.

Constantly monitoring record changing equipment can be a hassle for hosts who change records or tune into an FM broadcast when a record is finished playing.

This problem exists not only in entertainment systems, but also in commercial broadcast stations where priority signal sources need to be monitored.

If the disc jockey is not present at the station when the record finishes playing, it is necessary to have another signal source automatically fade in or switch in.

In order to solve these problems, the 5r issued in 1974
U.S. Patent No. 8,809,812 to ILith Sr.
Several attempts have been made with somewhat sophisticated programming devices, such as those taught in "Programming Systems." Although such a device has utility in unmanned FM broadcast stations, the device is too expensive and complex for home use.

A more suitable solution to this problem is U.S. Pat. U.S. Patent No. 8,956,591 entitled ``Two-Man Automatic Source Selector for Stereo Entertainment Center''. However, the selection of sound sources in the Gatea patent relies on abruptly switching from one source to another when sound is detected in the priority source. The solution to this problem may be even worse than the problem itself;
The switching operation will be repeated during the pauses between songs on the record. Furthermore, if a record or tape is the preferred source, and unless a special switching operation is performed in which this source is already playing, the first few notes of this musical work are often cut out and the complete record is not available. I can't listen to it.

The present invention analyzes a monitored acoustic signal to determine whether a priority signal is present, determines the strength of this signal,
A relatively simple but ingenious method involving a microcomputer to determine whether the length of this signal is sufficient to justify fading out another signal and fading in the preferred signal. The present invention provides a solution to the aforementioned problems in a typical circuit. If the priority signal is a record player, the detection device monitors whether the record needle is still in the groove when a song ends to fade back again to another audio signal.

The present invention detects when the record stylus enters the groove of the record, or when there is tape noise in the preferred source's tape player, so that another, music source is immediately faded out and then the preferred source is switched on. A determination is made as to whether music is present. If music is present, the preferred source is faded in rather than being suddenly switched. On the other hand, if the stylus of the record player is still in the entry groove, the priority signal is switched in so that the first note is not skipped, thereby minimizing interference with the priority acoustic source.

As an example, consider a tuner as another audio signal and a record as a preferred audio signal.

The tuner is connected to a mixer, which in turn is connected to the amplifier's tuner input jack.

A record player is connected to an audio input jack, while a mixer is connected to a set of tape monitor jacks. Other audio sources such as tape decks can be connected to other tape or monitor jack inputs.

The tape monitor switch is now set to route the mixer's record player output through the tape monitor jack.

Thus, the mixer receives the other audio signal as input A from the tuner and receives the preferred audio signal as input B from the player via the tape jack. The mixer is also connected to a switchable output at the rear of the amplifier so that the mixer can be powered up by the amplifier.

If there is no signal on the input A side, the tuner signal is sent directly to the input jack of the tuner via an audio signal selector circuit and an output buffer for outputting sound to the speakers of the stereo system.

When playing a record, as soon as the stylus of the arm comes into contact with the surface of the record, an acoustic signal appears on the input A side, and this signal is sent through a mixer to form a composite signal in both the left and right channels, which is further combined with the signal. is sent through a Schmitt trigger circuit that sends it to the microcomputer. Through a digital comparison of the programmed amplitude level and the amount of time elapsed, the computer determines that a priority signal is present at input A and energizes an immediate acoustic selector circuit and a plurality of digital faders. to fade out the tuner signal. At this point, the input at A is checked again to see if music is present. If music is present, the priority signal at input A is faded in. On the other hand, if the record needle is still in the groove without playing music, the priority signal is switched in to pick up the first note on the record.

After the stylus is lifted from the record surface, the computer switches out the signal from input A and fades in the tuner signal at input B to provide a smooth transition from one source to another.

A tape monitor selector switch located on the amplifier may also be used to select another priority signal, such as a tape player or the like. If the user wishes to select another audio source other than the tuner, all that is required is to swap the input/output jacks.

Further features of the invention will become clearer from the brief description of the drawings.

Referring in detail to the drawings, reference number 1O, hereinafter referred to as a mixer, is used in the selection of priorities of sound 1 signal sources from devices such as a record player 14, a fifth unit 16, and a tape recorder 18. The mixer is generally shown working with or made as an integral part of the amplifier 12 used. When used with a stereo system, the mixer lO connects a first pair of tape jacks TI usually located at the rear of the amplifier 12.
includes a first pair of input jacks Jl and 12 operatively connected to the output jacks of the .

