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FIELD OF THE INVENTION The present invention relates generally to a rotary control knob for
volume control and power on / off of an audio system, and more particularly to the need to
include separate mechanical switches It relates to controlling the on / off state of an audio
system using a rotary encoder without gender. 2. Description of the Related Art A nonelectronically controlled prior art audio system generally adjusts the volume level of the audio
signal to be reproduced and directly controls the main power supply to the audio signal, I used it.
Thereafter, an electronic control system using a microprocessor was introduced to digitally
control the audio reproduction and amplification circuit and the power supply operation.
A digital rotary encoder can be used in conjunction with the microprocessor control system to
provide a volume control knob that functions similarly to previous audio systems. The rotary
encoder provides a pair of output signals in quadrature relation such that the relative phase of
the two quadrature signals specifies the direction of rotation of the rotary encoder. The signal
consists of square wave pulses, such that the number of pulses specifies the rotation angle of the
rotary encoder. The microprocessor uses this information to adjust the output volume level of the
audio system.
In order to incorporate the power on / off function into the rotary encoder, the prior art system
is like a metal contact or conductive elastomer pill-type switch to generate an on / off signal that
can be sent to the microprocessor Sometimes incorporated mechanical switches. The actuation of
this mechanical switch could, for example, be done by pressing the rotary encoder in its axial
direction. The additional mechanical switching elements used have increased the cost of the
rotary encoder. In addition, the incorporation of additional movable contact parts increases the
concern for wear and deterioration and may lead to premature failure of the audio system.
SUMMARY OF THE INVENTION The present invention provides a mechanical on-off power
supply by using a digital rotary encoder with a novel program of microprocessor to emulate an
on-off switch. The purpose is to eliminate the switch. SUMMARY OF THE INVENTION According
to a first aspect, an electronically controlled audio system of the present invention has an on
state and an off state and generates a first pulse signal during clockwise rotation to provide an
anti-clock. It has a rotary encoder that generates a second pulse signal during directional
rotation. A visual display graphically displays volume levels. A controller is responsive to the first
pulse signal and the second pulse signal to adjust the volume level of the audio signal. The
controller goes from the on state to the off state in response to the volume level falling to a
predetermined level and no increase in volume level during a predetermined delay time after
reaching the predetermined volume. The controller goes from the off state to the on state in
response to rotation of the rotary encoder in response to the increase in volume level. Preferably,
the visual display may display an off alert for a predetermined delay period. 【0007】Preferably,
the first and second pulse signals may be composed of a pair of quadrature phase signals having
a relative phase that specifies the rotational direction of the encoder. However, other types of
rotary encoders can also be used in the present invention. DETAILED DESCRIPTION OF THE
PREFERRED EMBODIMENT A digital rotary encoder is available from Bourns, Inc. Etc.) are
available. Such an encoder is also known as an alternating binary switch or digital panel control.
The encoder includes a pair of wiper contacts that generate a 2-channel or 2-bit alternating
binary code signal consisting of a pair of square waves 90 ° apart. The relative phase of the two
signals determines the direction of rotation of the encoder. Thus, during clockwise rotation, the
encoder generates a first pulse signal in which one of the square waves is 90 ° ahead of the
other. During counterclockwise rotation, the encoder generates a second pulse signal in which
the other of the square waves is advanced by 90 °. 【0009】It is known to integrate mechanical
contact switches, such as momentary push button switches, into digital rotary encoders, as
shown in U.S. Pat. Nos. 4,866,219 and 5,438,172. However, the additional mechanism increases
the cost of the rotary encoder and will increase the failure mode of the device. 【0010】The
present invention uses a digital rotary encoder without an integral mechanical on / off switch in
the audio system shown in FIG. The rotary encoder comprises a first switch element 10 and a
second switch element 11. The switch element 10 is connected to the positive power supply
voltage + V via the pull-up resistor 12 and is directly grounded. Likewise, switch element 11 is
also connected to + V via pull-up resistor 13 and is directly grounded. The junction of switch 10
and pull-up resistor 12 is connected to one of the inputs of microprocessor 14 via a debounce
low pass filter 15. Debounce filter 15 includes a series resistor 16 and a parallel capacitor 17.
Similarly, debounce filter 18, including resistor 20 and capacitor 21, connects the junction of
pullup resistor 13 and switch element 11 to another input of microprocessor 14. The
microprocessor 14 decodes the alternating binary code signal applied to its input, identifies the
direction of rotation, and adjusts the audio signal in response to the current state of the audio
system and the received pulse. It is preferable to store the number of pulses prior to performing
the volume level step change, based on the general resolution of commercially available
encoders. For example, microprocessor 14 counts the number of pulses (eg, 4 pulses) in either
direction and then commands a corresponding step change in volume level. 【0011】Thus, in
response to the predetermined number of pulses (where the predetermined number may be one
or more), the microprocessor 14 adjusts the volume of the reproduced audio via control signals
sent to the audio processor 22.
