JPS63138399A - Reproducer - 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 Field of Industrial Application The present invention relates to a reproduction device in the audio field and the video field including audio.

Conventional technology A conventional playback device will be explained below with reference to the drawings.

FIG. 3 shows a conventional playback device, and this example includes a recording and playback device 2, a playback speed control circuit 3 that controls the playback speed of the recording and playback device 2, and a playback speed control circuit 3 that converts the frequency of an output signal with respect to an input signal. The pitch conversion circuit 4 includes a pitch conversion circuit 4 which controls the pitch conversion ratio of the pitch conversion circuit 4, a pitch conversion control circuit 6 which controls the pitch conversion ratio of the pitch conversion circuit 4, and an input terminal 1 and an output terminal 6. The operation will be explained below.

The signal S1 input to the input terminal 1 is recorded by the recording and reproducing device 2, and outputted as an output signal S2 during reproduction. Normally, the recording/playback device 2 saves the input signal and plays it at another time, so the frequency F (Sl
) and the frequency F(32) of the output signal S2 satisfy the first equation.

F(Sl)=F(S2) ・・・・・・・・・・・・
(1) However, if you want to change the playback speed of the recording and playback device 2 using the output signal C1 of the playback speed control circuit 3, that is, if you want to change the playback speed of the recording and playback device 2, When you want to listen to music, or when you want to listen quickly because you don't have time, the frequencies of the input signal S1 and output signal S2 are determined by the second formula, and especially when the playback speed is increased, the frequency is determined by the third formula. When the playback speed is slowed down, the relationship satisfies the fourth equation.

F(Sl) lol F(S2)・・・・・・・・・・・・・・・
・・・・・・・・・・・・(2))F(31)(F
(32)・・・・・・・・・・・・・・・・・・
・・・・・・(3)F(Sl))F(32)・・・・・・
・・・・・・・・・・・・・・・・・・・・・・・・(4)
In the case of each of the conditions of the second, third, and fourth expressions, there were drawbacks such as changes in pitch, poor resolving power of the content, and different impressions of the music. Therefore, a pitch conversion circuit 4 controlled by the output signal C2 of the pitch conversion control circuit 5 is provided. This pitch conversion circuit 4 converts the input signal S
The frequency F(32) of output signal S3 is the frequency F(32) of output signal S3.
s) and output to the output terminal 6.

With this pitch conversion circuit 4, the input and output frequencies have a relationship that satisfies Equation 6 when lowering the pitch and satisfying Equation 6 when increasing the pitch.

F(S2)>F(S3) ・・・・・・・・・・・・
・・・・・・・・・・・・・・・(6) F(S2)<F
(S3)・・・・・・・・・・・・・・・・・・
(6) Problems to be Solved by the Invention However, the conventional playback device shown in FIG. There were problems such as the inability to meaningfully control the relationship between speed change and pitch conversion.

Below, we will give an example of significant control in the relationship between playback speed change and pitch conversion.

Nishi: Changes the playback speed at the same pitch as it was recorded under certain conditions.

CB) Change the pitch at the playback speed during recording and under certain conditions.

(q Change the pitch under a certain playback speed that is different from the recording speed.

q Change the playback speed under certain pitch conditions that are different from the recorded pitch.

In view of the above problems, the present invention provides a playback device that can significantly control playback speed changes and pitch conversions.

Means for Solving the Problems In order to solve the above problems, the present invention provides a playback device that can control the playback speed, a pitch conversion circuit that converts the pitch of the output signal of the playback device, and a playback speed of the playback device. control,
and a reproduction speed pitch conversion control circuit that controls the pitch of the pitch conversion circuit.

Function The present invention uses the ratio V1 of the playback speed to the recording speed of the recording and playback device, the pitch conversion ratio P1 of the pitch conversion circuit, and the playback speed pitch conversion control circuit, so that the ratios V and P are not completely independent and unrelated; By controlling with a certain relationship, it is possible to produce new effects that were not possible with conventional methods.

Embodiment FIG. 1 shows a block diagram of a reproducing apparatus according to an embodiment of the present invention.

In FIG. 1, the signal S1 input to the input terminal 1 is
The signal is recorded by a recording/playback device 2 having a playback function and a recording function, and is outputted as an output signal S2 during playback. The playback speed of the recording/playback device 2 is controlled by the first output signal C3 of the playback speed pitch conversion control circuit 7. The output signal S2 of the recording/playback device 2 is pitch-converted by the pitch conversion circuit 4, and the output signal S3 is output to the output terminal 6. 2. Controlled by output signal C4.