Mixer IO further includes a second pair of input jacks J8 and 14 connected to what is referred to as another audio signal source, shown as tuner 16 in FIG.

Mixer IO further includes a pair of output jacks J5 and 16, which in this case are also operatively connected to the tuner jack of amplifier 12. The mixer lO receives the power from the power supply 22 via the output section 20 arranged in the amplifier 1-2,
The amplifier further provides DC power at the voltage levels necessary to operate the circuit components described below. In this particular circuit, eight output levels are required, consisting of a first positive level Vl, a negative level V2 and a second positive level V8.

Generally, the mixer IO includes a pair of stereo human power buffers 24 and 26, referred to as acoustic human power A and acoustic human power B, respectively.

The acoustic outputs of buffers 24 and 26 are provided to an acoustic signal selector switch 28 whose output is returned to amplifier 12 via output buffer 80. , the output of the stereo capacitor 24 is also connected to the mixer/detector circuit 8.
2 input side.

The output of computer process chip 84 is returned to mixer 82 and also provided to output latch circuit 86. At this time, the latching circuit 36
is operatively connected to output buffer 80 via digital circuitry 88.

In FIG. 8, jacks Jl, J2, J8 and J
Input x 7a 24 and 26 which receives its input via 4
provides signal and impedance matching, DC offset voltage isolation, and acoustic signal dynamic range enhancement functions.

Input buffers 24 and 26 generally include input jacks, 71 . operational amplifiers Ul, U2, U8 and U4 which receive their acoustic input signals from J21.78> and J4;
including.

The signal entering jack Jl passes through capacitor C1 and resistor R1, which blocks the offset voltage, to operational amplifier U.
capacitor CI and resistor R1 form a high-pass filter that prevents low frequency noise from entering the mixer, and resistor R2 grounds the acoustic signal load. The output of operational amplifier Ul is fed back to its negative input via resistor R8, resistors R8 and R4 acting as a voltage divider to control the gain of amplifier Ul.

The backers, including operational amplifiers U2, U8, and U4, are similarly constructed with similar functions, and their components are designated with the suffixes α, b, and c, respectively.

The outputs of the audio signal amplifiers U11U2, U8 and U4, labeled as A, BIC and D in FIG. 18 (7), are operatively connected to the input side of the audio signal selector 28. The acoustic signal selector 28 comprises four analog switches S1-, S2, R8, each operatively connected to the output of an operational amplifier U11U2, U8 and U4, respectively.
Oh C! Includes S4.

The switches S1 and 521ri are wired to be actuated simultaneously by signals from the output latch circuit 85 via the line 40, but the switches S8 and 84 receive the output from the output latch circuit 86 via the line 42 as shown in FIG. Operated simultaneously by signals. The outputs of switches S1 and 88 are coupled together as a first input to output buffer circuit 80 via line 44, and the outputs of switches S2 and 84 are coupled as a first input to output buffer circuit 80 via line 46. 2
The combination is fed as an input.

Therefore, if switches Sl and 82 are closed,
The output signal from the input buffer 24 is sent directly to the output buffer 8.
Sent for 0. On the other hand, if switches S3 and 84 are closed, the output from input buffer 26 is sent directly to output buffer 80.

Output buffer 80 typically includes a pair of operational amplifiers U5 and U6.
including. The acoustic signal from the line 44 is connected to the current split resistor R
5 to the positive input of operational amplifier U5. The positive input to operational amplifier U5 is also operatively connected to one output of digital fader circuit 88 for certain purposes explained below. The output of the arithmetic logic amplifier U5 is connected to an impedance matching resistor R whose output is provided as a negative input feedback to the arithmetic amplifier U5.
Flows through 6.

The output of resistor R6 is then sent to capacitor C2 which acts to block the DC offset voltage and forms a high pass filter in conjunction with resistor R6. This output is then applied to output jack J5 as shown in FIG.

The operational amplifier U6ffi receives its input via line 46 and operates in substantially the same manner as previously described. Components associated with operational amplifier U6 are designated with the suffix α. As previously mentioned, the positive input to operational amplifier U5 is connected via line 48 to one of digital fader circuits 88.
The input to the operational amplifier U6 is connected to the digital amplifier 88 via the circuit +150.
operatively connected to a second output of the.

Digital fader circuit 88 includes a first set of analog switches S5, R6, S7 and R8 connected on one side to parallel load resistors R7, R8, R9 and RIO, said resistors being coupled together. , and further arithmetic amplifier U5
is operatively connected to an output line 48 which is connected to the input side of the . Switches S5, R6, S7 and R8 connect lines 52, 54, 56, respectively, from output latching circuit 86.
．． They can be actuated simultaneously or sequentially by output signals from 58.

