JPH0749867Y2 - Input switching device display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a display device for displaying a switching status of an input switching device for selecting an audio signal to be input, and in particular, a single audio signal is converted into a digital signal and an analog signal. The present invention relates to a display device of an input switching device that switches an audio signal from a digital audio device that can output a signal.

(B) Conventional technology Recently, many digital audio devices such as CD players, DAT (digital audio tape recorders), and BS tuners (satellite broadcast receiving tuners) that handle audio signals as digital signals are Is output as an analog signal as well as a digital signal. Therefore, as an audio amplifier, an audio amplifier compatible with a digital signal that can directly input a digital signal from the digital audio device has been commercialized. Such an audio amplifier is the same digital audio device. Even an audio signal from the device can select a desired output from digital signals and analog signals.

Further, the audio amplifier is configured so that audio signals obtained from various audio devices connected to the audio amplifier can be input, as shown in, for example, Japanese Utility Model Laid-Open No. 59-71495. And an input switching device for selecting an audio signal to be supplied to the speaker so that the speaker can be driven according to the audio signal.

Therefore, the input switching device of the audio amplifier corresponding to the digital signal can select the audio device that supplies the input audio signal, and if the selected audio device is the digital audio device, the digital signal and the analog signal can be arbitrarily selected. It is designed to be selectable.

By the way, as an input switching device for a digital signal type audio amplifier, an operation knob is usually provided on an operation panel for selecting an audio device which supplies an analog audio signal including an analog signal in a digital audio device. In addition, an operation knob for selecting an audio device that supplies an audio signal of a digital signal in a digital audio device is added to the operation panel, and a desired audio signal is input by operating these operation knobs. I was like.

(C) Problems to be Solved by the Invention However, in the above-described manner, the number of operation knobs is increased, and even if there is a difference between a digital signal and an analog signal, there are two audio signals from the same audio device. The operation was complicated because it was selected by operating different operation knobs. Therefore, the digital signal and the analog signal in the digital audio device should be switched so that the audio signal of the same digital audio device can be input as a digital signal or an analog signal by a single operation knob for input switching. Can be considered. In this case, it is necessary to perform a display for informing which output is currently selected among the digital signal and the analog signal. In order to perform such a display, a display device such as a light emitting diode or a fluorescent display tube may be used, but there is a concern that it may be difficult to recognize depending on the display method.

The present invention is intended to provide a display device of an input switching device made in view of the above points.

(D) Means for Solving the Problems The present invention provides a digital display unit for displaying that an audio signal of a digital signal is input to an operation knob operated when selecting an audio signal from a digital audio device. An analog display unit is provided for displaying that an audio signal of an analog signal has been input.

(E) Function The present invention is a digital display for displaying that a digital signal and an analog signal are respectively input to the operation knob corresponding to the digital audio device among the operation knobs for performing the switching operation of the input switching device. Section and analog display make it easy to check the operated knob and whether the input audio signal is digital signal or analog signal. It is a thing.

(F) Embodiment FIG. 1 is a circuit diagram showing an input switching device according to the present invention.
(1) is a first digital input terminal to which an audio signal of a digital signal reproduced by a CD player is supplied, and (2) can output the audio signal as a digital signal,
A second digital input terminal provided as a spare terminal for supplying a digital signal of a digital audio device that cannot be connected to a predetermined connection point, (3) is the first and second digital input terminals (1) and (2 The first selector for selecting the audio signal supplied to the), (4) is connected to a digital recording system circuit (not shown) of the DAT for recording the audio signal as a digital signal,
The digital output terminal to which the audio signal selected by the first selector (3) is supplied, (5) is the third digital input terminal (6) to which the audio signal of the digital signal reproduced by the DAT is supplied, First selector (3)
And a second selector for selecting an audio signal supplied to the third digital input terminal (5), and (7) for demodulating and processing various digital signals selected by the second selector (6). An input circuit for performing matching with the next-stage circuit, (8) a DA converter for converting a digital signal obtained from the input circuit (7) into an analog signal,
(9) is a first analog input terminal to which an audio signal of an analog signal received by the tuner is supplied, (10) is reproduced by a CD player which supplies an audio signal of a digital signal to the first digital input terminal (1) The second analog input terminal to which the audio signal of the analog signal is supplied, and (11) is the third terminal provided as a spare terminal for supplying the audio signal of the analog signal of the audio device that cannot be connected to the predetermined connection point. Analog input terminal, (12)
Is a fourth analog input terminal to which an audio signal of an analog signal reproduced by DAT which supplies an audio signal of a digital signal to the third digital input terminal (5) is supplied,
(13) is a speaker (not shown) from among the audio signals output from the DA converter (8) and the audio signals supplied to the first to fourth analog input terminals (9) to (12) A third selector for selecting an audio signal to be emitted, (14) selecting an audio signal supplied to the DA converter (8) and the first to third analog input terminals (9) to (11) The fourth selector (15) for performing the operation is connected to the analog recording system circuit (not shown) of the DAT for recording an analog audio signal, and the fourth selector (1
The analog output terminal to which the audio signal selected in 4) is supplied via the switch (16).

