JPH02116074A - Audio equipment - Google Patents

Abstract

PURPOSE:To switch the stop state to the reproduction state of a compact disk player in a short period by providing a control circuit which holds the stored characteristic data in a memory during the application of a tuner. CONSTITUTION:At working of a tuner, a system controller 12 of a compact disk CD player outputs a stand-by signal to a servo processor 13. The processor 13 stores the received data on the transmission characteristics of a servo system into an internal memory 15 and sets the memory in a stand-by state by the stand-by signal. Thus, when the tuner is switched to the CD player and the controller 12 stops the output of the stand-by signal, as the transmission characteristics of the servo circuit are already stored in the memory 15, the stop state of an optical disk player can be switched to the reproduction state in a short period.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to an audio device in which a tuner for receiving radio broadcasts and the like and an optical disk player used for playing music etc. are integrated or combined.

"Prior Art" FIG. 2 is a block diagram showing an example of the configuration of a conventional vehicle-mounted compact disc player (hereinafter simply referred to as a CD player). In this figure, l is a compact disc (
CD), 2 is a spindle motor that rotationally drives the CDI,
3 is an optical pickup that uses a laser beam to read digital information recorded by pits on the signal recording surface of the CDI; 4 is a feed motor that moves this optical pickup 3;

Further, 5 is an RF amplifier that generates and outputs a focus error signal and a tracking error signal from the read signal output from the optical pickup 3, and also amplifies and outputs this read signal, and 6 is an RF amplifier that outputs the signal. A data processor performs processing such as signal demodulation, code error correction, and correction; 7 is a crystal oscillator used to oscillate a system clock in the data processor 6; 8 is a crystal oscillator used to store data processed in the data processor 6; 5-RAM.

Furthermore, 9 is a DA converter that converts the digital signal output from the data processor 6 into an analog audio signal, and 10 is an audio circuit that performs processing such as amplification and sound quality control on this audio signal. The output signal is output to an external speaker or the like via the audio output terminal 11. 12 is a system controller, which includes a CPU (central processing unit) and an RO in which programs used in this CPU are stored.
It consists of M and l10 (input/output) ports. 13, under the control of the system controller 12, the RF
Focus adjustment control (focus servo) and tracking adjustment control (tracking servo) of the optical pickup 3 and feed adjustment control (feed servo) of the feed motor 4 are performed using the focus error signal, tracking error signal, etc. output from the amplifier 5. These are servo processors that perform constant linear speed control (spindle servo) of the spindle motor 2. Further, in the servo processor 13, 14 is a digital equalizer used to correct the transfer characteristics of the four servo systems described above, and 15 is a digital equalizer used to correct the transfer characteristics of the four servo systems described above, and data on the transfer characteristics of the four servo systems described above is transmitted from the system controller 12 and stored 5-RAM.

In addition, 16 is a power supply circuit that supplies power to each part of this CD player.

In such a configuration, when this CD player is installed in a car together with a tuner, a cassette deck, etc., the system clock is kept oscillating in the data processor 6 in this CD player while the passenger is using the tuner. This system clock interferes with tuner reception. Therefore, while the passenger is using the tuner, a control signal is transmitted from the system controller 12 in this CD player to the power supply circuit 16,
By turning off all the power to this CD player, the oscillation of the system clock oscillating in the data processor 6 was stopped.

``Problems to be Solved by the Invention'' By the way, in the conventional CD player mentioned above, the system clock oscillation stops while the tuner is operating, so there is no reception interference to the tuner, but the overall system of the CD player Since the power is turned off, the characteristic data of the four servo systems stored in the SRAM 15 in the servo processor 13, namely, the low frequency boost and high frequency phase compensation of the focus servo, and the low frequency boost and high frequency phase of the tracking servo. There was a drawback that data such as compensation, spindle servo, and feed servo filter characteristics were lost.

Therefore, when a passenger switches from a tuner to a CD player, the CDI is played after transmitting the characteristic data of the four servo systems from the system controller 12 to the 5-RAM 15 in the servo processor 13, so no audio is output. The problem was that it took a long time to complete the process.