The digital ° fader is the same switch S5 of the second set.
α, S6α, S7α and S8α, the operators of which are also respectively connected to the line '52.54.56.58;
One side of the switch has parallel resistances R7α and S8α, respectively.
, S9α and R1Oα. The resistors are coupled together and attached via circuit 1550 to the input of operational amplifier U6.

Next, according to FIG. 4, the mixer circuit is connected to switch S9.
It includes a pair of stages of operational amplifiers U7 and U8 connected to a switching circuit including 5lO1Sll and S12.

The outputs from the input buffers 24 are each connected to a pair of resistors 7?
11 and R12 are connected together so as to flow through them, and are applied as a composite input to the negative side of the operational amplifier U7. The positive side of the operational amplifier U7 is grounded through a resistor 7-1B, and is also connected to a microcomputer 84 through a resistor R14. The output of operational amplifier U7 is fed back to its negative input via resistor 7-15 to set the gain of the operational amplifier.

The amplified output of operational amplifier U7 is sent to ground forming a low pass filter via resistor 7-16 and capacitor C8. Next, resistor 7i'16 and capacitor 08
The junction between them is provided as an input to the negative side of operational amplifier U8 via resistor R17. The output of operational amplifier U8 is then again applied to its positive input via resistor R18. The positive input to operational amplifier U8 is also connected to resistor R19.
resistors R18 and 7?19 form a voltage divider that sets the reference voltage for operational amplifier U8.

This reference voltage applied to the positive input of operational amplifier U8 is also connected to both switches S9 and to one side of S'IO.

The input to the negative side of the operational amplifier U7 is a switch, S'
ll(!:, given to one side of S'12. Switch S
91. The functions of S'lO1, S'll, and S12 are provided from the microcomputer circuit 84 via lines 60.61 and 62.68, respectively.

The opposite sides of switches S9 and SlO are provided with resistors R20 and R21, respectively, which are coupled together and operatively connected to the output of operational amplifier U8. Switch Sll and 812
The opposite side of is connected to resistors R22 and R28 which are further connected together and operatively connected to the output of operational amplifier U7.

The output of the microcomputer circuit 84 is connected to the switch of the mixer circuit, S'll, via lines 68 and 62, respectively.
and S'12. The output of computer circuit 34 is also routed to mixer circuit 8 via lines 60 and 61.
It is connected to switch S9 of No. 2 and S'IO.

The output of the operational amplifier U8 is connected via a resistor 7-24 to the pace of the NPN transistor Ql. The pace of transistor Ql is grounded through resistor R25 and reverse biases diode Dl connected in parallel. The collector of transistor Ql is a microcomputer circuit 84
and its emitter is grounded.

Thus, circuit 82 provides a mixer and Schmitt trigger combination. If the output voltage level from operational amplifier U8 is higher than the reference voltage present at the positive input of said operational amplifier, the Schmitt trigger is in a first logic state. If the voltage present at the output of operational amplifier U8 becomes less than the reference voltage level at the positive input of operational amplifier U8, the Schmitt trigger changes to the opposite logic state.

If the output of operational amplifier U8 is a negative voltage, this output is grounded through resistor R24 and diode Dl, reverse biasing transistor jQ1. transistor Q
When a positive voltage is present at the pace of l, the transistor Q
l is forward biased and its collector input to microcomputer 84 is grounded to zero port. Therefore, if the output signal at operational amplifier U8 is outside the threshold band set by resistor R18,
A series of software routines described below will
Computer 84 selectively provides appropriate output voltages to a plurality of lines 64, 66, 68 and 70 operatively connected to output latching circuit 86, which further includes lines 52, 54, respectively. .56.58 to provide a serial signal to a digital fader circuit 38.

The voltage levels present at the inputs of operational amplifiers U5 and U6 are directly controlled by digital fader circuit 88 to sequentially attenuate or fade the acoustic signals present at these inputs. When the signals present at the inputs of operational amplifiers U5 and U6 have been almost completely attenuated, computer circuit 84 outputs signals along lines 72 and 74 to output latching circuit 86, and then to output latching circuit 86 along lines 72 and 74, respectively. and 42 to provide an output signal to the acoustic signal selector circuit 28, opening switches 58 and 54 and engaging switches Sl and 82.