In the circuit of FIG. 1, first and second selectors (3)
And (6) are switched, the digital signal supplied to the first digital input terminal (1), the second digital input terminal (2) or the third digital input terminal (5) is input to the input circuit (7). . Here, the digital signal input to the input circuit (7) is demodulated and processed by the input circuit (7) and input to the DA converter (8). Therefore, from the DA converter (8), the first, second and third digital input terminals (1), (2) and (5)
An audio signal obtained by converting a digital signal supplied to any of the above into an analog signal is output.

The audio signal output from the DA converter (8) is supplied to the third selector (13). The third selector (13) is supplied with audio signals from the first to fourth analog input terminals (9) to (12) in addition to the audio signal from the DA converter (8), respectively. Since the audio signal to be emitted from the speaker can be selected by the selector (13), the audio signal from the DA converter (8) and the first to fourth analog input terminals (9) can be selected by switching the third selector (13). The sound corresponding to the desired audio signal can be emitted from the speaker among the audio signals from (12) to (12).

Therefore, a CD player input by a digital signal, a digital audio device connected to the second digital input terminal (2) and an audio signal from the DAT, and a tuner input by an analog signal, a CD player, a third analog input terminal The sound to be emitted by the speaker can be freely selected from the audio device connected to (11) and the audio signal from the DAT.

On the other hand, the audio signal output from the DA converter (8) is supplied to the fourth selector (14). The fourth selector (14) is supplied with audio signals from the first to third analog input terminals (9) to (11) in addition to the audio signal from the DA converter (8). Further, the audio signal selected by the fourth selector (14) passes through the switch (16) and the analog input terminal (1) when the switch (16) is closed.
5) supplied to. Therefore, when the switch (16) is closed, the audio signal from the DA converter (8) and the first to third analog input terminals (9) to (11) are switched by switching the fourth selector (14). A desired audio signal can be recorded as an analog signal from the audio signal from the DAT by the DAT. However, the audio signal from the DA converter (8) is selected by the fourth selector (14) and is supplied to the third digital input terminal (5) by the second selector (6).
When the audio signal from the DAT is selected, the switch (16) is opened so that the audio signal from the DAT is not input to the DAT.

Therefore, an audio signal from the digital audio device connected to the CD player and the second digital input terminal (2) which is input as a digital signal and converted into an analog signal by the DA converter (8) and an analog signal are input. An audio signal to be recorded as an analog signal by the DAT can be freely selected from among the audio signal from the tuner, the CD player, and the audio device connected to the third analog input terminal (11).

It should be noted that an audio signal of a digital signal from a CD player or a digital audio device connected to the second digital input terminal (2) is not converted into an analog signal and is output to the digital output terminal (4) via the first selector (3). ), The audio signal from the CD player and the digital audio device can be recorded as a digital signal by the DAT. However, at the moment,
It is prohibited to record the audio signal from the CD player as a digital signal, and the DAT digital recording circuit is not compatible with the digital signal from the CD player. It cannot be recorded as it is.

By the way, the first selector (3), the second selector (6), the third selector (13), and the fourth selector (14)
As shown in FIG. 2, the switch (16) and the switch (16) are switched and controlled by a control circuit (18) which operates according to the operating state of the key switch (17). The key switch (1
7) can be switched by pressing operation knobs (22) to (26) (shown in FIG. 3) provided on the operation panel (21) so as to be displaceable in the front-rear direction. .
Therefore, the first selector (3), the second selector (6), the third selector (13), and the fourth selector are operated by pressing the desired operation knobs of the operation knobs (22) to (26). (14) and the switch (16) are switched so that a sound corresponding to a desired audio signal can be emitted from a speaker and a desired audio signal can be recorded by a DAT.

It should be noted that the method for controlling the switching of the first selector (3), the second selector (6), the third selector (13), the fourth selector (14) and the switch (16) is not the gist of the present invention, so detailed description will be given. The description is omitted.

On the other hand, when the key switch (17) is operated, control for switching and controlling the first selector (3), the second selector (6), the third selector (13), the fourth selector (14) and the switch (16) A fluorescent display tube (FL tube) is generated according to the operation state of the key switch (17) while a signal is generated.
FL tube display (19) and light emitting diode (LE
The LED indicator (20) constituted by D) is driven, and the FL tube indicator (19) and the LED indicator (20) indicate various operating states of the audio amplifier.

By the way, a part of the LED indicator (20) is, as shown in FIG. 3, an operation knob (22) for operating the key switch (17).
Through (26). The operation knobs (22) to (26) include operation knobs (22) for selecting a digital audio device, which are operated when selecting an audio signal output from a digital audio device that handles an audio signal as a digital signal. (24) to (24) and operating knobs (25) and (26) for selecting an analog audio device, which are operated when selecting an audio signal output from an analog audio device that handles the audio signal as an analog signal. The operation knobs (22) to (24) for selecting the digital audio device and the operation knobs (25) and (26) for selecting the analog audio device are arranged in a horizontal row to select the digital audio device. Operation knob for (2
Digital display units (27) to (29) for indicating that the audio signals supplied as digital signals are input to 2) to (24), respectively, as shown in FIG. Is formed on the upper left side of the. On the other hand, operation knobs (22) and (24) for selecting a digital audio device having an audio signal output of an analog signal and operation knobs (25) and (26) for selecting the analog audio device.
The analog display section (3 that indicates that the audio signals supplied as analog signals are being input to each
As shown in FIG. 3, 0), (31), (32) and (33) are formed on the upper right side of the same area of each operation surface.