Audio processor 22 may comprise a variable gain amplifier or may be a more sophisticated audio
controller that adjusts tone, balance, fade and other audio parameters under control of
microprocessor 14 . 【0012】As is known in the art, microprocessor controlled audio systems
generally have an on state and an off state. In the on state, the radio control is activated and the
audio signal is played back. In the off state, most parts of the audio system are powered off while
the microprocessor continues to operate under continuous power (that is, in a car system, the
vehicle ignition switch is on, Battery power is applied to the audio system, but the user has
turned off the audio activation). While the off state provides limited functionality, the main
function of the microprocessor in the off state is to detect the power up command and control
the transition to the on state. 【0013】FIG. 2 shows a control panel 25 of an audio system,
including a rotary encoder 26, with the encoder extending through the control panel. The display
panel 27 displays voice parameters and information messages to the user. 【0014】FIG. 3 shows
the display contents of the display 27 with the audio system on and receiving an FM radio
broadcast. The alphanumeric display area 28 displays the frequency of the received FM
broadcast. Display 27 further includes a volume display with fixed scale lines 30 and variable
volume level lines 31. As the volume level rises, more bars are turned on in the volume level line
31 towards the right end of the display 27 gradually. Conversely, when the volume level is
reduced, fewer bars are illuminated, and when the volume level is zero or minimal, no bars are
illuminated. 【0015】The present invention uses a rotary encoder that performs power on / off
operation independently. Thus, when the system is in the on state, the audio system can be
turned off (ie put in the off state) by first lowering the volume to the zero level (or a
predetermined minimum level). Once this level is reached, a warning message is given to the user
that the audio system is being turned off.
Thus, the word "OFF" is displayed on the display 27, as shown in FIG. The warning message is
displayed for a predetermined delay time before entering the off state. So, if the user does not
really want to turn off the audio system, he can raise the volume to prevent the system from
going off. 【0016】The rotary encoder is monitored by the microprocessor while in the off state
and is used to initiate a transition back to the on state. Thus, while in the off state, the transition
to the on state is in response to the volume level exceeding a predetermined intensity (e.g.,
clockwise rotation set to one or more encoder pulses) Is done. By using a predetermined strength
greater than one, accidental small movements of the volume control knob will not lead to the
power on of the audio system. 【0017】The transition from the off state to the on state is shown
in more detail in FIG. The car radio or audio system is off at step 40. At step 41, the
microprocessor, which also operates during the off state, monitors the operation of the encoder.
If the rotary encoder has not sent a time-varying pulse signal, step 41 is repeated. If encoder
actuation is detected, then at step 42 a check is made as to whether the encoder actuation
represents an increase in volume level. If the volume has not been raised, the process returns to
step 41. Otherwise, a power on start sequence is performed at step 43. This sequence is general
and involves muting the output amplifier, followed by powering on the power amplifier, and then
unmuting the amplifier. Thereafter, at step 44, the audio system is on. 【0018】The operation of
the invention while the radio or audio system is on is shown in FIG. The radio is on at step 50
and begins to monitor the operation of the rotary encoder at step 51. If operation of the encoder
is detected, then in step 52 a check is made to determine if the volume is raised (ie, the rotation
is clockwise).
In response to the clockwise rotation, a volume increase sequence is performed at step 53 and
returns to step 51 to monitor the operation of the encoder. Depending on the angular resolution
of the rotary encoder, the volume increase sequence may step the volume level one step per
pulse from the rotary encoder or one step for a predetermined number of pulses from the rotary
encoder You can raise it. 【0019】At step 52, if the rotation is not clockwise, a volume reduction
sequence is performed at step 54. In step 55, a check is made to determine if the volume level
has been reduced to zero (or some other predetermined minimum level). If not, it is returned at
step 51 to monitor further operation of the encoder. If the volume level returns to zero (or some
other predetermined minimum level), a timer is started and a warning message is displayed at
step 56. This timer measures a predetermined delay time for displaying a warning message. The
delay time by the timer can typically be about 1 to 3 seconds. During a predetermined delay
time, the rotary encoder is monitored at step 57 for clockwise rotation. If a clockwise rotation is
detected, then a volume increase sequence is performed at step 53 to avoid powering off the
audio system. If a clockwise encoder activation is detected, a check is periodically made at step
58 to determine if the timer has expired (i.e., counted out). If the timer has not expired, the
process returns to step 57. Once the timer has expired, a power off sequence is performed at
step 59. The power off sequence disconnects power from most components of the radio or audio
system, but at least maintains operation of the microprocessor. Thereafter, the radio or audio
system is maintained in the off state at step 60 (and the method of FIG. 5 is initiated). The
present invention is to emulate an on-off switch. By using a digital rotary encoder together with a
new microprocessor program, the mechanical on / off power switch can be eliminated.
Thus, the audio system simplifies its manufacturing process and reduces the cost of its
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description, jp2000184479
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