The reference voltage threshold value in the operational amplifier U8 is the reference number 76.
and 78 are set at 10 or -8 volts in a slightly narrower range as shown in the first curve of FIG. Therefore, if the signal is greater than 10 or -8 volts at the output of operational amplifier U8, the signal biases transistor Ql in either direction or in the opposite direction to provide a square wave input to microcomputer circuit 84. is sufficient to give

Upon receiving this signal from record player 14, computer circuitry 84 also sets up a delay to ensure that the signal is present. If this signal holds the required delay time, the microcomputer provides a switching signal to the mixer circuit via lines 60 and 61 to close the contacts of switch Sll and S'12. To this end, resistors R22 and R2B are placed in parallel relation to resistor R15, thereby reducing the amplifying effect of operational amplifier U7. Therefore, operational amplifier U7 prevents the output waveform present at its output from saturating and clipping. This feature contributes to signal processing accuracy and does not affect the actual audio output present in the output buffer 80 in any way.

Computer circuitry 84 determines that a signal is still present on outputs 7a 24 and simultaneously outputs lines 64 and 6.
6. 68 and 70 provide sequential signals to the output latch circuit 34, which further provides a digital signal.
The switches of the fader circuit 88 are closed in sequence, and the switch S
5 and S5α are closed simultaneously, then switches S6 and 86
α is closed and a sequentially changing voltage is applied to the input sides of operational amplifiers U5 and U6 in a manner such as 111111, thereby attenuating the signal provided from the tuner. This signal attenuation is illustrated by the typical curve of FIG. 12, and it can be seen that four resistors in each digital fader circuit can produce up to 16 fader effects. The dotted line in FIG. 12 indicates a fading curve that is pleasing to the human ear. Naturally, the more resistors a digital fader circuit has, the more accurately it will follow this curve. The signal from the tuner decreases,
When the signal fades, simultaneous signals are sent from the computer to lines 72 and 7.
4 to an output latching circuit 86. This signal is then processed to be sent to lines 40 and 42 which act to close switches S1 and 82 and open switches S8 and 84 of the acoustic signal selector circuit. This state, in effect, connects the stereo output 2 from input buffer 24 to output buffer circuit 80 via switch Sl and 82.

At this time, the computer sends a signal along lines 6o and 61, which signals switch S9 and S9 of mixer circuit 82.
Resistance to closing lO/? 20 and °R21 are connected in parallel with a resistor 7-18, said resistor R18 serving as a feed to an operational amplifier U8 (which acts to widen the threshold band at the input).
As shown in the second curve of Figure 1, the threshold level is set to 10 or -12 ports, and the reference numbers 8o and 8
Indicated by 2.

Therefore, if there is a signal higher or lower than the threshold voltage levels 8o and 82, music will be played on the record player and the computer will be connected to the line. , 0.68.66.6
This condition acts to sequentially open the switches of the digital fader circuit 88 via the output latching circuit 86, thereby causing the record
Indicates that the music from the player will fade.

But on the other hand, if there is no signal after the threshold is widened, the real condition is that the record needle is still in the groove, but the needle has not reached the recording part of the music, thus fading the signal. This will indicate to the computer that there is no need to log in. In this case, the computer circuitry simultaneously supports signals on lines 70.68.66.64 and simultaneously unlaunches all switches in the digital circuitry 88, thereby causing the record player 1
All signals from 4 are sent to output buffer 8o.

Typically, the initial detection of the signal at the input buffer 24 is very small so that switching can occur before the record player's needle picks up the music so that the first note is not dropped as it is incorporated into the record player's signal. A delay is given.

Drawings, especially functional block diagrams, show priority signals as records and
Although indicated as a player, it should be noted that this priority signal could just as well be a tape player. However, tape noise between musical compositions will act to energize the system, just as a record stylus contacts the surface of a record.

After the switching operation occurs, the circuit will be tested to see if music is present in the input buffer circuit 24. If music is present, indicating that the signal level at the output of operational amplifier U8 is outside the threshold levels 80, 82 as shown in the graph of FIG.
The computer enters the handwriting delay loop, thus testing for the presence of music at the input side of the input buffer 24 for each handwriting.

If a test is made and no signal is present for the extended threshold limits 80 and 82, the computer
Sending signals along lines 0 and 61 to open switches SO and SL0, which will cause the threshold level to decrease to levels 76 and 78, also shown in FIG.