The digital display sections (27) to (29) are illuminated by green LEDs so as to light up in green, and the analog display sections (30) to (33) are illuminated by red LEDs, respectively. By doing so, it is made to light up in red. Then, the digital display (2
7) to (29) and the analog display parts (30) to (33)
Is controlled by the control circuit (18) and displayed as in the flow chart shown in FIG. That is, if the third selector (13) is brought into a state in which an audio signal other than the output from the DA converter (8) is selected by the pressing operation of the operating knob, the third selector (13) can be selected in accordance with the selected state of the third selector (13). The red LED indicating the analog signal lights up. As a result, the analog display portion formed on the operation knob that has been pressed is lit in red. On the other hand, when the audio signal output from the DA converter (8) is selected by the third selector (13) by pressing the predetermined operation knob, the green LED indicating the digital signal is turned on. become. Then, the green LED to be lit is determined according to the selection state of the second selector (6) and the selection state of the first selector (3). That is, if the second selector (6) is in the state of selecting the output from the DAT,
In response to this, the green LED lights up, which causes the digital display section formed on the operation knob for selecting the DAT to light up green. Also, the second selector (6) is the first
If the output from the selector (3) is selected,
Green LED according to the selection status of the first selector (3)
Lights up, which causes the digital display portion formed on the operation knob that has been pressed to light up in green.

Therefore, the audio signal from the digital audio device, which is supplied as a digital signal by the operation of the operation knob for selecting the digital audio device and converted into the analog signal by the DA converter (8), is output from the third selector (13).
When the speaker is driven according to the audio signal, the digital display portion formed on the operated operation knob is lit in green. On the other hand, when the operation knobs other than the operation knob (23) are operated, the audio signal of the analog signal supplied from the audio device is selected by the third selector (13), and the speaker is selected according to the audio signal. When driven, the analog display portion formed on the operated operation knob is lit in red.

By the way, operation knobs (22) and (24) for selecting a digital audio device having an audio signal output of an analog signal in addition to having an audio signal output of a digital signal
The same operation knob is provided by alternately switching the input between the digital signal and the analog signal each time it is operated, or by switching a separately provided switch for switching the input between the digital signal and the analog signal. By operating, the audio signal of the digital signal and the analog signal from the same digital audio device can be selected.

(G) Effect of the Invention As described above, the present invention is a digital audio device selecting operation knob which is also used for selecting two kinds of audio signals, a digital signal and an analog signal, from the same digital audio device. Since a digital display unit and an analog display unit are provided in each, the same digital audio device displays and is displayed on the operation surface of the same operation knob without distinction between digital signals and analog signals. This has the advantage that it is easy to recognize the selected state of the digital audio device corresponding to the audio signal.

Also, the present invention provides a digital display unit at a first position on a predetermined area of the operating surface of the operating knob, and an analog display unit at a second position of a predetermined area different from the first position on the operating surface of the operating knob. Since the digital display unit and the analog display unit are arranged at the unified positions in each of the arranged and arranged operation knobs, it is possible to clearly distinguish between the digital signal and the analog signal in the selected audio signal. Have.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an input switching device according to the present invention, FIG. 2 is a circuit diagram showing a control section for controlling the circuit of FIG. 1, and FIG. 3 shows an embodiment of the present invention. FIG. 4 is a front view showing the child, and FIG. 4 is a flowchart of a program for controlling lighting of the digital display unit and the analog display unit. (3) (6) (13) (14) …… Selector, (1)
(2) (5) …… Digital input terminals, (9) (10) (1
1) (12) …… Analog input terminal, (22) (23) (24)
(25) (26) …… Operation knob, (27) (28) (29) …… Digital display, (30) (31) (32) (33) …… Analog display.

Claims (1)

[Scope of utility model registration request] 1. An input switching device for selecting an audio signal to be input by switching between an audio signal from an analog audio device handling an audio signal as an analog signal and an audio signal from a digital audio device handling an audio signal as a digital signal. , A digital audio device selection that is operated when selecting an audio signal from the digital audio device and is also used to select two types of audio signals, a digital signal and an analog signal, from the same digital audio device Operating knob and an operating knob for selecting an analog audio device which is arranged together with the operating knob for selecting the digital audio device and which is operated when selecting an audio signal from the analog audio device, and a digital signal Audi In addition to displaying that a signal has been input, a digital display unit provided at a first position in a predetermined area of the operation surface of the digital audio device selecting operation knob, and that an analog audio signal has been input are displayed. And an analog display unit provided at a second position in a predetermined area different from the first position on the operation surface of the operation knob for selecting the digital audio device and the operation surface of the operation knob for selecting the analog audio device. A display device for an input switching device, comprising: