JPH0445920B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable to system, component, stereo, etc. source equipment that outputs predetermined audio signals independently of each other, such as a tape deck, tuner, amplifier, player, etc. Select one and
The present invention relates to a source device selection device that derives an audio signal from the selected source device.

[Prior Art and Problems to be Solved by the Invention] In conventional devices of this type, even if the source device is switched, for example, the record player that was operating before that time continues to rotate, and the tape deck is not fed until the end of the tape. was. Therefore, after changing the source device selection section (faction switch), the operation of the record player must be stopped or the tape deck must be paused, which is time-consuming. .

[Means for Solving the Problems] Therefore, the present invention selects one of a plurality of source devices that output a predetermined audio signal, each independent of the other, and derives the audio signal from the selected source device. The source device selection device includes a source device selection section that selects any one of the source devices, and when one of the plurality of source devices is selected by operating the selection section, muting is performed. After the operation of the source device selected before the operation is canceled, the muting is canceled, and then the audio signal from the selected source device is derived. The present invention provides a source device selection device.

[Example] Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows, by a block diaphragm, a system component stereo centralized control device including a source device selection device according to the present invention.
It is composed of a signal selector 3 and a keyboard 8. The central control circuit 1 is a microprocessor such as a microcomputer consisting of a CPU, ROM, RAM, etc., and the operation instruction circuit 2 converts the digital output from the control circuit 1 into, for example, a decimal number, and outputs it to a tape recorder 4, record player, etc. 5. It is an interface between devices and a microprocessor, such as giving operation instructions to a plurality of source devices such as the AM tuner 6 and FM tuner 7, which are independent of each other and output predetermined audio signals.

The signal selector 3 controls the volume and sound quality of the analog signal from each device using the digital output from the control circuit 1, and also selects any one of the devices 5 to 7 and controls the output from the selected device. The audio signal is derived to the amplifier 9. The keyboard 8 is an external selection device for the listener to give operation instructions to each device. The central control circuit 1 and the operation instruction circuit 2 constitute a central processing section 101, and the output from the signal selector 3 is sent to the amplifier 9 and speaker 10 for normal performance.

FIG. 2 shows an example of the arrangement of keys on the keyboard 8, where 201, 202, 203, and 204 are for a tape deck, a record player, and an FM key, respectively.
205 is a recording instruction key, 206 is a pause key, 207, 209 and 210 are device control keys, and 208 is a volume adjustment instruction key.

FIG. 3 is a flowchart showing an outline of the main routine of the control program by the system component stereo centralized control circuit 1 according to the present invention.

FIG. 4 is a flowchart showing a subroutine for FM tuning in the main routine.

FIG. 5 shows an example of a mechanism for controlling a tape recorder by the central processing section 101.
It shows the relationship between the reel motor 505, the pinch roller solenoid 506, and the capstan motor 507 arranged in the bridge circuit constituted by elements 501 to 504 and the central processing section 101.

FIG. 6 shows an example of a mechanism for controlling a record player by the central processing section 101, in which an arm rotation motor 60 is arranged in a bridge circuit composed of elements 601 to 604.
5. Arm elevation plunger 606
It also shows the relationship between the record rotation motor 607 and the central processing section 101.

Figure 7 shows the FM tuner in the central processing section 1.
01, which shows the relationship between the central processing section 101 and the tuning motor 705 located in the bridge circuit constituted by the elements 701 to 704.

Next, the main flow of the functions of the above-described embodiment of the present invention will be explained.