If a signal is present at this point, indicating that the record stylus is still in the groove, an end-of-record (EOR) counter is incremented, and if this value is indicated by number 40 in FIG. If it is smaller than the arbitrary value, switch S9 and SlO
expands its value to levels 80 and 82 by being closed again. If music is present on the priority input, the internal record gap time is detected and if the end of record increment is greater than the second arbitrary signal, the internal record counter is cleared. Again, input buffer 2
4, a test is performed to determine whether music is present and the circuit is completed. The circuit is repeated throughout the record playing to ensure that no switch action occurs when the player needle is still in place in the groove between songs on the record.

On the other hand, if it is determined that there is no music on the input side, the value level is reduced again by opening switches S9 and S10, and a test is performed to determine whether the record needle is in the groove or not. will be held. If the needle is not in the groove, a check is made to see if the internal gap time counter is below an arbitrary level. If the internal gap time counter is higher than this arbitrary level, select the acoustic signal! At this point, switches Sl and 82 are opened and switches S8 and 84 are closed, but at the same time all switches of digital fader circuit 88 are closed and the input of tuner 14 is applied to output buffer circuit 80 via the audio signal selector. Next, the computer sequentially opens the switches of the digital fader circuit 88, thereby fading in the signal from the tuner to the output buffer circuit 80 through 9. The computer also provides a reset signal through resistor R14 to mixer circuit 82, which strobes operational amplifier U7 which provides a signal to the computer, which also opens switches S'll and S12.

From the foregoing, the present invention provides an audio signal priority selection device that can be incorporated into existing stereo amplification equipment or packaged as a separate device, thereby providing It will be apparent that tape monitor jacks, tuner input jacks, etc. in standard equipment can be used without modification.

Furthermore, it will be apparent that the present invention provides an efficient and smooth transition between the preferred signal and another signal source in a manner that is both pleasing to the ear and reduces or eliminates unnecessary signal loss during the transition. .

Although the invention has been described with particular reference to the drawings, modifications from what is shown or suggested in the text may be practiced without departing from the spirit and scope of the invention.

[Brief explanation of the drawing]

FIG. 1 schematically shows an amplifier, a plurality of acoustic sources and an automatic mixer circuit according to the invention connected together; FIG.
8 is a system block diagram showing a mixer circuit according to the present invention, FIG. 8 is a circuit diagram showing an input buffer of the mixer of FIG. 2, and FIG. 4 is a circuit showing a priority detection device and a microcomputer of the mixer of FIG. 2. Figure 5 is a circuit diagram showing the audio signal selector, fader circuit, output bass sofa, and output latch of the mixer in Figure 2 (Figures 8 to 5 indicate connection lines between them with capital letters A to Figures 6 through 1θ are flow diagrams of the program for the micro combinator used in the circuit, and Figure 11 shows the adjustable threshold of the priority signal detector of the mixer shown in Figure 2. A glass showing the levels, and FIG. 12 is a graph showing the fade in and fade out curves followed by the digital 7ada. lO... Automatic audio signal mixer selection device (mixer), 12... Amplifier, 14... Record player, 16... Tuner, 18... Tape recorder, 20 -...Power supply outlet, 22...Power supply,
24.26...Stereo human buffer, 28...
・Acoustic No. 1 selector switching mechanism, 80...
Output sofa, 82 - mixer/detector circuit, 84
・・・Micro computer processor chip,
'85...Output latch circuit, 86...Output latching circuit, 88...Digital parameter circuit network, 40.42.44.46.48.50.52.54.
56.58.60-64.66.68.70.72.7
4...Line. % Grant [Person v Nmanonoku Corporation (1 other person) Procedural amendment - → February 3, 1950 Patent Application No. 7, 1952 #o6ri No. 1 Self-company ↑♂
J No. Already Sink...71 Omata 1 Kaifu 3, Relationship with the case of the person making the amendment Applicant's address Tako Miyaga Jyoun 7-no I (・Ko Ippon Runyong 4, Agent 5, Amendment order Date January 1980/1980 (Shipping date) (Attachment) +11 The [claims] of the specification are amended as follows: ``For selecting one of one or two audio input sources.'' an acoustic signal selection switching circuit of; a preferred source input circuit operatively connected to the acoustic signal switching circuit; another source input circuit operatively connected to the acoustic signal switching circuit; and a selected acoustic signal. an audio signal output circuit operatively connected to the audio signal switching circuit for outputting a signal; and a signal attenuation device operatively connected to the audio signal output circuit for selectively fading in and out the signal. a sensor circuit operatively connected to the priority source input circuit for detecting a signal; and a computer processor operatively connected to the acoustic signal switching circuit, the signal attenuator, and the sensor circuit; Upon detecting an audio signal present at the preferred source input, the processor activates a signal attenuator to fade out the other signal and activates a signal selection switching circuit to select the preferred input as the audio signal. An automatic mixer selection device connected to an output side and switching out the priority input and fading in the other signal at the same time as the signal disappears. 2. The audio input source is multi-channel. ' said audio signal selection switching circuit includes two sets of analog switches, each set having a switch for each channel of the audio signal, the first set being operatively connected to said priority source input circuit. 9. The apparatus of claim 1, wherein the second set is operatively connected to the other source power circuit. 3. The acoustic input source is a multi-channel acoustic both input circuits include input buffer circuits for the acoustic signals of each channel, each buffer circuit including a DC offset voltage and a high-pass filter including a series capacitor for blocking low frequency noise. 4. The apparatus according to claim 1, wherein the audio input source comprises a multi-channel audio signal, and the audio signal output circuit has an input of the selected amplifier connected to the signal attenuation device, 2. The apparatus of claim 1, wherein the amplifier output includes a high pass filter for noise rejection and impedance matching. 5. The signal attenuation device includes a digital fader circuit for each audio channel of the selected signal, the output of each digital fading circuit being operatively connected to one input of an operational amplifier of the audio output circuit. 5. The device according to claim 4, characterized in that: 6. Each digital fading circuit can be energized simultaneously to rapidly attenuate the signal at the input of each output buffer circuit, or can be operated sequentially to fade said signal in or out. 6. The device of claim 5, further comprising a plurality of parallel resistors. 7. The sensor circuit includes a mixer-amplifier to form a composite signal of all channels of the priority signal input, and a signal outside the amplitude threshold band to input the series of rectangular waves to the computer processor. and a trigger circuit for converting the wave into a wave.
9. The apparatus of claim 7, wherein the mixer amplifier includes a device for selectively adjusting gain by a processor of the computer. an operational amplifier having a feedback loop through a resistor, the device for selective gain adjustment including at least one switch and a resistor in parallel with the resistor of the feedback loop; 9. Device according to claim 8, characterized in that it is operable by a processor. 10. The apparatus of claim 7, wherein the trigger circuit includes a Schmidt trigger and includes a device for adjusting the amplitude threshold band thereof. 11. The Schmidt trigger includes an performance amplifier;
The threshold band is established by a feedback loop having a resistor, and the threshold band adjusting device includes at least one switch and a resistor in parallel with the feedback loop resistor, the switch being connected to a processor of the computer. Device according to claim 1o, characterized in that it can be operated by. 12. A selection circuit for selectively switching a plurality of acoustic sources, the selection circuit comprising: an output circuit; detecting an acoustic signal from one of the plurality of acoustic sources and coupling the signal to the output circuit; a sensor device; a selector device for selecting another source from the plurality of sources for detection by the sensor device in response to disappearance of an acoustic signal detected by the sensor device; and a selector device for selecting another source from the plurality of sources for detection by the sensor device; a fading device for, in response to detecting an acoustic signal, fading out the detected acoustic signal of another source; and coupling the other source to the output circuit, and coupling the one source from the output circuit. A circuit comprising: a switching device for separating; and a device for fading in the acoustic signal of the other source. 13. The circuit of claim 12, wherein said fading device comprises a device for selectively attenuating the acoustic signal amplitude of said another source. 14. The attenuation device comprises a plurality of resistors selectively operative to attenuate the amplitude of the acoustic signal of the another source, the attenuation device having a processor responsive to the device for detecting the acoustic signal of the other source. 14. The circuit of claim 13, wherein said plurality of resistors are selectively energized. 15. in response to a device for prioritizing one source of the plurality of sources over other sources; and a device for detecting an acoustic signal of the one source; (b) coupling the one source to the output circuit; e→ fading out the audio signal of the one source; 13. The circuit according to claim 12, comprising: an insertion device; 16. The detection device comprises: a multi-level threshold circuit having a first threshold for comparing signal amplitudes and a second threshold greater than the first threshold; and a comparison corresponding to internal record gaps, etc. a display device that displays that an acoustic signal is detected when the signal amplitude detected is greater than the first threshold value, and displays that an acoustic signal is not present when the signal amplitude is smaller than the first threshold value. The circuit according to claim 12 or 15. 17. A timer device for measuring the time during which the compared signal amplitude is between the first and second thresholds, and indicating disappearance of the acoustic signal when the measured time exceeds a predetermined time. The circuit according to claim 16. (2+ 1M narrow width) Correct the following points. Page Line Before correction After correction 12 2