Now, due to the first output C3 of the playback speed pitch conversion control circuit, the playback speed changes by a ratio V compared to the recording speed, so that the pitch changes by the pitch conversion ratio P1. In this case, the input signal S1 and the output signal S2 of the recording/playback device 2
, each frequency F(S
l), F(32).

Assuming F(33), each frequency has a relationship that satisfies the seventh equation.

On the other hand, the second output C4 of the reproduction speed pitch conversion control circuit 7 changes the pitch conversion ratio P2 of the pitch conversion circuit 4, and each frequency satisfies the eighth equation.

Therefore, the frequency F(
83) satisfies Equation 9.

F(83)=F(31)・Pl・P2 ・・・・−・・
(9) Now, using this equation (9), examples of significant control of the four items described above will be explained.

First, the control method (8) of "changing the playback speed according to the recording pitch and under certain conditions" will be explained.

Substituting into equation 1) satisfies equation 10.

P ・P = 1 ・・・・・・・・・・・・・・・
(1o) That is, for the pitch conversion ratio P1 caused by a change in the playback speed of the recording/playback device 2,
It can be seen that if the pitch conversion ratio P2 by the pitch conversion circuit 4 is set in an inversely proportional relationship, the reproduction speed can be changed under the condition that the pitch is constant.

Next, we will explain the control method of "changing the playback speed during recording and the pitch under certain conditions".

F(32) The condition that the playback speed is constant is that the pitch of the pitch conversion circuit 4 is equal to the pitch of the pitch conversion circuit 4. It can be seen that the conversion ratio P2 directly becomes the pitch conversion ratio of the output signal S3 with respect to the input signal S1.

Next, the control method of (q) for ``changing the pitch under a constant condition of a certain playback speed that is different from the recording speed'' will be explained.

Under the condition that the playback speed is constant, which is different from the recording speed, and Pl is a value other than 1, the value becomes constant.

Substituting this P1=K into equation (9), we get equation (12).
F(83)=F(81)・K-P2 that satisfies the formula...
...(12) Here, if we transform equation (12), we get
Equation (13) is obtained.

That is, the pitch can be changed by the pitch conversion ratio P2 of the pitch conversion circuit 4, but the pitch conversion is also related to the pitch conversion ratio under a certain constant playback speed condition different from the recording speed. Then, at a certain playback speed, the frequency F (83) of the output signal S3 and the input signal S1
In order to equalize the frequencies F(Sl) of , it is sufficient to satisfy equation (14).

xep==1 ・・・・・・・・・・・・・・・
(14) Finally, the control method p) of "changing the playback speed under a certain pitch condition different from the recorded pitch" will be explained.

The condition that a pitch is constant, which is different from the recorded pitch, satisfies equation (16) by substituting the pitch as M into equation (9).

Equation (16) is transformed into Equation (16).

That is, the playback speed can be changed by controlling the playback speed of the recording/playback device 2 with the first output C3 of the playback speed pitch conversion control circuit 7, but in this case, the pitch conversion ratio of the pitch conversion circuit 4 is , is inversely proportional to the pitch conversion ratio under conditions of a playback speed different from the recording speed of the recording/playback device 2, and is related to the pitch conversion ratio under a certain pitch constant condition different from the recorded pitch.

FIG. 2 shows another embodiment of the invention.

In the embodiment shown in FIG. 11, the reproducing device is, for example, a recording/reproducing device such as a tape deck or a video deck.
In FIG. 2, for example, a compact disc player, V
The difference is that it is a playback device 8 such as an HD. The effects of the embodiment shown in FIG. 1 and the other embodiment shown in FIG. 2 do not change at all.

Effects of the Invention According to the present invention, it is possible to provide a device that can set any pitch at any playback speed, so when a so-called karaoke machine cannot sing fast, the playback speed is slowed down and the pitch is set to any pitch. It has the advantage of being able to practice at an easy pitch, and 1.
If you don't have a lot of time and want to listen faster, you can increase the playback speed to any desired pitch.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a reproducing apparatus according to one embodiment of the present invention, FIG. 2 is a block diagram showing another embodiment, and FIG. 3 is a block diagram showing a conventional example. 1... Input terminal, 2... Recording/playback device, 4... Pitch conversion circuit, 6... Output terminal, 7... Playback Speed pitch conversion control circuit, 8...
...Playback device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] A playback device that can change the playback speed, a pitch conversion device that receives an output signal from the playback device and can control the frequency of the output signal with respect to the frequency of the input signal, and a pitch converter that controls the playback speed of the playback device. circuit means for outputting a first signal and a second signal for controlling the pitch of the pitch converting device; The relationship between the pitch change rate and the second pitch change rate obtained by controlling the pitch converter using the second output signal of the circuit means is set to a value determined by the desired playback speed and pitch. A playback device comprising a logic circuit.