When the power of the system is turned on, the central processing section 101 shown in FIG. 1 is started, and the main routine shown in FIG. 3 is activated (301 in FIG. 3). The main routine is an endless routine that waits for the listener to operate the keyboard 8 by constantly repeating a loop of judgments and commands as described below. First, keyboard 8
It is determined whether any of the selection keys 201 to 204 has been pressed (note 302 in the figure), and if it has not been pressed, the contents of the previous register B are read (303 in the figure), and the process proceeds to judgment 304. If it has been pressed, the process directly advances to determination 304. Note that register A in this main routine refers to registers 201 to 20 on the keyboard 8.
When one or more of the selection keys 20 and 4 are pressed, the central control circuit 1 selects the selection key 20.
This is a register that temporarily stores digital binary output patterns based on on/off values of 1 to 204.

In judgment 304, it is determined whether A=1, and if A=1, after storing A in register B (307 in the figure), the program proceeds to the tape deck playback routine (308 in the figure) and returns to the beginning. If A=1, the process advances to decision 305. In judgment 305, A is 2≦
Determine whether A<4, and if 2≦A<4,
Store it in register B as A=2 (309 in the figure,
310), proceeds to the player playback subroutine (311 in the figure), and returns to the beginning.

If 2≦A<4, proceed to judgment 306, and 4≦A
Determine whether <7, and if 4≦A<7, A=
4 in register B (312, 31 in the figure).
3) Proceed to the FM tuning subroutine (314 in the figure) and return to the beginning. If 4≦A<7, it is stored in register B as A=8 (31 in the figure).
5, 316), proceeds to the AM tuning subroutine (317 in the figure), and returns to the beginning.

The four types of devices are selected as described above, but by increasing the number of selection keys and increasing the judgments shown in 304 to 306, etc., it is possible to easily increase the number of selected devices such as the television 11 shown by the dotted line. .

Judgments 305 and 306 perform priority selection of keys on the software so that when two or more keys are pressed at the same time, the key corresponding to the higher bit is selected preferentially.

Next, the FM tuning subroutine shown in FIG. 4 will be explained.

When the subroutine is selected and started (401 in the figure), it is determined whether FM tuning has been performed before (402 in the figure), and if not, the process is performed before FM tuning was selected by the selection key 203. In this case, another source device other than the FM tuning was selected, so for example, if a tape deck was selected, you could mute the signal system to cut off the output from the speaker, and then change its mechanism (operation). Then, mutating is canceled and the mode is switched to FM, and the process proceeds to judgment 404. Further, if tuning has been performed before the selection key 203 is pressed, the process directly advances to judgment 404.

In judgment 404, when the control key 207 or 210 is pressed, the tuning dial is moved to select a station (405 in the figure);
Decision 404 is made again. If pressed, judge 4
Proceed to 06. In the judgment 406, the volume control key 208
It is determined whether or not is pressed. If it is pressed, the process advances to judgment 407, and if it is not pressed, the process advances to judgment 409. In judgment 407, it is judged whether the control key 207 or 210 is pressed, and if it is not pressed, judgment is made again in 406.
, and if pressed, increases or decreases the volume, and then returns to decision 406. In judgment 409, it is judged whether the recording instruction key 205 has been pressed,
If it is pressed, the process advances to the recording subroutine 410, and if it is not pressed, the process returns to the main routine.

In the above description, the command 405 corresponds to, for example, instructing a channel selection operation on a record in a player, and corresponds to instructing a channel selection operation on a tape in a tape deck. Therefore, subroutines for controlling other devices such as tape decks and players can also be constructed in the same manner as this FM tuning subroutine.
You can also use the control keys 207 and 21 to adjust the volume.
0, the pause key 206, the repeat key 209, and other key operations.Optional routines can also be easily incorporated in the same way.The central control circuit 1 controls the volume and sound quality using the signal selector. This is done by directly controlling the attenuator in 3. In addition, the selection key 201
.about.210 etc. can also be detected using an interrupt routine.

Next, a mechanism for controlling the operation of each device by the main routine and subroutine incorporated in the centralized control circuit of the central processing section 101 will be explained with reference to FIGS. 5 and 6.

In the following explanation, it is assumed that all terminal potentials are controlled by the above-mentioned main routine and subroutine.

In FIG. 5, when a tape deck is designated with the keyboard 8, the terminal 508 of the central processing section becomes high potential, the coil 509 is energized, and the switch 510 is turned on.
The capstan motor 507 rotates by attracting the section. Further, the terminal 511 also becomes high potential, the pinch roller solenoid is pulled, and the tape is pressed against the capstan to start running the tape. When the pause key 206 is pressed, the potential of the terminal 511 decreases, the pinch roller is released from pressure, and the device is in a stopped state.
When fast forwarding or rewinding is specified using the keyboard 8, the terminal 513 or 514 becomes a high potential, and the current flows from the element 501 to the reel motor 505 to the element 504, or from the element 503 to the reel motor 505. The reel motor 505 rotates forward or backward to fast-forward or rewind the tape.

In this embodiment, rewinding is performed while the control key 207 is pressed, and fast forwarding is performed while the control key 210 is pressed.
Although it is assumed that the control keys 207 and 210 can be latched when they are released, it is of course also possible to provide a stop key, a performance key, etc., to release the latches of the controls 207 and 210. Various other applications are conceivable, such as stopping at a no-signal portion between songs, or exceeding the no-signal portion between songs by the number of times the control keys 207 and 210 are pressed.

In FIG. 6, when the record player is designated on the keyboard 8, the terminal 608 becomes a high potential, the coil 609 is energized, attracting the switch 610, the terminal 611 becomes a high potential, and the switch 6
10. The record rotation motor 607 rotates via the element 612, and the turntable rotates. Next, the terminal 613 becomes a high potential, and the element 616
is energized, operating the arm elevation plunger 606 to lift the arm from the armrest, then the terminal 615 becomes high potential, and current flows through the arm rotation motor 605 from elements 601 to 6.
04, the arm moves forward, and when it reaches the beginning of the first song, the potential at the terminal 615 drops, the arm stops rotating, and the arm lowers to start playing the record. When the pause key 206 is pressed, the terminal 603 becomes high potential again and enters a pause state. When the control key 207 or 210 is pressed, the terminal 613 first becomes high potential, and after lifting the arm, the terminal 614 or 615
is set to a high potential, the arm rotation motor 605 is rotated in reverse or forward direction, the arm is moved backward or forward, the inter-track portion is detected, the rotation is stopped, and the arm is lowered to enter the record playing state.

In the present invention, the control key 207,
Alternatively, the above-mentioned arm is rotated as long as key 210 is pressed, but it is also possible to skip songs by the number of times keys 207 or 210 are pressed, using the software in the central control circuit 1, and this can be done separately. A display button may be provided in the channel, and this may be associated with a designated song, and the channel may be selected by selecting and instructing the button.

A tuner 700 in FIG. 7 is an auto-search tuner configured to automatically receive radio waves from broadcasting stations in an optimal state. When the tuner 700 is specified on the keyboard 8, the terminal 710 of the central processing section becomes high potential, and the coil 706 is energized, attracting the switch 707 and enters the tuning state.When the control key 210 or 207 is pressed, the terminal 708 Alternatively, 710 becomes a high potential, the tuning motor 705 is rotated forward or reverse, the tuning frequency is increased or decreased, and when the tuning is achieved, the terminals 708, 7
The motor 705 is stopped by setting both 10 to a high potential or a low potential.

In this embodiment, a frequency synthesizer type tuning method is adopted, and the up counter is operated while the control key 210 is pressed, and the down counter is operated when the control key 207 is pressed. However, as with the tape recorder and record player described above, a preset system is also possible in which the tuning changes by skipping the next song as many times as the control key 207 or 210 is touched, and of course a variable capacitor can be used. Variable to change the tuning frequency,
A method of tuning to a broadcasting station on a different frequency is also possible.

It is convenient to configure the above preset tuning method and the normal tuning method so that both can be used in parallel, and the display can be made to correspond to the preset station and displayed in the same way as in the case of the record player described above. A button may be provided and channel selection may be performed by selecting the button.

[Effect] As described above, when the source device selection unit selects one source device from a plurality of independent source devices, the present invention cancels the operation of the source device that was selected before the selection. For example, by simply switching the source device, the record player, tape deck, etc. that are in operation are released before switching, eliminating the need to manually cut the record player or press the stop lever on the tape deck. This has the effect of simplifying the handling of a playback/recording device including a plurality of source devices, such as a stereo, each of which outputs a predetermined audio signal independently of each other.

Furthermore, since the operation of the source device before switching is canceled, unnecessary signals are prevented from reaching the signal system or the selected source device, and there is an effect that malfunction of the device and signal deterioration can be prevented.

Furthermore, when selecting a new source device, muting is first applied, and after the operation of the previously selected source device is canceled, muting is canceled and the audio signal from the selected source device is derived. Therefore, it is possible to prevent the generation of noise at the time of selection, and it is also possible to prevent interference between the audio signal from the source device selected before the operation and the audio signal from the source device selected above. source equipment can be selected reliably.

[Brief explanation of drawings]

FIG. 1 is an explanatory block diagram of a centralized control device including a source device selection device according to the present invention, FIG. 2 is an explanatory diagram of a keyboard that is an external selection device, and FIG. 3 is an illustration of a centralized control device according to the present invention. Flowchart of the main routine of the embodiment, No. 4
The figure is a flowchart of the FM tuning subroutine of the main routine, Figure 5 is an explanatory diagram of the control mechanism of a tape recorder, and Figure 6 is an explanatory diagram of the control mechanism of a record player.
FIG. 7 is an explanatory diagram of the control mechanism of the tuner. 1... Central control device, 2... Operation instruction circuit, 3
...signal selector, 4...tape recorder,
5... Record player, 6... FM tuner, 7... AM tuner, 8... Keyboard,
9...Amplifier, 10...Speaker, 11...TV, 101...Central processing section, 201...Tape recorder selection key, 202...Record player selection key, 203...FM tuner selection key, 204...AM Tuner selection key, 20
5... Recording instruction key, 206... Pause key, 2
07...Control key, 208...Volume adjustment key, 209...Repeat key, 210...Control key The following sentences are included in each frame in FIG. 301... Power on. start. 302...Whether any selection key was pressed? 303... Read previous register B and enter register A. 304
...A=1? 305...2≦A<4? 306
...4≦A<7? 307...A to register B
Put it in. 308...Go to tape recorder playback routine. 309...A=2. 310...A
Put into register B. 311...Go to record player subroutine. 312...A=4.
313...Put A into register B. 314...
...Go to the FM tuning subroutine. 315...
...A=8.316...Put A into register B. 317...Go to AM tuning subroutine. Each frame in Figure 4 contains the following sentences. 401...FM tuning starts. 402
...Is it FM tuning before? 403...Muteing and canceling the mechanism in front and putting it in FM tuning state. 404...Is the control key pressed? 405...Move the tuning dial. 406...Is the volume adjustment key pressed? 407...Is the control key pressed? 408...Perform volume adjustment. 409...
…Is the recording instruction key pressed? 410...Go to recording subroutine. 505...Reel motor, 506...Pinch roller solenoid. 5
07...capstan motor, 605...arm rotation motor, 606...arm elevation plunger, 607...record rotation motor, 705...tuning motor.

Claims (1)

[Scope of Claims] 1. A source device selection device that selects any one of a plurality of source devices that are independent of each other and output a predetermined audio signal, and derives an audio signal from the selected source device. comprising a source device selection section for selecting any one of the source devices, and when one of the plurality of source devices is selected by operation of the selection section, muting is applied; A source device selection device characterized in that after the operation of the previously selected source device is canceled, muting is canceled, and then an audio signal from the selected source device is derived. .