10 10 (as shown in Figure 1) 13 7 1
0 10 (shown in Figure 2) 151235
36 22 13 53 and 54 S3 and S4 Procedural Amendments December 2, 1980 Kazuo Wakasugi, Commissioner of the Japan Patent Office 1, Indication of the case, Patent Application No. 110651, 1982, 2, Title of the invention: Automatic audio signal mixing selection device 3. Relationship with the case of the person making the amendment Patent applicant's address and name: Sanmartsuba Corporation 4. Agent (attachment) The scope of claims in the specification is amended as follows. 0. an audio signal selection switching circuit for selecting one of two audio input sources; a priority source input circuit operatively connected to said audio signal switching circuit; and operatively connected to said audio signal switching circuit. an audio signal output circuit operatively connected to the audio signal switching circuit for outputting the selected audio signal; and an audio signal output circuit operatively connected to the audio signal switching circuit for outputting the selected audio signal; a signal attenuation device operatively connected to the acoustic signal output circuit; a sensor circuit operatively connected to the priority source input circuit for detecting the signal; and a signal attenuation device operatively connected to the acoustic signal switching circuit, the signal attenuation device, and the sensor circuit. a computer processor connected to the input source, such that upon detection of an acoustic signal present at the preferred source input, the processor activates a signal attenuation device to fade out the other signal; A signal selection switching circuit is energized to connect the priority input to the audio signal output side, and at the same time as the signal disappears, the priority input is switched out and the other signal is faded in. 2. The audio input source consists of multi-channel audio signals, and the audio signal selection switching circuit includes two sets of analog switches, each set having a switch for each channel of the audio signal. Claim 1, wherein a first set is operatively connected to said preferred source input circuit and a second set is operatively connected to said further source input circuit f. 3. The acoustic input source consists of multi-channel acoustic signals, and the surface input circuit includes an input buffer circuit for each channel of acoustic signals, and each buffer circuit blocks DC offset voltage and low frequency noise. 4. The apparatus of claim 1, wherein the acoustic input source comprises a multi-channel acoustic signal, and the acoustic signal output circuit outputs a selected signal. an output buffer circuit for each audio signal channel, each buffer including an operational amplifier, the input of the amplifier being connected to the signal attenuation device, and the output of the amplifier being used for noise rejection and impedance. 5. The signal attenuation device includes a digital fader circuit for each acoustic channel of the selected signal, and includes a high-pass filter for matching the selected signal. 5. Device according to claim 4, characterized in that the output of the fading circuit is operatively connected to one input of an operational amplifier of the acoustic output circuit. 6. Each digital fading circuit can be activated simultaneously to rapidly attenuate the signal at the input of each output buffer circuit, or can be operated sequentially to fade said signal in or out. 6. The device of claim 5, comprising a plurality of parallel resistors. 7. The sensor circuit includes a mixer-amplifier for forming a composite signal of all channels of the priority signal input; and a trigger circuit for converting the wave into a wave.
Apparatus described in section. 8. The apparatus of claim 7, wherein the mixer amplifier includes means for selectively adjusting the gain of the computerophore processor. 9. The mixer amplifier includes an operational amplifier with a foot back loop through a resistor, and the device for selective gain adjustment has a foot back loop in parallel with the foot M, 9. Apparatus according to claim 8, characterized in that both act as a switch and a resistor, said switch being operated by a computer processor. 10. The trigger circuit includes a 7-unit type trigger to adjust its amplitude threshold band. 8. The device according to claim 7, characterized in that it comprises a device. 11. The Schmitt trigger includes an operational amplifier;
The threshold band is established by a feedback loop having a resistor, and the threshold band adjusting device includes at least one switch and a resistor in parallel with the feedback loop resistor, the switch being operated by a processor of the computer. 11. Device according to claim 10, characterized in that it is possible. 12. A selection circuit for selectively switching a plurality of acoustic sources, the selection circuit comprising: an output circuit; detecting an acoustic signal from one of the plurality of acoustic sources and coupling the signal to the output circuit; a sensor device; a selector device for selecting another source from the plurality of sources for detection by the sensor device in response to disappearance of an acoustic signal detected by the sensor device; and a selector device for selecting another source from the plurality of sources for detection by the sensor device; a fading device for fading out the detected acoustic signal of another source in response to the detection of a sound signal; and coupling said side source to said output circuit to output said one source to said output circuit; A circuit comprising: a switch device for separating from the circuit; and a device for fading in an acoustic signal of the source on the side. 136. The circuit of claim 12, wherein said fading device comprises a device for selectively attenuating the acoustic signal amplitude of said side source. 14, said attenuation device comprising a plurality of resistors selectively actuated to attenuate the acoustic signal amplitude of said side source, and having a processor responsive to said device for detecting said side source acoustic signal; 14. The circuit of claim 13 for selectively energizing the resistor. 15. The selector device is responsive to a device for prioritizing one source of the plurality of sources over another source and a device for detecting an acoustic signal of the one source, such that 0) the source on the side is (b) coupling the one source to the output circuit; (c) fading out the acoustic signals of the one source and another source while coupled to the output circuit; (b) coupling the one source to the output circuit; 13. The circuit according to claim 12, comprising: a device for inputting a source acoustic signal. 16. The detection device comprises: a multi-level threshold circuit having a first threshold for comparing signal amplitudes and a second threshold greater than the first threshold; and a comparison corresponding to internal record gaps, etc. a display device that displays that an acoustic signal is detected when the signal amplitude detected is larger than the first threshold, and displays that there is no acoustic signal when the signal amplitude is smaller than the first threshold; The circuit according to claim 12 or 15.