This invention was made in view of the above-mentioned circumstances, and
It is an object of the present invention to provide an optical disc player that can shift the player from a stopped state to a playing state in a short time.

"Means for Solving the Problems" The present invention provides an audio device that includes an optical disc player having a memory in which characteristic data of a servo circuit is stored and a tuner, and that uses the tuner by switching between each of these electronic devices. The device is characterized in that it includes a control circuit that causes the memory to hold the characteristic data stored in the memory during use.

"Operation" According to the present invention, when an operator switches from a tuner to an optical disc player, an optical disc can be immediately played back.

"Embodiment" Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a CD player used in audio equipment according to an embodiment of the present invention. In this figure, parts corresponding to those in FIG. The explanation will be omitted. The difference between the CD player shown in this figure and the one in FIG. 2 is that instead of the control signal being output from the system controller 12 to the power supply circuit 16,
A standby signal is output from the power supply circuit 16 to the servo processor 13. This standby signal is output from the system controller 12 to the power supply circuit 16 and the servo processor 13 when the tuner is operating and when the ignition switch of the automobile is turned off.
Turn off the power to circuits other than 2. On the other hand, the servo processor 13 receives the standby signal from the internal 5-RA.
Switch M15 to the standby state and switch the current consumption to the minimum state.

In order to use this CD player with such a configuration, first, the power lines of each of these devices are connected to the battery wire of the automobile, together with the tuner, etc., and each of these devices is attached to a dash board or the like. As a result, C
The system controller 12 in the D player transmits data on the transfer characteristics of the four servo systems to the servo processor 13, and then outputs a standby signal to the power supply circuit 16 and the servo processor 13. And servo processor 1
3 is the data of the transmitted servo system transmission characteristics to the internal 5
- After storing in RAM15, 5
- Put the RAM 15 into a standby state and minimize the current consumption consumed internally.

Next, assume that the passenger operates the tuner. In this state, the CD player is still in standby mode and the system clock is not oscillating, so reception by the tuner is not disturbed.

Assume that the passenger switches from the tuner to the CD player. As a result, the system controller 12 in the CD player stops outputting the standby signal and turns on the power supply circuit 16 to supply power to all circuits. In addition, 5-RA in the servo processor 13
The transfer characteristics of the servo circuit are already stored in M15. Therefore, the CDI is immediately played back and the audio is output from the speaker.

In this way, there is no need to transmit the transfer characteristics of the servo circuit from the system controller 12 to the 5-RAM+5 in the servo processor 13 every time the operator switches from the tuner to the CD player, so the CD player can be started immediately, and the system The burden on the controller 12 can be reduced.

The embodiment described above is a CD player for normal music playback, but the present invention also applies to CD-ROM, CD-■ (
The invention can also be applied to playback devices such as Compact Disc Video) and CD-1 (Compact Disc Interacitive Media).

Furthermore, the present invention is applicable not only to optical disc players but also to other audio equipment that oscillates a system clock and adversely affects the tuner.

Note that the audio equipment mentioned above is an example of being installed in a car.
This audio equipment may be a stationary type system component stereo or a portable type cassette recorder with a radio.

In addition, in the embodiment described above, the system clock in the CD player is stopped and the standby signal output is controlled by the CD player.
Although the system controller 12 within the player performs this operation, an independent control device may also perform this operation.

[Effects of the Invention] As explained above, according to the present invention, there is an effect that the optical disc player can be shifted from the stopped state to the playing state in a short time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an in-vehicle compact disc player used in audio equipment according to an embodiment of the present invention, and FIG. 2 is a block diagram showing an example of the configuration of a conventional in-vehicle compact disc player.

Claims (1)

[Claims] In an audio device that is equipped with an optical disc player having a memory in which characteristic data of a servo circuit is stored and a tuner, and is used by switching between these electronic devices, when the tuner is used, the characteristic data stored in the memory is stored. An audio device comprising a control circuit that is held in the memory.