Claims (1)

[Claims] 1. An audio signal selection switching circuit for selecting one of two audio input sources; a priority source input circuit operatively connected to the audio signal switching circuit; another source input circuit operatively connected to the audio signal switching circuit; and an audio signal output circuit operatively connected to the audio signal switching circuit for outputting a selected audio signal; and an audio signal output circuit operatively connected to the audio signal switching circuit for selectively fading the signal. a signal attenuation device operatively connected to the acoustic signal output circuit for in and fading out; a sensor circuit operatively connected to the priority source input circuit for detecting the signal; and the acoustic signal switching circuit; a signal attenuator and a computer processor operatively connected to the sensor circuit, such that upon detection of an acoustic signal present at the preferred source input, said processor fades out said other signal; energizes a signal attenuator, energizes a signal selection switching circuit to connect the priority input to the audio signal output, and simultaneously switches out the priority input to switch out the other signal. 2. The audio signal selection switching circuit includes two sets of analog switches, each set having a switch for each channel of the audio signal; 3. The apparatus of claim 1, wherein: is operatively connected to said preferred source input circuit, and a second set is operatively connected to said further source input circuit. Claims characterized in that the input circuit includes a high power buffer circuit for the acoustic signal of each channel, each buffer circuit including a DC offset voltage and a high pass filter including a series capacitor for blocking low frequency noise. The apparatus according to item 1. 4. The audio signal output circuit includes an output buffer circuit for each audio signal channel of the selected signal, each buffer includes an operational amplifier, and the input of the amplifier is 5. The apparatus of claim 1, further comprising a high-pass filter connected to the signal attenuator, the output of the amplifier for noise removal and impedance matching. The apparatus includes a digital fader circuit for each channel of the audio signal, the output of each digital fading circuit being one of the operational amplifiers of the audio output circuit.
5. Device according to claim 4, characterized in that it is operatively connected to two inputs. 6. Each digital fading circuit can be activated simultaneously to rapidly attenuate the signal at the input of each output buffer, or can be operated sequentially to fade said signal in or out. A claim characterized in that it includes a plurality of parallel resistances,
The device according to item 1. 7. The sensor circuit includes a mixer-amplifier to form a composite signal of all channels of the priority signal input, and a signal outside the amplitude threshold band to input the series of rectangular waves to the computer processor. 2. The device of claim 1, further comprising a trigger circuit for converting the signal into a wave. 8. The apparatus of claim 7, wherein said mixer amplifier includes means for selectively adjusting gain by said computer processor. 9. The mixer amplifier includes an operational amplifier with a feedback loop through a resistor, and the device for selective gain adjustment includes at least one switch and a resistor in parallel with the resistor of the feedback loop. 9. The apparatus of claim 8, wherein said switch is operable by a computer processor. The trigger circuit includes a Schmidt type trigger;
8. Device according to claim 7, characterized in that it includes a device for adjusting its amplitude threshold band. (2) the Schmitt trigger includes an operational amplifier, the threshold band is established by a feedback loop having a resistor, and the threshold band adjustment device includes at least one switch in parallel with the feedback loop resistor; 11. The apparatus of claim 10, further comprising a resistor, the switch being operable by a processor of the computer.